Ant example source code file (CvsVersion.java)

This example Ant source code file (CvsVersion.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

abstractcvstask, bytearrayoutputstream, bytearrayoutputstream, client, cvs, cvsversion, io, multiply, multiply, server, string, string, stringtokenizer, stringtokenizer, util, version_1_11_2

The CvsVersion.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 org.apache.tools.ant.taskdefs.AbstractCvsTask;

import java.io.ByteArrayOutputStream;
import java.util.StringTokenizer;

/**
 * this task allows to find out the client and the server version of a
 * CVS installation
 *
 * example usage :
 * <cvsversion
 * cvsRoot=":pserver:anoncvs@cvs.apache.org:/home/cvspublic"
 * passfile="c:/programme/cygwin/home/antoine/.cvspass"
 * clientversionproperty="apacheclient"
 * serverversionproperty="apacheserver"   />
 *
 * the task can be used also in the API by calling its execute method,
 * then calling getServerVersion and/or getClientVersion
 *
 * @ant.task category="scm"
 * @since ant 1.6.1
 */
public class CvsVersion extends AbstractCvsTask {
    static final long VERSION_1_11_2 = 11102;
    static final long MULTIPLY = 100;
    private String clientVersion;
    private String serverVersion;
    private String clientVersionProperty;
    private String serverVersionProperty;

    /**
     * Get the CVS client version
     * @return CVS client version
     */
    public String getClientVersion() {
        return clientVersion;
    }
    /**
     * Get the CVS server version
     * @return CVS server version
     */
    public String getServerVersion() {
        return serverVersion;
    }
    /**
     * Set a property where to store the CVS client version
     * @param clientVersionProperty  property for CVS client version
     */
    public void setClientVersionProperty(String clientVersionProperty) {
        this.clientVersionProperty = clientVersionProperty;
    }

    /**
     * Set a property where to store the CVS server version
     * @param serverVersionProperty  property for CVS server version
     */
    public void setServerVersionProperty(String serverVersionProperty) {
        this.serverVersionProperty = serverVersionProperty;
    }
    /**
     * Find out if the server version supports log with S option
     * @return  boolean indicating if the server version supports log with S option
     */
    public boolean supportsCvsLogWithSOption() {
        if (serverVersion == null) {
            return false;
        }
        StringTokenizer tokenizer = new StringTokenizer(serverVersion, ".");
        long counter = MULTIPLY * MULTIPLY;
        long version = 0;
        while (tokenizer.hasMoreTokens()) {
            String s = tokenizer.nextToken();
            int i = 0;
            for (i = 0; i < s.length(); i++) {
                if (!Character.isDigit(s.charAt(i))) {
                    break;
                }
            }
            String s2 = s.substring(0, i);
            version = version + counter * Long.parseLong(s2);
            if (counter == 1) {
                break;
            }
            counter = counter / MULTIPLY;
        }
        return (version >= VERSION_1_11_2);
    }
    /**
     * the execute method running CvsVersion
     */
    public void execute() {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        this.setOutputStream(bos);
        ByteArrayOutputStream berr = new ByteArrayOutputStream();
        this.setErrorStream(berr);
        setCommand("version");
        super.execute();
        String output = bos.toString();
        StringTokenizer st = new StringTokenizer(output);
        boolean client = false;
        boolean server = false;
        boolean cvs = false;
        while (st.hasMoreTokens()) {
            String currentToken = st.nextToken();
            if (currentToken.equals("Client:")) {
                client = true;
            } else if (currentToken.equals("Server:")) {
                server = true;
            } else if (currentToken.equals("(CVS)")) {
                cvs = true;
            }
            if (client && cvs) {
                if (st.hasMoreTokens()) {
                    clientVersion = st.nextToken();
                }
                client = false;
                cvs = false;
            } else if (server && cvs) {
                if (st.hasMoreTokens()) {
                    serverVersion = st.nextToken();
                }
                server = false;
                cvs = false;
            }

        }
        if (clientVersionProperty != null) {
            getProject().setNewProperty(clientVersionProperty, clientVersion);
        }
        if (serverVersionProperty != null) {
            getProject().setNewProperty(serverVersionProperty, serverVersion);
        }
    }
}