org.eclipse.mylyn.context.core/src/org/eclipse/mylyn/internal/core/MylarContextExternalizer.java

/*******************************************************************************
 * Copyright (c) 2004 - 2006 University Of British Columbia 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:
 *     University Of British Columbia - initial API and implementation
 *******************************************************************************/
/*
 * Created on May 22, 2005
 */
package org.eclipse.mylar.internal.core;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Locale;

import org.eclipse.mylar.internal.core.util.MylarStatusHandler;
import org.eclipse.mylar.internal.core.util.SaxContextReader;
import org.eclipse.mylar.internal.core.util.SaxContextWriter;
import org.eclipse.mylar.provisional.core.IContextReader;
import org.eclipse.mylar.provisional.core.IContextWriter;

/**
 * @author Mik Kersten
 */
public class MylarContextExternalizer {

	private IContextReader reader = new SaxContextReader();

	private IContextWriter writer = new SaxContextWriter();

	public static final String ELMNT_INTERACTION_HISTORY_OLD = "interactionEvent";

	public static final String ELMNT_INTERACTION_HISTORY = "InteractionHistory";

	public static final String ATR_STRUCTURE_KIND = "StructureKind";

	public static final String ATR_STRUCTURE_HANDLE = "StructureHandle";

	public static final String ATR_START_DATE = "StartDate";

	public static final String ATR_ORIGIN_ID = "OriginId";

	public static final String ATR_NAVIGATION = "Navigation";

	public static final String ATR_KIND = "Kind";

	public static final String ATR_INTEREST = "Interest";

	public static final String ATR_DELTA = "Delta";

	public static final String ATR_END_DATE = "EndDate";

	public static final String ATR_ID = "Id";

	public static final String ATR_VERSION = "Version";

	private static final String DATE_FORMAT_STRING = "yyyy-MM-dd HH:mm:ss.S z";

	public static SimpleDateFormat DATE_FORMAT = new SimpleDateFormat(DATE_FORMAT_STRING, Locale.ENGLISH);

	public void writeContextToXML(MylarContext context, File file) {
		if (context.getInteractionHistory().isEmpty())
			return;
		try {
			if (!file.exists())
				file.createNewFile();
			OutputStream stream = new FileOutputStream(file);
			writer.setOutputStream(stream);
			writer.writeContextToStream(context);
			stream.close();
		} catch (IOException e) {
			MylarStatusHandler.fail(e, "Could not write: " + file.getAbsolutePath(), true);
		}
	}

	public MylarContext readContextFromXML(String handleIdentifier, File file) {
		try {
			if (!file.exists())
				return null;
			return reader.readContext(handleIdentifier, file);
		} catch (Exception e) {
			MylarStatusHandler.fail(e, "Could not read: " + file.getAbsolutePath(), true);
		}
		return null;
	}

	public IContextReader getReader() {
		return reader;
	}

	public void setReader(IContextReader reader) {
		this.reader = reader;
	}

	public IContextWriter getWriter() {
		return writer;
	}

	public void setWriter(IContextWriter writer) {
		this.writer = writer;
	}
}