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1
16
17
18 package org.apache.naming.config;
19
20 import java.io.IOException  ;
21 import java.io.InputStream ;
22 import java.util.Iterator ;
23 import java.util.Set ;
24
25 import javax.naming.Context ;
26 import javax.naming.InitialContext ;
27 import javax.naming.Name ;
28 import javax.naming.NameClassPair ;
29 import javax.naming.NamingEnumeration ;
30 import javax.naming.NamingException ;
31
32 import org.apache.commons.digester.Digester;
33 import org.apache.commons.logging.Log;
34 import org.apache.commons.logging.LogFactory;
35
36 import org.xml.sax.SAXException ;
37
38
44 public class XmlConfigurator
45 {
46 private static final String COMP_CONTEXT_NAME = "java:comp";
47 private static final String ENV_CONTEXT_NAME = "env";
48 private static final String ROOT_ELEMENT = "naming";
49 private static final String CONTEXT_ELEMENT = ROOT_ELEMENT + "/context";
50 private static final String ENV_ELEMENT = CONTEXT_ELEMENT + "/environment";
51 private static final String RES_ELEMENT = CONTEXT_ELEMENT + "/resource";
52 private static final String RES_PARAM_ELEMENT = RES_ELEMENT + "/parameter";
53 private static Context envContext = null;
54
55 private static final Log LOG = LogFactory.getLog(XmlConfigurator.class);
56
57
65 public static synchronized void setupInitialContext() throws NamingException {
66 System.setProperty(Context.INITIAL_CONTEXT_FACTORY, "org.apache.naming.java.javaURLContextFactory");
67 System.setProperty(Context.URL_PKG_PREFIXES, "org.apache.naming");
68
69 Context initialContext = new InitialContext ();
70 envContext = initialContext.createSubcontext(COMP_CONTEXT_NAME).createSubcontext(ENV_CONTEXT_NAME);
71 }
72
73
81 public static synchronized void destroyInitialContext() throws NamingException {
82 Context initialContext = new InitialContext ();
83 NamingEnumeration contexts = initialContext.list("");
84 while (contexts.hasMore()) {
85 initialContext.destroySubcontext(((NameClassPair ) contexts.next()).getName());
86 }
87 envContext = null;
88 initialContext = null;
89 }
90
91
98 public static synchronized void loadConfiguration(InputStream inputFile) throws NamingException , ParseException {
99 if (envContext == null)
100 {
101 setupInitialContext();
102 }
103
104 Digester digester = new Digester();
105 digester.addObjectCreate(ROOT_ELEMENT, Config.Naming.class);
107 digester.addObjectCreate(CONTEXT_ELEMENT, Config.Context.class);
108 digester.addSetProperties(CONTEXT_ELEMENT);
109 digester.addSetNext(CONTEXT_ELEMENT, "addContext");
110 digester.addObjectCreate(ENV_ELEMENT, Config.Environment.class);
112 digester.addSetProperties(ENV_ELEMENT);
113 digester.addSetNext(ENV_ELEMENT, "addEnvironment");
114 digester.addObjectCreate(RES_ELEMENT, Config.Resource.class);
115 digester.addSetProperties(RES_ELEMENT);
116 digester.addSetNext(RES_ELEMENT, "addResource");
117 digester.addCallMethod(RES_PARAM_ELEMENT + "", "addParameter", 2);
118 digester.addCallParam(RES_PARAM_ELEMENT + "/name", 0);
119 digester.addCallParam(RES_PARAM_ELEMENT + "/value", 1);
120
121 try
122 {
123 Config.Naming naming = (Config.Naming) digester.parse(inputFile);
124 if (naming == null) {
125 throw new ParseException("Unable to find root element '" + ROOT_ELEMENT + "'");
126 }
127 if (LOG.isDebugEnabled()) {
128 LOG.debug("XML configuration loaded: " + naming.toString());
129 }
130
131
132 for (Iterator i = naming.getContextList().iterator(); i.hasNext();)
133 {
134 Config.Context ctx = (Config.Context) i.next();
135 Context jndiCtx = envContext;
136 if (ctx.getName() != null)
137 {
138 destroyInitialContext();
139 Context initialContext = new InitialContext ();
140 Name nm = initialContext.getNameParser("").parse(ctx.getName());
141 envContext = initialContext.createSubcontext(nm.get(0));
142 jndiCtx = envContext;
143 for (int k = 1; k < nm.size(); k++) {
144 jndiCtx = jndiCtx.createSubcontext(nm.get(k));
145 }
146 }
147 precreateSubcontextTree(jndiCtx, naming.generateSortedSubcontextNameSet());
148
149 for (Iterator j = ctx.getEnvironmentList().iterator(); j.hasNext();)
150 {
151 Config.Environment e = (Config.Environment) j.next();
152 jndiCtx.rebind(e.getName(), e.createValue());
153 }
154
155 for (Iterator j = ctx.getResourceList().iterator(); j.hasNext();)
156 {
157 Config.Resource r = (Config.Resource) j.next();
158 jndiCtx.bind(r.getName(), r.createValue());
159 }
160 }
161 }
162 catch (IOException e)
163 {
164 throw new ParseException("Error reading configuration file", e);
165 }
166 catch (SAXException e)
167 {
168 throw new ParseException("Error reading configuration file", e);
169 }
170 }
171
172 private static void precreateSubcontextTree(Context ctx, Set sortedSubcontextNameSet) throws NamingException
173 {
174 for (Iterator i = sortedSubcontextNameSet.iterator(); i.hasNext();)
176 {
177 String name = (String ) i.next();
178 ctx.createSubcontext(name);
179 }
180 }
181
182 }
183 |
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