org.eclipse.lyo.client.oslc.samples.automation.WriteThroughProperties.java Source code

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Here is the source code for org.eclipse.lyo.client.oslc.samples.automation.WriteThroughProperties.java

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/*******************************************************************************
 * Copyright (c) 2012 IBM Corporation.
 *
 *  All rights reserved. This program and the accompanying materials
 *  are made available under the terms of the Eclipse Public License v1.0
 *  and Eclipse Distribution License v. 1.0 which accompanies this distribution.
 *  
 *  The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 *  and the Eclipse Distribution License is available at
 *  http://www.eclipse.org/org/documents/edl-v10.php.
 *  
 *  Contributors:
 *  
 *     Paul McMahan <pmcmahan@us.ibm.com>     - initial implementation
 *******************************************************************************/
package org.eclipse.lyo.client.oslc.samples.automation;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URI;
import java.util.Properties;

import org.apache.commons.io.FileUtils;

/**
 * Subclass of Properties class that writes through to a backing file when a
 * property is set.
 */
public class WriteThroughProperties extends Properties {

    private static final long serialVersionUID = 1L;

    private final File adapterPropertiesFile;

    /**
     * Default constructor.
     * 
     * @param fileUri
     *            URI for a local File containing the properties
     * @throws IOException 
     */
    public WriteThroughProperties(URI fileUri) throws IOException {

        this.adapterPropertiesFile = new File(fileUri);

        FileInputStream fis = FileUtils.openInputStream(adapterPropertiesFile);

        load(fis);

        fis.close();

    }

    @Override
    public synchronized Object setProperty(String key, String value) {

        Object property = super.setProperty(key, value);

        try {

            FileOutputStream fos = FileUtils.openOutputStream(adapterPropertiesFile);

            store(fos, "Write through save for property : " + key);

            fos.close();

        } catch (IOException e) {

            throw new RuntimeException(e);

        }

        return property;
    }

}