Ant example source code file (SplashTask.java)

This example Ant source code file (SplashTask.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, bytearrayoutputstream, classloader, connection, datainputstream, gui, io, net, network, splashscreen, splashscreen, string, string, swing, throwable, url, url, using

The SplashTask.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.optional.splash;

import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import javax.swing.ImageIcon;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.util.Base64Converter;

/**
 * Creates a splash screen. The splash screen is displayed
 * for the duration of the build and includes a handy progress bar as
 * well. Use in conjunction with the sound task to provide interest
 * whilst waiting for your builds to complete...
 * @since Ant1.5
 */
public class SplashTask extends Task {

    private String imgurl = null;
    private String proxy = null;
    private String user = null;
    private String password = null;
    private String port = "80";
    private int showDuration = 5000;
    private boolean useProxy = false;

    private static SplashScreen splash = null;

    /**
     * A URL pointing to an image to display; optional, default antlogo.gif
     * from the classpath.
     * @param imgurl the url string pointing to the image
     */
    public void setImageURL(String imgurl) {
        this.imgurl = imgurl;
    }

    /**
     * flag to enable proxy settings; optional, deprecated : consider
     * using <setproxy> instead
     * @param useProxy if ture, enable proxy settings
     * @deprecated since 1.5.x.
     *             Use org.apache.tools.ant.taskdefs.optional.SetProxy
     */
    public void setUseproxy(boolean useProxy) {
        this.useProxy = useProxy;
    }

    /**
     * name of proxy; optional.
     * @param proxy the name of the proxy host
     */
    public void setProxy(String proxy) {
        this.proxy = proxy;
    }

    /**
     * Proxy port; optional, default 80.
     * @param port the proxy port
     */
    public void setPort(String port) {
        this.port = port;
    }

    /**
     * Proxy user; optional, default =none.
     * @param user the proxy user
     */
    public void setUser(String user) {
        this.user = user;
    }

    /**
     * Proxy password; required if <tt>user is set.
     * @param password the proxy password
     */
    public void setPassword(String password) {
        this.password = password;
    }

    /**
     * how long to show the splash screen in milliseconds,
     * optional; default 5000 ms.
     * @param duration the spash duration in milliseconds
     */
    public void setShowduration(int duration) {
        this.showDuration = duration;
    }


    /**
     * Execute the task.
     * @throws BuildException on error
     */
    public void execute() throws BuildException {
        if (splash != null) {
            splash.setVisible(false);
            getProject().removeBuildListener(splash);
            splash.dispose();
            splash = null;
        }

        log("Creating new SplashScreen", Project.MSG_VERBOSE);
        InputStream in = null;

        if (imgurl != null) {
            try {
                URLConnection conn = null;

                if (useProxy && (proxy != null && proxy.length() > 0)
                    && (port != null && port.length() > 0)) {

                    log("Using proxied Connection",  Project.MSG_DEBUG);
                    System.getProperties().put("http.proxySet", "true");
                    System.getProperties().put("http.proxyHost", proxy);
                    System.getProperties().put("http.proxyPort", port);

                    URL url = new URL(imgurl);

                    conn = url.openConnection();
                    if (user != null && user.length() > 0) {
                        // converted from sun internal classes to
                        // new Base64Converter
                        // utility class extracted from Get task
                        String encodedcreds =
                            new Base64Converter().encode(user + ":" + password);
                        conn.setRequestProperty("Proxy-Authorization",
                                                encodedcreds);
                    }

                } else {
                    System.getProperties().put("http.proxySet", "false");
                    System.getProperties().put("http.proxyHost", "");
                    System.getProperties().put("http.proxyPort", "");
                    log("Using Direction HTTP Connection", Project.MSG_DEBUG);
                    URL url = new URL(imgurl);
                    conn = url.openConnection();
                }
                conn.setDoInput(true);
                conn.setDoOutput(false);

                in = conn.getInputStream();

                // Catch everything - some of the above return nulls,
                // throw exceptions or generally misbehave
                // in the event of a problem etc

            } catch (Throwable ioe) {
                log("Unable to download image, trying default Ant Logo",
                    Project.MSG_DEBUG);
                log("(Exception was \"" + ioe.getMessage() + "\"",
                    Project.MSG_DEBUG);
            }
        }

        if (in == null) {
            ClassLoader cl = SplashTask.class.getClassLoader();
            if (cl != null) {
                in = cl.getResourceAsStream("images/ant_logo_large.gif");
            } else {
                in = ClassLoader
                    .getSystemResourceAsStream("images/ant_logo_large.gif");
            }
        }

        boolean success = false;
        if (in != null) {
            DataInputStream din = new DataInputStream(in);
            try {
                ByteArrayOutputStream bout = new ByteArrayOutputStream();
                int data;
                while ((data = din.read()) != -1) {
                    bout.write((byte) data);
                }

                log("Got ByteArray, creating splash",  Project.MSG_DEBUG);

                try {
                    ImageIcon img = new ImageIcon(bout.toByteArray());
                    splash = new SplashScreen(img);
                    success = true;
                } catch (Throwable e) {
                    logHeadless(e);
                }
            } catch (Exception e) {
                throw new BuildException(e);
            } finally {
                try {
                    din.close();
                } catch (IOException ioe) {
                    // swallow if there was an error before so that
                    // original error will be passed up
                    if (success) {
                        throw new BuildException(ioe);
                    }
                }
            }
        } else {
            try {
                splash = new SplashScreen("Image Unavailable.");
                success = true;
            } catch (Throwable e) {
                logHeadless(e);
            }
        }

        if (success) {
            splash.setVisible(true);
            splash.toFront();
            getProject().addBuildListener(splash);
            try {
                Thread.sleep(showDuration);
            } catch (InterruptedException e) {
                // Ignore Exception
            }
        }
    }

    private void logHeadless(Throwable e) {
        log("failed to display SplashScreen, caught "
            + e.getClass().getName() + " with message: " + e.getMessage(),
            Project.MSG_WARN);
    }
}