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Ant example source code file (LineTokenizer.java)

This example Ant source code file (LineTokenizer.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 - Ant tags/keywords

io, ioexception, ioexception, linetokenizer, linetokenizer, projectcomponent, string, string, stringbuffer, stringbuffer, tokenizer

The LineTokenizer.java source code

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.apache.tools.ant.util;

import java.io.Reader;
import java.io.IOException;

import org.apache.tools.ant.ProjectComponent;

/**
 * class to tokenize the input as lines seperated
 * by \r (mac style), \r\n (dos/windows style) or \n (unix style)
 * @since Ant 1.6
 */
public class LineTokenizer extends ProjectComponent
    implements Tokenizer {
    private String  lineEnd = "";
    private int     pushed = -2;
    private boolean includeDelims = false;

    /**
     * attribute includedelims - whether to include
     * the line ending with the line, or to return
     * it in the posttoken
     * default false
     * @param includeDelims if true include /r and /n in the line
     */

    public void setIncludeDelims(boolean includeDelims) {
        this.includeDelims = includeDelims;
    }

    /**
     * get the next line from the input
     *
     * @param in the input reader
     * @return the line excluding /r or /n, unless includedelims is set
     * @exception IOException if an error occurs reading
     */
    public String getToken(Reader in) throws IOException {
        int ch = -1;
        if (pushed != -2) {
            ch = pushed;
            pushed = -2;
        } else {
            ch = in.read();
        }
        if (ch == -1) {
            return null;
        }

        lineEnd = "";
        StringBuffer line = new StringBuffer();

        int state = 0;
        while (ch != -1) {
            if (state == 0) {
                if (ch == '\r') {
                    state = 1;
                } else if (ch == '\n') {
                    lineEnd = "\n";
                    break;
                } else {
                    line.append((char) ch);
                }
            } else {
                state = 0;
                if (ch == '\n') {
                    lineEnd = "\r\n";
                } else {
                    pushed = ch;
                    lineEnd = "\r";
                }
                break;
            }
            ch = in.read();
        }
        if (ch == -1 && state == 1) {
            lineEnd = "\r";
        }

        if (includeDelims) {
            line.append(lineEnd);
        }
        return line.toString();
    }

    /**
     * @return the line ending character(s) for the current line
     */
    public String getPostToken() {
        if (includeDelims) {
            return "";
        }
        return lineEnd;
    }

}

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