78 }
79 /*
80 * No need to clone env here. If getObjectInstance()
81 * returns something other than a RegistryContext (which
82 * happens if you're looking up an object bound in the
83 * registry, as opposed to looking up the registry itself),
84 * then the context is GCed right away and there's no need to
85 * clone the environment. If getObjectInstance() returns a
86 * RegistryContext, then it still goes through
87 * GenericURLContext, which calls RegistryContext.lookup()
88 * with an empty name, which clones the environment.
89 */
90 Object obj = URLsToObject(getURLs((Reference)ref), env);
91 if (obj instanceof RegistryContext) {
92 RegistryContext ctx = (RegistryContext)obj;
93 ctx.reference = (Reference)ref;
94 }
95 return obj;
96 }
97
98 private static Context URLToContext(String url, Hashtable env)
99 throws NamingException
100 {
101 rmiURLContextFactory factory = new rmiURLContextFactory();
102 Object obj = factory.getObjectInstance(url, null, null, env);
103
104 if (obj instanceof Context) {
105 return (Context)obj;
106 } else {
107 throw (new NotContextException(url));
108 }
109 }
110
111 private static Object URLsToObject(String[] urls, Hashtable env)
112 throws NamingException
113 {
114 rmiURLContextFactory factory = new rmiURLContextFactory();
115 return factory.getObjectInstance(urls, null, null, env);
116 }
117
118 /**
119 * Reads environment to find URL of initial context.
120 * The default URL is "rmi:".
121 */
122 private static String getInitCtxURL(Hashtable env) {
123
124 final String defaultURL = "rmi:";
125
126 String url = null;
127 if (env != null) {
128 url = (String)env.get(Context.PROVIDER_URL);
129 }
130 return ((url != null) ? url : defaultURL);
131 }
132
133 /**
134 * Returns true if argument is an RMI registry reference.
135 */
136 private static boolean isRegistryRef(Object obj) {
137
138 if (!(obj instanceof Reference)) {
139 return false;
140 }
141 String thisClassName = RegistryContextFactory.class.getName();
142 Reference ref = (Reference)obj;
143
144 return thisClassName.equals(ref.getFactoryClassName());
145 }
146
147 /**
148 * Returns the URLs contained within an RMI registry reference.
149 */
150 private static String[] getURLs(Reference ref) throws NamingException {
151
152 int size = 0; // number of URLs
153 String[] urls = new String[ref.size()];
154
155 Enumeration addrs = ref.getAll();
156 while (addrs.hasMoreElements()) {
157 RefAddr addr = (RefAddr)addrs.nextElement();
158
159 if ((addr instanceof StringRefAddr) &&
160 addr.getType().equals(ADDRESS_TYPE)) {
161
162 urls[size++] = (String)addr.getContent();
163 }
164 }
165 if (size == 0) {
166 throw (new ConfigurationException(
167 "Reference contains no valid addresses"));
168 }
169
170 // Trim URL array down to size.
171 if (size == ref.size()) {
172 return urls;
173 }
174 String[] urls2 = new String[size];
175 System.arraycopy(urls, 0, urls2, 0, size);
176 return urls2;
177 }
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78 }
79 /*
80 * No need to clone env here. If getObjectInstance()
81 * returns something other than a RegistryContext (which
82 * happens if you're looking up an object bound in the
83 * registry, as opposed to looking up the registry itself),
84 * then the context is GCed right away and there's no need to
85 * clone the environment. If getObjectInstance() returns a
86 * RegistryContext, then it still goes through
87 * GenericURLContext, which calls RegistryContext.lookup()
88 * with an empty name, which clones the environment.
89 */
90 Object obj = URLsToObject(getURLs((Reference)ref), env);
91 if (obj instanceof RegistryContext) {
92 RegistryContext ctx = (RegistryContext)obj;
93 ctx.reference = (Reference)ref;
94 }
95 return obj;
96 }
97
98 private static Context URLToContext(String url, Hashtable<?,?> env)
99 throws NamingException
100 {
101 rmiURLContextFactory factory = new rmiURLContextFactory();
102 Object obj = factory.getObjectInstance(url, null, null, env);
103
104 if (obj instanceof Context) {
105 return (Context)obj;
106 } else {
107 throw (new NotContextException(url));
108 }
109 }
110
111 private static Object URLsToObject(String[] urls, Hashtable<?,?> env)
112 throws NamingException
113 {
114 rmiURLContextFactory factory = new rmiURLContextFactory();
115 return factory.getObjectInstance(urls, null, null, env);
116 }
117
118 /**
119 * Reads environment to find URL of initial context.
120 * The default URL is "rmi:".
121 */
122 private static String getInitCtxURL(Hashtable<?,?> env) {
123
124 final String defaultURL = "rmi:";
125
126 String url = null;
127 if (env != null) {
128 url = (String)env.get(Context.PROVIDER_URL);
129 }
130 return ((url != null) ? url : defaultURL);
131 }
132
133 /**
134 * Returns true if argument is an RMI registry reference.
135 */
136 private static boolean isRegistryRef(Object obj) {
137
138 if (!(obj instanceof Reference)) {
139 return false;
140 }
141 String thisClassName = RegistryContextFactory.class.getName();
142 Reference ref = (Reference)obj;
143
144 return thisClassName.equals(ref.getFactoryClassName());
145 }
146
147 /**
148 * Returns the URLs contained within an RMI registry reference.
149 */
150 private static String[] getURLs(Reference ref) throws NamingException {
151
152 int size = 0; // number of URLs
153 String[] urls = new String[ref.size()];
154
155 Enumeration<RefAddr> addrs = ref.getAll();
156 while (addrs.hasMoreElements()) {
157 RefAddr addr = addrs.nextElement();
158
159 if ((addr instanceof StringRefAddr) &&
160 addr.getType().equals(ADDRESS_TYPE)) {
161
162 urls[size++] = (String)addr.getContent();
163 }
164 }
165 if (size == 0) {
166 throw (new ConfigurationException(
167 "Reference contains no valid addresses"));
168 }
169
170 // Trim URL array down to size.
171 if (size == ref.size()) {
172 return urls;
173 }
174 String[] urls2 = new String[size];
175 System.arraycopy(urls, 0, urls2, 0, size);
176 return urls2;
177 }
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