JsoIntegerMap.java

// 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 org.eclipse.che.ide.collections.js;

import org.eclipse.che.ide.collections.IntegerMap;
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 JsoIntegerMap<T> extends JavaScriptObject implements IntegerMap<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> JsoIntegerMap<T> create() /*-{
        return {};
    }-*/;

    protected JsoIntegerMap() {
    }

    /**
     * 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(IntegerMap.IterationCallback<T> cb) /*-{
        for (var key in this) {
            if (this.hasOwnProperty(key)) {
                cb.
                    @org.eclipse.che.ide.collections.IntegerMap.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;
    }-*/;
}