ConfigConnectionFactory.java

package org.wavescale.sourcesync.factory;

/**
 * ****************************************************************************
 * Copyright (c) 2005-2014 Faur Ioan-Aurel.                                     *
 * All rights reserved. This program and the accompanying materials             *
 * are made available under the terms of the MIT License                        *
 * which accompanies this distribution, and is available at                     *
 * http://opensource.org/licenses/MIT                                           *
 * *
 * For any issues or questions send an email at: fioan89@gmail.com              *
 * *****************************************************************************
 */

import org.wavescale.sourcesync.api.ConnectionConfiguration;

import java.io.*;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * Load connection settings from the persistence layout, instantiate them and keep them
 * during the runtime.
 */
public class ConfigConnectionFactory {
    private static final ConfigConnectionFactory CONFIG_CONNECTION_FACTORY = new ConfigConnectionFactory();
    private static final String CONNECTIONS_FILE = ".connectionconfig.ser";
    String fileSeparator;
    private String userHome;
    private Map<String, ConnectionConfiguration> connectionConfigurationMap;

    private ConfigConnectionFactory() {
        connectionConfigurationMap = new HashMap<String, ConnectionConfiguration>();
        userHome = System.getProperty("user.home");
        fileSeparator = System.getProperty("file.separator");
        initComponent();
    }

    public static ConfigConnectionFactory getInstance() {
        return CONFIG_CONNECTION_FACTORY;
    }

    /**
     * Searches for the connection configuration that is assigned to the given name. If not found
     * null is returned.
     *
     * @param connectionName a <code>String</code> representing the connection name.
     * @return an implementation of the <code>ConnectionConfiguration</code>
     */
    public ConnectionConfiguration getConnectionConfiguration(String connectionName) {
        return connectionConfigurationMap.get(connectionName);
    }

    /**
     * Gets a set of all living connection names from the factory.
     *
     * @return a set of strings representing connection names that live inside the factory.
     */
    public Set<String> getConnectionNames() {
        return connectionConfigurationMap.keySet();
    }

    public void addConnectionConfiguration(String connectionName, ConnectionConfiguration connectionConfiguration) {
        connectionConfigurationMap.put(connectionName, connectionConfiguration);
    }

    public void removeConnectionConfiguration(String connectionName) {
        connectionConfigurationMap.remove(connectionName);
    }

    @SuppressWarnings("unchecked")
    private void initComponent() {
        // try to load the persistence data.
        if (new File(userHome.concat(fileSeparator).concat(CONNECTIONS_FILE)).exists()) {
            try {
                FileInputStream inputStream = new FileInputStream(userHome.concat(fileSeparator).concat(CONNECTIONS_FILE));
                ObjectInputStream in = new ObjectInputStream(inputStream);
                connectionConfigurationMap = (Map<String, ConnectionConfiguration>) in.readObject();
                in.close();
                inputStream.close();
            } catch (IOException i) {
                i.printStackTrace();
            } catch (ClassNotFoundException c) {
                c.printStackTrace();
            }
        }
    }

    public void saveConnections() {
        // try to write the persistence data
        try {
            FileOutputStream outputStream = new FileOutputStream(userHome.concat(fileSeparator).concat(CONNECTIONS_FILE));
            ObjectOutputStream out = new ObjectOutputStream(outputStream);
            out.writeObject(connectionConfigurationMap);
            out.close();
            outputStream.close();
        } catch (IOException i) {
            i.printStackTrace();
        }
    }
}