com.inmobi.conduit.utils.DatePathComparator.java Source code

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Here is the source code for com.inmobi.conduit.utils.DatePathComparator.java

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/*
* 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.
*/
package com.inmobi.conduit.utils;

import java.util.Comparator;
import java.util.Date;

import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.Path;
import org.apache.log4j.Logger;

public class DatePathComparator implements Comparator<FileStatus> {

    static Logger LOG = Logger.getLogger(DatePathComparator.class);

    @Override
    public int compare(FileStatus fileStatus, FileStatus fileStatus1) {

        /*
        * Path eg:
        * <rootdir>/system/distcp_mirror_srcCluster_destCluster/conduit/streams
        * /<stream-Name>/2012/1/13/15/7/<hostname>-<streamName>-2012-01-16-07
        * -21_00000.gz
        *
        * in some cases paths can empty without files
        * eg:   /conduit/system/distcp_mirror_srcCluster_destCluster/conduit
        * /streams/<streamName>/2012/1/13/15/7/
        */

        Path streamDir = null;
        Path streamDir1 = null;
        Date streamDate1 = null;
        Date streamDate = null;

        if (fileStatus != null) {
            if (!fileStatus.isDir())
                streamDir = fileStatus.getPath().getParent();
            else
                streamDir = fileStatus.getPath();
            Path streamDirPrefix = streamDir.getParent().getParent().getParent().getParent().getParent();

            streamDate = CalendarHelper.getDateFromStreamDir(streamDirPrefix, streamDir);
        }

        if (fileStatus1 != null) {
            if (!fileStatus1.isDir())
                streamDir1 = fileStatus1.getPath().getParent();
            else
                streamDir1 = fileStatus1.getPath();

            Path streamDirPrefix1 = streamDir1.getParent().getParent().getParent().getParent().getParent();

            streamDate1 = CalendarHelper.getDateFromStreamDir(streamDirPrefix1, streamDir1);
        }

        if (streamDate != null && streamDate1 != null)
            return streamDate.compareTo(streamDate1);
        else
            return -1;

    }
}