/*
* SVGLoader.java
*
*
* The Salamander Project - 2D and 3D graphics libraries in Java
* Copyright (C) 2004 Mark McKay
*
* 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; either
* version 2.1 of the License, or (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Mark McKay can be contacted at mark@kitfox.com. Salamander and other
* projects can be found at http://www.kitfox.com
*
* Created on February 18, 2004, 5:09 PM
*/
package com.kitfox.svg;
import java.util.*;
import java.net.*;
import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;
import com.kitfox.svg.animation.*;
/**
* @author Mark McKay
* @author <a href="mailto:mark@kitfox.com">Mark McKay</a>
*/
public class SVGLoader extends DefaultHandler
{
final HashMap nodeClasses = new HashMap();
//final HashMap attribClasses = new HashMap();
final LinkedList buildStack = new LinkedList();
final HashSet ignoreClasses = new HashSet();
final SVGLoaderHelper helper;
/**
* The diagram that represents the base of this SVG document we're loading.
* Will be augmented to include node indexing info and other useful stuff.
*/
final SVGDiagram diagram;
// SVGElement loadRoot;
//Used to keep track of document elements that are not part of the SVG namespace
int skipNonSVGTagDepth = 0;
int indent = 0;
final boolean verbose;
/** Creates a new instance of SVGLoader */
public SVGLoader(URI xmlBase, SVGUniverse universe)
{
this(xmlBase, universe, false);
}
public SVGLoader(URI xmlBase, SVGUniverse universe, boolean verbose)
{
this.verbose = verbose;
diagram = new SVGDiagram(xmlBase, universe);
//Compile a list of important builder classes
nodeClasses.put("a", A.class);
nodeClasses.put("animate", Animate.class);
nodeClasses.put("animatecolor", AnimateColor.class);
nodeClasses.put("animatemotion", AnimateMotion.class);
nodeClasses.put("animatetransform", AnimateTransform.class);
nodeClasses.put("circle", Circle.class);
nodeClasses.put("clippath", ClipPath.class);
nodeClasses.put("defs", Defs.class);
nodeClasses.put("desc", Desc.class);
nodeClasses.put("ellipse", Ellipse.class);
nodeClasses.put("filter", Filter.class);
nodeClasses.put("font", Font.class);
nodeClasses.put("font-face", FontFace.class);
nodeClasses.put("g", Group.class);
nodeClasses.put("glyph", Glyph.class);
nodeClasses.put("hkern", Hkern.class);
nodeClasses.put("image", ImageSVG.class);
nodeClasses.put("line", Line.class);
nodeClasses.put("lineargradient", LinearGradient.class);
nodeClasses.put("marker", Marker.class);
nodeClasses.put("metadata", Metadata.class);
nodeClasses.put("missing-glyph", MissingGlyph.class);
nodeClasses.put("path", Path.class);
nodeClasses.put("pattern", PatternSVG.class);
nodeClasses.put("polygon", Polygon.class);
nodeClasses.put("polyline", Polyline.class);
nodeClasses.put("radialgradient", RadialGradient.class);
nodeClasses.put("rect", Rect.class);
nodeClasses.put("set", SetSmil.class);
nodeClasses.put("shape", ShapeElement.class);
nodeClasses.put("stop", Stop.class);
nodeClasses.put("style", Style.class);
nodeClasses.put("svg", SVGRoot.class);
nodeClasses.put("symbol", Symbol.class);
nodeClasses.put("text", Text.class);
nodeClasses.put("title", Title.class);
nodeClasses.put("tspan", Tspan.class);
nodeClasses.put("use", Use.class);
ignoreClasses.add("midpointstop");
//attribClasses.put("clip-path", StyleUrl.class);
//attribClasses.put("color", StyleColor.class);
helper = new SVGLoaderHelper(xmlBase, universe, diagram);
}
private String printIndent(int indent, String indentStrn)
{
StringBuffer sb = new StringBuffer();
for (int i = 0; i < indent; i++)
{
sb.append(indentStrn);
}
return sb.toString();
}
public void startDocument() throws SAXException
{
// System.err.println("Start doc");
// buildStack.clear();
}
public void endDocument() throws SAXException
{
// System.err.println("End doc");
}
public void startElement(String namespaceURI, String sName, String qName, Attributes attrs) throws SAXException
{
if (verbose)
{
System.err.println(printIndent(indent, " ") + "Starting parse of tag " + sName+ ": " + namespaceURI);
}
indent++;
if (skipNonSVGTagDepth != 0 || (!namespaceURI.equals("") && !namespaceURI.equals(SVGElement.SVG_NS)))
{
skipNonSVGTagDepth++;
return;
}
sName = sName.toLowerCase();
//javax.swing.JOptionPane.showMessageDialog(null, sName);
Object obj = nodeClasses.get(sName);
if (obj == null)
{
if (!ignoreClasses.contains(sName))
{
if (verbose)
{
System.err.println("SVGLoader: Could not identify tag '" + sName + "'");
}
}
return;
}
//Debug info tag depth
//for (int i = 0; i < buildStack.size(); i++) System.err.print(" ");
//System.err.println("+" + sName);
try {
Class cls = (Class)obj;
SVGElement svgEle = (SVGElement)cls.newInstance();
SVGElement parent = null;
if (buildStack.size() != 0) parent = (SVGElement)buildStack.getLast();
svgEle.loaderStartElement(helper, attrs, parent);
buildStack.addLast(svgEle);
}
catch (Exception e)
{
e.printStackTrace();
throw new SAXException(e);
}
}
public void endElement(String namespaceURI, String sName, String qName)
throws SAXException
{
indent--;
if (verbose)
{
System.err.println(printIndent(indent, " ") + "Ending parse of tag " + sName+ ": " + namespaceURI);
}
if (skipNonSVGTagDepth != 0)
{
skipNonSVGTagDepth--;
return;
}
sName = sName.toLowerCase();
Object obj = nodeClasses.get(sName);
if (obj == null) return;
//Debug info tag depth
//for (int i = 0; i < buildStack.size(); i++) System.err.print(" ");
//System.err.println("-" + sName);
try {
SVGElement svgEle = (SVGElement)buildStack.removeLast();
svgEle.loaderEndElement(helper);
SVGElement parent = null;
if (buildStack.size() != 0)
{
parent = (SVGElement)buildStack.getLast();
}
//else loadRoot = (SVGElement)svgEle;
if (parent != null)
{
parent.loaderAddChild(helper, svgEle);
}
else
{
diagram.setRoot((SVGRoot)svgEle);
}
}
catch (Exception e)
{
e.printStackTrace();
throw new SAXException(e);
}
}
public void characters(char buf[], int offset, int len)
throws SAXException
{
if (skipNonSVGTagDepth != 0)
{
return;
}
if (buildStack.size() != 0)
{
SVGElement parent = (SVGElement)buildStack.getLast();
String s = new String(buf, offset, len);
parent.loaderAddText(helper, s);
}
}
public void processingInstruction(String target, String data)
throws SAXException
{
//Check for external style sheet
}
// public SVGElement getLoadRoot() { return loadRoot; }
public SVGDiagram getLoadedDiagram() { return diagram; }
}
