// Copyright 2012 Citrix Systems, Inc. Licensed under the
// Apache License, Version 2.0 (the "License"); you may not use this
// file except in compliance with the License.  Citrix Systems, Inc.
// reserves all rights not expressly granted by 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.
// 
// Automatically generated by addcopyright.py at 04/03/2012
package com.cloud.agent.dao.impl;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Map;
import java.util.Properties;

import javax.ejb.Local;

import org.apache.log4j.Logger;

import com.cloud.agent.dao.StorageComponent;
import com.cloud.utils.PropertiesUtil;

/**
 * Uses Properties to implement storage.
 * 
 * @config {@table || Param Name | Description | Values | Default || || path |
 *         path to the properties _file | String | db/db.properties || * }
 **/
@Local(value = { StorageComponent.class })
public class PropertiesStorage implements StorageComponent {
	private static final Logger s_logger = Logger
			.getLogger(PropertiesStorage.class);
	Properties _properties = new Properties();
	File _file;
	String _name;

	@Override
	public synchronized String get(String key) {
		return _properties.getProperty(key);
	}

	@Override
	public synchronized void persist(String key, String value) {
		_properties.setProperty(key, value);
		FileOutputStream output = null;
		try {
			output = new FileOutputStream(_file);
			_properties.store(output, _name);
			output.flush();
			output.close();
		} catch (FileNotFoundException e) {
			s_logger.error("Who deleted the file? ", e);
		} catch (IOException e) {
			s_logger.error("Uh-oh: ", e);
		} finally {
			if (output != null) {
				try {
					output.close();
				} catch (IOException e) {
					// ignore.
				}
			}
		}
	}

	@Override
	public boolean configure(String name, Map<String, Object> params) {
		_name = name;
		String path = (String) params.get("path");
		if (path == null) {
			path = "agent.properties";
		}

		File file = PropertiesUtil.findConfigFile(path);
		if (file == null) {
			file = new File(path);
			try {
				if (!file.createNewFile()) {
					s_logger.error("Unable to create _file: "
							+ file.getAbsolutePath());
					return false;
				}
			} catch (IOException e) {
				s_logger.error(
						"Unable to create _file: " + file.getAbsolutePath(), e);
				return false;
			}
		}

		try {
			_properties.load(new FileInputStream(file));
			_file = file;
		} catch (FileNotFoundException e) {
			s_logger.error("How did we get here? ", e);
			return false;
		} catch (IOException e) {
			s_logger.error("IOException: ", e);
			return false;
		}

		return true;
	}

	@Override
	public String getName() {
		return _name;
	}

	@Override
	public boolean start() {
		return true;
	}

	@Override
	public boolean stop() {
		return true;
	}

}