|
1
19 package jcckit;
20
21 import jcckit.data.DataPlot;
22 import jcckit.util.AppletBasedConfigData;
23 import jcckit.util.ConfigParameters;
24 import jcckit.util.Factory;
25 import jcckit.util.PropertiesBasedConfigData;
26
27 import java.applet.Applet  ;
28 import java.awt.CardLayout ;
29 import java.awt.Component ;
30 import java.awt.Color ;
31 import java.awt.Label ;
32 import java.awt.TextArea ;
33 import java.io.InputStream ;
34 import java.net.URL ;
35 import java.util.Properties ;
36
37
76 public class PlotApplet extends Applet implements Runnable {
77 public static final String DEFAULT_WAITING_MESSAGE
78 = "Please wait, applet data are loading...";
79 public static final String WAITING_MESSAGE_KEY = "waitingMessage",
80 DATA_PROPERTIES_KEY = "dataProperties",
81 DATA_KEY = "data",
82 RENDERER_KEY = "renderer";
83 private CardLayout _layout = new CardLayout ();
84
85
86 public void init() {
87 setLayout(_layout);
88 String label = getParameter(WAITING_MESSAGE_KEY);
89 if (label == null) {
90 label = DEFAULT_WAITING_MESSAGE;
91 }
92 add(new Label (label, Label.CENTER), "");
93 }
94
95
96 public void start() {
97 new Thread (this).start();
98 }
99
100
104 public void run() {
105 try {
106 ConfigParameters config
107 = new ConfigParameters(new AppletBasedConfigData(this));
108 DataPlot dPlot = new DataPlot(getDataConfig(config));
109 GraphicsPlotCanvas canvas
110 = config.get(Factory.CLASS_NAME_KEY, null) == null ?
111 new GraphicsPlotCanvas(config)
112 : (GraphicsPlotCanvas) Factory.create(config);
113 canvas.setRenderer(config.get(RENDERER_KEY,
114 "jcckit.renderer.GraphicsRenderer"));
115 canvas.connect(dPlot);
116 show(canvas.getGraphicsCanvas());
117 } catch (Throwable t) {
118 show(t);
119 }
120 }
121
122 private void show(Throwable throwable) {
123 TextArea error = new TextArea (throwable.toString());
124 error.setForeground(Color.red);
125 show(error);
126 }
127
128 private void show(Component component) {
129 removeAll();
130 add(component, "");
131 _layout.last(this);
132 }
133
134
138 private ConfigParameters getDataConfig(ConfigParameters config)
139 throws Throwable {
140 ConfigParameters result = config.getNode(DATA_KEY);
141 String dataProperties = config.get(DATA_PROPERTIES_KEY, null);
142 if (dataProperties != null) {
143 Properties properties = new Properties ();
144 InputStream is
145 = new URL (getDocumentBase(), dataProperties).openStream();
146 properties.load(is);
147 is.close();
148 result = new ConfigParameters(new PropertiesBasedConfigData(properties));
149 }
150 return result;
151 }
152 }
153 |
Popular Tags |
Java API By Example, From Geeks To Geeks.