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/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999-2003 Shigeru Chiba. All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*/
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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