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/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.team.internal.ccvs.ui.repo;
import java.io.*;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.team.core.TeamException;
import org.eclipse.team.internal.core.caches.ICacheSource;
import org.eclipse.team.internal.core.caches.LocalReplica;
import org.eclipse.ui.IMemento;
import org.eclipse.ui.XMLMemento;
/**
* A local replica that uses IMemento to persist and restore the local replica.
*/
public abstract class XMLLocalReplica extends LocalReplica {
/**
* Create an IMemento based local replica.
* @param remote the remote cache source being replicated
*/
protected XMLLocalReplica(ICacheSource remote) {
super(remote);
}
/* (non-Javadoc)
* @see org.eclipse.team.internal.core.caches.LocalReplica#save(java.lang.Object, org.eclipse.core.runtime.IProgressMonitor)
*/
protected void save(Object o, IProgressMonitor monitor) throws CoreException {
XMLMemento memento = XMLMemento.createWriteRoot(getType());
save(o, memento, monitor);
Writer writer = null;
try {
writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(getFile())));
memento.save(writer);
} catch (FileNotFoundException e) {
throw new TeamException("Could not create file " + getFile().getAbsolutePath(), e);
} catch (IOException e) {
throw new TeamException("Could not write to file " + getFile().getAbsolutePath(), e);
} finally {
if (writer != null) {
try {
writer.close();
} catch (IOException e1) {
// Ignore
}
}
}
}
private String getType() {
return "replica"; //$NON-NLS-1$
}
/* (non-Javadoc)
* @see org.eclipse.team.internal.core.caches.LocalReplica#load(org.eclipse.core.runtime.IProgressMonitor)
*/
protected Object load(int flags, IProgressMonitor monitor) throws CoreException {
// reload from the disk cache
Reader reader = null;
try {
reader = new BufferedReader(new InputStreamReader(new FileInputStream(getFile())));
XMLMemento memento = XMLMemento.createReadRoot(reader);
return load(flags, memento, monitor);
} catch (FileNotFoundException e) {
// No file on disk so fetch from the remote source
return fetchRemote(flags, monitor);
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e1) {
// Ignore
}
}
}
}
/**
* Return the file where the local replica is to be persisted.
* @return the file where the local replica is to be persisted
*/
protected abstract File getFile();
/**
* Save the object to the given memento which will be used to
* persist the locla replica to disk.
* @param o the object being cached
* @param memento the memento used to cache the object
* @param monitor a progress monitor
*/
protected abstract void save(Object o, IMemento memento, IProgressMonitor monitor) throws CoreException;
/**
* Load the object from the given memento.
* @param flags the flags passed to the cache reference
* @param memento the memento containing the replica
* @param monitor a progress monitor
* @return the object build from the replica
*/
protected abstract Object load(int flags, IMemento memento, IProgressMonitor monitor) throws CoreException;
}
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