Load tileset descriptions from an XML file.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@57 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/media/tile/XMLTileSetParser.java

@@ -0,0 +1,118 @@
+//
+// $Id: XMLTileSetParser.java,v 1.1 2001/07/17 17:21:33 shaper Exp $
+
+package com.threerings.cocktail.miso.tile;
+
+import com.threerings.cocktail.miso.Log;
+
+import com.samskivert.util.StringUtil;
+
+import org.xml.sax.*;
+import org.xml.sax.helpers.DefaultHandler;
+import org.xml.sax.helpers.XMLReaderFactory;
+
+import java.io.*;
+import javax.xml.parsers.*;
+import java.util.ArrayList;
+
+/**
+ * Parse an XML tileset description file and construct tileset objects
+ * for each valid description.  Does not currently perform validation
+ * on the input XML stream, though the parsing code assumes the XML
+ * document is well-formed.
+ */
+public class XMLTileSetParser extends DefaultHandler
+    implements TileSetParser
+{
+    public void startElement (String uri, String localName,
+			      String qName, Attributes attributes)
+    {
+	_tag = qName;
+    }
+
+    public void endElement (String uri, String localName, String qName)
+    {
+	// construct the tileset object on tag close
+	if (qName.equals("tileset")) {
+	    TileSet tset = new TileSet(
+		_tsName, _tsTsid, _tsImgFile, _tsRowHeight, _tsTileCount);
+	    _tilesets.add(tset);
+	}
+
+	// note that we're not within a tag to avoid considering any
+	// characters during this quiescent time
+	_tag = null;
+    }
+
+    public void characters (char ch[], int start, int length)
+    {
+	// bail if we're not within a meaningful tag
+	if (_tag == null) return;
+
+  	String str = String.copyValueOf(ch, start, length);
+
+	// store the value associated with the current tag for use
+	// when we construct the tileset object.
+	if (_tag.equals("name")) {
+	    _tsName = str;
+
+	} else if (_tag.equals("tsid")) {
+	    try {
+		_tsTsid = Integer.parseInt(str);
+	    } catch (NumberFormatException nfe) {
+		Log.warning("Malformed integer tilesetid [str=" + str + "].");
+		_tsTsid = -1;
+	    }
+
+	} else if (_tag.equals("imagefile")) {
+	    _tsImgFile = str;
+
+	} else if (_tag.equals("rowheight")) {
+	    _tsRowHeight = StringUtil.parseIntArray(str);
+
+	} else if (_tag.equals("tilecount")) {
+	    _tsTileCount = StringUtil.parseIntArray(str);
+	}
+    }
+
+    public void loadTileSets (InputStream tis) throws IOException
+    {
+    	try {
+	    XMLReader xr = _pfactory.newSAXParser().getXMLReader();
+
+	    xr.setContentHandler(this);
+	    xr.setErrorHandler(this);
+
+	    xr.parse(new InputSource(tis));
+
+	} catch (ParserConfigurationException pce) {
+  	    throw new IOException(pce.toString());
+
+	} catch (SAXException saxe) {
+	    throw new IOException(saxe.toString());
+	}
+    }
+
+    public ArrayList getTileSets ()
+    {
+	if (_tilesets.size() == 0) return null;
+	return _tilesets;
+    }
+
+    protected String _tag;
+    protected ArrayList _tilesets = new ArrayList();
+
+    // temporary storage of tileset object values
+    protected String _tsName;
+    protected int    _tsTsid;
+    protected String _tsImgFile;
+    protected int[]  _tsRowHeight, _tsTileCount;
+
+    // the slithy tove from whence came the XMLReader object
+    protected static SAXParserFactory _pfactory;
+
+    static {
+	_pfactory = SAXParserFactory.newInstance();
+	_pfactory.setValidating(false);
+    }
+}