001    package org.apache.maven.plugin;
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    
022    import java.util.List;
023    
024    import org.apache.maven.execution.MavenSession;
025    import org.apache.maven.model.Plugin;
026    import org.apache.maven.plugin.descriptor.MojoDescriptor;
027    import org.apache.maven.plugin.descriptor.PluginDescriptor;
028    import org.eclipse.aether.RepositorySystemSession;
029    import org.eclipse.aether.graph.DependencyFilter;
030    import org.eclipse.aether.repository.RemoteRepository;
031    
032    /**
033     * Provides basic services to manage Maven plugins and their mojos. This component is kept general in its design such
034     * that the plugins/mojos can be used in arbitrary contexts. In particular, the mojos can be used for ordinary build
035     * plugins as well as special purpose plugins like reports.
036     * 
037     * @since 3.0
038     * @author Benjamin Bentmann
039     */
040    public interface MavenPluginManager
041    {
042    
043        /**
044         * Retrieves the descriptor for the specified plugin from its main artifact.
045         * 
046         * @param plugin The plugin whose descriptor should be retrieved, must not be {@code null}.
047         * @param repositories The plugin repositories to use for resolving the plugin's main artifact, must not be {@code
048         *            null}.
049         * @param session The repository session to use for resolving the plugin's main artifact, must not be {@code null}.
050         * @return The plugin descriptor, never {@code null}.
051         */
052        PluginDescriptor getPluginDescriptor( Plugin plugin, List<RemoteRepository> repositories, RepositorySystemSession session )
053            throws PluginResolutionException, PluginDescriptorParsingException, InvalidPluginDescriptorException;
054    
055        /**
056         * Retrieves the descriptor for the specified plugin goal from the plugin's main artifact.
057         * 
058         * @param plugin The plugin whose mojo descriptor should be retrieved, must not be {@code null}.
059         * @param goal The simple name of the mojo whose descriptor should be retrieved, must not be {@code null}.
060         * @param repositories The plugin repositories to use for resolving the plugin's main artifact, must not be {@code
061         *            null}.
062         * @param session The repository session to use for resolving the plugin's main artifact, must not be {@code null}.
063         * @return The mojo descriptor, never {@code null}.
064         */
065        MojoDescriptor getMojoDescriptor( Plugin plugin, String goal, List<RemoteRepository> repositories,
066                                          RepositorySystemSession session )
067            throws MojoNotFoundException, PluginResolutionException, PluginDescriptorParsingException,
068            InvalidPluginDescriptorException;
069    
070        /**
071         * Verifies the specified plugin is compatible with the current Maven runtime.
072         * 
073         * @param pluginDescriptor The descriptor of the plugin to check, must not be {@code null}.
074         */
075        void checkRequiredMavenVersion( PluginDescriptor pluginDescriptor )
076            throws PluginIncompatibleException;
077    
078        /**
079         * Sets up the class realm for the specified plugin. Both the class realm and the plugin artifacts that constitute
080         * it will be stored in the plugin descriptor.
081         * 
082         * @param pluginDescriptor The plugin descriptor in which to save the class realm and the plugin artifacts, must not
083         *            be {@code null}.
084         * @param session The build session from which to pick the current project and repository settings, must not be
085         *            {@code null}.
086         * @param parent The parent class realm for the plugin, may be {@code null} to use the Maven core realm.
087         * @param imports The packages/types to import from the parent realm, may be {@code null}.
088         * @param filter The filter used to exclude certain plugin dependencies, may be {@code null}.
089         */
090        void setupPluginRealm( PluginDescriptor pluginDescriptor, MavenSession session, ClassLoader parent,
091                               List<String> imports, DependencyFilter filter )
092            throws PluginResolutionException, PluginContainerException;
093    
094        /**
095         * Looks up the mojo for the specified mojo execution and populates its parameters from the configuration given by
096         * the mojo execution. The mojo/plugin descriptor associated with the mojo execution provides the class realm to
097         * lookup the mojo from. <strong>Warning:</strong> The returned mojo instance must be released via
098         * {@link #releaseMojo(Object, MojoExecution)} when the mojo is no longer needed to free any resources allocated for
099         * it.
100         * 
101         * @param mojoInterface The component role of the mojo, must not be {@code null}.
102         * @param session The build session in whose context the mojo will be used, must not be {@code null}.
103         * @param mojoExecution The mojo execution to retrieve the mojo for, must not be {@code null}.
104         * @return The ready-to-execute mojo, never {@code null}.
105         */
106        <T> T getConfiguredMojo( Class<T> mojoInterface, MavenSession session, MojoExecution mojoExecution )
107            throws PluginConfigurationException, PluginContainerException;
108    
109        /**
110         * Releases the specified mojo back to the container.
111         * 
112         * @param mojo The mojo to release, may be {@code null}.
113         * @param mojoExecution The mojo execution the mojo was originally retrieved for, must not be {@code null}.
114         */
115        void releaseMojo( Object mojo, MojoExecution mojoExecution );
116    
117    }