GemManagerContentHandler.java

package com.aptana.rdt.internal.core.gems;

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.Locator;
import org.xml.sax.SAXException;

import com.aptana.rdt.core.gems.Gem;

public class GemManagerContentHandler implements ContentHandler {

	private HashSet<Gem> gems;
	private String name;
	private String version;
	private String description;
	
	private StringBuffer data = new StringBuffer();
	private String platform;	
	
	public void characters(char[] ch, int start, int length) throws SAXException {
		for (int i = start; i < start + length; i++) {
			data.append(ch[i]);
		}
	}

	public void endDocument() throws SAXException {
		// do nothing
	}

	public void endElement(String namespaceURI, String localName, String qName)
			throws SAXException {
		if (qName.equals("name")) {
			name = data.toString();
		} else if (qName.equals("version")) {
			version = data.toString();
		} else if (qName.equals("description")) {
			description = data.toString();
		} else if (qName.equals("platform")) {
			platform = data.toString();
		} else if (qName.equals("gem")) {
			if (version.indexOf(",") != -1) {
				String[] versions = version.split(", ");
				for (int i = 0; i < versions.length; i++) {
					gems.add(new Gem(name, versions[i], description, platform));
				}
			} else {
				gems.add(new Gem(name, version, description, platform));
			}
		}
		data.delete(0, data.length());
	}

	public void endPrefixMapping(String arg0) throws SAXException {
		// do nothing
	}

	public void ignorableWhitespace(char[] arg0, int arg1, int arg2)
			throws SAXException {
		// do nothing
	}

	public void processingInstruction(String arg0, String arg1)
			throws SAXException {
		// do nothing
	}

	public void setDocumentLocator(Locator arg0) {
		// do nothing
	}

	public void skippedEntity(String arg0) throws SAXException {
		// do nothing
	}

	public void startDocument() throws SAXException {
		gems = new HashSet<Gem>();
	}

	public void startElement(String namespaceURI, String localName,
			String qName, Attributes atts) throws SAXException {
	}

	public void startPrefixMapping(String arg0, String arg1)
			throws SAXException {
		// do nothing
	}

	public Set<Gem> getGems() {
		return Collections.unmodifiableSet(gems);
	}

}