Merge pull request #8 from kemitix/release/0.3.0

Release 0.3.0

.gitmodules

@@ -0,0 +1,3 @@
+[submodule ".travis-support"]
+	path = .travis-support
+	url = https://github.com/kemitix/kemitix-travis-support.git

.mvn/wrapper/maven-wrapper.properties

@@ -0,0 +1 @@
+distributionUrl=https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.5.0/apache-maven-3.5.0-bin.zip

.travis-support

@@ -0,0 +1 @@
+Subproject commit b8593e541ba9a11447fa9559a83e5f99097ca4d2

.travis.yml

@@ -1,5 +1,18 @@
 language: java
 jdk:
-    - oraclejdk8
+- oraclejdk8
+cache:
+  directories:
+  - "$HOME/.m2"
+install: true
+script: "./mvnw clean install"
 after_success:
-    - mvn clean test jacoco:report coveralls:report
+- sh .travis-support/coveralls.sh
+- bash <(curl -s https://codecov.io/bash)
+deploy:
+  provider: script
+  script: sh .travis-support/deploy.sh
+  on:
+    branch: master
+env:
+  global:

CHANGELOG

@@ -0,0 +1,28 @@
+CHANGELOG
+=========
+
+0.3.0
+-----
+
+* Add `<T> Value.where(boolean, Supplier<T>, Supplier<T>)`
+* Add `Optional<T> Value.where(boolean, Supplier<T>)`
+* Add `.travis-support`
+* Avoid danger of JVM-level deadlock during `Value` initialisation
+* Avoid danger of JVM-level deadlock during `Condition` initialisation
+* Upgrade `kemitix-parent` to 3.2.0
+* Upgrade `kemitix-checkstyle-parent` to 3.2.0
+* Upgrade `assertj` to 3.8.0
+* Set `jacoco` to 100% line and instruction coverage required
+* Set `pitest` to 100% mutation and coverage required
+* Use `lombok.val` in `ValueTest`
+* Move `assertThat` calls to individual test methods in `ValueTest`
+
+0.2.0
+-----
+
+* Added `Value`
+
+0.1.0
+-----
+
+* Initial release

README.adoc

@@ -1,11 +1,12 @@
 # Conditional
 
+image:https://img.shields.io/github/release/kemitix/conditional.svg["Releases", link="https://github.com/kemitix/conditional/releases"]
+image:https://api.codacy.com/project/badge/Grade/1188742d676e457da91415d2b3a5faf1["Codacy code quality", link="https://www.codacy.com/app/kemitix/conditional"]
 image:https://travis-ci.org/kemitix/conditional.svg?branch=master["Build Status", link="https://travis-ci.org/kemitix/conditional"]
+image:https://coveralls.io/repos/github/kemitix/conditional/badge.svg?branch=master["Coverage Status", link="https://coveralls.io/github/kemitix/conditional?branch=master"]
 
-image::https://coveralls.io/repos/github/kemitix/conditional/badge.svg?branch=master["Coverage Status", link="https://coveralls.io/github/kemitix/conditional?branch=master"]
+* link:#condition[Condition]
-
+* link:#value[Value]
-* link:#_condition[Condition]
-* link:#_value[Value]
 
 ## Condition
 
@@ -200,6 +201,16 @@ if (isTrue()) {
 String result = isTrue() ? TRUE : FALSE;
 ----
 
+[[source,java]]
+----
+final String result = Value.where(isTrue(), () -> TRUE, () -> FALSE);
+----
+
+[[source,java]]
+----
+final Optional<String> result = Value.where(isTrue(), () -> TRUE);
+----
+
 [[source,java]]
 ----
 final String result = Value.<String>where(isTrue()).then(() -> TRUE)

