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/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999-2005 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);
}
}
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