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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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<div class="section"><h2>Functions: Call<a name="Functions:_Call"></a></h2><p><tt>org.op4j.functions.Call</tt> is a special functions class which allows the execution of a method in the target object.</p><p>Here is an example: Imagine your application has a <tt>User</tt> class which contains a <tt>getName()</tt> method, returning a String. Let's get the names of all the users in a list:</p><div class="source"><pre>List<User> users = ...;
List<String> userNames = Op.on(users).map(Call.methodForString("getName")).get();
</pre></div><p>The <i>methodForX(...)</i> methods in the <tt>Call</tt> class return the following <i>functions</i>:</p><table border="0" class="bodyTable"><tr class="a"><td align="left"><b>Method</b></td><td align="left"><b>Returned function type</b></td></tr><tr class="b"><td align="left"><tt>methodForBigDecimal(...)</tt></td><td align="left"><tt>Function<Object,BigDecimal></tt></td></tr><tr class="a"><td align="left"><tt>methodForBigInteger(...)</tt></td><td align="left"><tt>Function<Object,BigInteger></tt></td></tr><tr class="b"><td align="left"><tt>methodForBoolean(...)</tt></td><td align="left"><tt>Function<Object,Boolean></tt></td></tr><tr class="a"><td align="left"><tt>methodForByte(...)</tt></td><td align="left"><tt>Function<Object,Byte></tt></td></tr><tr class="b"><td align="left"><tt>methodForCalendar(...)</tt></td><td align="left"><tt>Function<Object,Calendar></tt></td></tr><tr class="a"><td align="left"><tt>methodForCharacter(...)</tt></td><td align="left"><tt>Function<Object,Character></tt></td></tr><tr class="b"><td align="left"><tt>methodForDate(...)</tt></td><td align="left"><tt>Function<Object,Date></tt></td></tr><tr class="a"><td align="left"><tt>methodForDouble(...)</tt></td><td align="left"><tt>Function<Object,Double></tt></td></tr><tr class="b"><td align="left"><tt>methodForFloat(...)</tt></td><td align="left"><tt>Function<Object,Float></tt></td></tr><tr class="a"><td align="left"><tt>methodForInteger(...)</tt></td><td align="left"><tt>Function<Object,Integer></tt></td></tr><tr class="b"><td align="left"><tt>methodForLong(...)</tt></td><td align="left"><tt>Function<Object,Long></tt></td></tr><tr class="a"><td align="left"><tt>methodForObject(...)</tt></td><td align="left"><tt>Function<Object,Object></tt></td></tr><tr class="b"><td align="left"><tt>methodForShort(...)</tt></td><td align="left"><tt>Function<Object,Short></tt></td></tr><tr class="a"><td align="left"><tt>methodForString(...)</tt></td><td align="left"><tt>Function<Object,String></tt></td></tr><tr class="b"><td align="left"><tt>methodFor(Type<T>,...)</tt></td><td align="left"><tt>Function<Object,T></tt></td></tr><tr class="a"><td align="left"><tt>methodForArrayOf(Type<T>,...)</tt></td><td align="left"><tt>Function<Object,T[]></tt></td></tr><tr class="b"><td align="left"><tt>methodForArrayOfString(...)</tt></td><td align="left"><tt>Function<Object,String[]></tt></td></tr><tr class="a"><td align="left"><tt>methodForListOf(Type<T>,...)</tt></td><td align="left"><tt>Function<Object,List<T>></tt></td></tr><tr class="b"><td align="left"><tt>methodForListOfString(...)</tt></td><td align="left"><tt>Function<Object,List<String>></tt></td></tr><tr class="a"><td align="left"><tt>methodForSetOf(Type<T>,...)</tt></td><td align="left"><tt>Function<Object,Set<T>></tt></td></tr><tr class="b"><td align="left"><tt>methodForSetOfString(...)</tt></td><td align="left"><tt>Function<Object,Set<String>></tt></td></tr></table><p>There also exist more convenient abbreviated methods, which are:</p><table border="0" class="bodyTable"><tr class="a"><td align="left"><b>Method</b></td><td align="left"><b>Returned function type</b></td></tr><tr class="b"><td align="left"><tt>bigDecimal(...)</tt></td><td align="left"><tt>Function<Object,BigDecimal></tt></td></tr><tr class="a"><td align="left"><tt>bigInteger(...)</tt></td><td align="left"><tt>Function<Object,BigInteger></tt></td></tr><tr class="b"><td align="left"><tt>bool(...)</tt></td><td align="left"><tt>Function<Object,Boolean></tt></td></tr><tr class="a"><td align="left"><tt>calendar(...)</tt></td><td align="left"><tt>Function<Object,Calendar></tt></td></tr><tr class="b"><td align="left"><tt>c(...)</tt></td><td align="left"><tt>Function<Object,Character></tt></td></tr><tr class="a"><td align="left"><tt>date(...)</tt></td><td align="left"><tt>Function<Object,Date></tt></td></tr><tr class="b"><td align="left"><tt>d(...)</tt></td><td align="left"><tt>Function<Object,Double></tt></td></tr><tr class="a"><td align="left"><tt>f(...)</tt></td><td align="left"><tt>Function<Object,Float></tt></td></tr><tr class="b"><td align="left"><tt>i(...)</tt></td><td align="left"><tt>Function<Object,Integer></tt></td></tr><tr class="a"><td align="left"><tt>l(...)</tt></td><td align="left"><tt>Function<Object,Long></tt></td></tr><tr class="b"><td align="left"><tt>obj(...)</tt></td><td align="left"><tt>Function<Object,Object></tt></td></tr><tr class="a"><td align="left"><tt>shr(...)</tt></td><td align="left"><tt>Function<Object,Short></tt></td></tr><tr class="b"><td align="left"><tt>s(...)</tt></td><td align="left"><tt>Function<Object,String></tt></td></tr><tr class="a"><td align="left"><tt>obj(Type<T>,...)</tt></td><td align="left"><tt>Function<Object,T></tt></td></tr><tr class="b"><td align="left"><tt>arrayOf(Type<T>)</tt></td><td align="left"><tt>Function<Object,T[]></tt></td></tr><tr class="a"><td align="left"><tt>arrayOfString()</tt></td><td align="left"><tt>Function<Object,String[]></tt></td></tr><tr class="b"><td align="left"><tt>listOf(Type<T>)</tt></td><td align="left"><tt>Function<Object,List<T>></tt></td></tr><tr class="a"><td align="left"><tt>listOfString()</tt></td><td align="left"><tt>Function<Object,List<String>></tt></td></tr><tr class="b"><td align="left"><tt>setOf(Type<T>)</tt></td><td align="left"><tt>Function<Object,Set<T>></tt></td></tr><tr class="a"><td align="left"><tt>setOfString()</tt></td><td align="left"><tt>Function<Object,Set<String>></tt></td></tr></table><p>Every <i>methodForX(...)</i> or abbreviated method can be passed parameters, and these have to correspond with the parameters of the method being called.</p><div class="source"><pre>List<User> users = ...;
Group group = ...;
...
List<User> usersInGroup =
Op.on(users).removeAllFalse(Call.bool("isInGroup", group).get();
</pre></div></div>
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