/*
* BioJava development code
*
* This code may be freely distributed and modified under the
* terms of the GNU Lesser General Public Licence. This should
* be distributed with the code. If you do not have a copy,
* see:
*
* http://www.gnu.org/copyleft/lesser.html
*
* Copyright for this code is held jointly by the individual
* authors. These should be listed in @author doc comments.
*
* For more information on the BioJava project and its aims,
* or to join the biojava-l mailing list, visit the home page
* at:
*
* http://www.biojava.org/
*
*/
package org.biojava.bio.program.indexdb;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Map;
import java.util.Properties;
import org.biojava.bio.AbstractAnnotation;
import org.biojava.bio.BioError;
import org.biojava.utils.Commitable;
/**
* PropertiesAnnotation
creates an
* Annotation
view of a Properties
bundle.
*
* @author Matthew Pocock
* @author Keith James
*/
class PropertiesAnnotation
extends AbstractAnnotation implements Commitable {
private Properties props;
private File propsFile;
/**
* Creates a new PropertiesAnnotation
.
*
* @param propsFile a File
which should be a Java
* Properties
file.
*/
public PropertiesAnnotation(File propsFile) {
this.propsFile = propsFile;
this.props = new Properties();
if(propsFile.exists()) {
try {
props.load(new FileInputStream(propsFile));
} catch (IOException ioe) {
throw new BioError( "Assertion Failure: could not load properties",ioe);
}
}
}
public void commit() {
try {
props.store(new FileOutputStream(propsFile), "Meta-Data");
} catch (IOException ioe) {
try {
rollback();
} catch (BioError be) {
throw new BioError("Catastrophic failure: could not roll back after failed commit",be);
}
throw new BioError("Could not commit");
}
}
public void rollback() {
if(propsFile.exists()) {
try {
props.load(new FileInputStream(propsFile));
} catch (IOException ioe) {
throw new BioError("Could not roll back");
}
} else {
props.clear();
}
}
protected Map getProperties() {
return props;
}
protected boolean propertiesAllocated() {
return true;
}
}