proguard.classfile.LibraryClass Maven / Gradle / Ivy
/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2018 GuardSquare NV
*
* 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;
import proguard.classfile.attribute.visitor.AttributeVisitor;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.util.*;
import proguard.classfile.visitor.*;
/**
* This Clazz is a compact representation of the essential data in a Java class.
*
* @author Eric Lafortune
*/
public class LibraryClass implements Clazz
{
public int u2accessFlags;
public String thisClassName;
public String superClassName;
public String[] interfaceNames;
public LibraryField[] fields;
public LibraryMethod[] methods;
/**
* An extra field pointing to the superclass of this class.
* This field is filled out by the {@link ClassSuperHierarchyInitializer}.
*/
public Clazz superClass;
/**
* An extra field pointing to the interfaces of this class.
* This field is filled out by the {@link ClassSuperHierarchyInitializer}.
*/
public Clazz[] interfaceClasses;
/**
* An extra field pointing to the subclasses of this class.
* This field is filled out by the {@link ClassSubHierarchyInitializer}.
*/
public Clazz[] subClasses;
/**
* An extra field in which visitors can store information.
*/
public Object visitorInfo;
/**
* Creates an empty LibraryClass.
*/
public LibraryClass() {}
/**
* Returns whether this library class is visible to the outside world.
*/
boolean isVisible()
{
return (u2accessFlags & ClassConstants.ACC_PUBLIC) != 0;
}
// Implementations for Clazz.
public int getAccessFlags()
{
return u2accessFlags;
}
public String getName()
{
return thisClassName;
}
public String getSuperName()
{
// This may be java/lang/Object, in which case there is no super.
return superClassName;
}
public int getInterfaceCount()
{
return interfaceClasses.length;
}
public String getInterfaceName(int index)
{
return interfaceNames[index];
}
public int getTag(int constantIndex)
{
throw new UnsupportedOperationException("Library class ["+thisClassName+"] doesn't store constant pool");
}
public String getString(int constantIndex)
{
throw new UnsupportedOperationException("Library class ["+thisClassName+"] doesn't store constant pool");
}
public String getStringString(int constantIndex)
{
throw new UnsupportedOperationException("Library class ["+thisClassName+"] doesn't store constant pool");
}
public String getClassName(int constantIndex)
{
throw new UnsupportedOperationException("Library class ["+thisClassName+"] doesn't store constant pool");
}
public String getName(int constantIndex)
{
throw new UnsupportedOperationException("Library class ["+thisClassName+"] doesn't store constant pool");
}
public String getType(int constantIndex)
{
throw new UnsupportedOperationException("Library class ["+thisClassName+"] doesn't store constant pool");
}
public String getRefClassName(int constantIndex)
{
throw new UnsupportedOperationException("Library class ["+thisClassName+"] doesn't store constant pool");
}
public String getRefName(int constantIndex)
{
throw new UnsupportedOperationException("Library class ["+thisClassName+"] doesn't store constant pool");
}
public String getRefType(int constantIndex)
{
throw new UnsupportedOperationException("Library class ["+thisClassName+"] doesn't store constant pool");
}
public void addSubClass(Clazz clazz)
{
if (subClasses == null)
{
subClasses = new Clazz[1];
}
else
{
// Copy the old elements into new larger array.
Clazz[] temp = new Clazz[subClasses.length+1];
System.arraycopy(subClasses, 0, temp, 0, subClasses.length);
subClasses = temp;
}
subClasses[subClasses.length-1] = clazz;
}
public Clazz getSuperClass()
{
return superClass;
}
public Clazz getInterface(int index)
{
return interfaceClasses[index];
}
public boolean extends_(Clazz clazz)
{
if (this.equals(clazz))
{
return true;
}
return superClass != null &&
superClass.extends_(clazz);
}
public boolean extends_(String className)
{
if (getName().equals(className))
{
return true;
}
return superClass != null &&
superClass.extends_(className);
}
public boolean extendsOrImplements(Clazz clazz)
{
if (this.equals(clazz))
{
return true;
}
if (superClass != null &&
superClass.extendsOrImplements(clazz))
{
return true;
}
if (interfaceClasses != null)
{
for (int index = 0; index < interfaceClasses.length; index++)
{
Clazz interfaceClass = interfaceClasses[index];
if (interfaceClass != null &&
interfaceClass.extendsOrImplements(clazz))
{
return true;
}
}
}
return false;
}
public boolean extendsOrImplements(String className)
{
if (getName().equals(className))
{
return true;
}
if (superClass != null &&
superClass.extendsOrImplements(className))
{
return true;
}
if (interfaceClasses != null)
{
for (int index = 0; index < interfaceClasses.length; index++)
{
Clazz interfaceClass = interfaceClasses[index];
if (interfaceClass != null &&
interfaceClass.extendsOrImplements(className))
{
return true;
}
}
}
return false;
}
public Field findField(String name, String descriptor)
{
for (int index = 0; index < fields.length; index++)
{
Field field = fields[index];
if (field != null &&
(name == null || field.getName(this).equals(name)) &&
(descriptor == null || field.getDescriptor(this).equals(descriptor)))
{
return field;
}
}
return null;
}
public Method findMethod(String name, String descriptor)
{
for (int index = 0; index < methods.length; index++)
{
Method method = methods[index];
if (method != null &&
(name == null || method.getName(this).equals(name)) &&
(descriptor == null || method.getDescriptor(this).equals(descriptor)))
{
return method;
}
}
return null;
}
public void accept(ClassVisitor classVisitor)
{
classVisitor.visitLibraryClass(this);
}
public void hierarchyAccept(boolean visitThisClass,
boolean visitSuperClass,
boolean visitInterfaces,
boolean visitSubclasses,
ClassVisitor classVisitor)
{
// First visit the current classfile.
