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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.Iterator;
23  import java.util.List;
24  
25  import org.apache.maven.model.Dependency;
26  import org.apache.maven.model.Exclusion;
27  import org.apache.maven.model.Plugin;
28  import org.eclipse.aether.RepositorySystemSession;
29  import org.eclipse.aether.repository.RemoteRepository;
30  import org.eclipse.aether.repository.RepositoryPolicy;
31  import org.eclipse.aether.repository.WorkspaceReader;
32  import org.eclipse.aether.repository.WorkspaceRepository;
33  
34  /**
35   * @author Benjamin Bentmann
36   */
37  class CacheUtils
38  {
39  
40      public static <T> boolean eq( T s1, T s2 )
41      {
42          return s1 != null ? s1.equals( s2 ) : s2 == null;
43      }
44  
45      public static int hash( Object obj )
46      {
47          return obj != null ? obj.hashCode() : 0;
48      }
49  
50      public static int repositoriesHashCode( List<RemoteRepository> repositories )
51      {
52          int result = 17;
53          for ( RemoteRepository repository : repositories )
54          {
55              result = 31 * result + repositoryHashCode( repository );
56          }
57          return result;
58      }
59  
60      private static int repositoryHashCode( RemoteRepository repository )
61      {
62          int result = 17;
63          result = 31 * result + hash( repository.getUrl() );
64          return result;
65      }
66  
67      private static boolean repositoryEquals( RemoteRepository r1, RemoteRepository r2 )
68      {
69          if ( r1 == r2 )
70          {
71              return true;
72          }
73  
74          return eq( r1.getId(), r2.getId() ) && eq( r1.getUrl(), r2.getUrl() )
75              && policyEquals( r1.getPolicy( false ), r2.getPolicy( false ) )
76              && policyEquals( r1.getPolicy( true ), r2.getPolicy( true ) );
77      }
78  
79      private static boolean policyEquals( RepositoryPolicy p1, RepositoryPolicy p2 )
80      {
81          if ( p1 == p2 )
82          {
83              return true;
84          }
85          // update policy doesn't affect contents
86          return p1.isEnabled() == p2.isEnabled() && eq( p1.getChecksumPolicy(), p2.getChecksumPolicy() );
87      }
88  
89      public static boolean repositoriesEquals( List<RemoteRepository> r1, List<RemoteRepository> r2 )
90      {
91          if ( r1.size() != r2.size() )
92          {
93              return false;
94          }
95  
96          for ( Iterator<RemoteRepository> it1 = r1.iterator(), it2 = r2.iterator(); it1.hasNext(); )
97          {
98              if ( !repositoryEquals( it1.next(), it2.next() ) )
99              {
100                 return false;
101             }
102         }
103 
104         return true;
105     }
106 
107     public static int pluginHashCode( Plugin plugin )
108     {
109         int hash = 17;
110 
111         hash = hash * 31 + hash( plugin.getGroupId() );
112         hash = hash * 31 + hash( plugin.getArtifactId() );
113         hash = hash * 31 + hash( plugin.getVersion() );
114 
115         hash = hash * 31 + ( plugin.isExtensions() ? 1 : 0 );
116 
117         for ( Dependency dependency : plugin.getDependencies() )
118         {
119             hash = hash * 31 + hash( dependency.getGroupId() );
120             hash = hash * 31 + hash( dependency.getArtifactId() );
121             hash = hash * 31 + hash( dependency.getVersion() );
122             hash = hash * 31 + hash( dependency.getType() );
123             hash = hash * 31 + hash( dependency.getClassifier() );
124             hash = hash * 31 + hash( dependency.getScope() );
125 
126             for ( Exclusion exclusion : dependency.getExclusions() )
127             {
128                 hash = hash * 31 + hash( exclusion.getGroupId() );
129                 hash = hash * 31 + hash( exclusion.getArtifactId() );
130             }
131         }
132 
133         return hash;
134     }
135 
136     public static boolean pluginEquals( Plugin a, Plugin b )
137     {
138         return eq( a.getArtifactId(), b.getArtifactId() ) //
139             && eq( a.getGroupId(), b.getGroupId() ) //
140             && eq( a.getVersion(), b.getVersion() ) // 
141             && a.isExtensions() == b.isExtensions() //
142             && dependenciesEquals( a.getDependencies(), b.getDependencies() );
143     }
144 
145     private static boolean dependenciesEquals( List<Dependency> a, List<Dependency> b )
146     {
147         if ( a.size() != b.size() )
148         {
149             return false;
150         }
151 
152         Iterator<Dependency> aI = a.iterator();
153         Iterator<Dependency> bI = b.iterator();
154 
155         while ( aI.hasNext() )
156         {
157             Dependency aD = aI.next();
158             Dependency bD = bI.next();
159 
160             boolean r = eq( aD.getGroupId(), bD.getGroupId() ) //
161                 && eq( aD.getArtifactId(), bD.getArtifactId() ) //
162                 && eq( aD.getVersion(), bD.getVersion() ) // 
163                 && eq( aD.getType(), bD.getType() ) //
164                 && eq( aD.getClassifier(), bD.getClassifier() ) //
165                 && eq( aD.getScope(), bD.getScope() );
166 
167             r &= exclusionsEquals( aD.getExclusions(), bD.getExclusions() );
168 
169             if ( !r )
170             {
171                 return false;
172             }
173         }
174 
175         return true;
176     }
177 
178     private static boolean exclusionsEquals( List<Exclusion> a, List<Exclusion> b )
179     {
180         if ( a.size() != b.size() )
181         {
182             return false;
183         }
184 
185         Iterator<Exclusion> aI = a.iterator();
186         Iterator<Exclusion> bI = b.iterator();
187 
188         while ( aI.hasNext() )
189         {
190             Exclusion aD = aI.next();
191             Exclusion bD = bI.next();
192 
193             boolean r = eq( aD.getGroupId(), bD.getGroupId() ) //
194                 && eq( aD.getArtifactId(), bD.getArtifactId() );
195 
196             if ( !r )
197             {
198                 return false;
199             }
200         }
201 
202         return true;
203     }
204 
205     public static WorkspaceRepository getWorkspace( RepositorySystemSession session )
206     {
207         WorkspaceReader reader = session.getWorkspaceReader();
208         return ( reader != null ) ? reader.getRepository() : null;
209     }
210 
211 }