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1 package com.icesoft.faces.webapp.command;
2
3 import com.icesoft.faces.util.DOMUtils;
4 import org.w3c.dom.Element  ;
5
6 import java.io.IOException ;
7 import java.io.StringWriter ;
8 import java.io.Writer ;
9 import java.util.Arrays ;
10 import java.util.HashSet ;
11 import java.util.Set ;
12 import java.util.regex.Pattern ;
13
14 public class UpdateElements implements Command {
15 private final static Pattern START_CDATA = Pattern.compile("<\\!\\[CDATA\\[");
16 private final static Pattern END_CDATA = Pattern.compile("\\]\\]>");
17 private Element [] updates;
18
19 public UpdateElements(Element [] updates) {
20 this.updates = updates;
21 }
22
23 public Command coalesceWith(UpdateElements updateElementsCommand) {
24 Set coallescedUpdates = new HashSet ();
25 Element [] previousUpdates = updateElementsCommand.updates;
26
27 for (int i = 0; i < previousUpdates.length; i++) {
28 Element previousUpdate = previousUpdates[i];
29 Element selectedUpdate = previousUpdate;
30 for (int j = 0; j < updates.length; j++) {
31 Element update = updates[j];
32 if (update.getAttribute("id").equals(previousUpdate.getAttribute("id"))) {
33 selectedUpdate = update;
34 break;
35 }
36 }
37 coallescedUpdates.add(selectedUpdate);
38 }
39 coallescedUpdates.addAll(Arrays.asList(updates));
40
41 return new UpdateElements((Element []) coallescedUpdates.toArray(new Element [coallescedUpdates.size()]));
42 }
43
44 public Command coalesceWith(Command command) {
45 return command.coalesceWith(this);
46 }
47
48 public Command coalesceWith(Macro macro) {
49 return new Macro(macro, this);
50 }
51
52 public Command coalesceWith(Redirect redirect) {
53 return new Macro(redirect, this);
54 }
55
56 public Command coalesceWith(SessionExpired sessionExpired) {
57 return sessionExpired;
58 }
59
60 public Command coalesceWith(SetCookie setCookie) {
61 return new Macro(setCookie, this);
62 }
63
64 public Command coalesceWith(Pong pong) {
65 return new Macro(pong, this);
66 }
67
68 public Command coalesceWith(NOOP noop) {
69 return this;
70 }
71
72 public void serializeTo(Writer writer) throws IOException {
73 writer.write("<updates>");
74 for (int i = 0; i < updates.length; i++) {
75 Element update = updates[i];
76 if (update == null) continue;
77 writer.write("<update address=\"");
78 writer.write(update.getAttribute("id"));
79 writer.write("\"><![CDATA[");
80 String content = DOMUtils.nodeToString(update);
81 content = START_CDATA.matcher(content).replaceAll("<!#cdata#");
82 content = END_CDATA.matcher(content).replaceAll("##>");
83 writer.write(content);
84 writer.write("]]></update>");
85 }
86 writer.write("</updates>");
87 }
88
89 public String toString() {
90 try {
91 StringWriter writer = new StringWriter ();
92 serializeTo(writer);
93 return writer.toString();
94 } catch (IOException e) {
95 throw new RuntimeException (e);
96 }
97 }
98 }
99 |
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