/*
* Created on 20/set/2011
* Copyright 2011 by Andrea Vacondio (andrea.vacondio@gmail.com).
*
* This file is part of the Sejda source code
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.sejda.core.writer.context;
import static java.util.Objects.isNull;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.Map;
import org.sejda.core.writer.imageio.JpegImageWriter;
import org.sejda.core.writer.imageio.PngImageWriter;
import org.sejda.core.writer.imageio.TiffMultiImageWriter;
import org.sejda.core.writer.imageio.TiffSingleImageWriter;
import org.sejda.core.writer.model.ImageWriter;
import org.sejda.model.exception.TaskException;
import org.sejda.model.exception.TaskExecutionException;
import org.sejda.model.parameter.image.PdfToImageParameters;
import org.sejda.model.parameter.image.PdfToJpegParameters;
import org.sejda.model.parameter.image.PdfToMultipleTiffParameters;
import org.sejda.model.parameter.image.PdfToPngParameters;
import org.sejda.model.parameter.image.PdfToSingleTiffParameters;
/**
* Image Writer Context used to get the proper {@link ImageWriter}.
*
* @author Andrea Vacondio
*
*/
public final class ImageWriterContext {
private static final Map<Class<? extends PdfToImageParameters>, Class<? extends ImageWriter<?>>> BUILDERS_REGISTRY = new HashMap<>();
static {
BUILDERS_REGISTRY.put(PdfToMultipleTiffParameters.class, TiffSingleImageWriter.class);
BUILDERS_REGISTRY.put(PdfToSingleTiffParameters.class, TiffMultiImageWriter.class);
BUILDERS_REGISTRY.put(PdfToJpegParameters.class, JpegImageWriter.class);
BUILDERS_REGISTRY.put(PdfToPngParameters.class, PngImageWriter.class);
}
public static ImageWriterContext getContext() {
return ImageContextHolder.IMAGE_WRITER_CONTEXT;
}
@SuppressWarnings("unchecked")
public <T extends PdfToImageParameters> ImageWriter<T> createImageWriter(T params) throws TaskException {
Class<? extends ImageWriter<?>> writer = BUILDERS_REGISTRY.get(params.getClass());
if (isNull(writer)) {
throw new TaskExecutionException(String.format("No suitable ImageWriter found for %s", params));
}
try {
return ImageWriter.class.cast(writer.getConstructor().newInstance());
} catch (NoSuchMethodException | SecurityException | InstantiationException | IllegalAccessException
| IllegalArgumentException | InvocationTargetException e) {
throw new TaskException("Unable to create ImageWriter", e);
}
}
/**
* Lazy initialization holder class
*
* @author Andrea Vacondio
*
*/
private static final class ImageContextHolder {
private ImageContextHolder() {
// hide constructor
}
static final ImageWriterContext IMAGE_WRITER_CONTEXT = new ImageWriterContext();
}
}