Apache 枚举工具类的源码的分析
jacky的部落 2009-12-15
Apache commons-lang报的枚举工具类的学习应用：
他提供的根据枚举的类方法如下逐个分析
备注咋Apache commons-lang中枚举对象（Enum是一个封装枚举类而非枚举类型）
public class EnumUtils {
/**
*Publicconstructor.Thisclassshouldnotnormallybeinstantiated.
*@since2.0
*/
publicEnumUtils(){
super();
}/**
* 根据枚举类和类型类型的名称（value）查找枚举
*<p>Getsan<code>Enum</code>objectbyclassandname.</p>
*
*@paramenumClasstheclassofthe<code>Enum</code>toget
*@paramnamethenameoftheEnumtoget,maybe<code>null</code>
*@returntheenumobject
*@throwsIllegalArgumentExceptioniftheenumclassis<code>null</code>
*/
publicstaticEnumgetEnum(ClassenumClass,Stringname){
returnEnum.getEnum(enumClass,name);
}/**根据枚举类和枚举键查找
*<p>Getsa<code>ValuedEnum</code>objectbyclassandvalue.</p>
*
*@paramenumClasstheclassofthe<code>Enum</code>toget
*@paramvaluethevalueofthe<code>Enum</code>toget
*@returntheenumobject,ornulliftheenumdoesnotexist
*@throwsIllegalArgumentExceptioniftheenumclassis<code>null</code>
*/
publicstaticValuedEnumgetEnum(ClassenumClass,intvalue){
return(ValuedEnum)ValuedEnum.getEnum(enumClass,value);
}/**根据枚举类查找所有枚举类型的Map
*<p>Getsthe<code>Map</code>of<code>Enum</code>objectsby
*nameusingthe<code>Enum</code>class.</p>
*
*<p>Iftherequestedclasshasnoenumobjectsanempty
*<code>Map</code>isreturned.The<code>Map</code>isunmodifiable.</p>
*
*@paramenumClasstheclassofthe<code>Enum</code>toget
*@returntheenumobjectMap
*@throwsIllegalArgumentExceptioniftheenumclassis<code>null</code>
*@throwsIllegalArgumentExceptioniftheenumclassisnotasubclass
*of<code>Enum</code>
*/
publicstaticMapgetEnumMap(ClassenumClass){
returnEnum.getEnumMap(enumClass);
}/**根据枚举类所有枚举类型集合
*<p>Getsthe<code>List</code>of<code>Enum</code>objectsusing
*the<code>Enum</code>class.</p>
*
*<p>Thelistisintheorderthattheobjectswerecreated
*(sourcecodeorder).</p>
*
*<p>Iftherequestedclasshasnoenumobjectsanempty
*<code>List</code>isreturned.The<code>List</code>isunmodifiable.</p>
*
*@paramenumClasstheclassoftheEnumtoget
*@returntheenumobjectMap
*@throwsIllegalArgumentExceptioniftheenumclassis<code>null</code>
*@throwsIllegalArgumentExceptioniftheenumclassisnotasubclass
*of<code>Enum</code>
*/
publicstaticListgetEnumList(ClassenumClass){
returnEnum.getEnumList(enumClass);
}/**
*<p>Getsan<code>Iterator</code>overthe<code>Enum</code>objects
*inan<code>Enum</code>class.</p>
*
*<p>Theiteratorisintheorderthattheobjectswerecreated
*(sourcecodeorder).</p>
*
*<p>Iftherequestedclasshasnoenumobjectsanempty
*<code>Iterator</code>isreturned.The<code>Iterator</code>
*isunmodifiable.</p>
*
*@paramenumClasstheclassofthe<code>Enum</code>toget
*@returnan<code>Iterator</code>ofthe<code>Enum</code>objects
*@throwsIllegalArgumentExceptioniftheenumclassis<code>null</code>
*@throwsIllegalArgumentExceptioniftheenumclassisnotasubclassof<code>Enum</code>
*/
publicstaticIteratoriterator(ClassenumClass){
returnEnum.getEnumList(enumClass).iterator();
}
}