circle.yml

@@ -0,0 +1,3 @@
+test:
+  override:
+  - ./mvnw clean install

mvnw

@@ -0,0 +1,236 @@
+#!/bin/sh
+# ----------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Maven2 Start Up Batch script
+#
+# Required ENV vars:
+# ------------------
+#   JAVA_HOME - location of a JDK home dir
+#
+# Optional ENV vars
+# -----------------
+#   M2_HOME - location of maven2's installed home dir
+#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
+#     e.g. to debug Maven itself, use
+#       set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+#   MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+# ----------------------------------------------------------------------------
+
+if [ -z "$MAVEN_SKIP_RC" ] ; then
+
+  if [ -f /etc/mavenrc ] ; then
+    . /etc/mavenrc
+  fi
+
+  if [ -f "$HOME/.mavenrc" ] ; then
+    . "$HOME/.mavenrc"
+  fi
+
+fi
+
+# OS specific support.  $var _must_ be set to either true or false.
+cygwin=false;
+darwin=false;
+mingw=false
+case "`uname`" in
+  CYGWIN*) cygwin=true ;;
+  MINGW*) mingw=true;;
+  Darwin*) darwin=true
+           #
+           # Look for the Apple JDKs first to preserve the existing behaviour, and then look
+           # for the new JDKs provided by Oracle.
+           #
+           if [ -z "$JAVA_HOME" ] && [ -L /System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK ] ; then
+             #
+             # Apple JDKs
+             #
+             export JAVA_HOME=/System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Home
+           fi
+
+           if [ -z "$JAVA_HOME" ] && [ -L /System/Library/Java/JavaVirtualMachines/CurrentJDK ] ; then
+             #
+             # Apple JDKs
+             #
+             export JAVA_HOME=/System/Library/Java/JavaVirtualMachines/CurrentJDK/Contents/Home
+           fi
+
+           if [ -z "$JAVA_HOME" ] && [ -L "/Library/Java/JavaVirtualMachines/CurrentJDK" ] ; then
+             #
+             # Oracle JDKs
+             #
+             export JAVA_HOME=/Library/Java/JavaVirtualMachines/CurrentJDK/Contents/Home
+           fi
+
+           if [ -z "$JAVA_HOME" ] && [ -x "/usr/libexec/java_home" ]; then
+             #
+             # Apple JDKs
+             #
+             export JAVA_HOME=`/usr/libexec/java_home`
+           fi
+           ;;
+esac
+
+if [ -z "$JAVA_HOME" ] ; then
+  if [ -r /etc/gentoo-release ] ; then
+    JAVA_HOME=`java-config --jre-home`
+  fi
+fi
+
+if [ -z "$M2_HOME" ] ; then
+  ## resolve links - $0 may be a link to maven's home
+  PRG="$0"
+
+  # need this for relative symlinks
+  while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+      PRG="$link"
+    else
+      PRG="`dirname "$PRG"`/$link"
+    fi
+  done
+
+  saveddir=`pwd`
+
+  M2_HOME=`dirname "$PRG"`/..
+
+  # make it fully qualified
+  M2_HOME=`cd "$M2_HOME" && pwd`
+
+  cd "$saveddir"
+  # echo Using m2 at $M2_HOME
+fi
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched
+if $cygwin ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --unix "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
+fi
+
+# For Migwn, ensure paths are in UNIX format before anything is touched
+if $mingw ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME="`(cd "$M2_HOME"; pwd)`"
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
+  # TODO classpath?
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+  javaExecutable="`which javac`"
+  if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
+    # readlink(1) is not available as standard on Solaris 10.
+    readLink=`which readlink`
+    if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
+      if $darwin ; then
+        javaHome="`dirname \"$javaExecutable\"`"
+        javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
+      else
+        javaExecutable="`readlink -f \"$javaExecutable\"`"
+      fi
+      javaHome="`dirname \"$javaExecutable\"`"
+      javaHome=`expr "$javaHome" : '\(.*\)/bin'`
+      JAVA_HOME="$javaHome"
+      export JAVA_HOME
+    fi
+  fi
+fi
+
+if [ -z "$JAVACMD" ] ; then
+  if [ -n "$JAVA_HOME"  ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+      # IBM's JDK on AIX uses strange locations for the executables
+      JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+      JAVACMD="$JAVA_HOME/bin/java"
+    fi
+  else
+    JAVACMD="`which java`"
+  fi
+fi
+
+if [ ! -x "$JAVACMD" ] ; then
+  echo "Error: JAVA_HOME is not defined correctly." >&2
+  echo "  We cannot execute $JAVACMD" >&2
+  exit 1
+fi
+
+if [ -z "$JAVA_HOME" ] ; then
+  echo "Warning: JAVA_HOME environment variable is not set."
+fi
+
+CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
+
+# traverses directory structure from process work directory to filesystem root
+# first directory with .mvn subdirectory is considered project base directory
+find_maven_basedir() {
+  local basedir=$(pwd)
+  local wdir=$(pwd)
+  while [ "$wdir" != '/' ] ; do
+    if [ -d "$wdir"/.mvn ] ; then
+      basedir=$wdir
+      break
+    fi
+    wdir=$(cd "$wdir/.."; pwd)
+  done
+  echo "${basedir}"
+}
+
+# concatenates all lines of a file
+concat_lines() {
+  if [ -f "$1" ]; then
+    echo "$(tr -s '\n' ' ' < "$1")"
+  fi
+}
+
+export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-$(find_maven_basedir)}
+MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --path --windows "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
+  [ -n "$MAVEN_PROJECTBASEDIR" ] &&
+    MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"`
+fi
+
+# Provide a "standardized" way to retrieve the CLI args that will
+# work with both Windows and non-Windows executions.
+MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@"
+export MAVEN_CMD_LINE_ARGS
+
+WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+# avoid using MAVEN_CMD_LINE_ARGS below since that would loose parameter escaping in $@
+exec "$JAVACMD" \
+  $MAVEN_OPTS \
+  -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
+  "-Dmaven.home=${M2_HOME}" "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
+  ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"

mvnw.cmd

@@ -0,0 +1,146 @@
+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    http://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Maven2 Start Up Batch script
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM M2_HOME - location of maven2's installed home dir
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a key stroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM enable echoing my setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%HOME%\mavenrc_pre.bat" call "%HOME%\mavenrc_pre.bat"
+if exist "%HOME%\mavenrc_pre.cmd" call "%HOME%\mavenrc_pre.cmd"
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+set MAVEN_CMD_LINE_ARGS=%MAVEN_CONFIG% %*
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+
+set WRAPPER_JAR=""%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar""
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+# avoid using MAVEN_CMD_LINE_ARGS below since that would loose parameter escaping in %*
+%MAVEN_JAVA_EXE% %JVM_CONFIG_MAVEN_PROPS% %MAVEN_OPTS% %MAVEN_DEBUG_OPTS% -classpath %WRAPPER_JAR% "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%HOME%\mavenrc_post.bat" call "%HOME%\mavenrc_post.bat"
+if exist "%HOME%\mavenrc_post.cmd" call "%HOME%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%" == "on" pause
+
+if "%MAVEN_TERMINATE_CMD%" == "on" exit %ERROR_CODE%
+
+exit /B %ERROR_CODE%

