1 package org.apache.maven.shared.dependency.analyzer.asm;
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.io.IOException;
23 import java.io.InputStream;
24 import java.util.HashSet;
25 import java.util.Set;
26
27 import org.apache.maven.shared.dependency.analyzer.ClassFileVisitor;
28 import org.objectweb.asm.ClassReader;
29
30 /**
31 * Computes the set of classes referenced by visited class files, using
32 * <a href="DependencyVisitor.html">DependencyVisitor</a>.
33 *
34 * @author <a href="mailto:markhobson@gmail.com">Mark Hobson</a>
35 * @version $Id: DependencyClassFileVisitor.java 1174427 2011-09-22 22:25:17Z hboutemy $
36 * @see #getDependencies()
37 */
38 public class DependencyClassFileVisitor
39 implements ClassFileVisitor
40 {
41 // fields -----------------------------------------------------------------
42
43 private final Set<String> dependencies;
44
45 // constructors -----------------------------------------------------------
46
47 public DependencyClassFileVisitor()
48 {
49 dependencies = new HashSet<String>();
50 }
51
52 // ClassFileVisitor methods -----------------------------------------------
53
54 /*
55 * @see org.apache.maven.shared.dependency.analyzer.ClassFileVisitor#visitClass(java.lang.String,
56 * java.io.InputStream)
57 */
58 public void visitClass( String className, InputStream in )
59 {
60 try
61 {
62 ClassReader reader = new ClassReader( in );
63 DependencyVisitor visitor = new DependencyVisitor();
64
65 reader.accept( visitor, 0 );
66
67 dependencies.addAll( visitor.getClasses() );
68 }
69 catch ( IOException exception )
70 {
71 exception.printStackTrace();
72 }
73 catch ( IndexOutOfBoundsException e )
74 {
75 // some bug inside ASM causes an IOB exception. Log it and move on?
76 // this happens when the class isn't valid.
77 System.out.println( "Unable to process: " + className );
78 }
79 }
80
81 // public methods ---------------------------------------------------------
82
83 /**
84 *
85 * @return the set of classes referenced by visited class files
86 */
87 public Set<String> getDependencies()
88 {
89 return dependencies;
90 }
91 }