Ant example source code file (Socket.java)

This example Ant source code file (Socket.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

buildexception, buildexception, checking, condition, io, ioexception, ioexception, no, no, projectcomponent, socket, string, string

The Socket.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.condition;

import java.io.IOException;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.ProjectComponent;

/**
 * Condition to wait for a TCP/IP socket to have a listener. Its attributes are:
 *   server - the name of the server.
 *   port - the port number of the socket.
 *
 * @since Ant 1.5
 */
public class Socket extends ProjectComponent implements Condition {
    private String server = null;
    private int port = 0;

    /**
     * Set the server attribute
     *
     * @param server the server name
     */
    public void setServer(String server) {
        this.server = server;
    }

    /**
     * Set the port attribute
     *
     * @param port the port number of the socket
     */
    public void setPort(int port) {
        this.port = port;
    }

    /**
     * @return true if a socket can be created
     * @exception BuildException if the attributes are not set
     */
    public boolean eval() throws BuildException {
        if (server == null) {
            throw new BuildException("No server specified in socket "
                                     + "condition");
        }
        if (port == 0) {
            throw new BuildException("No port specified in socket condition");
        }
        log("Checking for listener at " + server + ":" + port,
            Project.MSG_VERBOSE);
        java.net.Socket s = null;
        try {
            s = new java.net.Socket(server, port);
        } catch (IOException e) {
            return false;
        } finally {
          if (s != null) {
            try {
              s.close();
            } catch (IOException ioe) {
              // Intentionally left blank
            }
          }
        }
        return true;
    }

}