com.google.collide.client.util.JsIntegerMap.java Source code

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Here is the source code for com.google.collide.client.util.JsIntegerMap.java

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// Copyright 2012 Google Inc. All Rights Reserved.
//
// 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.google.collide.client.util;

import com.google.collide.json.client.JsoArray;
import com.google.collide.json.shared.JsonIntegerMap;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JsArrayNumber;

/**
 * Creates a lightweight map with integer keys based on a JavaScript object.
 *
 * @param <T> the type contained as value in the map
 */
public class JsIntegerMap<T> extends JavaScriptObject implements JsonIntegerMap<T> {

    /**
     * Create a new empty map.
     *
     * @param <T> the type of values to be stored in the map
     * @return an empty map
     */
    public static native <T> JsIntegerMap<T> create() /*-{
                                                      return {};
                                                      }-*/;

    protected JsIntegerMap() {
    }

    /**
     * Removes the mapping for this key from the map.
     *
     * @param key
     */
    @Override
    public final native void erase(int key) /*-{
                                            delete this[key];
                                            }-*/;

    /**
     * Returns the value associated with the specified key.
     *
     * @param key
     * @return the value associated with the key
     */
    @Override
    public final native T get(int key) /*-{
                                       return this[key];
                                       }-*/;

    /**
     * Removes and returns the value associated with the specified key.
     */
    public final T remove(int key) {
        T value = get(key);
        erase(key);
        return value;
    }

    /**
     * Returns an array containing all the values in this map.
     *
     * @return a snapshot of the values contained in the map
     */
    public final native JsArrayNumber getKeys() /*-{
                                                var data = [];
                                                for (var prop in this) {
                                                var val = Number(prop);
                                                if (!isNaN(val)) {
                                                data.push(val);
                                                }
                                                }
                                                return data;
                                                }-*/;

    /**
     * Returns an array containing all the values in this map.
     *
     * @return a snapshot of the values contained in the map
     */
    public final native JsoArray<T> getValues() /*-{
                                                var data = [];
                                                for (var i in this) {
                                                if (this.hasOwnProperty(i)) {
                                                data.push(this[i]);
                                                }
                                                }
                                                return data;
                                                }-*/;

    /**
     * Returns true if this map has an entry for the specified key.
     *
     * @param key
     * @return true if this map has an entry for the given key
     */
    @Override
    public final native boolean hasKey(int key) /*-{
                                                return this.hasOwnProperty(key);
                                                }-*/;

    @Override
    public final native void iterate(JsonIntegerMap.IterationCallback<T> cb) /*-{
                                                                             for (var key in this) {
                                                                             if (this.hasOwnProperty(key)) {
                                                                             cb.
                                                                             @com.google.collide.json.shared.JsonIntegerMap.IterationCallback::onIteration(ILjava/lang/Object;)
                                                                             (parseInt(key),this[key]);
                                                                             }
                                                                             }
                                                                             }-*/;

    /**
     * Associates the specified value with the specified key in this map.
     *
     * @param key key with which the value will be associated
     * @param val value to be associated with key
     */
    @Override
    public final native void put(int key, T val) /*-{
                                                 this[key] = val;
                                                 }-*/;

    @Override
    public final native boolean isEmpty() /*-{
                                          for (var i in this) {
                                          if (this.hasOwnProperty(i)) {
                                          return false;
                                          }
                                          }
                                              
                                          return true;
                                          }-*/;
}