Glassfish example source code file (ASMClassFile.java)

This example Glassfish source code file (ASMClassFile.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

acc_interface, acc_interface, acc_protected, asmclassfile, collection, io, log, logging, myvisitor, myvisitor, noi18n, noi18n, object, override, string, string, stringbuilder, util

The Glassfish ASMClassFile.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
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 */

package com.sun.enterprise.tools.verifier.apiscan.classfile;

import static org.objectweb.asm.Opcodes.*;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.commons.EmptyVisitor;

import java.io.IOException;
import java.io.InputStream;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Logger;

/**
 * @author Sanjeeb.Sahoo@Sun.COM
 */
class ASMClassFile implements ClassFile {

    private static Logger logger = Logger.getLogger("apiscan.classfile"); // NOI18N

    private String externalName;

    private String internalName;

    private String packageName;

    private ClassReader cr;

    private Set<Method> methods = new HashSet();

    private String internalNameOfSuperClass;

    private String[] internalNamesOfInterfaces;

    private int access;

    public boolean isInterface() {
        return (access & ACC_INTERFACE) == ACC_INTERFACE;
    }

    public Method getMethod(MethodRef methodRef) {
        for (Method m : methods) {
            if (m.getName().equals(methodRef.getName()) &&
                    m.getDescriptor().equals(methodRef.getDescriptor())) {
                return m;
            }
        }
        return null;
    }

    public Collection<Method> getMethods() {
        return methods;
    }

    public ASMClassFile(InputStream is)
            throws IOException {
        cr = new ClassReader(is);
        cr.accept(new MyVisitor(this), ClassReader.SKIP_CODE);
        is.close();
    }

    public Collection<String> getAllReferencedClassNames() {
        throw new UnsupportedOperationException();
    }

    public Collection getAllReferencedClassNamesInInternalForm() {
        throw new UnsupportedOperationException();
    }

   public String getName() {
        return externalName;
    }

    public String getInternalName() {
        return internalName;
    }

    public String getPackageName() {
        return packageName;
    }

    public String getNameOfSuperClass() {
        return Util.convertToExternalClassName(internalNameOfSuperClass);
    }

    public String getInternalNameOfSuperClass() {
        return internalNameOfSuperClass;
    }

    public String[] getNamesOfInterfaces() {
        String[] result = new String[internalNamesOfInterfaces.length];
        for(int i = 0; i< internalNamesOfInterfaces.length; ++i){
            result[i] = Util.convertToExternalClassName(internalNamesOfInterfaces[i]);
        }
        return result;
    }

    public String[] getInternalNamesOfInterfaces() {
        return internalNamesOfInterfaces;
    }

    @Override public String toString() {
        StringBuilder sb = new StringBuilder(decodeAccessFlag(access)+ externalName);
        if(internalNameOfSuperClass!=null) sb.append(" extends "+getNameOfSuperClass()); // NOI18N
        if(internalNamesOfInterfaces.length>0){
            sb.append(" implements "); // NOI18N
            for(String s : getNamesOfInterfaces()) sb.append(s);
        }
        sb.append("{\n"); // NOI18N
        for(Method m : methods){
            sb.append(m).append("\n"); // NOI18N
        }
        sb.append("}"); // NOI18N
        return sb.toString();
    }

    private static class MyVisitor extends EmptyVisitor {
        ASMClassFile cf;

        public MyVisitor(ASMClassFile cf) {
            this.cf = cf;
        }

        @Override public void visit(
                int version, int access, String name, String signature,
                String superName, String[] interfaces) {
            logger.entering(
                    "com.sun.enterprise.tools.verifier.apiscan.classfile.ASMClassFile$MyVisitor", "visit", // NOI18N
                    new Object[]{version, access, name, signature});
            cf.internalName = name;
            cf.externalName = Util.convertToExternalClassName(name);
            cf.internalNameOfSuperClass = superName;
            cf.internalNamesOfInterfaces = interfaces;
            int index = name.lastIndexOf('/');
            if (index < 0)
                cf.packageName = "";
            else
                cf.packageName = name.substring(0, index);
            cf.access = access;
        }

        @Override public MethodVisitor visitMethod(
                int access, String name, String desc, String signature,
                String[] exceptions) {
            logger.entering(
                    "com.sun.enterprise.tools.verifier.apiscan.classfile.ASMClassFile$MyVisitor", "visitMethod", // NOI18N
                    new Object[]{access, name, signature, desc});
            ASMMethod method = new ASMMethod(cf, name, desc, access,
                    signature, exceptions);
            cf.methods.add(method);
            return method;
        }

        @Override public void visitEnd() {
            logger.entering("ASMClassFile$MyVisitor", "visitEnd", // NOI18N
                    new Object[]{cf.getName()});
        }
    }

    public static String decodeAccessFlag(int access) {
        StringBuilder result = new StringBuilder("");
        if ((access & ACC_PRIVATE) == ACC_PRIVATE) {
            result.append("private "); // NOI18N
        } else if ((access & ACC_PROTECTED) == ACC_PROTECTED) {
            result.append("protected "); // NOI18N
        } else if ((access & ACC_PUBLIC) == ACC_PUBLIC) {
            result.append("public "); // NOI18N
        }
        if ((access & ACC_ABSTRACT) == ACC_ABSTRACT) {
            result.append("abstract "); // NOI18N
        } else if ((access & ACC_FINAL) == ACC_FINAL) {
            result.append("final "); // NOI18N
        }
        if ((access & ACC_INTERFACE) == ACC_INTERFACE) {
            result.append("interface "); // NOI18N
        } else {
            result.append("class "); // NOI18N
        }
        return result.toString();
    }

}