UserManager.java

package org.opennaas.extensions.ofertie.ncl.provisioner.components;

/*
 * #%L
 * OpenNaaS :: Generic Network
 * %%
 * Copyright (C) 2007 - 2014 Fundació Privada i2CAT, Internet i Innovació a Catalunya
 * %%
 * 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.
 * #L%
 */

import java.io.BufferedReader;
import java.io.CharArrayWriter;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Set;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.opennaas.core.resources.ObjectSerializer;
import org.opennaas.core.resources.SerializationException;
import org.opennaas.extensions.ofertie.ncl.provisioner.model.User;
import org.opennaas.extensions.ofertie.ncl.provisioner.model.UserSet;

/**
 * 
 * @author Adrián Roselló Rey (i2CAT)
 *
 */
public class UserManager {

	private final static String	USER_REGISTRY_URL	= "etc/org.opennaas.extensions.ofertie.ncl.users.xml";

	private static Log			log					= LogFactory.getLog(UserManager.class);

	public Set<User> getUsers() throws IOException, SerializationException {

		String usersString = readXMLFile(USER_REGISTRY_URL);
		UserSet userRegistry = (UserSet) ObjectSerializer.fromXml(usersString, UserSet.class);

		return userRegistry.getUsers();
	}

	public User getUser(String username) throws IOException, SerializationException {

		Set<User> users = getUsers();

		for (User user : users)
			if (user.getUsername().equals(username))
				return user;

		return null;

	}

	private static String readXMLFile(String filePath) throws IOException {

		log.debug("Reading content of file " + filePath);

		InputStreamReader reader = null;
		BufferedReader bufferReader = null;
		try {
			URL url = new URL(filePath);
			reader = new InputStreamReader(url.openStream());
			bufferReader = new BufferedReader(reader);
		} catch (MalformedURLException ignore) {
			// They try a file
			File file = new File(filePath);
			bufferReader = new BufferedReader(new FileReader(file));
		}
		CharArrayWriter w = new CharArrayWriter();
		int n;
		char[] buf = new char[8192];
		while ((n = bufferReader.read(buf)) > 0) {
			w.write(buf, 0, n);
		}
		bufferReader.close();
		String fileContent = w.toString();
		log.debug("Readed content of file " + filePath);

		return fileContent;
	}

}