content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.apache.aries.proxy.impl.gen;
  
  import java.util.Collection;
  
  import org.objectweb.asm.AnnotationVisitor;
  import org.objectweb.asm.Attribute;
  import org.objectweb.asm.ClassVisitor;
  import org.objectweb.asm.FieldVisitor;
  import org.objectweb.asm.MethodVisitor;
  import org.objectweb.asm.Opcodes;
  import org.objectweb.asm.Type;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /*
   * Although we implement ClassVisitor we are only interested in the methods of
   * the superclasses in the hierarchy.  For this reason although visitMethod is 
   * implemented the other methods of ClassVisitor are currently no-op.
   *
   *
   */
  public class ProxySubclassHierarchyAdapter extends ClassVisitor implements Opcodes
  {
  
    private ProxySubclassAdapter adapter = null;
    private Collection<String> methodsToImplement = null;
  
    private static Logger LOGGER = LoggerFactory.getLogger(ProxySubclassHierarchyAdapter.class);
  
    ProxySubclassHierarchyAdapter(ProxySubclassAdapter adapter, Collection<String> methodsToImplement)
    {
      super(Opcodes.ASM9);
      LOGGER.debug(Constants.LOG_ENTRY, "ProxySubclassHeirarchyAdapter", new Object[] {
          this, adapter, methodsToImplement });
  
      this.methodsToImplement = methodsToImplement;
      this.adapter = adapter;
  
      LOGGER.debug(Constants.LOG_EXIT, "ProxySubclassHeirarchyAdapter", this);
    }
  
    public MethodVisitor visitMethod(int access, String name, String desc, String signature,
        String[] exceptions)
    {
      LOGGER.debug(Constants.LOG_ENTRY, "visitMethod", new Object[] { access, name, desc,
          signature, exceptions });
  
      // if the method we find in the superclass is one that is available on
      // the class
      // we are dynamically subclassing then we need to implement an
      // invocation for it
      String argDesc = ProxySubclassMethodHashSet.typeArrayToStringArgDescriptor(Type
          .getArgumentTypes(desc));
      if (methodsToImplement.contains(name + argDesc)) {
        // create the method in bytecode
        adapter.visitMethod(access, name, desc, signature, exceptions);
      }
  
      LOGGER.debug(Constants.LOG_EXIT, "visitMethod");
  
      // always return null because we don't want to copy any method code
      return null;
    }
  
    public void visit(int arg0, int arg1, String arg2, String arg3, String arg4, String[] arg5)
    {
      // no-op
    }
  
    public AnnotationVisitor visitAnnotation(String arg0, boolean arg1)
    {
      // don't process any annotations at this stage
      return null;
    }
  
    public void visitAttribute(Attribute arg0)
    {
      // no-op
    }
  
    public void visitEnd()
    {
      // no-op
    }
  
    public FieldVisitor visitField(int arg0, String arg1, String arg2, String arg3, Object arg4)
    {
      // don't process fields
      return null;
    }
  
    public void visitInnerClass(String arg0, String arg1, String arg2, int arg3)
    {
      // no-op
    }
  
    public void visitOuterClass(String arg0, String arg1, String arg2)
    {
      // no-op
    }
  
    public void visitSource(String arg0, String arg1)
    {
      // no-op
    }
  
  }
  