/*
* Created on 02 feb 2017
* Copyright 2015 by Andrea Vacondio (andrea.vacondio@gmail.com).
* This file is part of Sejda.
*
* Sejda is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Sejda is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Sejda. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sejda.core.writer.imageio;
import static java.util.Objects.nonNull;
import java.awt.image.RenderedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.IIOImage;
import javax.imageio.ImageWriteParam;
import org.sejda.model.exception.TaskIOException;
import org.sejda.model.parameter.image.PdfToImageParameters;
/**
* Abstract implementation of an image writer that supports writing multiple images into a single file using ImageIO
*
* @author Andrea Vacondio
*/
abstract class MultiImageWriter<T extends PdfToImageParameters> extends AbstractImageWriter<T> {
private boolean prepared = false;
private ImageWriteParam imageWriterParams;
MultiImageWriter(String format) {
super(format);
if (!writer.canWriteSequence()) {
throw new UnsupportedOperationException(
"The ImageWriter does not support writing multiple images to a single image file.");
}
}
@Override
public void openDestination(File file, T params) throws TaskIOException {
super.openDestination(file, params);
imageWriterParams = newImageWriterParams(params);
}
@Override
public void write(RenderedImage image, T params) throws TaskIOException {
TaskIOException.require(nonNull(getOutput()), "Cannot call write before opening the write destination");
try {
if (!prepared) {
writer.prepareWriteSequence(null);
prepared = true;
}
writer.writeToSequence(new IIOImage(image, null, newImageMetadata(image, params, imageWriterParams)),
imageWriterParams);
} catch (IOException e) {
throw new TaskIOException(e);
}
}
@Override
public void closeDestination() throws TaskIOException {
if (nonNull(writer)) {
try {
writer.endWriteSequence();
} catch (IOException e) {
throw new TaskIOException("An error occurred while ending write sequence", e);
}
}
super.closeDestination();
}
@Override
public boolean supportMultiImage() {
return true;
}
}