DecompressedPixelDataOutput.java

/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
 * Java(TM), hosted at https://github.com/gunterze/dcm4che.
 *
 * The Initial Developer of the Original Code is
 * Agfa Healthcare.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * See @authors listed below
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */
package org.dcm4chee.archive.wado;

import org.dcm4che3.data.Attributes;
import org.dcm4che3.imageio.codec.Decompressor;
import org.dcm4chee.task.ImageProcessingTaskTypes;
import org.dcm4chee.task.MemoryConsumingTask;
import org.dcm4chee.task.TaskType;
import org.dcm4chee.task.WeightWatcher;

import javax.imageio.stream.ImageInputStream;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.StreamingOutput;
import java.io.IOException;
import java.io.OutputStream;

/**
 * Streams decompressed pixel data.
 *
 * @author Gunter Zeilinger <gunterze@gmail.com>
 * @author Hermann Czedik-Eysenberg <hermann-agfa@czedik.net>
 */
public class DecompressedPixelDataOutput implements StreamingOutput {

    private final Attributes dataset;
    private final String tsuid;
    private final int frameIndex;
    private final WeightWatcher weightWatcher;

    public DecompressedPixelDataOutput(Attributes dataset, String tsuid, int frameIndex, WeightWatcher weightWatcher) {
        this.dataset = dataset;
        this.tsuid = tsuid;
        this.frameIndex = frameIndex;
        this.weightWatcher = weightWatcher;
    }

    @Override
    public void write(OutputStream output) throws IOException, WebApplicationException {
        try {
            weightWatcher.execute(new WriteDecompressedPixelDataTask(dataset, tsuid, frameIndex, output));
        } catch (Exception e) {
            if (e instanceof IOException)
                throw (IOException) e;
            else if (e instanceof RuntimeException)
                throw (RuntimeException) e;
            else
                throw new RuntimeException(e); // should not happen
        }
    }

    private static class WriteDecompressedPixelDataTask implements MemoryConsumingTask<Void> {
        private final int frameIndex;
        private OutputStream output;
        private Decompressor decompressor;

        public WriteDecompressedPixelDataTask(Attributes dataset, String tsuid, int frameIndex, OutputStream output) {
            this.frameIndex = frameIndex;
            this.output = output;

            decompressor = new Decompressor(dataset, tsuid);
        }

        @Override
        public TaskType getTaskType() {
            return ImageProcessingTaskTypes.TRANSCODE_OUTGOING;
        }

        @Override
        public long getEstimatedWeight() {
            return decompressor.getEstimatedNeededMemory();
        }

        @Override
        public Void call() throws IOException {
            try {
                if (frameIndex == -1) {
                    // all frames
                    decompressor.writeTo(output);
                } else {
                    // a specific frame
                    try (ImageInputStream iis = decompressor.createImageInputStream()) {
                        decompressor.writeFrameTo(iis, frameIndex, output);
                    }
                }
            } finally {
                decompressor.dispose();

                // remove reference to decompressor, to be able to free the memory
                decompressor = null;
            }
            return null;
        }
    }
}