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/*******************************************************************************
* Copyright (c) 2012-2013 University of Stuttgart.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and the Apache License 2.0 which both accompany this distribution,
* and are available at http://www.eclipse.org/legal/epl-v10.html
* and http://www.apache.org/licenses/LICENSE-2.0
*
* Contributors:
* Oliver Kopp - initial API and implementation
*******************************************************************************/
package org.eclipse.winery.repository.backend.filebased;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.commons.configuration.event.ConfigurationEvent;
import org.apache.commons.configuration.event.ConfigurationListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* We do not count loads and saves as in
* {@link org.apache.commons.configuration.builder.AutoSaveListener}, because
* ConfigurationListener is not aware of such things
*/
class AutoSaveListener implements ConfigurationListener {
private static final Logger logger = LoggerFactory.getLogger(AutoSaveListener.class);
private final Path path;
private final PropertiesConfiguration configuration;
/**
*
* @param path the file path to write to
* @param configuration the configuration, where the change events come
* from. This is needed as <code>event.getSource()</code> does
* not work
*/
public AutoSaveListener(Path path, PropertiesConfiguration configuration) {
this.path = path;
this.configuration = configuration;
}
@Override
public void configurationChanged(ConfigurationEvent event) {
if (!event.isBeforeUpdate()) {
try {
if (!Files.exists(this.path.getParent())) {
Files.createDirectories(this.path.getParent());
}
} catch (IOException ce) {
AutoSaveListener.logger.error("Could not update properties file", ce);
return;
}
try (OutputStream out = Files.newOutputStream(this.path, StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING)) {
OutputStreamWriter writer = new OutputStreamWriter(out);
this.configuration.save(writer);
} catch (ConfigurationException | IOException ce) {
AutoSaveListener.logger.error("Could not update properties file", ce);
}
}
}
}
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