bikeshed/super/com/google/gwt/collections/super/com/google/gwt/collections/ImmutableArrayImpl.java

/*
 * Copyright 2009 Google Inc.
 * 
 * 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.gwt.collections;

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

/**
 * The standard JSNI implementation of an immutable array.
 * 
 * @param <E> The type stored in the array elements
 */
public class ImmutableArrayImpl<E> extends ImmutableArray<E> {

  final JsArray elems;

  ImmutableArrayImpl(JsArray elems) {
    Assertions.assertNotNull(elems);
    this.elems = elems;
  }

  @Override
  public E get(int index) {
    Assertions.assertIndexInRange(index, 0, size());
    return jsniGet(index);
  }

  @Override
  public int size() {
    return elems.length();
  }

  private native E jsniGet(int index) /*-{
    return this.@com.google.gwt.collections.ImmutableArrayImpl::elems[index];
  }-*/;

}