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1   package org.apache.maven.plugin;
2   
3   /*
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *   http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing,
15   * software distributed under the License is distributed on an
16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17   * KIND, either express or implied.  See the License for the
18   * specific language governing permissions and limitations
19   * under the License.
20   */
21  
22  import java.util.ArrayList;
23  import java.util.HashMap;
24  import java.util.List;
25  import java.util.Map;
26  
27  import org.apache.maven.artifact.ArtifactUtils;
28  import org.apache.maven.model.Plugin;
29  import org.apache.maven.plugin.descriptor.MojoDescriptor;
30  import org.apache.maven.plugin.descriptor.PluginDescriptor;
31  import org.codehaus.plexus.component.annotations.Component;
32  import org.codehaus.plexus.component.repository.ComponentDescriptor;
33  import org.eclipse.aether.RepositorySystemSession;
34  import org.eclipse.aether.repository.LocalRepository;
35  import org.eclipse.aether.repository.RemoteRepository;
36  import org.eclipse.aether.repository.WorkspaceRepository;
37  
38  /**
39   * Caches raw plugin descriptors. A raw plugin descriptor is a descriptor that has just been extracted from the plugin
40   * artifact and does not contain any runtime specific data. The cache must not be used for descriptors that hold runtime
41   * data like the plugin realm. <strong>Warning:</strong> This is an internal utility interface that is only public for
42   * technical reasons, it is not part of the public API. In particular, this interface can be changed or deleted without
43   * prior notice.
44   * 
45   * @since 3.0
46   * @author Benjamin Bentmann
47   */
48  @Component( role = PluginDescriptorCache.class )
49  public class DefaultPluginDescriptorCache
50      implements PluginDescriptorCache
51  {
52  
53      private Map<Key, PluginDescriptor> descriptors = new HashMap<Key, PluginDescriptor>( 128 );
54  
55      public void flush()
56      {
57          descriptors.clear();
58      }
59  
60      public Key createKey( Plugin plugin, List<RemoteRepository> repositories, RepositorySystemSession session )
61      {
62          return new CacheKey( plugin, repositories, session );
63      }
64  
65      public PluginDescriptor get( Key cacheKey )
66      {
67          return clone( descriptors.get( cacheKey ) );
68      }
69  
70      public void put( Key cacheKey, PluginDescriptor pluginDescriptor )
71      {
72          descriptors.put( cacheKey, clone( pluginDescriptor ) );
73      }
74  
75      protected static PluginDescriptor clone( PluginDescriptor original )
76      {
77          PluginDescriptor clone = null;
78  
79          if ( original != null )
80          {
81              clone = new PluginDescriptor();
82  
83              clone.setGroupId( original.getGroupId() );
84              clone.setArtifactId( original.getArtifactId() );
85              clone.setVersion( original.getVersion() );
86              clone.setGoalPrefix( original.getGoalPrefix() );
87              clone.setInheritedByDefault( original.isInheritedByDefault() );
88  
89              clone.setName( original.getName() );
90              clone.setDescription( original.getDescription() );
91              clone.setRequiredMavenVersion( original.getRequiredMavenVersion() );
92  
93              clone.setPluginArtifact( ArtifactUtils.copyArtifactSafe( original.getPluginArtifact() ) );
94  
95              clone.setComponents( clone( original.getMojos(), clone ) );
96              clone.setId( original.getId() );
97              clone.setIsolatedRealm( original.isIsolatedRealm() );
98              clone.setSource( original.getSource() );
99  
100             clone.setDependencies( original.getDependencies() );
101         }
102 
103         return clone;
104     }
105 
106     private static List<ComponentDescriptor<?>> clone( List<MojoDescriptor> mojos, PluginDescriptor pluginDescriptor )
107     {
108         List<ComponentDescriptor<?>> clones = null;
109 
110         if ( mojos != null )
111         {
112             clones = new ArrayList<ComponentDescriptor<?>>( mojos.size() );
113 
114             for ( MojoDescriptor mojo : mojos )
115             {
116                 MojoDescriptor clone = mojo.clone();
117                 clone.setPluginDescriptor( pluginDescriptor );
118                 clones.add( clone );
119             }
120         }
121 
122         return clones;
123     }
124 
125     private static final class CacheKey
126         implements Key
127     {
128 
129         private final String groupId;
130 
131         private final String artifactId;
132 
133         private final String version;
134 
135         private final WorkspaceRepository workspace;
136 
137         private final LocalRepository localRepo;
138 
139         private final List<RemoteRepository> repositories;
140 
141         private final int hashCode;
142 
143         public CacheKey( Plugin plugin, List<RemoteRepository> repositories, RepositorySystemSession session )
144         {
145             groupId = plugin.getGroupId();
146             artifactId = plugin.getArtifactId();
147             version = plugin.getVersion();
148 
149             workspace = CacheUtils.getWorkspace( session );
150             localRepo = session.getLocalRepository();
151             this.repositories = new ArrayList<RemoteRepository>( repositories.size() );
152             for ( RemoteRepository repository : repositories )
153             {
154                 if ( repository.isRepositoryManager() )
155                 {
156                     this.repositories.addAll( repository.getMirroredRepositories() );
157                 }
158                 else
159                 {
160                     this.repositories.add( repository );
161                 }
162             }
163 
164             int hash = 17;
165             hash = hash * 31 + groupId.hashCode();
166             hash = hash * 31 + artifactId.hashCode();
167             hash = hash * 31 + version.hashCode();
168             hash = hash * 31 + hash( workspace );
169             hash = hash * 31 + localRepo.hashCode();
170             hash = hash * 31 + CacheUtils.repositoriesHashCode( repositories );
171             this.hashCode = hash;
172         }
173 
174         @Override
175         public int hashCode()
176         {
177             return hashCode;
178         }
179 
180         @Override
181         public boolean equals( Object obj )
182         {
183             if ( this == obj )
184             {
185                 return true;
186             }
187 
188             if ( !( obj instanceof CacheKey ) )
189             {
190                 return false;
191             }
192 
193             CacheKey that = (CacheKey) obj;
194 
195             return eq( this.artifactId, that.artifactId ) && eq( this.groupId, that.groupId )
196                 && eq( this.version, that.version ) && eq( this.localRepo, that.localRepo )
197                 && eq( this.workspace, that.workspace )
198                 && CacheUtils.repositoriesEquals( this.repositories, that.repositories );
199         }
200 
201         @Override
202         public String toString()
203         {
204             return groupId + ':' + artifactId + ':' + version;
205         }
206 
207         private static int hash( Object obj )
208         {
209             return obj != null ? obj.hashCode() : 0;
210         }
211 
212         private static <T> boolean eq( T s1, T s2 )
213         {
214             return s1 != null ? s1.equals( s2 ) : s2 == null;
215         }
216 
217     }
218 
219 }