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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.attribute;
import proguard.classfile.*;
import proguard.classfile.attribute.visitor.AttributeVisitor;
/**
* This abstract class represents an attribute that is attached to a class,
* a class member, or a code attribute. Specific types of attributes are
* subclassed from it.
*
* @author Eric Lafortune
* @noinspection AbstractClassWithoutAbstractMethods
*/
public abstract class Attribute implements VisitorAccepter
{
public int u2attributeNameIndex;
//public int u4attributeLength;
//public byte info[];
/**
* An extra field in which visitors can store information.
*/
public Object visitorInfo;
/**
* Create an uninitialized Attribute.
*/
protected Attribute()
{
}
/**
* Create an initialized Attribute.
*/
protected Attribute(int u2attributeNameIndex)
{
this.u2attributeNameIndex = u2attributeNameIndex;
}
/**
* Returns the String name of the attribute.
*/
public String getAttributeName(Clazz clazz)
{
return clazz.getString(u2attributeNameIndex);
}
// Methods to be implemented by extensions, if applicable.
/**
* Accepts the given visitor.
*/
public void accept(Clazz clazz, AttributeVisitor attributeVisitor)
{
throw new UnsupportedOperationException("Method must be overridden in ["+this.getClass().getName()+"] if ever called");
}
/**
* Accepts the given visitor in the context of the given field.
*/
public void accept(Clazz clazz, Field field, AttributeVisitor attributeVisitor)
{
// Delegate to the default invocation if the field is null anyway.
if (field == null)
{
accept(clazz, attributeVisitor);
}
else
{
throw new UnsupportedOperationException("Method must be overridden in ["+this.getClass().getName()+"] if ever called");
}
}
/**
* Accepts the given visitor in the context of the given method.
*/
public void accept(Clazz clazz, Method method, AttributeVisitor attributeVisitor)
{
// Delegate to the default invocation if the method is null anyway.
if (method == null)
{
accept(clazz, (Field)null, attributeVisitor);
}
else
{
throw new UnsupportedOperationException("Method must be overridden in ["+this.getClass().getName()+"] if ever called");
}
}
/**
* Accepts the given visitor in the context of the given code attribute.
*/
public void accept(Clazz clazz, Method method, CodeAttribute codeAttribute, AttributeVisitor attributeVisitor)
{
// Delegate to the default invocation if the code attribute is null
// anyway.
if (codeAttribute == null)
{
accept(clazz, method, attributeVisitor);
}
else
{
throw new UnsupportedOperationException("Method must be overridden in ["+this.getClass().getName()+"] if ever called");
}
}
// Implementations for VisitorAccepter.
public Object getVisitorInfo()
{
return visitorInfo;
}
public void setVisitorInfo(Object visitorInfo)
{
this.visitorInfo = visitorInfo;
}
}
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