314 lines
8.8 KiB
Org Mode
314 lines
8.8 KiB
Org Mode
* Conditional
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** Functional Condition and Value.
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[[https://oss.sonatype.org/content/repositories/releases/net/kemitix/conditional][file:https://img.shields.io/nexus/r/https/oss.sonatype.org/net.kemitix/conditional.svg?style=for-the-badge]]
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[[https://search.maven.org/#search%7Cga%7C1%7Cg%3A%22net.kemitix%22%20AND%20a%3A%22conditional%22][file:https://img.shields.io/maven-central/v/net.kemitix/conditional.svg?style=for-the-badge]]
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[[https://sonarcloud.io/dashboard?id=net.kemitix%3Aconditional][file:https://img.shields.io/sonar/https/sonarcloud.io/net.kemitix%3Aconditional/coverage.svg?style=for-the-badge#.svg]]
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[[https://sonarcloud.io/dashboard?id=net.kemitix%3Aconditional][file:https://img.shields.io/sonar/https/sonarcloud.io/net.kemitix%3Aconditional/tech_debt.svg?style=for-the-badge#.svg]]
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[[https://sonarcloud.io/dashboard?id=net.kemitix%3Aconditional][file:https://sonarcloud.io/api/project_badges/measure?project=net.kemitix%3Aconditional&metric=sqale_rating#.svg]]
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[[https://sonarcloud.io/dashboard?id=net.kemitix%3Aconditional][file:https://sonarcloud.io/api/project_badges/measure?project=net.kemitix%3Aconditional&metric=alert_status#.svg]]
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[[https://sonarcloud.io/dashboard?id=net.kemitix%3Aconditional][file:https://sonarcloud.io/api/project_badges/measure?project=net.kemitix%3Aconditional&metric=reliability_rating#.svg]]
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[[https://sonarcloud.io/dashboard?id=net.kemitix%3Aconditional][file:https://sonarcloud.io/api/project_badges/measure?project=net.kemitix%3Aconditional&metric=security_rating#.svg]]
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[[https://sonarcloud.io/dashboard?id=net.kemitix%3Aconditional][file:https://sonarcloud.io/api/project_badges/measure?project=net.kemitix%3Aconditional&metric=sqale_index#.svg]]
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[[https://sonarcloud.io/dashboard?id=net.kemitix%3Aconditional][file:https://sonarcloud.io/api/project_badges/measure?project=net.kemitix%3Aconditional&metric=vulnerabilities#.svg]]
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[[https://sonarcloud.io/dashboard?id=net.kemitix%3Aconditional][file:https://sonarcloud.io/api/project_badges/measure?project=net.kemitix%3Aconditional&metric=bugs#.svg]]
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[[https://sonarcloud.io/dashboard?id=net.kemitix%3Aconditional][file:https://sonarcloud.io/api/project_badges/measure?project=net.kemitix%3Aconditional&metric=code_smells#.svg]]
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[[https://sonarcloud.io/dashboard?id=net.kemitix%3Aconditional][file:https://sonarcloud.io/api/project_badges/measure?project=net.kemitix%3Aconditional&metric=ncloc#.svg]]
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[[https://app.codacy.com/project/kemitix/conditional/dashboard][file:https://img.shields.io/codacy/grade/1188742d676e457da91415d2b3a5faf1.svg?style=for-the-badge]]
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[[http://i.jpeek.org/net.kemitix/conditional/index.html][file:http://i.jpeek.org/net.kemitix/conditional/badge.svg]]
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** Maven
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#+BEGIN_SRC xml
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<dependency>
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<groupId>net.kemitix</groupId>
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<artifactId>conditional</artifactId>
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<version>RELEASE</version>
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</dependency>
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#+END_SRC
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The latest version should be shown above with the nexus and maven-central
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badges or can be found on [[https://search.maven.org/#search%7Cga%7C1%7Cg%3A%22net.kemitix%22%20AND%20a%3A%22mon%22][Maven Central]].
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** Condition
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The `if ... then` and `if ... then ... else` constructs can't be used in a
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lambda without being wrapped in a code block.
