fop/fop-core/src/main/java/org/apache/fop/render/afp/AFPImageHandlerRawCCITTFax.java

/*
 * 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.
 */

/* $Id$ */

package org.apache.fop.render.afp;

import java.awt.Rectangle;
import java.io.IOException;

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

import org.apache.xmlgraphics.image.loader.Image;
import org.apache.xmlgraphics.image.loader.ImageFlavor;
import org.apache.xmlgraphics.image.loader.impl.ImageRawCCITTFax;
import org.apache.xmlgraphics.image.loader.impl.ImageRawStream;
import org.apache.xmlgraphics.util.MimeConstants;

import org.apache.fop.afp.AFPDataObjectInfo;
import org.apache.fop.afp.AFPImageObjectInfo;
import org.apache.fop.render.RenderingContext;

/**
 * AFPImageHandler implementation which handles CCITT encoded images (CCITT fax group 3/4).
 */
public class AFPImageHandlerRawCCITTFax extends AbstractAFPImageHandlerRawStream {

    private static final ImageFlavor[] FLAVORS = new ImageFlavor[] {
        ImageFlavor.RAW_CCITTFAX,
    };

    /** logging instance */
    private final Log log = LogFactory.getLog(AFPImageHandlerRawJPEG.class);

    /** {@inheritDoc} */
    @Override
    protected void setAdditionalParameters(AFPDataObjectInfo dataObjectInfo,
            ImageRawStream image) {
        AFPImageObjectInfo imageObjectInfo = (AFPImageObjectInfo)dataObjectInfo;
        ImageRawCCITTFax ccitt = (ImageRawCCITTFax)image;
        int compression = ccitt.getCompression();
        imageObjectInfo.setCompression(compression);

        imageObjectInfo.setBitsPerPixel(1);

        //CCITTFax flavor doesn't have TIFF associated but the AFP library listens to
        //that to identify CCITT encoded images. CCITT is not exclusive to TIFF.
        imageObjectInfo.setMimeType(MimeConstants.MIME_TIFF);
    }

    /** {@inheritDoc} */
    @Override
    public void handleImage(RenderingContext context, Image image, Rectangle pos)
            throws IOException {
        log.debug("Embedding undecoded CCITT data as data container...");
        super.handleImage(context, image, pos);
    }

    /** {@inheritDoc} */
    @Override
    protected AFPDataObjectInfo createDataObjectInfo() {
        return new AFPImageObjectInfo();
    }

    /** {@inheritDoc} */
    public int getPriority() {
        return 400;
    }

    /** {@inheritDoc} */
    public Class getSupportedImageClass() {
        return ImageRawCCITTFax.class;
    }

    /** {@inheritDoc} */
    public ImageFlavor[] getSupportedImageFlavors() {
        return FLAVORS;
    }

    /** {@inheritDoc} */
    public boolean isCompatible(RenderingContext targetContext, Image image) {
        if (targetContext instanceof AFPRenderingContext) {
            AFPRenderingContext afpContext = (AFPRenderingContext)targetContext;
            return (afpContext.getPaintingState().isNativeImagesSupported())
                && (image == null || image instanceof ImageRawCCITTFax);
        }
        return false;
    }

}