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codeparrot

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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.tools.doclets.internal.toolkit.builders;
import com.sun.tools.doclets.internal.toolkit.*;
import com.sun.tools.doclets.internal.toolkit.util.*;
import java.io.*;
import java.util.*;
import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;
import javax.xml.parsers.*;
/**
* Parse the XML that specified the order of operation for the builders. This
* Parser uses SAX parsing.
*
* @author Jamie Ho
* @since 1.5
* @see SAXParser
*/
public class LayoutParser extends DefaultHandler {
/**
* The map of XML elements that have been parsed.
*/
private Map<String, XMLNode> xmlElementsMap;
private XMLNode currentNode;
private Configuration configuration;
private static LayoutParser instance;
private String currentRoot;
private boolean isParsing;
/**
* This class is a singleton.
*/
private LayoutParser(Configuration configuration) {
xmlElementsMap = new HashMap<String, XMLNode>();
this.configuration = configuration;
}
/**
* Return an instance of the BuilderXML.
*
* @param configuration
* the current configuration of the doclet.
* @return an instance of the BuilderXML.
*/
public static LayoutParser getInstance(Configuration configuration) {
if (instance == null) {
instance = new LayoutParser(configuration);
}
return instance;
}
/**
* Parse the XML specifying the layout of the documentation.
*
* @return the list of XML elements parsed.
*/
public XMLNode parseXML(String root) {
if (xmlElementsMap.containsKey(root)) {
return xmlElementsMap.get(root);
}
try {
currentRoot = root;
isParsing = false;
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser saxParser = factory.newSAXParser();
InputStream in = configuration.getBuilderXML();
saxParser.parse(in, this);
return xmlElementsMap.get(root);
} catch (Throwable t) {
t.printStackTrace();
throw new DocletAbortException();
}
}
/**
* {@inheritDoc}
*/
@Override
public void startElement(String namespaceURI, String sName, String qName,
Attributes attrs) throws SAXException {
if (isParsing || qName.equals(currentRoot)) {
isParsing = true;
currentNode = new XMLNode(currentNode, qName);
for (int i = 0; i < attrs.getLength(); i++)
currentNode.attrs.put(attrs.getLocalName(i), attrs.getValue(i));
if (qName.equals(currentRoot))
xmlElementsMap.put(qName, currentNode);