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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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Functions: FnFunc</title>
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<div class="section"><h2>Functions: FnFunc<a name="Functions:_FnFunc"></a></h2>
<div class="section"><h3>1. Overview<a name="a1._Overview"></a></h3>
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<b><a class="externalLink" href="https://www.op4j.org/apidocs/org/op4j/functions/FnFunc.html">FnFunc</a></b> is a <i>function hub class</i>
containing basic static methods that operate on Objects
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<div class="section"><h3>2. Functions<a name="a2._Functions"></a></h3>
<table class="bodyTable" border="0">
<thead><tr class="a"><th>Function name</th><th>Type</th><th width="240px">Params</th><th>Description</th></tr></thead>
<tbody>
<tr class="b"><td><b>chain</b></td><td>Function<X,Z></td><td>IFunction<X,Y> fn1<br />IFunction<? super Y,Z> fn2</td><td><p> Chains two functions together. The returned function executes the specified functions in sequence, being <tt>fn2</tt> executed on the results of <tt>fn1</tt>. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>ifFalseThen</b></td><td>Function<T,T></td><td>Type<T> targetType<br />IFunction<? super T, Boolean> condition<br />IFunction<? super T,? extends T> thenFunction</td><td><p> Builds a function that will execute the specified function <tt>thenFunction</tt> only if the result of executing <tt>condition</tt> on the target object is false. </p> <p> The built function cannot change the return type (receives <tt>T</tt> and returns <tt>T</tt>) because the <tt>thenFunction</tt> could remain unexecuted, and so the type returned by <tt>thenFunction</tt> must be the same as the type required as input, in order to keep consistency. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>ifFalseThenElse</b></td><td>Function<T,R></td><td>Type<T> targetType<br />IFunction<? super T, Boolean> condition<br />IFunction<? super T,R> thenFunction<br />IFunction<? super T,R> elseFunction</td><td><p> Builds a function that will execute the specified function <tt>thenFunction</tt> only if the result of executing <tt>condition</tt> on the target object is false, and will execute the specified function <tt>elseFunction</tt> otherwise. </p> <p> The built function can effectively change the target type (receive <tt>T</tt> and return <tt>R</tt>) if both <tt>thenFunction</tt> and <tt>elseFunction</tt> return the same type, and this is different than the target type <tt>T</tt>. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>ifNotNullAndFalseThen</b></td><td>Function<T,T></td><td>Type<T> targetType<br />IFunction<? super T, Boolean> condition<br />IFunction<? super T,? extends T> thenFunction</td><td><p> Builds a function that will execute the specified function <tt>thenFunction</tt> only if the target object is not null and the result of executing <tt>condition</tt> on it is false. </p> <p> The built function cannot change the return type (receives <tt>T</tt> and returns <tt>T</tt>) because the <tt>thenFunction</tt> could remain unexecuted, and so the type returned by <tt>thenFunction</tt> must be the same as the type required as input, in order to keep consistency. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>ifNotNullAndFalseThenElse</b></td><td>Function<T,R></td><td>Type<T> targetType<br />IFunction<? super T, Boolean> condition<br />IFunction<? super T,R> thenFunction<br />IFunction<? super T,R> elseFunction</td><td><p> Builds a function that will execute the specified function <tt>thenFunction</tt> only if the target object is not null and the result of executing <tt>condition</tt> on the target object is false, and will execute the specified function <tt>elseFunction</tt> otherwise. </p> <p> The built function can effectively change the target type (receive <tt>T</tt> and return <tt>R</tt>) if both <tt>thenFunction</tt> and <tt>elseFunction</tt> return the same type, and this is different than the target type <tt>T</tt>. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>ifNotNullAndTrueThen</b></td><td>Function<T,T></td><td>Type<T> targetType<br />IFunction<? super T, Boolean> condition<br />IFunction<? super T,? extends T> thenFunction</td><td><p> Builds a function that will execute the specified function <tt>thenFunction</tt> only if the target object is not null and the result of executing <tt>condition</tt> on it is true. </p> <p> The built function cannot change the return type (receives <tt>T</tt> and returns <tt>T</tt>) because the <tt>thenFunction</tt> could remain unexecuted, and so the type returned by <tt>thenFunction</tt> must be the same as the type required as input, in order to keep consistency. