Groovy example source code file (NodePrinter.java)

This example Groovy source code file (NodePrinter.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Groovy tags/keywords

io, nodeprinter, nodeprinter, opening_visit, printstream, printstream, string, string, visitoradapter, visitoradapter

The Groovy NodePrinter.java source code

/*
 * Copyright 2003-2007 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.codehaus.groovy.antlr.treewalker;

import java.io.PrintStream;

import org.codehaus.groovy.antlr.GroovySourceAST;

/**
 * A simple antlr AST visitor that outputs the tokenName of each node in a pseudo xml style.
 *
 * @author <a href="mailto:groovy@ross-rayner.com">Jeremy Rayner
 * @version $Revision: 6778 $
 */

public class NodePrinter extends VisitorAdapter {
    private String[] tokenNames;
    private PrintStream out;

    /**
     * A visitor that prints a pseudo xml output to the supplied PrintStream
     * @param out supplied PrintStream to output nodes to
     * @param tokenNames an array of token names to use
     */
    public NodePrinter(PrintStream out,String[] tokenNames) {
        this.tokenNames = tokenNames;
        this.out = out;
    }

    public void visitDefault(GroovySourceAST t,int visit) {
        if (visit == OPENING_VISIT) {
            out.print("<"+ tokenNames[t.getType()] + ">");
        } else {
            out.print("</" + tokenNames[t.getType()] + ">");
        }
    }
}