android/sdk/src/main/java/com/taobao/weex/bridge/WXHashMap.java

/*
 * 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 com.taobao.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;
  }

}