pom.xml

@@ -4,21 +4,26 @@
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <properties>
-        <kemitix-checkstyle-ruleset.version>2.3.0</kemitix-checkstyle-ruleset.version>
+        <kemitix-checkstyle-ruleset.version>3.2.0</kemitix-checkstyle-ruleset.version>
         <kemitix-checkstyle-ruleset.level>5-complexity</kemitix-checkstyle-ruleset.level>
+        <jacoco-class-line-covered-ratio>1</jacoco-class-line-covered-ratio>
+        <jacoco-class-instruction-covered-ratio>1</jacoco-class-instruction-covered-ratio>
+        <jacoco-class-missed-count-maximum>0</jacoco-class-missed-count-maximum>
+        <pitest.coverage>100</pitest.coverage>
+        <pitest.mutation>100</pitest.mutation>
         <junit.version>4.12</junit.version>
-        <assertj.version>3.6.2</assertj.version>
+        <assertj.version>3.8.0</assertj.version>
         <coveralls-maven-plugin.version>4.3.0</coveralls-maven-plugin.version>
     </properties>
 
     <parent>
     <groupId>net.kemitix</groupId>
         <artifactId>kemitix-parent</artifactId>
-        <version>2.7.0</version>
+        <version>3.2.0</version>
         <relativePath/>
     </parent>
     <artifactId>conditional</artifactId>
-    <version>0.2.0</version>
+    <version>0.3.0</version>
 
     <dependencies>
         <dependency>
@@ -41,11 +46,14 @@
                 <groupId>net.kemitix</groupId>
                 <artifactId>kemitix-checkstyle-ruleset-maven-plugin</artifactId>
                 <version>${kemitix-checkstyle-ruleset.version}</version>
+                <configuration>
+                    <level>${kemitix-checkstyle-ruleset.level}</level>
+                </configuration>
                 <executions>
                     <execution>
                         <phase>validate</phase>
                         <goals>
-                            <goal>${kemitix-checkstyle-ruleset.level}</goal>
+                            <goal>check</goal>
                         </goals>
                     </execution>
                 </executions>
@@ -57,12 +65,4 @@
             </plugin>
         </plugins>
     </build>
-
-    <pluginRepositories>
-        <pluginRepository>
-            <id>sevntu-maven</id>
-            <name>sevntu-maven</name>
-            <url>http://sevntu-checkstyle.github.io/sevntu.checkstyle/maven2</url>
-        </pluginRepository>
-    </pluginRepositories>
 </project>

src/main/java/net/kemitix/conditional/Condition.java

@@ -21,12 +21,6 @@
 
 package net.kemitix.conditional;
 
-import java.util.AbstractMap.SimpleEntry;
-import java.util.Collections;
-import java.util.Map;
-import java.util.stream.Collectors;
-import java.util.stream.Stream;
-
 /**
  * If-then-else in a functional-style.
  *
@@ -34,14 +28,6 @@ import java.util.stream.Stream;
  */
 public interface Condition {
 
-    Condition TRUE = new TrueCondition();
-
-    Condition FALSE = new FalseCondition();
-
-    Map<Boolean, Condition> CONDITIONS = Collections.unmodifiableMap(
-            Stream.of(new SimpleEntry<>(true, TRUE), new SimpleEntry<>(false, FALSE))
-                  .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue)));
-
     /**
      * Create a new {@code Condition} for the clause.
      *
@@ -49,8 +35,9 @@ public interface Condition {
      *
      * @return the Condition
      */
+    @SuppressWarnings("avoidinlineconditionals")
     static Condition where(final boolean clause) {
-        return CONDITIONS.get(clause);
+        return clause ? TrueCondition.TRUE : FalseCondition.FALSE;
     }
 
     /**
@@ -131,58 +118,4 @@ public interface Condition {
         return where(clause);
     }
 
-    /**
-     * A {@code Condition} that has evaluated to {@code true}.
-     */
-    class TrueCondition implements Condition {
-
-        @Override
-        public Condition and(final boolean clause) {
-            return where(clause);
-        }
-
-        @Override
-        public Condition or(final boolean secondClause) {
-            return TRUE;
-        }
-
-        @Override
-        public Condition then(final Runnable response) {
-            response.run();
-            return TRUE;
-        }
-
-        @Override
-        public void otherwise(final Runnable response) {
-        }
-
-    }
-
-    /**
-     * A {@code Condition} that has evaluated to {@code false}.
-     */
-    class FalseCondition implements Condition {
-
-        @Override
-        public Condition and(final boolean clause) {
-            return FALSE;
-        }
-
-        @Override
-        public Condition or(final boolean secondClause) {
-            return where(secondClause);
-        }
-
-        @Override
-        public Condition then(final Runnable response) {
-            return FALSE;
-        }
-
-        @Override
-        public void otherwise(final Runnable response) {
-            response.run();
-        }
-
-    }
-
 }

