/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999-2007 Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package javassist.compiler.ast;
import java.io.
Serializable;
import javassist.compiler.
CompileError;
/**
* Abstract Syntax Tree. An ASTree object represents a node of
* a binary tree. If the node is a leaf node, both <code>getLeft()</code>
* and <code>getRight()</code> returns null.
*/
public abstract class
ASTree implements
Serializable {
public
ASTree getLeft() { return null; }
public
ASTree getRight() { return null; }
public void
setLeft(
ASTree _left) {}
public void
setRight(
ASTree _right) {}
/**
* Is a method for the visitor pattern. It calls
* <code>atXXX()</code> on the given visitor, where
* <code>XXX</code> is the class name of the node object.
*/
public abstract void
accept(
Visitor v) throws
CompileError;
public
String toString() {
StringBuffer sbuf = new
StringBuffer();
sbuf.
append('<');
sbuf.
append(
getTag());
sbuf.
append('>');
return
sbuf.
toString();
}
/**
* Returns the type of this node. This method is used by
* <code>toString()</code>.
*/
protected
String getTag() {
String name =
getClass().
getName();
return
name.
substring(
name.
lastIndexOf('.') + 1);
}
}