2017-04-21 12:17:18 +01:00
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# Conditional
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2017-04-23 21:37:22 +01:00
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image:https://travis-ci.org/kemitix/conditional.svg?branch=master["Build Status", link="https://travis-ci.org/kemitix/conditional"]
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image::https://coveralls.io/repos/github/kemitix/conditional/badge.svg?branch=master["Coverage Status", link="https://coveralls.io/github/kemitix/conditional?branch=master"]
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* link:#_condition[Condition]
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* link:#_value[Value]
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2017-04-21 12:17:18 +01:00
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2017-04-23 21:37:22 +01:00
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## Condition
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If-then-else in a functional-style.
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2017-04-21 12:17:18 +01:00
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### if-then
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[[source,java]]
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----
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if (isTrue()) {
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doSomething();
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}
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----
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[[source,java]]
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----
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Condition.where(isTrue())
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.then(() -> doSomething());
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----
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### if-then-else
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[[source,java]]
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----
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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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----
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[[source,java]]
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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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----
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### if-and-then-else
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[[source,java]]
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----
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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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----
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[[source,java]]
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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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----
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### if-or-then-else
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[[source,java]]
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----
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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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----
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[[source,java]]
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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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----
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### if-not-then-else
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[[source,java]]
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----
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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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----
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[[source,java]]
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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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----
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### if-and-not-then-else
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[[source,java]]
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----
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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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----
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[[source,java]]
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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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----
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### if-or-not-then-else
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[[source,java]]
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----
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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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----
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[[source,java]]
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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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----
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2017-04-21 14:28:54 +01:00
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### if-then-else-if
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[[source,java]]
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----
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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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----
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[[source,java]]
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----
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Condition.where(isFalse())
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.then(() -> doSomething())
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2017-04-21 14:30:55 +01:00
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.otherwise(isTrue())
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2017-04-21 14:28:54 +01:00
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.then(() -> doSomethingElse());
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----
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2017-04-21 12:17:18 +01:00
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### if-then-if-then
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[[source,java]]
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----
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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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----
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[[source,java]]
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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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----
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2017-04-23 21:37:22 +01:00
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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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[[source,java]]
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----
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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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----
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[[source,java]]
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----
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String result = isTrue() ? TRUE : FALSE;
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----
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[[source,java]]
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----
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final String result = Value.<String>where(isTrue()).then(() -> TRUE)
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.otherwise(() -> FALSE);
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----
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### if-not-then-else
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[[source,java]]
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----
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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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----
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[[source,java]]
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----
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final String result = Value.<String>whereNot(isTrue()).then(() -> TRUE)
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.otherwise(() -> FALSE);
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----
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### if-and-then-else
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[[source,java]]
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----
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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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----
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[[source,java]]
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----
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final String result = Value.<String>where(isTrue()).and(alternativeIsTrue())
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.then(() -> TRUE)
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.otherwise(() -> FALSE);
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----
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### if-and-not-then-else
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[[source,java]]
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----
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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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----
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[[source,java]]
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----
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final String result = Value.<String>where(isTrue()).andNot(alternativeIsFalse())
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.then(() -> TRUE)
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.otherwise(() -> FALSE);
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----
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### if-or-then-else
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[[source,java]]
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----
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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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----
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[[source,java]]
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----
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final String result = Value.<String>where(isTrue()).or(alternativeIsTrue())
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.then(() -> TRUE)
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.otherwise(() -> FALSE);
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----
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### if-or-not-then-else
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[[source,java]]
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----
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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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----
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[[source,java]]
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----
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final String result = Value.<String>where(isTrue()).orNot(isFalse())
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.then(() -> TRUE)
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.otherwise(() -> FALSE);
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----
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