src/main/java/net/kemitix/conditional/FalseCondition.java

@@ -0,0 +1,53 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Paul Campbell
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ * and associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies
+ * or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
+ * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+package net.kemitix.conditional;
+
+/**
+ * A {@code Condition} that has evaluated to {@code false}.
+ *
+ * @author Paul Campbell (pcampbell@kemitix.net).
+ */
+final class FalseCondition implements Condition {
+
+    protected static final Condition FALSE = new net.kemitix.conditional.FalseCondition();
+
+    @Override
+    public Condition and(final boolean clause) {
+        return FALSE;
+    }
+
+    @Override
+    public Condition or(final boolean secondClause) {
+        return Condition.where(secondClause);
+    }
+
+    @Override
+    public Condition then(final Runnable response) {
+        return FALSE;
+    }
+
+    @Override
+    public void otherwise(final Runnable response) {
+        response.run();
+    }
+
+}

src/main/java/net/kemitix/conditional/FalseValueClause.java

@@ -0,0 +1,64 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Paul Campbell
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ * and associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies
+ * or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
+ * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+package net.kemitix.conditional;
+
+import java.util.function.Supplier;
+
+/**
+ * An intermediate state where the clause has evaluated to false.
+ *
+ * @param <T> the type of the value
+ *
+ * @author Paul Campbell (pcampbell@kemitix.net).
+ */
+class FalseValueClause<T> implements Value.ValueClause<T> {
+
+    protected static final Value.ValueClause FALSE = new FalseValueClause();
+
+    @Override
+    public ValueSupplier<T> then(final Supplier<T> trueSupplier) {
+        return new FalseValueSupplier();
+    }
+
+    @Override
+    public Value.ValueClause<T> and(final boolean clause) {
+        return this;
+    }
+
+    @Override
+    public Value.ValueClause<T> or(final boolean clause) {
+        return Value.where(clause);
+    }
+
+    /**
+     * An intermediate result of the {@link Value} where the clause has evaluated to false.
+     */
+    private class FalseValueSupplier implements ValueSupplier<T> {
+
+        @Override
+        public T otherwise(final Supplier<T> falseSupplier) {
+            return falseSupplier.get();
+        }
+
+    }
+
+}

src/main/java/net/kemitix/conditional/TrueCondition.java

@@ -0,0 +1,54 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Paul Campbell
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ * and associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies
+ * or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
+ * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+package net.kemitix.conditional;
+
+/**
+ * A {@code Condition} that has evaluated to {@code true}.
+ *
+ * @author Paul Campbell (pcampbell@kemitix.net).
+ */
+final class TrueCondition implements Condition {
+
+    protected static final Condition TRUE = new net.kemitix.conditional.TrueCondition();
+
+    @Override
+    public Condition and(final boolean clause) {
+        return Condition.where(clause);
+    }
+
+    @Override
+    public Condition or(final boolean secondClause) {
+        return TRUE;
+    }
+
+    @Override
+    public Condition then(final Runnable response) {
+        response.run();
+        return TRUE;
+    }
+
+    @Override
+    public void otherwise(final Runnable response) {
+        // do nothing
+    }
+
+}

src/main/java/net/kemitix/conditional/TrueValueClause.java

@@ -0,0 +1,69 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Paul Campbell
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ * and associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies
+ * or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
+ * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+package net.kemitix.conditional;
+
+import lombok.RequiredArgsConstructor;
+
+import java.util.function.Supplier;
+
+/**
+ * An intermediate state where the clause has evaluated to true.
+ *
+ * @param <T> the type of the value
+ *
+ * @author Paul Campbell (pcampbell@kemitix.net).
+ */
+class TrueValueClause<T> implements Value.ValueClause<T> {
+
+    protected static final Value.ValueClause TRUE = new TrueValueClause();
+
+    @Override
+    public ValueSupplier<T> then(final Supplier<T> trueSupplier) {
+        return new TrueValueSupplier(trueSupplier);
+    }
+
+    @Override
+    public Value.ValueClause<T> and(final boolean clause) {
+        return Value.where(clause);
+    }
+
+    @Override
+    public Value.ValueClause<T> or(final boolean clause) {
+        return this;
+    }
+
+    /**
+     * An intermediate result of the {@link Value} where the clause has evaluated to true.
+     */
+    @RequiredArgsConstructor
+    private class TrueValueSupplier implements ValueSupplier<T> {
+
+        private final Supplier<T> valueSupplier;
+
+        @Override
+        public T otherwise(final Supplier<T> falseSupplier) {
+            return valueSupplier.get();
+        }
+
+    }
+
+}

src/main/java/net/kemitix/conditional/Value.java

@@ -21,6 +21,7 @@
 
 package net.kemitix.conditional;
 
+import java.util.Optional;
 import java.util.function.Supplier;
 
 /**
@@ -30,6 +31,41 @@ import java.util.function.Supplier;
  */
 public interface Value {
 
