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.weaving;
  
  import static org.objectweb.asm.Opcodes.ASM9;
  
  import java.lang.reflect.Modifier;
  
  import org.objectweb.asm.FieldVisitor;
  import org.objectweb.asm.Opcodes;
  import org.objectweb.asm.Type;
  import org.objectweb.asm.commons.SerialVersionUIDAdder;
  
  class SyntheticSerialVerUIDAdder extends SerialVersionUIDAdder {
  
    private WovenProxyAdapter wpa;
  
    //copied from superclass, they are now private
    /**
     * Flag that indicates if we need to compute SVUID.
     */
    private boolean computeSVUID;
  
    /**
     * Set to true if the class already has SVUID.
     */
    private boolean hasSVUID;
  
    public SyntheticSerialVerUIDAdder(WovenProxyAdapter cv) {
      super(ASM9, cv);
      wpa = cv;
    }
  
    // The following visit and visitField methods are workaround since ASM4 does not supply the javadoced method isHasSVUID() by mistake. 
    // When the method isHasSVUId() or similar methods available, we can remove the following two methods.
  
    @Override
    public void visit(
        final int version,
        final int access,
        final String name,
        final String signature,
        final String superName,
        final String[] interfaces) {
      computeSVUID = (access & Opcodes.ACC_INTERFACE) == 0;
      super.visit(version, access, name, signature, superName, interfaces);
    }
  
    @Override
    public FieldVisitor visitField(
        final int access,
        final String name,
        final String desc,
        final String signature,
        final Object value) {
      if (computeSVUID) {
        if ("serialVersionUID".equals(name) && Modifier.isFinal(access) && Modifier.isStatic(access) && Type.LONG_TYPE.equals(Type.getType(desc))) {
          // since the class already has SVUID, we won't be computing it.
          computeSVUID = false;
          hasSVUID = true;
        }
      }
  
      return super.visitField(access, name, desc, signature, value);
    }
  
    @Override
    public void visitEnd() {
  
      wpa.setSVUIDGenerated(!hasSVUID);
      super.visitEnd();
    }
  }
  