package org.apache.maven.shared.dependency.analyzer.asm;
   
   /*
    * 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.
   */
  
  import org.objectweb.asm.AnnotationVisitor;
  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.objectweb.asm.signature.SignatureReader;
  import org.objectweb.asm.signature.SignatureVisitor;
  
  
  /**
   * Computes the set of classes referenced by visited code.
   * Inspired by <code>org.objectweb.asm.depend.DependencyVisitor</code> in the ASM dependencies example.
   *
   * @author <a href="mailto:markhobson@gmail.com">Mark Hobson</a>
   * @version $Id$
   */
  public class DefaultClassVisitor
      extends ClassVisitor
  {
      // fields -----------------------------------------------------------------
  
      private final ResultCollector resultCollector;
  
      private final SignatureVisitor signatureVisitor;
  
      private final AnnotationVisitor annotationVisitor;
  
      private final FieldVisitor fieldVisitor;
  
      private final MethodVisitor methodVisitor;
  
      // constructors -----------------------------------------------------------
  
      public DefaultClassVisitor( SignatureVisitor signatureVisitor, AnnotationVisitor annotationVisitor,
                                  FieldVisitor fieldVisitor, MethodVisitor methodVisitor,
                                  ResultCollector resultCollector )
      {
          super( Opcodes.ASM8 );
          this.signatureVisitor = signatureVisitor;
          this.annotationVisitor = annotationVisitor;
          this.fieldVisitor = fieldVisitor;
          this.methodVisitor = methodVisitor;
          this.resultCollector = resultCollector;
      }
  
      public void visit( final int version, final int access, final String name, final String signature,
                         final String superName, final String[] interfaces )
      {
          if ( signature == null )
          {
              resultCollector.addName( superName );
              resultCollector.addNames( interfaces );
          }
          else
          {
              addSignature( signature );
          }
      }
  
      public AnnotationVisitor visitAnnotation( final String desc, final boolean visible )
      {
          resultCollector.addDesc( desc );
  
          return annotationVisitor;
      }
  
      public FieldVisitor visitField( final int access, final String name, final String desc, final String signature,
                                      final Object value )
      {
          if ( signature == null )
          {
              resultCollector.addDesc( desc );
          }
          else
          {
              addTypeSignature( signature );
          }
 
         if ( value instanceof Type )
         {
             resultCollector.addType( (Type) value );
         }
 
         return fieldVisitor;
     }
 
     public MethodVisitor visitMethod( final int access, final String name, final String desc, final String signature,
                                       final String[] exceptions )
     {
         if ( signature == null )
         {
             resultCollector.addMethodDesc( desc );
         }
         else
         {
             addSignature( signature );
         }
 
         resultCollector.addNames( exceptions );
 
         return methodVisitor;
     }
 
     public void visitNestHost( final String nestHost )
     {
         resultCollector.addName( nestHost );
     }
 
     public void visitNestMember( final String nestMember )
     {
         resultCollector.addName( nestMember );
     }
 
     // private methods --------------------------------------------------------
 
     private void addSignature( final String signature )
     {
         if ( signature != null )
         {
             new SignatureReader( signature ).accept( signatureVisitor );
         }
     }
 
     private void addTypeSignature( final String signature )
     {
         if ( signature != null )
         {
             new SignatureReader( signature ).acceptType( signatureVisitor );
         }
     }
 
 
 }