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/*******************************************************************************
* Copyright (c) 2009 Tasktop Technologies and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Tasktop Technologies - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.p2.discovery.compatibility;
import java.io.IOException;
import java.io.Reader;
import org.eclipse.equinox.internal.p2.discovery.compatibility.Directory.Entry;
import org.eclipse.equinox.internal.p2.discovery.compatibility.util.DefaultSaxErrorHandler;
import org.eclipse.equinox.internal.p2.discovery.compatibility.util.IOWithCauseException;
import org.eclipse.osgi.util.NLS;
import org.xml.sax.*;
import org.xml.sax.helpers.XMLReaderFactory;
/**
* A parser for {@link Directory directories}.
*
* @author David Green
*/
public class DirectoryParser {
/**
* parse the contents of a directory. The caller must close the given reader.
*
* @param directoryContents
* the contents of the directory
* @return a directory with 0 or more entries
* @throws IOException
* if the directory cannot be read.
*/
public Directory parse(Reader directoryContents) throws IOException {
XMLReader xmlReader;
try {
xmlReader = XMLReaderFactory.createXMLReader();
} catch (SAXException e) {
throw new IOWithCauseException(e.getMessage(), e);
}
xmlReader.setErrorHandler(new DefaultSaxErrorHandler());
DirectoryContentHandler contentHandler = new DirectoryContentHandler();
xmlReader.setContentHandler(contentHandler);
try {
xmlReader.parse(new InputSource(directoryContents));
} catch (SAXException e) {
throw new IOWithCauseException(e.getMessage(), e);
}
if (contentHandler.directory == null) {
throw new IOException(Messages.DirectoryParser_no_directory);
}
return contentHandler.directory;
}
private class DirectoryContentHandler implements ContentHandler {
Directory directory;
public void characters(char[] ch, int start, int length) throws SAXException {
// ignore
}
public void endDocument() throws SAXException {
// ignore
}
public void endElement(String uri, String localName, String qName) throws SAXException {
// ignore
}
public void endPrefixMapping(String prefix) throws SAXException {
// ignore
}
public void ignorableWhitespace(char[] ch, int start, int length) throws SAXException {
// ignore
}
public void processingInstruction(String target, String data) throws SAXException {
// ignore
}
public void setDocumentLocator(Locator locator) {
// ignore
}
public void skippedEntity(String name) throws SAXException {
// ignore
}
public void startDocument() throws SAXException {
// ignore
}
public void startElement(String uri, String localName, String qName, Attributes atts) throws SAXException {
if ("directory".equals(localName)) { //$NON-NLS-1$
if (directory != null) {
unexpectedElement(localName);
}
directory = new Directory();
} else if (directory != null && "entry".equals(localName)) { //$NON-NLS-1$
String url = atts.getValue("", "url"); //$NON-NLS-1$ //$NON-NLS-2$
if (url != null && url.length() > 0) {
Entry entry = new Entry();
entry.setLocation(url);
entry.setPermitCategories(Boolean.parseBoolean(atts.getValue("permitCategories"))); //$NON-NLS-1$
directory.getEntries().add(entry);
}
}
// else ignore
}
private void unexpectedElement(String localName) throws SAXException {
throw new SAXException(NLS.bind(Messages.DirectoryParser_unexpected_element, localName));
}
public void startPrefixMapping(String prefix, String uri) throws SAXException {
// ignore
}
}
}
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