org.codehaus.mojo.versions.utils.DependencyComparator Maven / Gradle / Ivy

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Common components for the Versions Maven Plugin

There is a newer version: 2.18.0

package org.codehaus.mojo.versions.utils;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

import java.util.Comparator;

import org.apache.commons.lang3.StringUtils;
import org.apache.maven.model.Dependency;

/**
 * A comparator used to sort dependencies by group id, artifact id and finally version.
 *
 * @since 1.0-alpha-1
 */
public enum DependencyComparator implements Comparator {
    INSTANCE;

    /**
     * @param d1 the first dependency
     * @param d2 the second dependency.
     * @return the comparison result
     * @see java.util.Comparator#compare(Object, Object)
     * @since 1.0-alpha-1
     */
    @SuppressWarnings("checkstyle:InnerAssignment")
    public int compare(Dependency d1, Dependency d2) {
        int r;
        return d1 == d2
                ? 0
                : d1 == null
                        ? 1
                        : d2 == null
                                ? -1
                                : (r = StringUtils.compare(d1.getGroupId(), d2.getGroupId())) != 0
                                        ? r
                                        : (r = StringUtils.compare(d1.getArtifactId(), d2.getArtifactId())) != 0
                                                ? r
                                                : StringUtils.compare(d1.getVersion(), d2.getVersion());
    }
}