/**
* DataCleaner (community edition)
* Copyright (C) 2014 Neopost - Customer Information Management
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program 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 this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.datacleaner.repository.file;
import java.io.File;
import java.io.FileFilter;
/**
* A file filter decoration used to find the latest of all files that pass
* through another {@link FileFilter}.
*/
public class LatestFileFilter implements FileFilter {
private final FileFilter _delegate;
private File _candidate;
private long _latestModified;
public LatestFileFilter(final FileFilter delegate) {
_delegate = delegate;
_latestModified = Long.MIN_VALUE;
}
@Override
public boolean accept(final File candidate) {
if (candidate.lastModified() > _latestModified && _delegate.accept(candidate)) {
_latestModified = candidate.lastModified();
_candidate = candidate;
}
// always return false, this filter should not be used as a mapping
// function, but as an aggregate.
return false;
}
public File getLatestFile() {
return _candidate;
}
}