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Using `Condition` allows the use of an if-style expression without needing to
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wrap it in a code block
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*** if-then
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#+BEGIN_SRC java
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if (isTrue()) {
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doSomething();
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}
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Condition.where(isTrue())
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.then(() -> doSomething());
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#+END_SRC
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*** if-then-else
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#+BEGIN_SRC java
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if (isTrue()) {
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doSomething();
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} else {
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doSomethingElse();
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}
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Condition.where(isTrue())
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.then(() -> doSomething())
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.otherwise(() -> doSomethingElse());
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#+END_SRC
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*** if-and-then-else
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#+BEGIN_SRC java
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if (isTrue() && isAlsoTrue()) {
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doSomething();
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} else {
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doSomethingElse();
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}
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Condition.where(isTrue())
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.and(() -> isAlsoTrue())
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.then(() -> doSomething())
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.otherwise(() -> doSomethingElse());
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#+END_SRC
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*** if-or-then-else
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#+BEGIN_SRC java
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if (isTrue() || alternativeIsTrue()) {
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doSomething();
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} else {
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doSomethingElse();
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}
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Condition.where(isTrue())
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.or(() -> alternativeIsTrue())
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.then(() -> doSomething())
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.otherwise(() -> doSomethingElse());
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#+END_SRC
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*** if-not-then-else
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#+BEGIN_SRC java
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if (!isFalse()) {
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doSomething();
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} else {
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doSomethingElse();
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}
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Condition.whereNot(isFalse())
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.then(() -> doSomething())
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.otherwise(() -> doSomethingElse());
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#+END_SRC
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*** if-and-not-then-else
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#+BEGIN_SRC java
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if (isTrue() || !isFalse()) {
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doSomething();
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} else {
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doSomethingElse();
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}
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Condition.where(isTrue())
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.andNot(() -> isFalse())
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.then(() -> doSomething())
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.otherwise(() -> doSomethingElse());
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#+END_SRC
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*** if-or-not-then-else
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#+BEGIN_SRC java
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if (isFalse() || !isAlsoFalse()) {
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doSomething();
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} else {
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doSomethingElse();
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}
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Condition.where(isFalse())
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.orNot(() -> isAlsoFalse())
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.then(() -> doSomething())
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.otherwise(() -> doSomethingElse());
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#+END_SRC
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*** if-then-else-if
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#+BEGIN_SRC java
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if (isFalse()) {
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doSomething();
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} else if (isTrue()) {
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doSomethingElse();
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}
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Condition.where(isFalse())
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.then(() -> doSomething())
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.otherwise(() -> isTrue())
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.then(() -> doSomethingElse());
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#+END_SRC
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*** if-then-if-then
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#+BEGIN_SRC java
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if (isTrue()) {
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doSomething();
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if (isAlsoTrue()) {
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doSomethingElse();
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}
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}
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Condition.where(isTrue())
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.then(() -> doSomething())
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.and(() -> isAlsoTrue())
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.then(() -> doSomethingElse());
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#+END_SRC
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** Value
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Values from an if-then-else in a functional-style.
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Functional, and verbose, alternative to the ternary operator (=?:=).
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*** if-then-else
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#+BEGIN_SRC java
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String result;
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if (isTrue()) {
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result = TRUE;
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} else {
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result = FALSE;
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}
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String result = isTrue() ? TRUE : FALSE;
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final String result = Value.where(isTrue(), () -> TRUE, () -> FALSE);
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final Optional<String> result = Value.where(isTrue(), () -> TRUE);
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final String result = Value.<String>where(isTrue())
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.then(() -> TRUE)
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.otherwise(() -> FALSE);
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#+END_SRC
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*** if-not-then-else
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#+BEGIN_SRC java
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String result;
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if (!isTrue()) {
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result = TRUE;
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} else {
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result = FALSE;
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}
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final String result = Value.<String>whereNot(isTrue())
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.then(() -> TRUE)
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.otherwise(() -> FALSE);
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#+END_SRC
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*** if-and-then-else
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#+BEGIN_SRC java
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String result;
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if (isTrue() && alternativeIsTrue()) {
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result = TRUE;
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} else {
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result = FALSE;
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}
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final String result = Value.<String>where(isTrue())
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.and(() -> alternativeIsTrue())
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.then(() -> TRUE)
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.otherwise(() -> FALSE);
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#+END_SRC
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*** if-and-not-then-else
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#+BEGIN_SRC java
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String result;
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if (isTrue() && !alternativeIsFalse()) {
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result = TRUE;
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} else {
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result = FALSE;
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}
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final String result = Value.<String>where(isTrue())
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.andNot(() -> alternativeIsFalse())
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.then(() -> TRUE)
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.otherwise(() -> FALSE);
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#+END_SRC
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*** if-or-then-else
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#+BEGIN_SRC java
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String result;
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if (isTrue() || alternativeIsTrue()) {
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result = TRUE;
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} else {
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result = FALSE;
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}
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final String result = Value.<String>where(isTrue())
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.or(() -> alternativeIsTrue())
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.then(() -> TRUE)
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.otherwise(() -> FALSE);
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#+END_SRC
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*** if-or-not-then-else
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#+BEGIN_SRC java
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String result;
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if (isTrue() || !isFalse()) {
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result = TRUE;
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} else {
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result = FALSE;
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}
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final String result = Value.<String>where(isTrue())
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.orNot(() -> isFalse())
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.then(() -> TRUE)
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.otherwise(() -> FALSE);
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#+END_SRC
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*** if-then
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#+BEGIN_SRC java
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Optional<String> result;
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if (isTrue()) {
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result = Optional.of(TRUE);
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} else {
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result = Optional.empty();
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}
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final Optional<String> result = Value.<String>where(isTrue())
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.then(() -> TRUE)
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.optional();
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#+END_SRC
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