+    /**
+     * Return one of two values depending on the value of a clause.
+     *
+     * @param clause        The deciding clause
+     * @param trueSupplier  The supplier to provide the value when the clause is true
+     * @param falseSupplier The supplier to provide the value when the clause is false
+     * @param <T>           The type of the value
+     *
+     * @return the value from either the trueSupplier or the falseSupplier
+     */
+    static <T> T where(
+            boolean clause,
+            Supplier<T> trueSupplier,
+            Supplier<T> falseSupplier
+                      ) {
+        return Value.<T>where(clause).then(trueSupplier)
+                                     .otherwise(falseSupplier);
+    }
+
+    /**
+     * Return an Optional either containing a value, if the clause is true, or empty.
+     *
+     * @param clause        The deciding clause
+     * @param trueSupplier  The supplier to provide the value when the clause is true
+     * @param <T>           The type of the value
+     *
+     * @return an Optional either containing the value from the trueSupplier or empty
+     */
+    static <T> Optional<T> where(
+            boolean clause,
+            Supplier<T> trueSupplier
+                                ) {
+        return Optional.ofNullable(Value.where(clause, trueSupplier, () -> null));
+    }
+
     /**
      * Create a new {@link ValueClause} for the clause.
      *
@@ -38,11 +74,9 @@ public interface Value {
      *
      * @return a true or false value clause
      */
+    @SuppressWarnings({"unchecked", "avoidinlineconditionals"})
     static <T> ValueClause<T> where(final boolean clause) {
-        if (clause) {
+        return (ValueClause<T>) (clause ? TrueValueClause.TRUE : FalseValueClause.FALSE);
-            return new TrueValueClause<>();
-        }
-        return new FalseValueClause<>();
     }
 
     /**
@@ -133,82 +167,4 @@ public interface Value {
 
     }
 
-    /**
-     * An intermediate state where the clause has evaluated to true.
-     *
-     * @param <T> the type of the value
-     */
-    class TrueValueClause<T> implements ValueClause<T> {
-
-        @Override
-        public ValueSupplier<T> then(final Supplier<T> trueSupplier) {
-            return new TrueValueSupplier(trueSupplier);
-        }
-
-        @Override
-        public ValueClause<T> and(final boolean clause) {
-            return Value.where(clause);
-        }
-
-        @Override
-        public ValueClause<T> or(final boolean clause) {
-            return this;
-        }
-
-        /**
-         * An intermediate result of the {@link Value} where the clause has evaluated to true.
-         */
-        private class TrueValueSupplier implements ValueSupplier<T> {
-
-            private final Supplier<T> valueSupplier;
-
-            TrueValueSupplier(final Supplier<T> valueSupplier) {
-                this.valueSupplier = valueSupplier;
-            }
-
-            @Override
-            public T otherwise(final Supplier<T> falseSupplier) {
-                return valueSupplier.get();
-            }
-
-        }
-
-    }
-
-    /**
-     * An intermediate state where the clause has evaluated to false.
-     *
-     * @param <T> the type of the value
-     */
-    class FalseValueClause<T> implements ValueClause<T> {
-
-        @Override
-        public ValueSupplier<T> then(final Supplier<T> trueSupplier) {
-            return new FalseValueSupplier();
-        }
-
-        @Override
-        public ValueClause<T> and(final boolean clause) {
-            return this;
-        }
-
-        @Override
-        public ValueClause<T> or(final boolean clause) {
-            return Value.where(clause);
-        }
-
-        /**
-         * An intermediate result of the {@link Value} where the clause has evaluated to false.
-         */
-        private class FalseValueSupplier implements ValueSupplier<T> {
-
-            @Override
-            public T otherwise(final Supplier<T> falseSupplier) {
-                return falseSupplier.get();
-            }
-
-        }
-
-    }
-
 }

src/test/java/net/kemitix/conditional/ConditionalTest.java

@@ -29,7 +29,7 @@ public class ConditionalTest {
         //when
         when(true);
         //then
-        thenTheThenResponseRuns();
+        assertThatTheThenResponseRuns();
     }
 
     @Test
@@ -37,7 +37,7 @@ public class ConditionalTest {
         //when
         when(false);
         //then
-        thenTheOtherwiseResponseRuns();
+        assertThatTheOtherwiseResponseRuns();
     }
 
     @Test
@@ -45,7 +45,7 @@ public class ConditionalTest {
         //when
         when(true, true);
         //then
-        thenTheThenResponseRuns();
+        assertThatTheThenResponseRuns();
     }
 
     @Test
@@ -53,7 +53,7 @@ public class ConditionalTest {
         //when
         when(true, false);
         //then
-        thenTheOtherwiseResponseRuns();
+        assertThatTheOtherwiseResponseRuns();
     }
 
     @Test
@@ -61,7 +61,7 @@ public class ConditionalTest {
         //when
         when(false, true);
         //then
-        thenTheOtherwiseResponseRuns();
+        assertThatTheOtherwiseResponseRuns();
     }
 
     @Test
@@ -69,7 +69,7 @@ public class ConditionalTest {
         //when
         when(false, false);
         //then
-        thenTheOtherwiseResponseRuns();
+        assertThatTheOtherwiseResponseRuns();
     }
 
     @Test
@@ -80,7 +80,7 @@ public class ConditionalTest {
                  .and(true)
                  .then(otherwiseResponse);
         //then
-        thenBothResponsesRun();
+        assertThatBothResponsesRun();
     }
 
     @Test
@@ -88,7 +88,7 @@ public class ConditionalTest {
         //when
         whenOr(true, true);
         //then
-        thenTheThenResponseRuns();
+        assertThatTheThenResponseRuns();
     }
 
     @Test
@@ -96,7 +96,7 @@ public class ConditionalTest {
         //when
         whenOr(true, false);
         //then
-        thenTheThenResponseRuns();
+        assertThatTheThenResponseRuns();
     }
 
