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/*
* 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.attribute.annotation;
import proguard.classfile.*;
import proguard.classfile.attribute.annotation.visitor.ElementValueVisitor;
import proguard.classfile.visitor.MemberVisitor;
/**
* This abstract class represents an element value that is attached to an
* annotation or an annotation default. Specific types of element values are
* subclassed from it.
*
* @author Eric Lafortune
*/
public abstract class ElementValue implements VisitorAccepter
{
/**
* An extra field for the optional element name. It is used in element value
* pairs of annotations. Otherwise, it is 0.
*/
public int u2elementNameIndex;
/**
* An extra field pointing to the referenced <code>Clazz</code>
* object, if applicable. This field is typically filled out by the
* <code>{@link proguard.classfile.util.ClassReferenceInitializer}</code>.
*/
public Clazz referencedClass;
/**
* An extra field pointing to the referenced <code>Method</code>
* object, if applicable. This field is typically filled out by the
* <code>{@link proguard.classfile.util.ClassReferenceInitializer}</code>.
*/
public Method referencedMethod;
/**
* An extra field in which visitors can store information.
*/
public Object visitorInfo;
/**
* Creates an uninitialized ElementValue.
*/
protected ElementValue()
{
}
/**
* Creates an initialized ElementValue.
*/
protected ElementValue(int u2elementNameIndex)
{
this.u2elementNameIndex = u2elementNameIndex;
}
/**
* Returns the element name.
*/
public String getMethodName(Clazz clazz)
{
return clazz.getString(u2elementNameIndex);
}
// Abstract methods to be implemented by extensions.
/**
* Returns the tag of this element value.
*/
public abstract int getTag();
/**
* Accepts the given visitor.
*/
public abstract void accept(Clazz clazz, Annotation annotation, ElementValueVisitor elementValueVisitor);
/**
* Applies the given visitor to the referenced method.
*/
public void referencedMethodAccept(MemberVisitor memberVisitor)
{
if (referencedMethod != null)
{
referencedMethod.accept(referencedClass, memberVisitor);
}
}
// Implementations for VisitorAccepter.
public Object getVisitorInfo()
{
return visitorInfo;
}
public void setVisitorInfo(Object visitorInfo)
{
this.visitorInfo = visitorInfo;
}
}
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