001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.eclipse.aether.graph;
020
021/**
022 * An exclusion of one or more transitive dependencies.
023 *
024 * @see Dependency#getExclusions()
025 */
026public final class Exclusion {
027
028    private final String groupId;
029
030    private final String artifactId;
031
032    private final String classifier;
033
034    private final String extension;
035
036    /**
037     * Creates an exclusion for artifacts with the specified coordinates.
038     *
039     * @param groupId The group identifier, may be {@code null}.
040     * @param artifactId The artifact identifier, may be {@code null}.
041     * @param classifier The classifier, may be {@code null}.
042     * @param extension The file extension, may be {@code null}.
043     */
044    public Exclusion(String groupId, String artifactId, String classifier, String extension) {
045        this.groupId = (groupId != null) ? groupId : "";
046        this.artifactId = (artifactId != null) ? artifactId : "";
047        this.classifier = (classifier != null) ? classifier : "";
048        this.extension = (extension != null) ? extension : "";
049    }
050
051    /**
052     * Gets the group identifier for artifacts to exclude.
053     *
054     * @return The group identifier, never {@code null}.
055     */
056    public String getGroupId() {
057        return groupId;
058    }
059
060    /**
061     * Gets the artifact identifier for artifacts to exclude.
062     *
063     * @return The artifact identifier, never {@code null}.
064     */
065    public String getArtifactId() {
066        return artifactId;
067    }
068
069    /**
070     * Gets the classifier for artifacts to exclude.
071     *
072     * @return The classifier, never {@code null}.
073     */
074    public String getClassifier() {
075        return classifier;
076    }
077
078    /**
079     * Gets the file extension for artifacts to exclude.
080     *
081     * @return The file extension of artifacts to exclude, never {@code null}.
082     */
083    public String getExtension() {
084        return extension;
085    }
086
087    @Override
088    public String toString() {
089        return getGroupId()
090                + ':'
091                + getArtifactId()
092                + ':'
093                + getExtension()
094                + (getClassifier().length() > 0 ? ':' + getClassifier() : "");
095    }
096
097    @Override
098    public boolean equals(Object obj) {
099        if (obj == this) {
100            return true;
101        } else if (obj == null || !getClass().equals(obj.getClass())) {
102            return false;
103        }
104
105        Exclusion that = (Exclusion) obj;
106
107        return artifactId.equals(that.artifactId)
108                && groupId.equals(that.groupId)
109                && extension.equals(that.extension)
110                && classifier.equals(that.classifier);
111    }
112
113    @Override
114    public int hashCode() {
115        int hash = 17;
116        hash = hash * 31 + artifactId.hashCode();
117        hash = hash * 31 + groupId.hashCode();
118        hash = hash * 31 + classifier.hashCode();
119        hash = hash * 31 + extension.hashCode();
120        return hash;
121    }
122}