     @Test
@@ -104,7 +104,7 @@ public class ConditionalTest {
         //when
         whenOr(false, true);
         //then
-        thenTheThenResponseRuns();
+        assertThatTheThenResponseRuns();
     }
 
     @Test
@@ -112,7 +112,7 @@ public class ConditionalTest {
         //when
         whenOr(false, false);
         //then
-        thenTheOtherwiseResponseRuns();
+        assertThatTheOtherwiseResponseRuns();
     }
 
     @Test
@@ -121,7 +121,7 @@ public class ConditionalTest {
         Condition.whereNot(false)
                  .then(thenResponse);
         //then
-        thenTheThenResponseRuns();
+        assertThatTheThenResponseRuns();
     }
 
     @Test
@@ -131,7 +131,7 @@ public class ConditionalTest {
                  .then(thenResponse)
                  .otherwise(otherwiseResponse);
         //then
-        thenTheOtherwiseResponseRuns();
+        assertThatTheOtherwiseResponseRuns();
     }
 
     @Test
@@ -141,7 +141,7 @@ public class ConditionalTest {
                  .andNot(false)
                  .then(thenResponse);
         //then
-        thenTheThenResponseRuns();
+        assertThatTheThenResponseRuns();
     }
 
     @Test
@@ -152,7 +152,7 @@ public class ConditionalTest {
                  .then(thenResponse)
                  .otherwise(otherwiseResponse);
         //then
-        thenTheOtherwiseResponseRuns();
+        assertThatTheOtherwiseResponseRuns();
     }
 
     @Test
@@ -162,7 +162,7 @@ public class ConditionalTest {
                  .orNot(false)
                  .then(thenResponse);
         //then
-        thenTheThenResponseRuns();
+        assertThatTheThenResponseRuns();
     }
 
     @Test
@@ -173,7 +173,7 @@ public class ConditionalTest {
                  .then(thenResponse)
                  .otherwise(otherwiseResponse);
         //then
-        thenTheOtherwiseResponseRuns();
+        assertThatTheOtherwiseResponseRuns();
     }
 
     @Test
@@ -184,7 +184,7 @@ public class ConditionalTest {
                  .otherwise(true)
                  .then(otherwiseResponse);
         //then
-        thenTheOtherwiseResponseRuns();
+        assertThatTheOtherwiseResponseRuns();
     }
 
     @Test
@@ -195,7 +195,7 @@ public class ConditionalTest {
                  .otherwise(false)
                  .then(otherwiseResponse);
         //then
-        thenNoResponseRuns();
+        assertThatNoResponseRuns();
     }
 
     @Test
@@ -205,7 +205,7 @@ public class ConditionalTest {
                  .then(thenResponse)
                  .then(otherwiseResponse);
         //then
-        thenBothResponsesRun();
+        assertThatBothResponsesRun();
     }
 
     @Test
@@ -215,14 +215,47 @@ public class ConditionalTest {
                  .then(thenResponse)
                  .then(otherwiseResponse);
         //then
-        thenNoResponseRuns();
+        assertThatNoResponseRuns();
     }
 
-    private void whenOr(final boolean firstClause, final boolean secondClause) {
+    private void assertThatBothResponsesRun() {
-        Condition.where(firstClause)
+        assertThatTheThenResponseRan();
-                 .or(secondClause)
+        assertThatTheOtherwiseResponseRan();
-                 .then(thenResponse)
+    }
-                 .otherwise(otherwiseResponse);
+
+    private void assertThatTheThenResponseRuns() {
+        assertThatTheThenResponseRan();
+        assertThatTheOtherwiseResponseDidNotRun();
+    }
+
+    private void assertThatTheOtherwiseResponseRuns() {
+        assertThatTheThenResponseDidNotRun();
+        assertThatTheOtherwiseResponseRan();
+    }
+
+    private void assertThatTheOtherwiseResponseRan() {
+        assertThat(otherwiseFlag).as("otherwise response runs")
+                                 .isTrue();
+    }
+
+    private void assertThatTheThenResponseRan() {
+        assertThat(thenFlag).as("then response runs")
+                            .isTrue();
+    }
+
+    private void assertThatTheOtherwiseResponseDidNotRun() {
+        assertThat(otherwiseFlag).as("otherwise response does not run")
+                                 .isFalse();
+    }
+
+    private void assertThatTheThenResponseDidNotRun() {
+        assertThat(thenFlag).as("then response does not run")
+                            .isFalse();
+    }
+
+    private void assertThatNoResponseRuns() {
+        assertThatTheThenResponseDidNotRun();
+        assertThatTheOtherwiseResponseDidNotRun();
     }
 
     private void when(final boolean clause) {
@@ -231,51 +264,23 @@ public class ConditionalTest {
                  .otherwise(otherwiseResponse);
     }
 
