JSONMap.java example

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errai-master
/*
 * Copyright (C) 2012 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.jboss.errai.ui.shared;

import java.util.HashSet;
import java.util.Set;

import com.google.gwt.core.client.JavaScriptObject;

/**
 * A JSON map of key-value data.
 * @author eric.wittmann@redhat.com
 */
public final class JSONMap extends JavaScriptObject {

  public static native JSONMap create(String jsonData) /*-{
    return eval('['+jsonData+']')[0];
  }-*/;

  /**
   * Constructor.
   */
  protected JSONMap() {
  }

  /**
   * Get a single value from the map.
   * @param key
   */
  public final native String get(String key) /*-{
    return String(this[key]);
  }-*/;

  /**
   * @return all the keys in the map
   */
  public final Set<String> keys() {
    HashSet<String> s = new HashSet<String>();
    addKeys(s);
    return s;
  }

  /**
   * Adds all the keys in the json map to the given set.
   * @param s
   */
  private native void addKeys(HashSet<String> set) /*-{
    for (var key in this) {
      set.@java.util.HashSet::add(Ljava/lang/Object;)(key);
    }
  }-*/;

}