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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;
// FOP
import org.apache.fop.apps.FOUserAgent;
/**
* Image cache holder.
* This interface is used for caching images.
*/
public interface ImageCache {
/**
* Get an image from the cache.
*
* @param url the url and key for the image
* @param context the user agent context
* @return the requested image
*/
FopImage getImage(String url, FOUserAgent context);
/**
* Release an image in the current context.
*
* @param url the url and key for the image
* @param context the user agent context
*/
void releaseImage(String url, FOUserAgent context);
/**
* Invalidate image.
* If during loading this image is found to be invalid
* it will be invalidated to prevent further attempts at
* loading the image.
*
* @param url the url and key for the image
* @param context the user agent context
*/
void invalidateImage(String url, FOUserAgent context);
/**
* Remove a context and handle all images in the context.
*
* @param context the user agent context
*/
void removeContext(FOUserAgent context);
/**
* Forces the cache to fully cleared.
*/
void clearAll();
}
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