/* $Id: NameAndTypeUsageMarker.java,v 1.14.2.1 2006/01/16 22:57:56 eric Exp $ * * ProGuard -- shrinking, optimization, and obfuscation of Java class files. * * Copyright (c) 2002-2006 Eric Lafortune (eric@graphics.cornell.edu) * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */package proguard.obfuscate;import proguard.classfile.*;import proguard.classfile.attribute.*;import proguard.classfile.attribute.annotation.*;import proguard.classfile.visitor.*;/** * This ClassFileVisitor marks all NameAndType constant pool entries that are * being used in the classes it visits. * * @see NameAndTypeShrinker * * @author Eric Lafortune */public class NameAndTypeUsageMarker  implements ClassFileVisitor,             CpInfoVisitor,             AttrInfoVisitor{    // A visitor info flag to indicate the NameAndType constant pool entry is being used.    private static final Object USED = new Object();    // Implementations for ClassFileVisitor.    public void visitProgramClassFile(ProgramClassFile programClassFile)    {        // Mark the NameAndType entries referenced by all other constant pool        // entries.        programClassFile.constantPoolEntriesAccept(this);        // Mark the NameAndType entries referenced by all EnclosingMethod        // attributes.        programClassFile.attributesAccept(this);    }    public void visitLibraryClassFile(LibraryClassFile libraryClassFile)    {    }    // Implementations for CpInfoVisitor.    public void visitIntegerCpInfo(ClassFile classFile, IntegerCpInfo integerCpInfo) {}    public void visitLongCpInfo(ClassFile classFile, LongCpInfo longCpInfo) {}    public void visitFloatCpInfo(ClassFile classFile, FloatCpInfo floatCpInfo) {}    public void visitDoubleCpInfo(ClassFile classFile, DoubleCpInfo doubleCpInfo) {}    public void visitUtf8CpInfo(ClassFile classFile, Utf8CpInfo utf8CpInfo) {}    public void visitStringCpInfo(ClassFile classFile, StringCpInfo stringCpInfo) {}    public void visitClassCpInfo(ClassFile classFile, ClassCpInfo classCpInfo) {}    public void visitNameAndTypeCpInfo(ClassFile classFile, NameAndTypeCpInfo nameAndTypeCpInfo) {}    public void visitFieldrefCpInfo(ClassFile classFile, FieldrefCpInfo fieldrefCpInfo)    {        visitRefCpInfo(classFile, fieldrefCpInfo);    }    public void visitInterfaceMethodrefCpInfo(ClassFile classFile, InterfaceMethodrefCpInfo interfaceMethodrefCpInfo)    {        visitRefCpInfo(classFile, interfaceMethodrefCpInfo);    }    public void visitMethodrefCpInfo(ClassFile classFile, MethodrefCpInfo methodrefCpInfo)    {        visitRefCpInfo(classFile, methodrefCpInfo);    }    private void visitRefCpInfo(ClassFile classFile, RefCpInfo refCpInfo)    {        markNameAndTypeCpEntry(classFile, refCpInfo.u2nameAndTypeIndex);    }    // Implementations for AttrInfoVisitor.    public void visitUnknownAttrInfo(ClassFile classFile, UnknownAttrInfo unknownAttrInfo) {}    public void visitInnerClassesAttrInfo(ClassFile classFile, InnerClassesAttrInfo innerClassesAttrInfo) {}    public void visitConstantValueAttrInfo(ClassFile classFile, FieldInfo fieldInfo, ConstantValueAttrInfo constantValueAttrInfo) {}    public void visitExceptionsAttrInfo(ClassFile classFile, MethodInfo methodInfo, ExceptionsAttrInfo exceptionsAttrInfo) {}    public void visitCodeAttrInfo(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo) {}    public void visitLineNumberTableAttrInfo(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, LineNumberTableAttrInfo lineNumberTableAttrInfo) {}    public void visitLocalVariableTableAttrInfo(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, LocalVariableTableAttrInfo localVariableTableAttrInfo) {}    public void visitLocalVariableTypeTableAttrInfo(ClassFile classFile, MethodInfo methodInfo, CodeAttrInfo codeAttrInfo, LocalVariableTypeTableAttrInfo localVariableTypeTableAttrInfo) {}    public void visitSourceFileAttrInfo(ClassFile classFile, SourceFileAttrInfo sourceFileAttrInfo) {}    public void visitSourceDirAttrInfo(ClassFile classFile, SourceDirAttrInfo sourceDirAttrInfo) {}    public void visitDeprecatedAttrInfo(ClassFile classFile, DeprecatedAttrInfo deprecatedAttrInfo) {}    public void visitSyntheticAttrInfo(ClassFile classFile, SyntheticAttrInfo syntheticAttrInfo) {}    public void visitSignatureAttrInfo(ClassFile classFile, SignatureAttrInfo signatureAttrInfo) {}    public void visitRuntimeVisibleAnnotationAttrInfo(ClassFile classFile, RuntimeVisibleAnnotationsAttrInfo runtimeVisibleAnnotationsAttrInfo) {}    public void visitRuntimeInvisibleAnnotationAttrInfo(ClassFile classFile, RuntimeInvisibleAnnotationsAttrInfo runtimeInvisibleAnnotationsAttrInfo) {}    public void visitRuntimeVisibleParameterAnnotationAttrInfo(ClassFile classFile, RuntimeVisibleParameterAnnotationsAttrInfo runtimeVisibleParameterAnnotationsAttrInfo) {}    public void visitRuntimeInvisibleParameterAnnotationAttrInfo(ClassFile classFile, RuntimeInvisibleParameterAnnotationsAttrInfo runtimeInvisibleParameterAnnotationsAttrInfo) {}    public void visitAnnotationDefaultAttrInfo(ClassFile classFile, AnnotationDefaultAttrInfo annotationDefaultAttrInfo) {}    public void visitEnclosingMethodAttrInfo(ClassFile classFile, EnclosingMethodAttrInfo enclosingMethodAttrInfo)    {        if (enclosingMethodAttrInfo.u2nameAndTypeIndex != 0)        {            markNameAndTypeCpEntry(classFile, enclosingMethodAttrInfo.u2nameAndTypeIndex);        }    }    // Small utility methods.    /**     * Marks the given UTF-8 constant pool entry of the given class.     */    private void markNameAndTypeCpEntry(ClassFile classFile, int index)    {         markAsUsed((NameAndTypeCpInfo)((ProgramClassFile)classFile).getCpEntry(index));    }    /**     * Marks the given VisitorAccepter as being used.     * In this context, the VisitorAccepter will be a NameAndTypeCpInfo object.     */    private static void markAsUsed(VisitorAccepter visitorAccepter)    {        visitorAccepter.setVisitorInfo(USED);    }    /**     * Returns whether the given VisitorAccepter has been marked as being used.     * In this context, the VisitorAccepter will be a NameAndTypeCpInfo object.     */    static boolean isUsed(VisitorAccepter visitorAccepter)    {        return visitorAccepter.getVisitorInfo() == USED;    }}