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/*
* Copyright 1999-2005 The Apache Software Foundation.
*
* 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.
*/
/* $Id$ */
package org.apache.fop.image;
import org.apache.fop.apps.FOUserAgent;
/**
* Class to load images.
*/
class ImageLoader {
private String url;
private ImageCache cache;
private boolean valid = true;
private FOUserAgent userAgent;
private FopImage image = null;
/**
* Main constructor.
* @param url URL to the image
* @param cache Image cache
* @param ua User agent
*/
public ImageLoader(String url, ImageCache cache, FOUserAgent ua) {
this.url = url;
this.cache = cache;
this.userAgent = ua;
}
/**
* Loads the image.
* @return the loaded image
*/
public synchronized FopImage loadImage() {
if (!valid || image != null) {
return image;
}
image = ImageFactory.getInstance().loadImage(url, userAgent);
if (image == null) {
cache.invalidateImage(url, userAgent);
valid = false;
}
return image;
}
}
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