Ant example source code file (ChangeLogWriter.java)

This example Ant source code file (ChangeLogWriter.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

cvsentry, cvsentry, dom, dom_writer, domelementwriter, element, element, io, ioexception, ioexception, printwriter, rcsfile, simpledateformat, simpledateformat, string, text, utf-8, util

The ChangeLogWriter.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.taskdefs.cvslib;

import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Enumeration;
import java.util.TimeZone;

import org.apache.tools.ant.util.DOMElementWriter;
import org.apache.tools.ant.util.DOMUtils;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

/**
 * Class used to generate an XML changelog.
 *
 */
public class ChangeLogWriter {
    /** output format for dates written to xml file */
    private static final SimpleDateFormat OUTPUT_DATE
        = new SimpleDateFormat("yyyy-MM-dd");
    /** output format for times written to xml file */
    private static final SimpleDateFormat OUTPUT_TIME
        = new SimpleDateFormat("HH:mm");
    /** stateless helper for writing the XML document */
    private static final DOMElementWriter DOM_WRITER = new DOMElementWriter();

    static {
        TimeZone utc = TimeZone.getTimeZone("UTC");
        OUTPUT_DATE.setTimeZone(utc);
        OUTPUT_TIME.setTimeZone(utc);
    }

    /**
     * Print out the specified entries.
     *
     * @param output writer to which to send output.
     * @param entries the entries to be written.
     */
    public void printChangeLog(final PrintWriter output,
                               final CVSEntry[] entries) {
        try {
            output.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
            Document doc = DOMUtils.newDocument();
            Element root = doc.createElement("changelog");
            DOM_WRITER.openElement(root, output, 0, "\t");
            output.println();
            for (int i = 0; i < entries.length; i++) {
                final CVSEntry entry = entries[i];

                printEntry(doc, output, entry);
            }
            DOM_WRITER.closeElement(root, output, 0, "\t", true);
            output.flush();
            output.close();
        } catch (IOException e) {
            throw new org.apache.tools.ant.BuildException(e);
        }
    }


    /**
     * Print out an individual entry in changelog.
     *
     * @param doc Document used to create elements.
     * @param entry the entry to print
     * @param output writer to which to send output.
     */
    private void printEntry(Document doc, final PrintWriter output,
                            final CVSEntry entry) throws IOException {
        Element ent = doc.createElement("entry");
        DOMUtils.appendTextElement(ent, "date",
                                   OUTPUT_DATE.format(entry.getDate()));
        DOMUtils.appendTextElement(ent, "time",
                                   OUTPUT_TIME.format(entry.getDate()));
        DOMUtils.appendCDATAElement(ent, "author", entry.getAuthor());

        final Enumeration enumeration = entry.getFiles().elements();

        while (enumeration.hasMoreElements()) {
            final RCSFile file = (RCSFile) enumeration.nextElement();

            Element f = DOMUtils.createChildElement(ent, "file");
            DOMUtils.appendCDATAElement(f, "name", file.getName());
            DOMUtils.appendTextElement(f, "revision", file.getRevision());

            final String previousRevision = file.getPreviousRevision();
            if (previousRevision != null) {
                DOMUtils.appendTextElement(f, "prevrevision",
                                           previousRevision);
            }
        }
        DOMUtils.appendCDATAElement(ent, "msg", entry.getComment());
        DOM_WRITER.write(ent, output, 1, "\t");
    }
}