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>ifNotNullAndTrueThenElse</b></td><td>Function<T,R></td><td>Type<T> targetType<br />IFunction<? super T, Boolean> condition<br />IFunction<? super T,R> thenFunction<br />IFunction<? super T,R> elseFunction</td><td><p> Builds a function that will execute the specified function <tt>thenFunction</tt> only if the target object is not null and the result of executing <tt>condition</tt> on the target object is true, and will execute the specified function <tt>elseFunction</tt> otherwise. </p> <p> The built function can effectively change the target type (receive <tt>T</tt> and return <tt>R</tt>) if both <tt>thenFunction</tt> and <tt>elseFunction</tt> return the same type, and this is different than the target type <tt>T</tt>. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>ifNotNullThen</b></td><td>Function<T,T></td><td>Type<T> targetType<br />IFunction<? super T,? extends T> thenFunction</td><td><p> Builds a function that will execute the specified function <tt>thenFunction</tt> only if the target object is not null. </p> <p> The built function cannot change the return type (receives <tt>T</tt> and returns <tt>T</tt>) because the <tt>thenFunction</tt> could remain unexecuted, and so the type returned by <tt>thenFunction</tt> must be the same as the type required as input, in order to keep consistency. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>ifNotNullThenElse</b></td><td>Function<T,R></td><td>Type<T> targetType<br />IFunction<? super T,R> thenFunction<br />IFunction<? super T,R> elseFunction</td><td><p> Builds a function that will execute the specified function <tt>thenFunction</tt> only if the target object is not null, and will execute the specified function <tt>elseFunction</tt> otherwise. </p> <p> The built function can effectively change the target type (receive <tt>T</tt> and return <tt>R</tt>) if both <tt>thenFunction</tt> and <tt>elseFunction</tt> return the same type, and this is different than the target type <tt>T</tt>. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>ifNullOrFalseThen</b></td><td>Function<T,T></td><td>Type<T> targetType<br />IFunction<? super T, Boolean> condition<br />IFunction<? super T,? extends T> thenFunction</td><td><p> Builds a function that will execute the specified function <tt>thenFunction</tt> only if the target object is null or the result of executing <tt>condition</tt> on it is false. </p> <p> The built function cannot change the return type (receives <tt>T</tt> and returns <tt>T</tt>) because the <tt>thenFunction</tt> could remain unexecuted, and so the type returned by <tt>thenFunction</tt> must be the same as the type required as input, in order to keep consistency. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>ifNullOrFalseThenElse</b></td><td>Function<T,R></td><td>Type<T> targetType<br />IFunction<? super T, Boolean> condition<br />IFunction<? super T,R> thenFunction<br />IFunction<? super T,R> elseFunction</td><td><p> Builds a function that will execute the specified function <tt>thenFunction</tt> only if the target object is null or the result of executing <tt>condition</tt> on the target object is false, and will execute the specified function <tt>elseFunction</tt> otherwise. </p> <p> The built function can effectively change the target type (receive <tt>T</tt> and return <tt>R</tt>) if both <tt>thenFunction</tt> and <tt>elseFunction</tt> return the same type, and this is different than the target type <tt>T</tt>. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>ifNullOrTrueThen</b></td><td>Function<T,T></td><td>Type<T> targetType<br />IFunction<? super T, Boolean> condition<br />IFunction<? super T,? extends T> thenFunction</td><td><p> Builds a function that will execute the specified function <tt>thenFunction</tt> only if the target object is null or the result of executing <tt>condition</tt> on it is true. </p> <p> The built function cannot change the return type (receives <tt>T</tt> and returns <tt>T</tt>) because the <tt>thenFunction</tt> could remain unexecuted, and so the type returned by <tt>thenFunction</tt> must be the same as the type required as input, in order to keep consistency. