/*
* Copyright 2006-2017 ICEsoft Technologies Canada Corp.
*
* 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.icepdf.core.pobjects.graphics;
import org.icepdf.core.pobjects.ImageStream;
import org.icepdf.core.pobjects.Page;
import org.icepdf.core.pobjects.Resources;
import java.awt.image.BufferedImage;
/**
* the Abstract CachedImageReference stores the decoded BufferedImage data in
* an ImagePool referenced by the images PDF object number to insure that if
* a page is garbage collected the image can re fetched from the pool if
* necessary.
*
* @since 5.0
*/
public abstract class CachedImageReference extends ImageReference {
private ImagePool imagePool;
private boolean isNull;
protected CachedImageReference(ImageStream imageStream, GraphicsState graphicsState,
Resources resources, int imageIndex,
Page page) {
super(imageStream, graphicsState, resources, imageIndex, page);
imagePool = imageStream.getLibrary().getImagePool();
this.reference = imageStream.getPObjectReference();
}
public BufferedImage getImage() throws InterruptedException {
if (isNull) {
return null;
}
if (image != null && reference != null) {
imagePool.put(reference, image);
return image;
}
BufferedImage cached = imagePool.get(reference);
if (cached != null) {
return cached;
} else {
BufferedImage im = createImage();
if (im != null && reference != null) {
imagePool.put(reference, im);
} else if (reference != null) {
isNull = true;
}
return im;
}
}
}