org.commonjava.indy.subsys.prefetch.PrefetchRepoComparator.java Source code

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Here is the source code for org.commonjava.indy.subsys.prefetch.PrefetchRepoComparator.java

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/**
 * Copyright (C) 2011-2018 Red Hat, Inc. (https://github.com/Commonjava/indy)
 *
 * 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 org.commonjava.indy.subsys.prefetch;

import org.apache.commons.lang.StringUtils;
import org.commonjava.indy.model.core.RemoteRepository;

import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Comparator;

public class PrefetchRepoComparator<T extends RemoteRepository> implements Comparator<RemoteRepository> {
    @Override
    public int compare(RemoteRepository r1, RemoteRepository r2) {
        if (r1 == null) {
            return 1;
        }
        if (r2 == null) {
            return -1;
        }

        final int priorityCompareResult = r2.getPrefetchPriority() - r1.getPrefetchPriority();
        if (StringUtils.isBlank(r1.getPrefetchRescanTimestamp())
                && StringUtils.isBlank(r2.getPrefetchRescanTimestamp())) {
            return priorityCompareResult;
        }

        if (StringUtils.isBlank(r1.getPrefetchRescanTimestamp())
                && StringUtils.isNotBlank(r2.getPrefetchRescanTimestamp())) {
            return -1;
        } else if (StringUtils.isBlank(r2.getPrefetchRescanTimestamp())
                && StringUtils.isNotBlank(r1.getPrefetchRescanTimestamp())) {
            return 1;
        }

        final ZonedDateTime rescanTime1 = ZonedDateTime.parse(r1.getPrefetchRescanTimestamp(),
                RescanTimeUtils.UTC_TIME_FORMATTER);
        final ZonedDateTime rescanTime2 = ZonedDateTime.parse(r2.getPrefetchRescanTimestamp(),
                RescanTimeUtils.UTC_TIME_FORMATTER);

        if (rescanTime1.isBefore(rescanTime2)) {
            return -1;
        } else if (rescanTime1.isAfter(rescanTime2)) {
            return 1;
        } else {
            return priorityCompareResult;
        }
    }

}