-    private void thenBothResponsesRun() {
+    private void when(
-        theThenResponseRan();
+            final boolean firstClause,
-        theOtherwiseResponseRan();
+            final boolean secondClause
-    }
+                     ) {
-
-    private void thenTheThenResponseRuns() {
-        theThenResponseRan();
-        theOtherwiseResponseDidNotRun();
-    }
-
-    private void thenTheOtherwiseResponseRuns() {
-        theThenResponseDidNotRun();
-        theOtherwiseResponseRan();
-    }
-
-    private void theOtherwiseResponseRan() {
-        assertThat(otherwiseFlag).as("otherwise response runs")
-                                 .isTrue();
-    }
-
-    private void theThenResponseRan() {
-        assertThat(thenFlag).as("then response runs")
-                            .isTrue();
-    }
-
-    private void theOtherwiseResponseDidNotRun() {
-        assertThat(otherwiseFlag).as("otherwise response does not run")
-                                 .isFalse();
-    }
-
-    private void theThenResponseDidNotRun() {
-        assertThat(thenFlag).as("then response does not run")
-                            .isFalse();
-    }
-
-    private void thenNoResponseRuns() {
-        theThenResponseDidNotRun();
-        theOtherwiseResponseDidNotRun();
-    }
-
-    private void when(final boolean firstClause, final boolean secondClause) {
         Condition.where(firstClause)
                  .and(secondClause)
                  .then(thenResponse)
                  .otherwise(otherwiseResponse);
     }
 
+    private void whenOr(
+            final boolean firstClause,
+            final boolean secondClause
+                       ) {
+        Condition.where(firstClause)
+                 .or(secondClause)
+                 .then(thenResponse)
+                 .otherwise(otherwiseResponse);
+    }
 }

src/test/java/net/kemitix/conditional/ValueTest.java

@@ -1,7 +1,10 @@
 package net.kemitix.conditional;
 
+import lombok.val;
 import org.junit.Test;
 
+import java.util.Optional;
+
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
@@ -14,207 +17,230 @@ public class ValueTest {
     private static final String FALSE = "false";
 
     @Test
-    public void valueWhereTrueIsTrue() {
+    public void valueWhereClauseIsTrueTypeSafe() {
         //when
-        final String result = Value.<String>where(true).then(() -> TRUE)
+        final String result = Value.where(true, () -> TRUE, () -> FALSE);
-                                                       .otherwise(() -> FALSE);
         //then
-        thenIsTrue(result);
+        assertThat(result).isEqualTo(TRUE);
     }
 
     @Test
-    public void valueWhereFalseIsFalse() {
+    public void valueWhereClauseIsFalseTypeSafe() {
         //when
-        final String result = Value.<String>where(false).then(() -> TRUE)
+        final String result = Value.where(false, () -> TRUE, () -> FALSE);
+        //then
+        assertThat(result).isEqualTo(FALSE);
+    }
+
+    @Test
+    public void valueWhereClauseIsTrueIsOptional() {
+        //when
+        final Optional<String> result = Value.where(true, () -> TRUE);
+        //then
+        assertThat(result).contains(TRUE);
+    }
+
+    @Test
+    public void valueWhereClauseIsFalseIsEmptyOptional() {
+        //when
+        final Optional<String> result = Value.where(false, () -> TRUE);
+        //then
+        assertThat(result).isEmpty();
+    }
+
+    @Test
+    public void valueWhereClauseIsTrue() {
+        //when
+        val result = Value.<String>where(true).then(() -> TRUE)
                                               .otherwise(() -> FALSE);
         //then
-        thenIsFalse(result);
+        assertThat(result).isEqualTo(TRUE);
+    }
+
+    @Test
+    public void valueWhereClauseIsFalse() {
+        //when
+        val result = Value.<String>where(false).then(() -> TRUE)
+                                               .otherwise(() -> FALSE);
+        //then
+        assertThat(result).isEqualTo(FALSE);
     }
 
     @Test
     public void valueWhereTrueAndTrueIsTrue() {
         //when
-        final String result = Value.<String>where(true).and(true)
+        val result = Value.<String>where(true).and(true)
                                               .then(() -> TRUE)
                                               .otherwise(() -> FALSE);
         //then
-        thenIsTrue(result);
+        assertThat(result).isEqualTo(TRUE);
     }
 
     @Test
     public void valueWhereTrueAndFalseIsFalse() {
         //when
-        final String result = Value.<String>where(true).and(false)
+        val result = Value.<String>where(true).and(false)
                                               .then(() -> TRUE)
                                               .otherwise(() -> FALSE);
         //then
-        thenIsFalse(result);
+        assertThat(result).isEqualTo(FALSE);
     }
 
     @Test
     public void valueWhereFalseAndTrueIsFalse() {
         //when
-        final String result = Value.<String>where(false).and(true)
+        val result = Value.<String>where(false).and(true)
                                                .then(() -> TRUE)
                                                .otherwise(() -> FALSE);
         //then
-        thenIsFalse(result);
+        assertThat(result).isEqualTo(FALSE);
     }
 
     @Test
     public void valueWhereFalseAndFalseIsFalse() {
         //when
-        final String result = Value.<String>where(false).and(false)
+        val result = Value.<String>where(false).and(false)
                                                .then(() -> TRUE)
                                                .otherwise(() -> FALSE);
         //then
-        thenIsFalse(result);
+        assertThat(result).isEqualTo(FALSE);
     }
 
     @Test
     public void valueWhereTrueOrTrueIsTrue() {
         //when
-        final String result = Value.<String>where(true).or(true)
+        val result = Value.<String>where(true).or(true)
                                               .then(() -> TRUE)
                                               .otherwise(() -> FALSE);
         //then
-        thenIsTrue(result);
+        assertThat(result).isEqualTo(TRUE);
     }
 