if (visitThisClass)
{
accept(classVisitor);
}
// Then visit its superclass, recursively.
if (visitSuperClass)
{
if (superClass != null)
{
superClass.hierarchyAccept(true,
true,
visitInterfaces,
false,
classVisitor);
}
}
// Then visit its interfaces, recursively.
if (visitInterfaces)
{
// Visit the interfaces of the superclasses, if we haven't done so yet.
if (!visitSuperClass)
{
if (superClass != null)
{
superClass.hierarchyAccept(false,
false,
true,
false,
classVisitor);
}
}
// Visit the interfaces.
if (interfaceClasses != null)
{
for (int index = 0; index < interfaceClasses.length; index++)
{
Clazz interfaceClass = interfaceClasses[index];
if (interfaceClass != null)
{
interfaceClass.hierarchyAccept(true,
false,
true,
false,
classVisitor);
}
}
}
}
// Then visit its subclasses, recursively.
if (visitSubclasses)
{
if (subClasses != null)
{
for (int index = 0; index < subClasses.length; index++)
{
subClasses[index].hierarchyAccept(true,
false,
false,
true,
classVisitor);
}
}
}
}
/**
* Lets the given class visitor visit the superclass, if it is known.
* @param classVisitor the ClassVisitor that will visit the
* superclass.
*/
public void superClassAccept(ClassVisitor classVisitor)
{
if (superClass != null)
{
superClass.accept(classVisitor);
}
}
/**
* Lets the given class visitor visit all known direct interfaces.
* @param classVisitor the ClassVisitor that will visit the
* interfaces.
*/
public void interfacesAccept(ClassVisitor classVisitor)
{
if (interfaceClasses != null)
{
for (int index = 0; index < interfaceClasses.length; index++)
{
Clazz interfaceClass = interfaceClasses[index];
if (interfaceClass != null)
{
interfaceClass.accept(classVisitor);
}
}
}
}
public void subclassesAccept(ClassVisitor classVisitor)
{
if (subClasses != null)
{
for (int index = 0; index < subClasses.length; index++)
{
subClasses[index].accept(classVisitor);
}
}
}
public void constantPoolEntriesAccept(ConstantVisitor constantVisitor)
{
// This class doesn't keep references to its constant pool entries.
}
public void constantPoolEntryAccept(int index, ConstantVisitor constantVisitor)
{
// This class doesn't keep references to its constant pool entries.
}
public void thisClassConstantAccept(ConstantVisitor constantVisitor)
{
// This class doesn't keep references to its constant pool entries.
}
public void superClassConstantAccept(ConstantVisitor constantVisitor)
{
// This class doesn't keep references to its constant pool entries.
}
public void interfaceConstantsAccept(ConstantVisitor constantVisitor)
{
// This class doesn't keep references to its constant pool entries.
}
public void fieldsAccept(MemberVisitor memberVisitor)
{
for (int index = 0; index < fields.length; index++)
{
Field field = fields[index];
if (field != null)
{
field.accept(this, memberVisitor);
}
}
}
public void fieldAccept(String name, String descriptor, MemberVisitor memberVisitor)
{
Field field = findField(name, descriptor);
if (field != null)
{
field.accept(this, memberVisitor);
}
}
public void methodsAccept(MemberVisitor memberVisitor)
{
for (int index = 0; index < methods.length; index++)
{
Method method = methods[index];
if (method != null)
{
method.accept(this, memberVisitor);
}
}
}
public void methodAccept(String name, String descriptor, MemberVisitor memberVisitor)
{
Method method = findMethod(name, descriptor);
if (method != null)
{
method.accept(this, memberVisitor);
}
}
public boolean mayHaveImplementations(Method method)
{
return
(u2accessFlags & ClassConstants.ACC_FINAL) == 0 &&
(method == null ||
((method.getAccessFlags() & (ClassConstants.ACC_PRIVATE |
ClassConstants.ACC_STATIC |
ClassConstants.ACC_FINAL)) == 0 &&
!method.getName(this).equals(ClassConstants.METHOD_NAME_INIT)));
}
public void attributesAccept(AttributeVisitor attributeVisitor)
{
throw new UnsupportedOperationException("Library class ["+thisClassName+"] doesn't store attributes");
}
public void attributeAccept(String name, AttributeVisitor attributeVisitor)
{
throw new UnsupportedOperationException("Library class ["+thisClassName+"] doesn't store attributes");
}
// Implementations for VisitorAccepter.
public Object getVisitorInfo()
{
return visitorInfo;
}
public void setVisitorInfo(Object visitorInfo)
{
this.visitorInfo = visitorInfo;
}
// Implementations for Object.
public String toString()
{
return "LibraryClass("+getName()+")";
}
}
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