what is this SearchMatchPurose class does at ConvertConstantsToEnumRefactoring class

[Md Arefin]

//What rule the SearchMatchPurpose class has in converting Enum 

package edu.ohio_state.khatchad.refactoring;

public class ConvertConstantsToEnumRefactoring extends Refactoring {

static class SearchMatchPurpose {

public static final SearchMatchPurpose ALTER_INFIX_EXPRESSION = new SearchMatchPurpose();

public static final SearchMatchPurpose ALTER_NAMESPACE_PREFIX = new SearchMatchPurpose();

public static final SearchMatchPurpose ALTER_TYPE_DECLARATION = new SearchMatchPurpose();

private SearchMatchPurpose() {

}

}

[Raffi Takvor Khatchadourian]

Eclipse has a built-in search engine that searches through Java code. In fact, you can access it via the UI from the “Search” menu and perform a “Java” search. With SearchMatchPurpose, we are simply recording the reason we are searching for particular elements. SearchMatchPurpose is just a singleton class (kind of like an enum but since we can’t use enums in JDK 1.4, we used this pattern). The three reasons of why we search for other Java elements in the project correspond to the constants. 

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