/*
    * Copyright (C) 2009 Jayway AB
    *
    * Licensed 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 com.simpligility.maven.plugins.android.asm;
  
  import org.apache.commons.lang3.StringUtils;
  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 java.util.concurrent.atomic.AtomicBoolean;
  
  /**
   * Finds descendants of any class from specific parent packages.
   * Will remember if any match was found, and returns that fact in {@link #isDescendantFound()}.
   *
   * @author hugo.josefson@jayway.com
   */
  class DescendantFinder extends ClassVisitor
  {
  
      /**
       * Constructs this finder.
       *
       * @param parentPackages Packages to find descendants of. Must be formatted with <code>/</code> (slash) instead of
       *                       <code>.</code> (dot). For example: <code>junit/framework/</code>
       */
      DescendantFinder( String... parentPackages )
      {
          super( Opcodes.ASM4 );
          this.parentPackages = parentPackages;
      }
  
      private final String[] parentPackages;
      private final AtomicBoolean isDescendantFound = new AtomicBoolean( false );
  
      @Override
      public void visit( int version, int access, String name, String signature, String superName, String[] interfaces )
      {
          for ( String testPackage : parentPackages )
          {
              if ( StringUtils.startsWith( superName, testPackage ) )
              {
                  flagAsFound();
                  //                System.out.println(name + " extends " + superName);
              }
          }
      }
  
      private void flagAsFound()
      {
          isDescendantFound.set( true );
      }
  
      /**
       * Returns whether a match was found.
       *
       * @return <code>true</code> is a match was found, <code>false</code> otherwise.
       */
      public boolean isDescendantFound()
      {
          return isDescendantFound.get();
      }
  
      @Override
      public void visitSource( String source, String debug )
      {
      }
  
      @Override
      public void visitOuterClass( String owner, String name, String desc )
      {
      }
  
      @Override
      public AnnotationVisitor visitAnnotation( String desc, boolean visible )
      {
          return null;
      }
  
      @Override
      public void visitAttribute( Attribute attr )
      {
      }
 
     @Override
     public void visitInnerClass( String name, String outerName, String innerName, int access )
     {
     }
 
     @Override
     public FieldVisitor visitField( int access, String name, String desc, String signature, Object value )
     {
         return null;
     }
 
     @Override
     public MethodVisitor visitMethod( int access, String name, String desc, String signature, String[] exceptions )
     {
         return null;
     }
 
     @Override
     public void visitEnd()
     {
     }
 }