/**
    * Copyright 2007 Google Inc.
    *
    * 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.tonicsystems.jarjar;
  
  import com.tonicsystems.jarjar.util.*;
  import java.io.*;
  import java.util.*;
  
  abstract public class AbstractDepHandler implements DepHandler
  {
      protected final int level;
      private final Set<List<Object>> seenIt = new HashSet<List<Object>>();
      
      protected AbstractDepHandler(int level) {
          this.level = level;
      }
      
      public void handle(PathClass from, PathClass to) throws IOException {
          List<Object> pair;
          if (level == LEVEL_JAR) {
              pair = createPair(from.getClassPath(), to.getClassPath());
          } else {
              pair = createPair(from.getClassName(), to.getClassName());
          }
          if (!seenIt.contains(pair)) {
              seenIt.add(pair);
              handle(pair.get(0).toString(), pair.get(1).toString());
          }
      }
  
      abstract protected void handle(String from, String to) throws IOException;
  
      public void handleStart() throws IOException { }
      public void handleEnd() throws IOException { }
  
      private static List<Object> createPair(Object o1, Object o2) {
          List<Object> list = new ArrayList<Object>(2);
          list.add(o1);
          list.add(o2);
          return list;
      }
  }