com.cloudhopper.commons.util.filefilter.FileNameDateTimeFilter Maven / Gradle / Ivy
package com.cloudhopper.commons.util.filefilter;
/*
* #%L
* ch-commons-util
* %%
* Copyright (C) 2012 Cloudhopper by Twitter
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
import java.io.File;
import java.io.FileFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import com.cloudhopper.commons.util.DateTimeUtil;
/**
* Filters a file based on an embedded date within the filename.
*
* @author joelauer (twitter: @jjlauer or http://twitter.com/jjlauer)
*/
public class FileNameDateTimeFilter implements FileFilter {
private static final Logger logger = LoggerFactory.getLogger(FileNameDateTimeFilter.class);
private String pattern;
private DateTime cutoffDate;
private DateTimeZone zone;
public FileNameDateTimeFilter(DateTime cutoffDate) {
this(cutoffDate, null, null);
}
public FileNameDateTimeFilter(DateTime cutoffDate, DateTimeZone zone) {
this(cutoffDate, null, zone);
}
public FileNameDateTimeFilter(DateTime cutoffDate, String pattern) {
this(cutoffDate, pattern, null);
}
public FileNameDateTimeFilter(DateTime cutoffDate, String pattern, DateTimeZone zone) {
this.cutoffDate = cutoffDate;
if (pattern == null) {
this.pattern = "yyyy-MM-dd";
} else {
this.pattern = pattern;
}
if (zone == null) {
this.zone = DateTimeZone.UTC;
} else {
this.zone = zone;
}
}
@Override
public boolean accept(File file) {
// parse out the date contained within the filename
DateTime d = null;
try {
d = DateTimeUtil.parseEmbedded(file.getName(), pattern, zone);
} catch (Exception e) {
// ignore for matching
return false;
}
logger.trace("Filename '" + file.getName() + "' contained an embedded date of " + d);
// does the cutoff date occurr before or equal
if (d.isBefore(cutoffDate) || d.isEqual(cutoffDate)) {
logger.trace("Filename '" + file.getName() + "' embedded date of " + d + " occurred beforeOrEquals " + d.isBefore(cutoffDate));
return true;
}
// if we get here, then the date wasn't right
logger.trace("Skipping filename '" + file.getName() + "' since its embedded date of " + d + " occurred after " + cutoffDate);
return false;
}
}