     @Test
     public void valueWhereTrueOrFalseIsTrue() {
         //when
-        final String result = Value.<String>where(true).or(false)
+        val result = Value.<String>where(true).or(false)
                                               .then(() -> TRUE)
                                               .otherwise(() -> FALSE);
         //then
-        thenIsTrue(result);
+        assertThat(result).isEqualTo(TRUE);
     }
 
     @Test
     public void valueWhereFalseOrTrueIsTrue() {
         //when
-        final String result = Value.<String>where(false).or(true)
+        val result = Value.<String>where(false).or(true)
                                                .then(() -> TRUE)
                                                .otherwise(() -> FALSE);
         //then
-        thenIsTrue(result);
+        assertThat(result).isEqualTo(TRUE);
     }
 
     @Test
     public void valueWhereFalseOrFalseIsFalse() {
         //when
-        final String result = Value.<String>where(false).or(false)
+        val result = Value.<String>where(false).or(false)
                                                .then(() -> TRUE)
                                                .otherwise(() -> FALSE);
         //then
-        thenIsFalse(result);
+        assertThat(result).isEqualTo(FALSE);
     }
 
     @Test
     public void valueWhereNotTrueIsFalse() {
         //when
-        final String result = Value.<String>whereNot(true).then(() -> TRUE)
+        val result = Value.<String>whereNot(true).then(() -> TRUE)
                                                  .otherwise(() -> FALSE);
         //then
-        thenIsFalse(result);
+        assertThat(result).isEqualTo(FALSE);
     }
 
     @Test
     public void valueWhereNotFalseIsTrue() {
         //when
-        final String result = Value.<String>whereNot(false).then(() -> TRUE)
+        val result = Value.<String>whereNot(false).then(() -> TRUE)
                                                   .otherwise(() -> FALSE);
         //then
-        thenIsTrue(result);
+        assertThat(result).isEqualTo(TRUE);
     }
 
     @Test
     public void valueWhereTrueAndNotTrueIsFalse() {
         //when
-        final String result = Value.<String>where(true).andNot(true)
+        val result = Value.<String>where(true).andNot(true)
                                               .then(() -> TRUE)
                                               .otherwise(() -> FALSE);
         //then
-        thenIsFalse(result);
+        assertThat(result).isEqualTo(FALSE);
     }
 
     @Test
     public void valueWhereTrueAndNotFalseIsTrue() {
         //when
-        final String result = Value.<String>where(true).andNot(false)
+        val result = Value.<String>where(true).andNot(false)
                                               .then(() -> TRUE)
                                               .otherwise(() -> FALSE);
         //then
-        thenIsTrue(result);
+        assertThat(result).isEqualTo(TRUE);
     }
 
     @Test
     public void valueWhereFalseAndNotTrueIsFalse() {
         //when
-        final String result = Value.<String>where(false).andNot(true)
+        val result = Value.<String>where(false).andNot(true)
                                                .then(() -> TRUE)
                                                .otherwise(() -> FALSE);
         //then
-        thenIsFalse(result);
+        assertThat(result).isEqualTo(FALSE);
     }
 
     @Test
     public void valueWhereFalseAndNotFalseIsFalse() {
         //when
-        final String result = Value.<String>where(false).andNot(false)
+        val result = Value.<String>where(false).andNot(false)
                                                .then(() -> TRUE)
                                                .otherwise(() -> FALSE);
         //then
-        thenIsFalse(result);
+        assertThat(result).isEqualTo(FALSE);
     }
 
     @Test
     public void valueWhereTrueOrNotTrueIsTrue() {
         //when
-        final String result = Value.<String>where(true).orNot(true)
+        val result = Value.<String>where(true).orNot(true)
                                               .then(() -> TRUE)
                                               .otherwise(() -> FALSE);
         //then
-        thenIsTrue(result);
+        assertThat(result).isEqualTo(TRUE);
     }
 
     @Test
     public void valueWhereTrueOrNotFalseIsTrue() {
         //when
-        final String result = Value.<String>where(true).orNot(false)
+        val result = Value.<String>where(true).orNot(false)
                                               .then(() -> TRUE)
                                               .otherwise(() -> FALSE);
         //then
-        thenIsTrue(result);
+        assertThat(result).isEqualTo(TRUE);
     }
 
     @Test
     public void valueWhereFalseOrNotTrueIsFalse() {
         //when
-        final String result = Value.<String>where(false).orNot(true)
+        val result = Value.<String>where(false).orNot(true)
                                                .then(() -> TRUE)
                                                .otherwise(() -> FALSE);
         //then
-        thenIsFalse(result);
+        assertThat(result).isEqualTo(FALSE);
     }
 
     @Test
     public void valueWhereFalseOrNotFalseIsTrue() {
         //when
-        final String result = Value.<String>where(false).orNot(false)
+        val result = Value.<String>where(false).orNot(false)
                                                .then(() -> TRUE)
                                                .otherwise(() -> FALSE);
         //then
-        thenIsTrue(result);
-    }
-
-    private void thenIsFalse(final String result) {
-        assertThat(result).isEqualTo(FALSE);
-    }
-
-    private void thenIsTrue(final String result) {
         assertThat(result).isEqualTo(TRUE);
     }
-
 }

wercker.yml

@@ -0,0 +1,6 @@
+box: maven:3.5.0-jdk-8
+
+build:
+  steps:
+  - xenoterracide/maven:
+    goals: clean install