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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.ClassConstant;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.visitor.ClassVisitor;
/**
* This ClassVisitor initializes the superclass hierarchy of all classes that
* it visits.
* <p>
* Visited library classes get direct references to their superclasses and
* interfaces, replacing the superclass names and interface names. The direct
* references are equivalent to the names, but they are more efficient to work
* with.
* <p>
* This visitor optionally prints warnings if some superclasses can't be found
* or if they are in the program class pool.
*
* @author Eric Lafortune
*/
public class ClassSuperHierarchyInitializer
extends SimplifiedVisitor
implements ClassVisitor,
ConstantVisitor
{
private final ClassPool programClassPool;
private final ClassPool libraryClassPool;
private final WarningPrinter missingWarningPrinter;
private final WarningPrinter dependencyWarningPrinter;
/**
* Creates a new ClassSuperHierarchyInitializer that initializes the super
* hierarchy of all visited class files, optionally printing warnings if
* some classes can't be found or if they are in the program class pool.
*/
public ClassSuperHierarchyInitializer(ClassPool programClassPool,
ClassPool libraryClassPool,
WarningPrinter missingWarningPrinter,
WarningPrinter dependencyWarningPrinter)
{
this.programClassPool = programClassPool;
this.libraryClassPool = libraryClassPool;
this.missingWarningPrinter = missingWarningPrinter;
this.dependencyWarningPrinter = dependencyWarningPrinter;
}
// Implementations for ClassVisitor.
public void visitProgramClass(ProgramClass programClass)
{
// Link to the super class.
programClass.superClassConstantAccept(this);
// Link to the interfaces.
programClass.interfaceConstantsAccept(this);
}
public void visitLibraryClass(LibraryClass libraryClass)
{
String className = libraryClass.getName();
// Link to the super class.
String superClassName = libraryClass.superClassName;
if (superClassName != null)
{
// Keep a reference to the superclass.
libraryClass.superClass = findClass(className, superClassName);
}
// Link to the interfaces.
if (libraryClass.interfaceNames != null)
{
String[] interfaceNames = libraryClass.interfaceNames;
Clazz[] interfaceClasses = new Clazz[interfaceNames.length];
for (int index = 0; index < interfaceNames.length; index++)
{
// Keep a reference to the interface class.
interfaceClasses[index] =
findClass(className, interfaceNames[index]);
}
libraryClass.interfaceClasses = interfaceClasses;
}
}
// Implementations for ConstantVisitor.
public void visitClassConstant(Clazz clazz, ClassConstant classConstant)
{
classConstant.referencedClass =
findClass(clazz.getName(), classConstant.getName(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 referencingClassName, 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);
if (clazz == null &&
missingWarningPrinter != null)
{
// We didn't find the superclass or interface. Print a warning.
missingWarningPrinter.print(referencingClassName,
name,
"Warning: " +
ClassUtil.externalClassName(referencingClassName) +
": can't find superclass or interface " +
ClassUtil.externalClassName(name));
}
}
else if (dependencyWarningPrinter != null)
{
// The superclass or interface was found in the program class pool.
// Print a warning.
dependencyWarningPrinter.print(referencingClassName,
name,
"Warning: library class " +
ClassUtil.externalClassName(referencingClassName) +
" extends or implements program class " +
ClassUtil.externalClassName(name));
}
return clazz;
}
}
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