org.apache.maven.shared.dependency.analyzer.asm.LocalClassVisitor.java Source code

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Here is the source code for org.apache.maven.shared.dependency.analyzer.asm.LocalClassVisitor.java

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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.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
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;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 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 LocalClassVisitor extends ClassVisitor {
    protected static Logger log = LoggerFactory.getLogger(LocalClassVisitor.class);

    // fields -----------------------------------------------------------------

    private final ResultCollector resultCollector;

    private final SignatureVisitor signatureVisitor;

    private final AnnotationVisitor annotationVisitor;

    private final FieldVisitor fieldVisitor;

    private final MethodVisitor methodVisitor;

    // constructors -----------------------------------------------------------

    public LocalClassVisitor(SignatureVisitor signatureVisitor, AnnotationVisitor annotationVisitor,
            FieldVisitor fieldVisitor, MethodVisitor methodVisitor, ResultCollector resultCollector) {
        super(Opcodes.ASM5);
        this.signatureVisitor = signatureVisitor;
        this.annotationVisitor = annotationVisitor;
        this.fieldVisitor = fieldVisitor;
        this.methodVisitor = methodVisitor;
        this.resultCollector = resultCollector;
    }

    public void visit(final int version, final int access, final String name, final String signature,
            final String superName, final String[] interfaces) {
        //      log.info("v: {}", name);
        if (signature == null) {
            resultCollector.addName(superName);
            resultCollector.addNames(interfaces);
        } else {
            addSignature(signature);
        }
    }

    public AnnotationVisitor visitAnnotation(final String desc, final boolean visible) {
        resultCollector.addDesc(desc);

        return annotationVisitor;
    }

    public FieldVisitor visitField(final int access, final String name, final String desc, final String signature,
            final Object value) {
        //      log.info("fields {} : {}", name, desc);
        if (signature == null) {
            resultCollector.addDesc(desc);
        } else {
            addTypeSignature(signature);
        }

        if (value instanceof Type) {
            resultCollector.addType((Type) value);
        }

        return fieldVisitor;
    }

    public MethodVisitor visitMethod(final int access, final String name, final String desc, final String signature,
            final String[] exceptions) {
        //      log.info("methods {} : {}", name, desc);

        if (signature == null) {
            resultCollector.addMethodDesc(desc);
        } else {
            addSignature(signature);
        }

        resultCollector.addNames(exceptions);

        return methodVisitor;
    }

    // private methods --------------------------------------------------------

    private void addSignature(final String signature) {
        if (signature != null) {
            new SignatureReader(signature).accept(signatureVisitor);
        }
    }

    private void addTypeSignature(final String signature) {
        if (signature != null) {
            new SignatureReader(signature).acceptType(signatureVisitor);
        }
    }

}