Value: add javadoc

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

@@ -1,12 +1,45 @@
+/**
+ * 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;
 
 /**
+ * A Value from an if-then-else in a functional-style.
+ *
+ * @param <T> the type of the value
+ *
  * @author Paul Campbell (pcampbell@kemitix.net).
  */
 public interface Value<T> {
 
+    /**
+     * Create a new {@link ValueClause} for the clause.
+     *
+     * @param clause the condition to test
+     * @param <T>    the type of the value
+     *
+     * @return a true or false value clause
+     */
     static <T> ValueClause<T> where(final boolean clause) {
         if (clause) {
             return new TrueValueClause<>();
@@ -14,34 +47,99 @@ public interface Value<T> {
         return new FalseValueClause<>();
     }
 
+    /**
+     * Create a new {@link ValueClause} for the boolean opposite of the clause.
+     *
+     * @param clause the condition to test
+     * @param <T>    the type of the value
+     *
+     * @return a true or false value clause
+     */
     static <T> ValueClause<T> whereNot(boolean clause) {
         return where(!clause);
     }
 
+    /**
+     * An intermediate state in determining the final {@link Value}.
+     *
+     * @param <T> the type of the value
+     */
     interface ValueClause<T> {
 
+        /**
+         * Create a {@link ValueSupplier} with the {@link Supplier} should the {@link ValueClause} be true.
+         *
+         * @param trueSupplier the Supplier for the true value
+         *
+         * @return the value supplier
+         */
         ValueSupplier<T> then(Supplier<T> trueSupplier);
 
+        /**
+         * Logically AND combine the current {@link ValueClause} with clause.
+         *
+         * @param clause the condition to test
+         *
+         * @return a true or false value clause
+         */
         ValueClause<T> and(boolean clause);
 
+        /**
+         * Logically OR combine the current {@link ValueClause} with clause.
+         *
+         * @param clause the condition to test
+         *
+         * @return a true or false value clause
+         */
         ValueClause<T> or(boolean clause);
 
+        /**
+         * Logically AND combine the current {@link ValueClause} with boolean opposite of the clause.
+         *
+         * @param clause the condition to test
+         *
+         * @return a true or false value clause
+         */
         default ValueClause<T> andNot(final boolean clause) {
             return and(!clause);
         }
 
+        /**
+         * Logically OR combine the current {@link ValueClause} with boolean opposite of the clause.
+         *
+         * @param clause the condition to test
+         *
+         * @return a true or false value clause
+         */
         default ValueClause<T> orNot(boolean clause) {
             return or(!clause);
         }
 
+        /**
+         * An intermediate result of the {@link Value}.
+         *
+         * @param <T> the type of the value
+         */
         interface ValueSupplier<T> {
 
+            /**
+             * Determine the value by whether the {@link ValueClause} was true or false.
+             *
+             * @param falseSupplier the Supplier for the false value
+             *
+             * @return the value
+             */
             T otherwise(Supplier<T> falseSupplier);
 
         }
 
     }
 
+    /**
+     * An intermediate state where the clause has evaluated to true.
+     *
+     * @param <T> the type of the value
+     */
     class TrueValueClause<T> implements ValueClause<T> {
 
         @Override
@@ -59,6 +157,11 @@ public interface Value<T> {
             return this;
         }
 
+        /**
+         * An intermediate result of the {@link Value} where the clause has evaluated to true.
+         *
+         * @param <T> the type of the value
+         */
         private class TrueValueSupplier<T> implements ValueSupplier<T> {
 
             private final Supplier<T> valueSupplier;
@@ -76,6 +179,11 @@ public interface Value<T> {
 
     }
 
+    /**
+     * An intermediate state where the clause has evaluated to false.
+     *
+     * @param <T> the type of the value
+     */
     class FalseValueClause<T> implements ValueClause<T> {
 
         @Override
@@ -93,6 +201,11 @@ public interface Value<T> {
             return Value.<T>where(clause);
         }
 
+        /**
+         * An intermediate result of the {@link Value} where the clause has evaluated to false.
+         *
+         * @param <T> the type of the value
+         */
         private class FalseValueSupplier<T> implements ValueSupplier<T> {
 
             @Override