1   /****************************************************************************
2    * This demo file is part of yFiles for Java 2.14.
3    * Copyright (c) 2000-2017 by yWorks GmbH, Vor dem Kreuzberg 28,
4    * 72070 Tuebingen, Germany. All rights reserved.
5    * 
6    * yFiles demo files exhibit yFiles for Java functionalities. Any redistribution
7    * of demo files in source code or binary form, with or without
8    * modification, is not permitted.
9    * 
10   * Owners of a valid software license for a yFiles for Java version that this
11   * demo is shipped with are allowed to use the demo source code as basis
12   * for their own yFiles for Java powered applications. Use of such programs is
13   * governed by the rights and conditions as set out in the yFiles for Java
14   * license agreement.
15   * 
16   * THIS SOFTWARE IS PROVIDED ''AS IS'' AND ANY EXPRESS OR IMPLIED
17   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18   * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
19   * NO EVENT SHALL yWorks BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
21   * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
22   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
23   * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
24   * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26   *
27   ***************************************************************************/
28  package demo.view.applet;
29  
30  import javax.swing.JApplet;
31  
32  import java.io.IOException;
33  import java.net.MalformedURLException;
34  import java.net.URL;
35  import java.net.URLConnection;
36  
37  /**
38   * This class represents a simple graph editor applet. The applet can be used inside a web browser with
39   * a Java 2 plugin (version >= 1.4) installed.
40   * <p>
41   * This applet supports the applet parameter "graphsource" which allows to specify the graph that is initially
42   * displayed by the applet. The graph needs to be in GraphML format. URLs are specified relative to
43   * the document base of the applet.
44   * </p>
45   * <p>
46   * To compile and deploy the applet it is best to use the Ant build script "build.xml" located in this directory.
47   * It compiles the application classes, jars them as "application.jar" in this directory and also copies "y.jar" into this directory.
48   * Once these Jar files are in place, the applet can be launched by opening the included HTML page
49   * "applet.html" with your browser.
50   * </p>
51   * <p>
52   * This applet demo has been successfully tested with Internet Explorer 9, 7 and 6, Firefox 7 and 3.5, Chrome 15 and 3,
53   * and Safari 5 and 4.
54   * </p>
55   */
56  public class AppletDemo extends JApplet {
57    
58    DemoEditor demoEditor;
59  
60    /**
61     * Mandatory default constructor for an applet.
62     */
63    public AppletDemo() {
64    }
65  
66    /**
67     * Applet initialization. Create the application GUI.
68     */
69    public void init() {
70      super.init();
71      demoEditor = new DemoEditor();
72      getRootPane().setContentPane(demoEditor);
73      getRootPane().setJMenuBar(demoEditor.createMenuBar());
74    }
75  
76    /**
77     * Start the applet. Try to load the graph given by applet parameter "graphsource".
78     */
79    public void start() {
80      super.start();
81  
82      String graphSource = getParameter("graphsource");
83  
84      if (graphSource != null) {
85        try {
86          URL graphURL = new URL(getDocumentBase(), graphSource);
87          try {
88            URLConnection urlConnection = graphURL.openConnection();
89            urlConnection.connect();
90          } catch (IOException ioex) {
91            //try classpath if resource node located at document base
92            graphURL = DemoEditor.getResource(getClass(), graphSource);
93          }
94          if (graphURL != null) {
95            demoEditor.loadAndDisplayGraph(graphURL);
96          }
97        } catch (MalformedURLException muex) {
98          muex.printStackTrace();
99        }
100     }
101   }
102 
103   /**
104    * Returns applet parameter information.
105    */
106   public String[][] getParameterInfo() {
107     return new String[][]{
108         // Parameter Name     Kind of Value   Description
109         {"graphsource", "URL", "an URL pointing to a diagram in GraphML format"}
110     };
111   }
112 }
113