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Batik Java2D SVG generator
There is a newer version: 1.17
/*

   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.

 */
package org.apache.batik.svggen;

import java.awt.Composite;
import java.awt.Paint;
import java.awt.Rectangle;
import java.awt.image.BufferedImageOp;

/**
 * The ExtensionHandler interface allows the user to handle
 * Java 2D API extensions that map to SVG concepts (such as custom
 * Paints, Composites or BufferedImageOp filters).
 *
 * @author Vincent Hardy
 * @version $Id: ExtensionHandler.java 1733416 2016-03-03 07:07:13Z gadams $
 */
public interface ExtensionHandler {
    /**
     * @param paint Custom Paint to be converted to SVG
     * @param generatorContext allows the handler to build DOM objects as needed.
     * @return an SVGPaintDescriptor
     */
    SVGPaintDescriptor handlePaint(Paint paint,
                                          SVGGeneratorContext generatorContext);

    /**
     * @param composite Custom Composite to be converted to SVG.
     * @param generatorContext allows the handler to build DOM objects as needed.
     * @return an SVGCompositeDescriptor which contains a valid SVG filter,
     * or null if the composite cannot be handled
     *
     */
    SVGCompositeDescriptor handleComposite(Composite composite,
                                                  SVGGeneratorContext generatorContext);

/**
     * @param filter Custom filter to be converted to SVG.
     * @param filterRect Rectangle, in device space, that defines the area
     *        to which filtering applies. May be null, meaning that the
     *        area is undefined.
     * @param generatorContext allows the handler to build DOM objects as needed.
     * @return an SVGFilterDescriptor which contains a valid SVG filter,
     * or null if the composite cannot be handled
     */
SVGFilterDescriptor handleFilter(BufferedImageOp filter,
                                            Rectangle filterRect,
                                            SVGGeneratorContext generatorContext);
}