001package org.apache.maven.model.resolution;
002
003/*
004 * Licensed to the Apache Software Foundation (ASF) under one
005 * or more contributor license agreements.  See the NOTICE file
006 * distributed with this work for additional information
007 * regarding copyright ownership.  The ASF licenses this file
008 * to you under the Apache License, Version 2.0 (the
009 * "License"); you may not use this file except in compliance
010 * with the License.  You may obtain a copy of the License at
011 *
012 *   http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing,
015 * software distributed under the License is distributed on an
016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
017 * KIND, either express or implied.  See the License for the
018 * specific language governing permissions and limitations
019 * under the License.
020 */
021
022import org.apache.maven.model.Repository;
023import org.apache.maven.model.building.ModelSource;
024
025/**
026 * Resolves a POM from its coordinates. During the build process, the
027 * {@link org.apache.maven.model.building.ModelBuilder} will add any relevant repositories to the model resolver. In
028 * other words, the model resolver is stateful and should not be reused across multiple model building requests.
029 *
030 * @author Benjamin Bentmann
031 */
032public interface ModelResolver
033{
034
035    /**
036     * Tries to resolve the POM for the specified coordinates.
037     *
038     * @param groupId The group identifier of the POM, must not be {@code null}.
039     * @param artifactId The artifact identifier of the POM, must not be {@code null}.
040     * @param version The version of the POM, must not be {@code null}.
041     * @return The source of the requested POM, never {@code null}.
042     * @throws UnresolvableModelException If the POM could not be resolved from any configured repository.
043     */
044    ModelSource resolveModel( String groupId, String artifactId, String version )
045        throws UnresolvableModelException;
046
047    /**
048     * Adds a repository to use for subsequent resolution requests. The order in which repositories are added matters,
049     * repositories that were added first should also be searched first. When multiple repositories with the same
050     * identifier are added, only the first repository being added will be used.
051     *
052     * @param repository The repository to add to the internal search chain, must not be {@code null}.
053     * @throws InvalidRepositoryException If the repository could not be added (e.g. due to invalid URL or layout).
054     */
055    void addRepository( Repository repository )
056        throws InvalidRepositoryException;
057
058    /**
059     * Clones this resolver for usage in a forked resolution process. In general, implementors need not provide a deep
060     * clone. The only requirement is that invocations of {@link #addRepository(Repository)} on the clone do not affect
061     * the state of the original resolver and vice versa.
062     *
063     * @return The cloned resolver, never {@code null}.
064     */
065    ModelResolver newCopy();
066
067}