| package org.apache.maven.shared.dependency.analyzer.asm; |
| |
| /* |
| * 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. |
| */ |
| |
| import org.apache.commons.io.IOUtils; |
| import org.apache.maven.shared.dependency.analyzer.ClassFileVisitor; |
| import org.objectweb.asm.AnnotationVisitor; |
| import org.objectweb.asm.ClassReader; |
| import org.objectweb.asm.ClassVisitor; |
| import org.objectweb.asm.FieldVisitor; |
| import org.objectweb.asm.MethodVisitor; |
| import org.objectweb.asm.signature.SignatureVisitor; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Set; |
| |
| /** |
| * Computes the set of classes referenced by visited class files, using |
| * <a href="DependencyVisitor.html">DependencyVisitor</a>. |
| * |
| * @author <a href="mailto:markhobson@gmail.com">Mark Hobson</a> |
| * @see #getDependencies() |
| */ |
| public class DependencyClassFileVisitor |
| implements ClassFileVisitor |
| { |
| private final ResultCollector resultCollector = new ResultCollector(); |
| |
| /** |
| * <p>Constructor for DependencyClassFileVisitor.</p> |
| */ |
| public DependencyClassFileVisitor() |
| { |
| } |
| |
| /** {@inheritDoc} */ |
| public void visitClass( String className, InputStream in ) |
| { |
| try |
| { |
| byte[] byteCode = IOUtils.toByteArray( in ); |
| ClassReader reader = new ClassReader( byteCode ); |
| |
| final Set<String> constantPoolClassRefs = ConstantPoolParser.getConstantPoolClassReferences( byteCode ); |
| for ( String string : constantPoolClassRefs ) |
| { |
| resultCollector.addName( string ); |
| } |
| |
| AnnotationVisitor annotationVisitor = new DefaultAnnotationVisitor( resultCollector ); |
| SignatureVisitor signatureVisitor = new DefaultSignatureVisitor( resultCollector ); |
| FieldVisitor fieldVisitor = new DefaultFieldVisitor( annotationVisitor, resultCollector ); |
| MethodVisitor mv = new DefaultMethodVisitor( annotationVisitor, signatureVisitor, resultCollector ); |
| ClassVisitor classVisitor = |
| new DefaultClassVisitor( signatureVisitor, annotationVisitor, fieldVisitor, mv, resultCollector ); |
| |
| reader.accept( classVisitor, 0 ); |
| } |
| catch ( IOException exception ) |
| { |
| exception.printStackTrace(); |
| } |
| catch ( IndexOutOfBoundsException e ) |
| { |
| // some bug inside ASM causes an IOB exception. Log it and move on? |
| // this happens when the class isn't valid. |
| System.out.println( "Unable to process: " + className ); |
| } |
| } |
| |
| /** |
| * <p>getDependencies.</p> |
| * |
| * @return the set of classes referenced by visited class files |
| */ |
| public Set<String> getDependencies() |
| { |
| return resultCollector.getDependencies(); |
| } |
| } |