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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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<title>op4j: bending the Java spoon - Functions: Get</title>
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<strong>· Get</strong>
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<div class="section"><h2>Functions: Get<a name="Functions:_Get"></a></h2><p><tt>org.op4j.functions.Get</tt> is a special functions class which allows the retrieval of attribute values through the execution of <i>getter</i> methods.</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(Get.attrOfString("name")).get();
</pre></div><p>The <i>attrOfX(...)</i> methods in the <tt>Get</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>attrOfBigDecimal()</tt></td><td align="left"><tt>Function<Object,BigDecimal></tt></td></tr><tr class="a"><td align="left"><tt>attrOfBigInteger()</tt></td><td align="left"><tt>Function<Object,BigInteger></tt></td></tr><tr class="b"><td align="left"><tt>attrOfBoolean()</tt></td><td align="left"><tt>Function<Object,Boolean></tt></td></tr><tr class="a"><td align="left"><tt>attrOfByte()</tt></td><td align="left"><tt>Function<Object,Byte></tt></td></tr><tr class="b"><td align="left"><tt>attrOfCalendar()</tt></td><td align="left"><tt>Function<Object,Calendar></tt></td></tr><tr class="a"><td align="left"><tt>attrOfCharacter()</tt></td><td align="left"><tt>Function<Object,Character></tt></td></tr><tr class="b"><td align="left"><tt>attrOfDate()</tt></td><td align="left"><tt>Function<Object,Date></tt></td></tr><tr class="a"><td align="left"><tt>attrOfDouble()</tt></td><td align="left"><tt>Function<Object,Double></tt></td></tr><tr class="b"><td align="left"><tt>attrOfFloat()</tt></td><td align="left"><tt>Function<Object,Float></tt></td></tr><tr class="a"><td align="left"><tt>attrOfInteger()</tt></td><td align="left"><tt>Function<Object,Integer></tt></td></tr><tr class="b"><td align="left"><tt>attrOfLong()</tt></td><td align="left"><tt>Function<Object,Long></tt></td></tr><tr class="a"><td align="left"><tt>attrOfObject()</tt></td><td align="left"><tt>Function<Object,Object></tt></td></tr><tr class="b"><td align="left"><tt>attrOfShort()</tt></td><td align="left"><tt>Function<Object,Short></tt></td></tr><tr class="a"><td align="left"><tt>attrOfString()</tt></td><td align="left"><tt>Function<Object,String></tt></td></tr><tr class="b"><td align="left"><tt>attrOf(Type<T>)</tt></td><td align="left"><tt>Function<Object,T></tt></td></tr><tr class="a"><td align="left"><tt>attrOfArrayOf(Type<T>)</tt></td><td align="left"><tt>Function<Object,T[]></tt></td></tr><tr class="b"><td align="left"><tt>attrOfArrayOfString()</tt></td><td align="left"><tt>Function<Object,String[]></tt></td></tr><tr class="a"><td align="left"><tt>attrOfListOf(Type<T>)</tt></td><td align="left"><tt>Function<Object,List<T>></tt></td></tr><tr class="b"><td align="left"><tt>attrOfListOfString()</tt></td><td align="left"><tt>Function<Object,List<String>></tt></td></tr><tr class="a"><td align="left"><tt>attrOfSetOf(Type<T>)</tt></td><td align="left"><tt>Function<Object,Set<T>></tt></td></tr><tr class="b"><td align="left"><tt>attrOfSetOfString()</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></div>
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