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/*
* This code was generated by ojc.
*/
/*
* MixinedClass.oj
*
* An OpenJava example for incorporating mixin mechanism.
*
* @author Michiaki Tatsubori
* @version %VERSION% %DATE%
* @see java.lang.Object
*
* COPYRIGHT 1999 by Michiaki Tatsubori, ALL RIGHTS RESERVED.
*/
package examples.mixin;
import java.lang.Object;
import openjava.mop.*;
import openjava.ptree.*;
import openjava.syntax.*;
/**
* The metaclass <code>MixinedClass</code> supports classes
* using mixin.
* <p>
* For example, the class <code>MixinedClass</code>:
* <pre>
* public class TextboxWithUndo instantiates MixinedClass
* extends Textbox mixs Undo
* {
* }
* </pre>
* would be automatically implemented.
* <p>
*
* @author Michiaki Tatsubori
* @version 1.0
* @since $Id: MixinedClass.java,v 1.2 2003/02/19 02:55:01 tatsubori Exp $
* @see java.lang.Object
*/
public class MixinedClass extends OJClass
{
public static final String KEY_MIXES = "mixes";
/* overrides for translation */
public void translateDefinition()
throws MOPException
{
OJClass[] mixinClasses = getMixins();
for (int i = 0; i < mixinClasses.length; ++i) {
incorporateMixin( mixinClasses[i] );
}
}
public void incorporateMixin( OJClass mixinClazz )
throws MOPException
{
addInterface( mixinClazz );
OJMethod[] mixeds = mixinClazz.getMethods();
for (int i = 0; i < mixeds.length; ++i) {
addMethod( makeEmptyMethod( mixeds[i] ) );
}
}
/**
* Generates a empty method with specified name.
*
* @param name generating method's name.
* @param forwarded method to which the generated method forwards.
* @return a generated empty method.
*/
private OJMethod makeEmptyMethod( OJMethod implementee )
throws MOPException
{
StatementList body = new StatementList();
if (implementee.getReturnType() == OJSystem.VOID) {
body.add( new ReturnStatement() );
} else {
body.add( new ReturnStatement( Literal.constantNull() ) );
}
return new OJMethod( this, implementee.getModifiers().remove( OJModifier.ABSTRACT ), implementee.getReturnType(), implementee.getName(), implementee.getParameterTypes(), implementee.getExceptionTypes(), body );
}
/* extended information */
private OJClass[] getMixins()
throws MOPException
{
ObjectList suffix = (ObjectList) getSuffix( KEY_MIXES );
OJClass[] result = new OJClass[suffix.size()];
for (int i = 0; i < result.length; ++i) {
result[i] = OJClass.forName( suffix.get( i ).toString() );
}
return result;
}
/* override to extend syntax */
public static boolean isRegisteredKeyword( String keyword )
{
return keyword.equals( KEY_MIXES );
}
/* override to extend syntax */
public static SyntaxRule getDeclSuffixRule( String keyword )
{
if (keyword.equals( KEY_MIXES )) {
return new DefaultListRule( new TypeNameRule(), TokenID.COMMA );
}
return null;
}
public MixinedClass( openjava.mop.Environment oj_param0, openjava.mop.OJClass oj_param1, openjava.ptree.ClassDeclaration oj_param2 )
{
super( oj_param0, oj_param1, oj_param2 );
}
public MixinedClass( java.lang.Class oj_param0, openjava.mop.MetaInfo oj_param1 )
{
super( oj_param0, oj_param1 );
}
}
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