org.apache.xmlgraphics.image.loader.impl.ImageLoaderRawPNG Maven / Gradle / Ivy

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Tool to convert CSV and XLS to XML, to transform XML and to convert XML to CSV, HTML, other text files, PDF etc., useful as command line tool and integrated in other projects.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

/* $Id$ */

// Original author: Matthias Reichenbacher

package org.apache.xmlgraphics.image.loader.impl;

import java.io.IOException;
import java.util.Map;

import javax.imageio.stream.ImageInputStream;
import javax.xml.transform.Source;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.apache.xmlgraphics.image.codec.util.ImageInputStreamSeekableStreamAdapter;
import org.apache.xmlgraphics.image.codec.util.SeekableStream;
import org.apache.xmlgraphics.image.loader.Image;
import org.apache.xmlgraphics.image.loader.ImageException;
import org.apache.xmlgraphics.image.loader.ImageFlavor;
import org.apache.xmlgraphics.image.loader.ImageInfo;
import org.apache.xmlgraphics.image.loader.ImageSessionContext;
import org.apache.xmlgraphics.image.loader.util.ImageUtil;
import org.apache.xmlgraphics.io.XmlSourceUtil;
import org.apache.xmlgraphics.util.MimeConstants;

public class ImageLoaderRawPNG extends AbstractImageLoader {

    /** logger */
    protected static final Log log = LogFactory.getLog(ImageLoaderRawPNG.class);

    /**
     * Main constructor.
     */
    public ImageLoaderRawPNG() {
    }

    /** {@inheritDoc} */
    public ImageFlavor getTargetFlavor() {
        return ImageFlavor.RAW_PNG;
    }

    /** {@inheritDoc} */
    public Image loadImage(ImageInfo info, Map hints, ImageSessionContext session) throws ImageException,
            IOException {
        if (!MimeConstants.MIME_PNG.equals(info.getMimeType())) {
            throw new IllegalArgumentException("ImageInfo must be from a image with MIME type: "
                    + MimeConstants.MIME_PNG);
        }

        Source src = session.needSource(info.getOriginalURI());
        ImageInputStream in = ImageUtil.needImageInputStream(src);
        // Remove streams as we do things with them at some later time.
        XmlSourceUtil.removeStreams(src);
        SeekableStream seekStream = new ImageInputStreamSeekableStreamAdapter(in);
        PNGFile im = new PNGFile(seekStream);
        ImageRawPNG irpng = im.getImageRawPNG(info);
        return irpng;
    }

    /** {@inheritDoc} */
    public int getUsagePenalty() {
        // since this image loader does not handle all kinds of PNG images then we add some penalty to it
        // so that it is not chosen by default; instead, users need to give it a negative penalty in
        // fop.xconf so that it is used
        return 1000;
    }

}