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.weex.bridge;
  
  import android.text.TextUtils;
  
  import java.util.HashMap;
  import java.util.Stack;
  
  /**
   * HashMap for Weex
   */
  public class WXHashMap<K, V> extends HashMap<K, V> {
  
    private static final long serialVersionUID = 4294272345728974369L;
  
    private Stack<String> instancesStack = new Stack<String>();
    private String mTag;
  
    @Override
    public V put(K key, V value) {
      if (key != null && key.toString() != null) {
        if (instancesStack.contains(key)) {
          instancesStack.remove(key);
        }
        instancesStack.push(key.toString());
      }
      return super.put(key, value);
    }
  
    @Override
    public V remove(Object key) {
      return super.remove(key);
    }
  
    public V removeFromMapAndStack(Object key) {
      instancesStack.remove(key);
      return super.remove(key);
    }
  
    /**
     * Get instance Id of the top of the stack
     *
     * @return
     */
    public String getStackTopInstanceId() {
      return instancesStack.isEmpty() ? "" : instancesStack.pop();
    }
  
    /**
     * Move instanceId to the top of the stack
     *
     * @param id
     */
    public void setStackTopInstance(String id) {
      if (!TextUtils.isEmpty(id)) {
        instancesStack.remove(id);
        instancesStack.push(id);
      }
    }
  
    public Stack<String> getInstanceStack() {
      return instancesStack;
    }
  
    public String getTag() {
      return mTag;
    }
  
    public void setTag(String tag) {
      this.mTag = tag;
    }
  
  }
  