maven-resolver-demos/maven-resolver-demo-snippets/src/main/java/org/apache/maven/resolver/examples/ReverseDependencyTree.java

/*
 * 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.
 */
package org.apache.maven.resolver.examples;

import org.apache.maven.resolver.examples.util.Booter;
import org.apache.maven.resolver.examples.util.ReverseTreeRepositoryListener;
import org.eclipse.aether.RepositorySystem;
import org.eclipse.aether.RepositorySystemSession.CloseableSession;
import org.eclipse.aether.artifact.Artifact;
import org.eclipse.aether.artifact.DefaultArtifact;
import org.eclipse.aether.collection.CollectRequest;
import org.eclipse.aether.resolution.ArtifactDescriptorRequest;
import org.eclipse.aether.resolution.ArtifactDescriptorResult;
import org.eclipse.aether.util.graph.manager.DependencyManagerUtils;
import org.eclipse.aether.util.graph.transformer.ConflictResolver;

/**
 * Example of building reverse dependency tree using custom {@link ReverseTreeRepositoryListener}.
 */
public class ReverseDependencyTree {

    /**
     * Main.
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        System.out.println("------------------------------------------------------------");
        System.out.println(ReverseDependencyTree.class.getSimpleName());

        try (RepositorySystem system = Booter.newRepositorySystem(Booter.selectFactory(args))) {
            try (CloseableSession session = Booter.newRepositorySystemSession(system)
                    .withRepositoryListener(new ReverseTreeRepositoryListener())
                    .setConfigProperty(ConflictResolver.CONFIG_PROP_VERBOSE, true)
                    .setConfigProperty(DependencyManagerUtils.CONFIG_PROP_VERBOSE, true)
                    .build()) {
                Artifact artifact = new DefaultArtifact("org.apache.maven:maven-resolver-provider:3.6.1");

                ArtifactDescriptorRequest descriptorRequest = new ArtifactDescriptorRequest();
                descriptorRequest.setArtifact(artifact);
                descriptorRequest.setRepositories(Booter.newRepositories(system, session));
                ArtifactDescriptorResult descriptorResult = system.readArtifactDescriptor(session, descriptorRequest);

                CollectRequest collectRequest = new CollectRequest();
                collectRequest.setRequestContext("demo");
                collectRequest.setRootArtifact(descriptorResult.getArtifact());
                collectRequest.setDependencies(descriptorResult.getDependencies());
                collectRequest.setManagedDependencies(descriptorResult.getManagedDependencies());
                collectRequest.setRepositories(descriptorRequest.getRepositories());

                system.collectDependencies(session, collectRequest);

                // in this demo we are not interested in collect result,
                // as all the "demo work" is done by installed ReverseTreeRepositoryListener
            }
        }
    }
}