/**
*
* Funf: Open Sensing Framework
* Copyright (C) 2010-2011 Nadav Aharony, Wei Pan, Alex Pentland.
* Acknowledgments: Alan Gardner
* Contact: nadav@media.mit.edu
*
* This file is part of Funf.
*
* Funf is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* Funf is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Funf. If not, see <http://www.gnu.org/licenses/>.
*
*/
package edu.mit.media.funf.storage;
import java.io.File;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
/**
* Attempts to use the first archive. If that fails, continues down the list until a successful archive is reached.
*
*/
public class CompositeFileArchive implements FileArchive {
private final FileArchive[] archives;
public CompositeFileArchive(FileArchive... archives) {
this.archives = archives;
}
@Override
public boolean add(File item) {
// Add to archive one by one, until one is successful or archives are exhausted.
for (FileArchive archive : archives) {
if(archive.add(item)) {
return true;
}
}
return false;
}
@Override
public File[] getAll() {
// Merge files from all archives, ignoring duplicates
Set<File> fileSet = new HashSet<File>();
for (FileArchive archive : archives) {
fileSet.addAll(Arrays.asList(archive.getAll()));
}
File[] files = new File[fileSet.size()];
fileSet.toArray(files);
return files;
}
@Override
public boolean remove(File item) {
// Remove on every archive, returning true if at least one was successful
boolean success = false;
for (FileArchive archive : archives) {
if(archive.remove(item)) {
success = true;
}
}
return success;
}
@Override
public boolean contains(File item) {
for (FileArchive archive : archives) {
if (archive.contains(item)) {
return true;
}
}
return false;
}
}