AsmCopyAdapter.java

/*******************************************************************************
 * Copyright (c) 2005 Contributors.
 * All rights reserved. 
 * This program and the accompanying materials are made available 
 * under the terms of the Eclipse Public License v1.0 
 * which accompanies this distribution and is available at 
 * http://eclipse.org/legal/epl-v10.html 
 * 
 * Contributors:
 *   Alexandre Vasseur         initial implementation
 *******************************************************************************/
package org.codehaus.aspectwerkz.transform.inlining;

import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Attribute;

/**
 * Adapters to handle annotation copy
 * FIXME license EPL + FIXME field annotation + ctor annotation when all wrapped ??  [but why does it matters]
 *
 * @author <a href="mailto:alex AT gnilux DOT com">Alexandre Vasseur</a>
 */
public class AsmCopyAdapter {

    /**
     * Copy annotation from one to another place
     */
    public static class CopyAnnotationAdapter implements AnnotationVisitor {

        private final AnnotationVisitor m_from;

        private final AnnotationVisitor m_to;

        public CopyAnnotationAdapter(AnnotationVisitor from, AnnotationVisitor copyTo) {
            m_from = from;
            m_to = copyTo;
        }

        public void visit(String name, Object value) {
            m_from.visit(name, value);
            m_to.visit(name, value);
        }

        public void visitEnum(String name, String desc, String value) {
            m_from.visitEnum(name, desc, value);
            m_to.visitEnum(name, desc, value);
        }

        public AnnotationVisitor visitAnnotation(String name, String desc) {
            return new CopyAnnotationAdapter(
                    m_from.visitAnnotation(name, desc),
                    m_to.visitAnnotation(name, desc)
            );
        }

        public AnnotationVisitor visitArray(String name) {
            return new CopyAnnotationAdapter(
                    m_from.visitArray(name),
                    m_to.visitArray(name)
            );
        }

        public void visitEnd() {
            m_from.visitEnd();
            m_to.visitEnd();
        }

    }

    /**
     * Copy all annotations of a method
     * //FIXME needed ?
     */
    public static class CopyMethodAnnotationElseNullAdapter extends AsmNullAdapter.NullMethodAdapter {

        private final MethodVisitor m_copyTo;

        public CopyMethodAnnotationElseNullAdapter(MethodVisitor copyTo) {
            m_copyTo = copyTo;
        }

        public void visitAttribute(Attribute attr) {
            m_copyTo.visitAttribute(attr);
        }

        public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
            return new CopyAnnotationAdapter(
                    AsmNullAdapter.NullAnnotationVisitor.NULL_ANNOTATION_ADAPTER,
                    m_copyTo.visitAnnotation(desc, visible)
            );
        }

        public AnnotationVisitor visitParameterAnnotation(int parameter, String desc, boolean visible) {
            return new CopyAnnotationAdapter(
                    AsmNullAdapter.NullAnnotationVisitor.NULL_ANNOTATION_ADAPTER,
                    m_copyTo.visitParameterAnnotation(parameter, desc, visible)
            );
        }

    }
}