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>ifNullOrTrueThenElse</b></td><td>Function<T,R></td><td>Type<T> targetType<br />IFunction<? super T, Boolean> condition<br />IFunction<? super T,R> thenFunction<br />IFunction<? super T,R> elseFunction</td><td><p> Builds a function that will execute the specified function <tt>thenFunction</tt> only if the target object is null or the result of executing <tt>condition</tt> on the target object is true, and will execute the specified function <tt>elseFunction</tt> otherwise. </p> <p> The built function can effectively change the target type (receive <tt>T</tt> and return <tt>R</tt>) if both <tt>thenFunction</tt> and <tt>elseFunction</tt> return the same type, and this is different than the target type <tt>T</tt>. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>ifNullThen</b></td><td>Function<T,T></td><td>Type<T> targetType<br />IFunction<? super T,? extends T> thenFunction</td><td><p> Builds a function that will execute the specified function <tt>thenFunction</tt> only if the target object is null. </p> <p> The built function cannot change the return type (receives <tt>T</tt> and returns <tt>T</tt>) because the <tt>thenFunction</tt> could remain unexecuted, and so the type returned by <tt>thenFunction</tt> must be the same as the type required as input, in order to keep consistency. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>ifNullThenElse</b></td><td>Function<T,R></td><td>Type<T> targetType<br />IFunction<? super T,R> thenFunction<br />IFunction<? super T,R> elseFunction</td><td><p> Builds a function that will execute the specified function <tt>thenFunction</tt> only if the target object is null, and will execute the specified function <tt>elseFunction</tt> otherwise. </p> <p> The built function can effectively change the target type (receive <tt>T</tt> and return <tt>R</tt>) if both <tt>thenFunction</tt> and <tt>elseFunction</tt> return the same type, and this is different than the target type <tt>T</tt>. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>ifTrueThen</b></td><td>Function<T,T></td><td>Type<T> targetType<br />IFunction<? super T, Boolean> condition<br />IFunction<? super T,? extends T> thenFunction</td><td><p> Builds a function that will execute the specified function <tt>thenFunction</tt> only if the result of executing <tt>condition</tt> on the target object is true. </p> <p> The built function cannot change the return type (receives <tt>T</tt> and returns <tt>T</tt>) because the <tt>thenFunction</tt> could remain unexecuted, and so the type returned by <tt>thenFunction</tt> must be the same as the type required as input, in order to keep consistency. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>ifTrueThenElse</b></td><td>Function<T,R></td><td>Type<T> targetType<br />IFunction<? super T, Boolean> condition<br />IFunction<? super T,R> thenFunction<br />IFunction<? super T,R> elseFunction</td><td><p> Builds a function that will execute the specified function <tt>thenFunction</tt> only if the result of executing <tt>condition</tt> on the target object is true, and will execute the specified function <tt>elseFunction</tt> otherwise. </p> <p> The built function can effectively change the target type (receive <tt>T</tt> and return <tt>R</tt>) if both <tt>thenFunction</tt> and <tt>elseFunction</tt> return the same type, and this is different than the target type <tt>T</tt>. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="a"><td><b>whileFalse</b></td><td>Function<T,T></td><td>IFunction<? super T, Boolean> condition<br />IFunction<? super T, T> function</td><td><p> Executes the specified <tt>function</tt> iteratively (first on the target, then on the result of the previous iteration) while the result of executing the <tt>condition</tt> function on the target object (or the result of the previous <tt>function</tt> iteration) is false. </p></td></tr>
<tr class="" bgcolor="#A4A4A4"><td bgcolor="#A4A4A4" colspan="4"></td></tr>
<tr class="b"><td><b>whileTrue</b></td><td>Function<T,T></td><td>IFunction<? super T, Boolean> condition<br />IFunction<? super T, T> function</td><td><p> Executes the specified <tt>function</tt> iteratively (first on the target, then on the result of the previous iteration) while the result of executing the <tt>condition</tt> function on the target object (or the result of the previous <tt>function</tt> iteration) is true. </p></td></tr>
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