ch.bergturbenthal.hs485.frontend.gwtfrontend.client.svg.SVGProcessor.java Source code

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Here is the source code for ch.bergturbenthal.hs485.frontend.gwtfrontend.client.svg.SVGProcessor.java

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/**********************************************
 * Copyright (C) 2010 Lukas Laag
 * This file is part of vectomatic2.
 * 
 * vectomatic2 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * vectomatic2 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with vectomatic2.  If not, see http://www.gnu.org/licenses/
 **********************************************/
package ch.bergturbenthal.hs485.frontend.gwtfrontend.client.svg;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.vectomatic.dom.svg.OMSVGElement;
import org.vectomatic.dom.svg.impl.Attr;
import org.vectomatic.dom.svg.impl.NamedNodeMap;
import org.vectomatic.dom.svg.utils.DOMHelper;
import org.vectomatic.dom.svg.utils.SVGConstants;

import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Node;
import com.google.gwt.dom.client.NodeList;

/**
 * Class to normalize id and idrefs in an SVG document
 * 
 * @author laaglu
 */
public class SVGProcessor {
    static int docId;

    public static void main(final String[] args) {
        for (final String arg : args) {
            final IdRefTokenizer tokenizer = new IdRefTokenizer();
            final StringBuilder builder = new StringBuilder();
            tokenizer.tokenize(arg);
            IdRefTokenizer.IdRefToken token;
            while ((token = tokenizer.nextToken()) != null) {
                final String txt = token.getKind() == IdRefTokenizer.IdRefToken.DATA ? token.getValue()
                        : "{" + token.getValue() + "}";
                builder.append(txt);
            }
            System.out.println("\"" + arg + "\" ==> \"" + builder.toString() + "\"");
        }
    }

    public static int normalizeIds(final OMSVGElement srcSvg) {
        docId++;
        // Collect all the original element ids and replace them with a
        // normalized id
        int idIndex = 0;
        final Map<String, Element> idToElement = new HashMap<String, Element>();
        final Map<String, String> idToNormalizedId = new HashMap<String, String>();
        final List<Element> queue = new ArrayList<Element>();
        queue.add(srcSvg.getElement());
        while (queue.size() > 0) {
            final Element element = queue.remove(0);
            final String id = element.getId();
            if (id != null) {
                idToElement.put(id, element);
                final String normalizedId = "d" + docId + "_" + idIndex++;
                idToNormalizedId.put(id, normalizedId);
                element.setId(normalizedId);
            }
            final NodeList<Node> childNodes = element.getChildNodes();
            for (int i = 0, length = childNodes.getLength(); i < length; i++) {
                final Node childNode = childNodes.getItem(i);
                if (childNode.getNodeType() == Node.ELEMENT_NODE)
                    queue.add((Element) childNode.cast());
            }
        }

        // Change all the attributes which are URI references
        final Set<String> attNames = new HashSet<String>(Arrays.asList(new String[] { "clip-path", "mask",
                "marker-start", "marker-mid", "marker-end", "fill", "stroke", "filter", "cursor", "style" }));
        queue.add(srcSvg.getElement());
        final IdRefTokenizer tokenizer = GWT.create(IdRefTokenizer.class);
        while (queue.size() > 0) {
            final Element element = queue.remove(0);
            if (DOMHelper.hasAttributeNS(element, SVGConstants.XLINK_NAMESPACE_URI,
                    SVGConstants.XLINK_HREF_ATTRIBUTE)) {
                final String idRef = DOMHelper.getAttributeNS(element, SVGConstants.XLINK_NAMESPACE_URI,
                        SVGConstants.XLINK_HREF_ATTRIBUTE).substring(1);
                final String normalizeIdRef = idToNormalizedId.get(idRef);
                DOMHelper.setAttributeNS(element, SVGConstants.XLINK_NAMESPACE_URI,
                        SVGConstants.XLINK_HREF_ATTRIBUTE, "#" + normalizeIdRef);
            }
            final NamedNodeMap<Attr> attrs = DOMHelper.getAttributes(element);
            for (int i = 0, length = attrs.getLength(); i < length; i++) {
                final Attr attr = attrs.item(i);
                if (attNames.contains(attr.getName())) {
                    final StringBuilder builder = new StringBuilder();
                    tokenizer.tokenize(attr.getValue());
                    IdRefTokenizer.IdRefToken token;
                    while ((token = tokenizer.nextToken()) != null) {
                        String value = token.getValue();
                        if (token.getKind() == IdRefTokenizer.IdRefToken.DATA)
                            builder.append(value);
                        else {
                            value = idToNormalizedId.get(value);
                            builder.append(value == null ? token.getValue() : value);
                        }
                    }
                    attr.setValue(builder.toString());
                }
            }
            final NodeList<Node> childNodes = element.getChildNodes();
            for (int i = 0, length = childNodes.getLength(); i < length; i++) {
                final Node childNode = childNodes.getItem(i);
                if (childNode.getNodeType() == Node.ELEMENT_NODE)
                    queue.add((Element) childNode.cast());
            }
        }
        return docId;
    }
}