jetty-deploy-manager-graph/src/main/java/org/eclipse/jetty/deploy/support/FileConfigurationManager.java

// ========================================================================
// Copyright (c) 2006-2009 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
// The Eclipse Public License is available at 
// http://www.eclipse.org/legal/epl-v10.html
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
// You may elect to redistribute this code under either of these licenses. 
// ========================================================================

package org.eclipse.jetty.deploy.support;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.Map;
import java.util.Properties;

import org.eclipse.jetty.util.resource.Resource;

/**
 * FileConfigurationManager
 * 
 * Supplies properties defined in a file.
 */
public class FileConfigurationManager implements ConfigurationManager
{
    private Resource _file;
    private Properties _properties = new Properties();

    public FileConfigurationManager()
    {
    }

    public void setFile(String filename) throws MalformedURLException, IOException
    {
        _file = Resource.newResource(filename);
    }

    /**
     * @see org.eclipse.jetty.deploy.ConfigurationManager#getProperties()
     */
    public Map<?, ?> getProperties()
    {
        try
        {
            loadProperties();
            return _properties;
        }
        catch (Exception e)
        {
            throw new RuntimeException(e);
        }
    }

    private void loadProperties() throws FileNotFoundException, IOException
    {
        if (_properties.isEmpty())
        {
            _properties.load(_file.getInputStream());
        }
    }
}