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Java > Open Source Codes > org > jgroups > util > PrintXMLTree


1 // $Id: PrintXMLTree.java,v 1.1.1.1 2003/09/09 01:24:12 belaban Exp $
2
3 package org.jgroups.util;
4
5
6 /**
7  * Title: JGroups Communications
8  * Description: Contact me at <a HREF="mailto:filip@filip.net">filip@filip.net</a>
9  * Copyright: Copyright (c) 2002
10  * Company: www.filip.net
11  * @author Filip Hanik
12  * @version 1.0
13  */
14 //Finally, import the W3C definition for a DOM and DOM exceptions:
15
16 import org.w3c.dom.*;
17
18 import java.io.PrintWriter JavaDoc;
19
20
21
22
23 public class PrintXMLTree {
24
25     public PrintXMLTree() {
26     }
27
28
29     public static void print(PrintWriter JavaDoc out,
30                              Element root) {
31
32         print("", out, root);
33     }
34
35     protected static void print(String JavaDoc prepend,
36                                 PrintWriter JavaDoc out,
37                                 Element root) {
38
39         // get elements that match
40 String JavaDoc attributeName=null;
41         if(root == null) return;
42
43         print(prepend, out, root, root.getAttributes());
44
45         NodeList elements=root.getChildNodes();
46
47         // is there anything to do?
48 if(elements == null) return;
49
50         // print all elements
51 if(attributeName == null) {
52             int elementCount=elements.getLength();
53             for(int i=0; i < elementCount; i++) {
54                 if(elements.item(i).getNodeType() == Node.ELEMENT_NODE) {
55                     Element element=(Element)elements.item(i);
56                     print(prepend, out, element, element.getAttributes());
57                 }
58             }
59         }
60
61         // print elements with given attribute name
62 else {
63             int elementCount=elements.getLength();
64             for(int i=0; i < elementCount; i++) {
65                 Element element=(Element)elements.item(i);
66                 NamedNodeMap attributes=element.getAttributes();
67                 if(attributes.getNamedItem(attributeName) != null) {
68                     print(prepend, out, element, attributes);
69                 }
70             }
71         }
72
73     } // print(PrintWriter,Document,String,String)
74
75
76     /** Prints the specified element. */
77     protected static void print(String JavaDoc prepend,
78                                 PrintWriter JavaDoc out,
79                                 Element element,
80                                 NamedNodeMap attributes) {
81
82         out.print(prepend);
83         out.print('<');
84         out.print(element.getNodeName());
85
86         if(attributes != null) {
87             int attributeCount=attributes.getLength();
88             for(int i=0; i < attributeCount; i++) {
89                 Attr attribute=(Attr)attributes.item(i);
90                 out.print(' ');
91                 out.print(attribute.getNodeName());
92                 out.print("=\"");
93                 out.print(normalize(attribute.getNodeValue()));
94                 out.print('"');
95             }
96         }
97         out.println('>');
98
99
100         NodeList list=element.getChildNodes();
101
102         for(int i=0; i < list.getLength(); i++) {
103             if(list.item(i).getNodeType() == Node.ELEMENT_NODE)
104                 print(prepend + " ", out, (Element)list.item(i));
105             else
106                 if(list.item(i).getNodeType() == Node.TEXT_NODE &&
107                         list.item(i).getNodeValue().trim().length() > 0)
108                     out.println(prepend + " " + list.item(i).getNodeValue());
109         }
110
111         out.print(prepend + "</");
112         out.print(element.getNodeName());
113         out.println(">");
114
115         out.flush();
116
117     } // print(PrintWriter,Element,NamedNodeMap)
118
119     public static String JavaDoc normalize(String JavaDoc s) {
120         StringBuffer JavaDoc str=new StringBuffer JavaDoc();
121
122         int len=(s != null)? s.length() : 0;
123         for(int i=0; i < len; i++) {
124             char ch=s.charAt(i);
125             switch(ch) {
126                 case '<':
127                     {
128                         str.append("&lt;");
129                         break;
130                     }
131                 case '>':
132                     {
133                         str.append("&gt;");
134                         break;
135                     }
136                 case '&':
137                     {
138                         str.append("&amp;");
139                         break;
140                     }
141                 case '"':
142                     {
143                         str.append("&quot;");
144                         break;
145                     }
146                 case '\r':
147                 case '\n':
148                     {
149                         str.append("&#");
150                         str.append(Integer.toString(ch));
151                         str.append(';');
152                         break;
153                     }
154                 default:
155                     {
156                         str.append(ch);
157                     }
158             }
159         }
160
161         return str.toString();
162
163     } // normalize(String):String
164 }
165
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