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1
8
9 package mx4j.tools.config;
10
11 import java.io.Reader  ;
12 import java.util.ArrayList ;
13 import java.util.List ;
14 import javax.management.MBeanRegistration ;
15 import javax.management.MBeanServer ;
16 import javax.management.ObjectName ;
17 import javax.xml.parsers.DocumentBuilder ;
18 import javax.xml.parsers.DocumentBuilderFactory ;
19
20 import org.w3c.dom.Document ;
21 import org.w3c.dom.Element ;
22 import org.w3c.dom.NamedNodeMap ;
23 import org.w3c.dom.Node ;
24 import org.w3c.dom.NodeList ;
25 import org.xml.sax.InputSource ;
26
27
30 public class ConfigurationLoader implements ConfigurationLoaderMBean, MBeanRegistration
31 {
32 private MBeanServer server;
33 private ConfigurationBuilder builder;
34 private ConfigurationBuilder.Node root;
35
36 public ConfigurationLoader()
37 {
38 this(null, new DefaultConfigurationBuilder());
39 }
40
41 public ConfigurationLoader(ConfigurationBuilder builder)
42 {
43 this(null, builder);
44 }
45
46 public ConfigurationLoader(MBeanServer server)
47 {
48 this(server, new DefaultConfigurationBuilder());
49 }
50
51 public ConfigurationLoader(MBeanServer server, ConfigurationBuilder builder)
52 {
53 this.server = server;
54 if (builder == null) throw new IllegalArgumentException ("ConfigurationBuilder cannot be null");
55 this.builder = builder;
56 }
57
58 public ObjectName preRegister(MBeanServer server, ObjectName name) throws Exception
59 {
60 this.server = server;
61 return name;
62 }
63
64 public void postRegister(Boolean registered)
65 {
66 }
67
68 public void preDeregister() throws Exception
69 {
70 }
71
72 public void postDeregister()
73 {
74 }
75
76 public void startup(Reader source) throws ConfigurationException
77 {
78 if (server == null) throw new ConfigurationException("Cannot startup the configuration, MBeanServer is not specified");
79
80 try
81 {
82 DocumentBuilderFactory documentFactory = DocumentBuilderFactory.newInstance();
83 DocumentBuilder documentBuilder = documentFactory.newDocumentBuilder();
84 InputSource src = new InputSource (source);
85 Document document = documentBuilder.parse(src);
86
87 Element xmlRoot = document.getDocumentElement();
88 root = builder.createConfigurationNode(xmlRoot);
89 parse(xmlRoot, root);
90 root.configure(server);
91 }
92 catch (ConfigurationException x)
93 {
94 throw x;
95 }
96 catch (Exception x)
97 {
98 throw new ConfigurationException(x);
99 }
100 }
101
102 public void shutdown() throws ConfigurationException
103 {
104 root.configure(null);
105 }
106
107 private void parse(Element xmlNode, ConfigurationBuilder.Node node) throws ConfigurationException
108 {
109 NamedNodeMap attributes = xmlNode.getAttributes();
110 if (attributes != null && attributes.getLength() > 0)
111 {
112 node.setAttributes(attributes);
113 }
114
115 List elements = getChildrenElements(xmlNode);
116 if (elements != null)
117 {
118 for (int i = 0; i < elements.size(); ++i)
119 {
120 Element xmlChild = (Element )elements.get(i);
121 ConfigurationBuilder.Node child = builder.createConfigurationNode(xmlChild);
122 node.addChild(child);
123 parse(xmlChild, child);
124 }
125 }
126
127 String value = getNodeValue(xmlNode);
128 node.setText(value);
129 }
130
131 private List getChildrenElements(Element xmlNode)
132 {
133 NodeList xmlChildren = xmlNode.getChildNodes();
134 if (xmlChildren == null) return null;
135
136 ArrayList children = new ArrayList ();
137 for (int i = 0; i < xmlChildren.getLength(); ++i)
138 {
139 Node xmlChild = xmlChildren.item(i);
140 if (xmlChild.getNodeType() == Node.ELEMENT_NODE) children.add(xmlChild);
141 }
142 return children;
143 }
144
145 private String getNodeValue(Element xmlNode)
146 {
147 NodeList xmlChildren = xmlNode.getChildNodes();
148 if (xmlChildren == null) return null;
149
150 for (int i = 0; i < xmlChildren.getLength(); ++i)
151 {
152 Node xmlChild = xmlChildren.item(i);
153 if (xmlChild.getNodeType() == Node.TEXT_NODE)
154 {
155 return xmlChild.getNodeValue();
156 }
157 }
158 return null;
159 }
160 }
161 |
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