/*
 * Copyright 2007 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.libideas.resources.client.impl;

import com.google.gwt.libideas.resources.client.ImageResource;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.impl.ClippedImagePrototype;

/**
 * This is part of an implementation of the ImageBundle optimization implemented
 * with ImmutableResourceBundle.
 */
public class ImageResourcePrototype implements ImageResource {

  private final String name;
  private final String url;
  private final int left;
  private final int top;
  private final int width;
  private final int height;
  private ClippedImagePrototype clippedImage;

  public ImageResourcePrototype(String name, String url, int left, int top,
      int width, int height) {
    this.name = name;
    this.left = left;
    this.top = top;
    this.height = height;
    this.width = width;
    this.url = url;
  }

  public void applyTo(Image image) {
    ensureImage();
    clippedImage.applyTo(image);
  }

  public Image createImage() {
    ensureImage();
    return clippedImage.createImage();
  }

  /**
   * Exists for testing purposes, not part of the ImageResource interface.
   */
  public int getHeight() {
    return height;
  }

  public String getHTML() {
    ensureImage();
    return clippedImage.getHTML();
  }

  /**
   * Exists for testing purposes, not part of the ImageResource interface.
   */
  public int getLeft() {
    return left;
  }

  public String getName() {
    return name;
  }

  /**
   * Exists for testing purposes, not part of the ImageResource interface.
   */
  public int getTop() {
    return top;
  }

  /**
   * Exists for testing purposes, not part of the ImageResource interface.
   */
  public String getURL() {
    return url;
  }

  /**
   * Exists for testing purposes, not part of the ImageResource interface.
   */
  public int getWidth() {
    return width;
  }

  private void ensureImage() {
    if (clippedImage == null) {
      clippedImage = new ClippedImagePrototype(url, left, top, width, height);
    }
  }
}