| /* |
| * ProGuard -- shrinking, optimization, obfuscation, and preverification |
| * of Java bytecode. |
| * |
| * Copyright (c) 2002-2009 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.classfile.util; |
| |
| import proguard.classfile.*; |
| import proguard.classfile.attribute.Attribute; |
| import proguard.classfile.attribute.visitor.AttributeVisitor; |
| import proguard.classfile.constant.*; |
| import proguard.classfile.constant.visitor.ConstantVisitor; |
| import proguard.classfile.visitor.ClassVisitor; |
| |
| /** |
| * This ClassVisitor shares strings in the class files that it visits. |
| * |
| * @author Eric Lafortune |
| */ |
| public class StringSharer |
| extends SimplifiedVisitor |
| implements ClassVisitor, |
| ConstantVisitor, |
| AttributeVisitor |
| { |
| // A fields acting as an argument for the visitor methods. |
| private String name; |
| private String type; |
| |
| |
| // Implementations for ClassVisitor. |
| |
| public void visitProgramClass(ProgramClass programClass) |
| { |
| // Replace name strings in the constant pool by shared strings. |
| programClass.constantPoolEntriesAccept(this); |
| |
| // Replace attribute name strings in the constant pool by internalized |
| // strings. |
| programClass.attributesAccept(this); |
| } |
| |
| |
| public void visitLibraryClass(LibraryClass libraryClass) |
| { |
| // Replace the super class name string by the shared name string. |
| Clazz superClass = libraryClass.superClass; |
| if (superClass != null) |
| { |
| libraryClass.superClassName = superClass.getName(); |
| } |
| } |
| |
| |
| // Implementations for ConstantVisitor. |
| |
| |
| public void visitAnyConstant(Clazz clazz, Constant constant) {} |
| |
| |
| public void visitAnyStringConstant(Clazz clazz, StringConstant stringConstant) |
| { |
| Member referencedMember = stringConstant.referencedMember; |
| if (referencedMember != null) |
| { |
| Clazz referencedClass = stringConstant.referencedClass; |
| |
| // Put the actual class member's name in the class pool. |
| name = referencedMember.getName(referencedClass); |
| clazz.constantPoolEntryAccept(stringConstant.u2stringIndex, this); |
| } |
| } |
| |
| |
| public void visitAnyRefConstant(Clazz clazz, RefConstant refConstant) |
| { |
| Member referencedMember = refConstant.referencedMember; |
| if (referencedMember != null) |
| { |
| Clazz referencedClass = refConstant.referencedClass; |
| |
| // Put the actual class member's name and type strings in the class |
| // pool. |
| name = referencedMember.getName(referencedClass); |
| type = referencedMember.getDescriptor(referencedClass); |
| clazz.constantPoolEntryAccept(refConstant.u2nameAndTypeIndex, this); |
| } |
| } |
| |
| |
| public void visitNameAndTypeConstant(Clazz clazz, NameAndTypeConstant nameAndTypeConstant) |
| { |
| if (name != null) |
| { |
| // Put the actual class member's name and type strings in the class |
| // pool. |
| clazz.constantPoolEntryAccept(nameAndTypeConstant.u2nameIndex, this); |
| name = type; |
| clazz.constantPoolEntryAccept(nameAndTypeConstant.u2descriptorIndex, this); |
| } |
| } |
| |
| |
| public void visitClassConstant(Clazz clazz, ClassConstant classConstant) |
| { |
| Clazz referencedClass = classConstant.referencedClass; |
| if (referencedClass != null) |
| { |
| // Put the actual class's name string in the class pool. |
| name = referencedClass.getName(); |
| clazz.constantPoolEntryAccept(classConstant.u2nameIndex, this); |
| } |
| } |
| |
| |
| public void visitUtf8Constant(Clazz clazz, Utf8Constant utf8Constant) |
| { |
| // Do we have a new string to put into this constant? |
| if (name != null) |
| { |
| // Replace the string, if it's actually the same. |
| if (name.equals(utf8Constant.getString())) |
| { |
| utf8Constant.setString(name); |
| } |
| |
| name = null; |
| } |
| } |
| |
| |
| // Implementations for AttributeVisitor. |
| |
| public void visitAnyAttribute(Clazz clazz, Attribute attribute) |
| { |
| // Put the internalized attribute's name string in the class pool. |
| name = attribute.getAttributeName(clazz).intern(); |
| clazz.constantPoolEntryAccept(attribute.u2attributeNameIndex, this); |
| } |
| } |