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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2014 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.constant.*;
import proguard.classfile.constant.visitor.ConstantVisitor;
/**
* This ConstantVisitor initializes any class references of all string constants
* it visits. More specifically, it fills out the references of string constant
* pool entries that happen to refer to a class in the program class pool or in
* the library class pool.
*
* @author Eric Lafortune
*/
public class StringReferenceInitializer
extends SimplifiedVisitor
implements ConstantVisitor
{
private final ClassPool programClassPool;
private final ClassPool libraryClassPool;
/**
* Creates a new StringReferenceInitializer.
*/
public StringReferenceInitializer(ClassPool programClassPool,
ClassPool libraryClassPool)
{
this.programClassPool = programClassPool;
this.libraryClassPool = libraryClassPool;
}
// Implementations for ConstantVisitor.
public void visitAnyConstant(Clazz clazz, Constant constant) {}
public void visitStringConstant(Clazz clazz, StringConstant stringConstant)
{
if (stringConstant.referencedClass == null)
{
// See if we can find the referenced class.
stringConstant.referencedClass =
findClass(ClassUtil.internalClassName(
ClassUtil.externalBaseType(stringConstant.getString(clazz))));
}
}
// Small utility methods.
/**
* Returns the class with the given name, either for the program class pool
* or from the library class pool, or <code>null</code> if it can't be found.
*/
private Clazz findClass(String name)
{
// First look for the class in the program class pool.
Clazz clazz = programClassPool.getClass(name);
// Otherwise look for the class in the library class pool.
if (clazz == null)
{
clazz = libraryClassPool.getClass(name);
}
return clazz;
}
}
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