GraphicHandler.java

/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2016 Open Source Geospatial Foundation (OSGeo)
 *    (C) 2014-2016 Boundless Spatial
 *    
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 */
package org.geotools.ysld.transform.sld;

import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import java.io.IOException;

/**
 * Handles xml parse events for {@link org.geotools.styling.Graphic} elements.
 */
public class GraphicHandler extends SldTransformHandler {
    boolean inSymbols = false;

    @Override
    public void element(XMLStreamReader xml, SldTransformContext context)
            throws XMLStreamException, IOException {
        String name = xml.getLocalName();
        if ("Graphic".equals(name)) {
            context.mapping();
        } else if ("Mark".equals(name) || "ExternalGraphic".equals(name)) {
            context.scalar("symbols").sequence().push(new SymbolsHandler());
        } else if ("Size".equals(name) || "Opacity".equals(name) || "Rotation".equals(name)) {
            context.scalar(name.toLowerCase()).push(new ExpressionHandler());
        } else if ("Displacment".equals(name) || "AnchorPoint".equals(name)) {
            // context.scalar(name.toLowerCase()).push(new TupleHandler());
        }
    }

    @Override
    public void endElement(XMLStreamReader xml, SldTransformContext context)
            throws XMLStreamException, IOException {
        String name = xml.getLocalName();
        if ("Graphic".equals(name)) {
            context.endMapping().pop();
        }

    }

    static class SymbolsHandler extends SldTransformHandler {
        @Override
        public void element(XMLStreamReader xml, SldTransformContext context)
                throws XMLStreamException, IOException {
            String name = xml.getLocalName();
            if ("Mark".equals(name)) {
                context.push(new MarkHandler());
            } else if ("ExternalGraphic".equals(name)) {
                context.push(new ExternalHandler());
            } else {
                context.endSequence().pop();
            }
        }
    }

    static class MarkHandler extends SldTransformHandler {
        @Override
        public void element(XMLStreamReader xml, SldTransformContext context)
                throws XMLStreamException, IOException {
            String name = xml.getLocalName();
            if ("Mark".equals(name)) {
                context.mapping().scalar("mark").mapping();
            } else if ("WellKnownName".equals(name)) {
                context.scalar("shape").push(new ExpressionHandler());
            } else if ("Stroke".equals(name)) {
                context.push(new StrokeHandler());
            } else if ("Fill".equals(name)) {
                context.push(new FillHandler());
            }
            // TODO: se:OnlineResource
            // TODO: se:InlineContent
        }

        @Override
        public void endElement(XMLStreamReader xml, SldTransformContext context)
                throws XMLStreamException, IOException {
            if ("Mark".equals(xml.getLocalName())) {
                context.endMapping().endMapping().pop();
            }
        }
    }

    static class ExternalHandler extends SldTransformHandler {
        @Override
        public void element(XMLStreamReader xml, SldTransformContext context)
                throws XMLStreamException, IOException {
            String name = xml.getLocalName();
            if ("ExternalGraphic".equals(name)) {
                context.mapping().scalar("external").mapping();
            } else if ("OnlineResource".equals(name)) {
                context.scalar("url").scalar(xml.getAttributeValue(null, "href"));
            } else if ("Format".equals(name)) {
                context.scalar("format").scalar(xml.getElementText());
            }
        }

        @Override
        public void endElement(XMLStreamReader xml, SldTransformContext context)
                throws XMLStreamException, IOException {
            if ("ExternalGraphic".equals(xml.getLocalName())) {
                context.endMapping().endMapping().pop();
            }
        }
    }
}