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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.

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/*
 * Javassist, a Java-bytecode translator toolkit.
 * Copyright (C) 1999- 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,
 * or the Apache License Version 2.0.
 *
 * 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 com.feilong.lib.javassist.compiler.ast;

import java.io.Serializable;

import com.feilong.lib.javassist.compiler.CompileError;

/**
 * Abstract Syntax Tree. An ASTree object represents a node of
 * a binary tree. If the node is a leaf node, both getLeft()
 * and getRight() returns null.
 */
public abstract class ASTree implements Serializable{

    /** default serialVersionUID */
    private static final long serialVersionUID = 1L;

    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
     * atXXX() on the given visitor, where
     * XXX is the class name of the node object.
     */
    public abstract void accept(Visitor v) throws CompileError;

    @Override
    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
     * toString().
     */
    protected String getTag(){
        String name = getClass().getName();
        return name.substring(name.lastIndexOf('.') + 1);
    }
}