/**
 * Copyright 2010 JBoss Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.drools.guvnor.server.util;

/*
 * Copyright 2005 JBoss Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import java.util.ArrayList;
import java.util.List;

import org.drools.guvnor.client.ruleeditor.PropertiesHolder;
import org.drools.guvnor.client.ruleeditor.PropertyHolder;

/**
 * used to convert PropertiesHolder to text and back
 * 
 * @author Anton Arhipov
 */
public class PropertiesPersistence {

	private static PropertiesPersistence INSTANCE = new PropertiesPersistence();

	private PropertiesPersistence() {
	}

	public static PropertiesPersistence getInstance() {
		return INSTANCE;
	}

	public String marshal(PropertiesHolder holder) {
		StringBuilder sb = new StringBuilder();
		for (PropertyHolder propertyHolder : holder.list) {
			sb.append(propertyHolder.name).append("=").append(
					propertyHolder.value).append("\n");
		}
		return sb.toString();
	}

	public PropertiesHolder unmarshal(String properties) {
		List<PropertyHolder> list = new ArrayList<PropertyHolder>();
		String[] props = properties.split("\n");
		if (props != null) {
			for (String s : props) {
				String[] pair = s.split("=");
				if (pair.length == 2) {
					list.add(new PropertyHolder(pair[0], pair[1]));
				}
			}
		}
		PropertiesHolder result = new PropertiesHolder();
		result.list = list;
		return result;
	}

}