/*******************************************************************************
 * Copyright (c) 2005, 2006 Erkki Lindpere 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:
 *     Erkki Lindpere - initial API and implementation
 *******************************************************************************/
package org.eclipse.ecf.internal.provider.phpbb;

import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Util class for de-serializing objects serialized in PHP.
 * 
 * @author Erkki
 */
public class PHPUtil {
	/**
	 * Matches an array.
	 */
	private static final Pattern PHP_STRING_ARRAY = Pattern
			.compile("a:(?:[0-9]+):\\{(.*)\\}");

	/**
	 * Matches a string.
	 */
	private static final Pattern PHP_STRING = Pattern
			.compile("s:(?:[0-9]+):\"(.*?)\"");

	/**
	 * Deserializes a PHP array that has string key and value pairs as a HashMap
	 * or null if it was not an array.
	 * 
	 * @param serializedArray
	 *            the character sequence that contains the serialized array
	 * @return the deserialized array as a HashMap or null
	 */
	public static Map<String, String> deserializeStringArray(CharSequence serializedArray) {
		Matcher m = PHP_STRING_ARRAY.matcher(serializedArray);
		if (m.matches()) {
			Map<String, String> map = new HashMap<String, String>();
			Matcher strMatcher = PHP_STRING.matcher(m.group(1));
			String key = null;
			while (strMatcher.find()) {
				if (key == null) {
					key = strMatcher.group(1);
				} else {
					map.put(key, strMatcher.group(1));
					key = null;
				}
			}
			return map;
		} else {
			return null;
		}
	}
}