fop/examples/mathml/src/org/apache/fop/mathml/ImageLoaderMathML.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.mathml;

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

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.impl.AbstractImageLoader;
import org.apache.xmlgraphics.image.loader.impl.ImageGraphics2D;

/**
 * ImageLoader for MathML (using JEuclid).
 */
public class ImageLoaderMathML extends AbstractImageLoader {

    private ImageFlavor targetFlavor;

    /**
     * Main constructor.
     * @param targetFlavor the target flavor
     */
    public ImageLoaderMathML(ImageFlavor targetFlavor) {
        if (!(ImageFlavor.GRAPHICS2D.equals(targetFlavor))) {
            throw new IllegalArgumentException("Unsupported target ImageFlavor: " + targetFlavor);
        }
        this.targetFlavor = targetFlavor;
    }

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

    /** {@inheritDoc} */
    public Image loadImage(ImageInfo info, Map hints, ImageSessionContext session)
                throws ImageException, IOException {
        if (!ImageLoaderFactoryMathML.MIME_MATHML.equals(info.getMimeType())) {
            throw new IllegalArgumentException("ImageInfo must be from an MathML image");
        }
        Image img = info.getOriginalImage();
        if (!(img instanceof ImageGraphics2D)) {
            throw new IllegalArgumentException(
                    "ImageInfo was expected to contain the MathML document as Graphics2D image");
        }
        ImageGraphics2D g2dImage = (ImageGraphics2D)img;
        return g2dImage;
    }

}