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Paul Campbell 2017-04-21 12:17:18 +01:00
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# Conditional
If-then-else in a functional-style.
## Usage
### if-then
[[source,java]]
----
if (isTrue()) {
doSomething();
}
----
[[source,java]]
----
Condition.where(isTrue())
.then(() -> doSomething());
----
### if-then-else
[[source,java]]
----
if (isTrue()) {
doSomething();
} else {
doSomethingElse();
}
----
[[source,java]]
----
Condition.where(isTrue())
.then(() -> doSomething())
.otherwise(() -> doSomethingElse());
----
### if-and-then-else
[[source,java]]
----
if (isTrue() && isAlsoTrue()) {
doSomething();
} else {
doSomethingElse();
}
----
[[source,java]]
----
Condition.where(isTrue())
.and(isAlsoTrue())
.then(() -> doSomething())
.otherwise(() -> doSomethingElse());
----
### if-or-then-else
[[source,java]]
----
if (isTrue() || alternativeIsTrue()) {
doSomething();
} else {
doSomethingElse();
}
----
[[source,java]]
----
Condition.where(isTrue())
.or(alternativeIsTrue())
.then(() -> doSomething())
.otherwise(() -> doSomethingElse());
----
### if-not-then-else
[[source,java]]
----
if (!isFalse()) {
doSomething();
} else {
doSomethingElse();
}
----
[[source,java]]
----
Condition.whereNot(isFalse())
.then(() -> doSomething())
.otherwise(() -> doSomethingElse());
----
### if-and-not-then-else
[[source,java]]
----
if (isTrue() || !isFalse()) {
doSomething();
} else {
doSomethingElse();
}
----
[[source,java]]
----
Condition.where(isTrue())
.andNot(isFalse())
.then(() -> doSomething())
.otherwise(() -> doSomethingElse());
----
### if-or-not-then-else
[[source,java]]
----
if (isFalse() || !isAlsoFalse()) {
doSomething();
} else {
doSomethingElse();
}
----
[[source,java]]
----
Condition.where(isFalse())
.orNot(isAlsoFalse())
.then(() -> doSomething())
.otherwise(() -> doSomethingElse());
----
### if-then-if-then
[[source,java]]
----
if (isTrue()) {
doSomething();
if (isAlsoTrue()) {
doSomethingElse();
}
}
----
[[source,java]]
----
Condition.where(isTrue())
.then(() -> doSomething())
.and(isAlsoTrue())
.then(() -> doSomethingElse());
----