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/*
* AutoImplementerClass.oj
*
* Apr 29, 1999, by Michiaki Tatsubori
* Feb 2, 1999, by Michiaki Tatsubori
*/
package examples.autoimp;
import openjava.mop.*;
import openjava.ptree.*;
import openjava.syntax.*;
/**
* The metaclass <code>AutoImprementerClass</code> provides classes
* with a facility automatically implementing null methods for
* not implemented methods.
* <p>
*
* @author Michiaki Tatsubori
* @version 1.0
* @see openjava.mop.OJClass#translateDefinition()
* @see openjava.mop.OJClass#isRegisteredModifier()
*/
public class AutoImplementerClass instantiates Metaclass extends OJClass
{
public void translateDefinition() throws MOPException {
OJMethod[] methods = getInheritedMethods();
for (int i = 0; i < methods.length; ++i) {
if (! methods[i].getModifiers().isAbstract()
|| hasDeclaredMethod( methods[i] )) continue;
addMethod( makeNullMethod( methods[i] ) );
}
}
private boolean hasDeclaredMethod( OJMethod m ) {
try {
getDeclaredMethod( m.getName(), m.getParameterTypes() );
return true;
} catch ( NoSuchMemberException e ) {
return false;
}
}
private OJMethod makeNullMethod( OJMethod m ) throws MOPException {
/* generates a new method without body */
OJMethod result = new OJMethod( this,
m.getModifiers().remove( OJModifier.ABSTRACT ),
m.getReturnType(), m.getName(), m.getParameterTypes(),
m.getExceptionTypes(), null
);
/* generates a return statement */
StatementList body = new StatementList();
if (m.getReturnType() == OJSystem.VOID) {
body.add( new ReturnStatement() );
} else {
body.add( new ReturnStatement( Literal.constantNull() ) );
}
result.setBody( body );
return result;
}
}
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