| 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.objectweb.asm.AnnotationVisitor; |
| import org.objectweb.asm.Label; |
| import org.objectweb.asm.MethodVisitor; |
| import org.objectweb.asm.Opcodes; |
| import org.objectweb.asm.Type; |
| import org.objectweb.asm.signature.SignatureReader; |
| import org.objectweb.asm.signature.SignatureVisitor; |
| |
| |
| /** |
| * Computes the set of classes referenced by visited code. |
| * Inspired by <code>org.objectweb.asm.depend.DependencyVisitor</code> in the ASM dependencies example. |
| * |
| * @author <a href="mailto:markhobson@gmail.com">Mark Hobson</a> |
| * @version $Id$ |
| */ |
| public class DefaultMethodVisitor |
| extends MethodVisitor |
| { |
| private final AnnotationVisitor annotationVisitor; |
| |
| private final SignatureVisitor signatureVisitor; |
| |
| private final ResultCollector resultCollector; |
| |
| public DefaultMethodVisitor( AnnotationVisitor annotationVisitor, SignatureVisitor signatureVisitor, |
| ResultCollector resultCollector ) |
| { |
| super( Opcodes.ASM5 ); |
| this.annotationVisitor = annotationVisitor; |
| this.signatureVisitor = signatureVisitor; |
| this.resultCollector = resultCollector; |
| } |
| |
| public AnnotationVisitor visitAnnotation( final String desc, final boolean visible ) |
| { |
| resultCollector.addDesc( desc ); |
| |
| return annotationVisitor; |
| } |
| |
| |
| public AnnotationVisitor visitParameterAnnotation( final int parameter, final String desc, final boolean visible ) |
| { |
| resultCollector.addDesc( desc ); |
| |
| return annotationVisitor; |
| } |
| |
| public void visitTypeInsn( final int opcode, final String desc ) |
| { |
| if ( desc.charAt( 0 ) == '[' ) |
| { |
| resultCollector.addDesc( desc ); |
| } |
| else |
| { |
| resultCollector.addName( desc ); |
| } |
| } |
| |
| public void visitFieldInsn( final int opcode, final String owner, final String name, final String desc ) |
| { |
| resultCollector.addName( owner ); |
| /* |
| * NOTE: Merely accessing a field does not impose a direct dependency on its type. For example, the code line |
| * <code>java.lang.Object var = bean.field;</code> does not directly depend on the type of the field. A direct |
| * dependency is only introduced when the code explicitly references the field's type by means of a variable |
| * declaration or a type check/cast. Those cases are handled by other visitor callbacks. |
| */ |
| } |
| |
| public void visitMethodInsn( final int opcode, final String owner, final String name, final String desc ) |
| { |
| resultCollector.addName( owner ); |
| /* |
| * NOTE: Merely invoking a method does not impose a direct dependency on its return type nor its parameter |
| * types. For example, the code line <code>bean.method(null);</code> only depends on the owner type of the |
| * method. A direct dependency is only introduced when the code explicitly references the method's types by |
| * means of a variable declaration or a type check/cast. Those cases are handled by other visitor callbacks. |
| */ |
| } |
| |
| public void visitLdcInsn( final Object cst ) |
| { |
| if ( cst instanceof Type ) |
| { |
| resultCollector.addType( (Type) cst ); |
| } |
| } |
| |
| public void visitMultiANewArrayInsn( final String desc, final int dims ) |
| { |
| resultCollector.addDesc( desc ); |
| } |
| |
| public void visitTryCatchBlock( final Label start, final Label end, final Label handler, final String type ) |
| { |
| resultCollector.addName( type ); |
| } |
| |
| public void visitLocalVariable( final String name, final String desc, final String signature, final Label start, |
| final Label end, final int index ) |
| { |
| if ( signature == null ) |
| { |
| resultCollector.addDesc( desc ); |
| } |
| else |
| { |
| addTypeSignature( signature ); |
| } |
| } |
| |
| private void addTypeSignature( final String signature ) |
| { |
| if ( signature != null ) |
| { |
| new SignatureReader( signature ).acceptType( signatureVisitor ); |
| } |
| } |
| } |