45
46 public class dnsURLContextFactory implements ObjectFactory {
47
48 public Object getObjectInstance(Object urlInfo, Name name,
49 Context nameCtx, Hashtable<?,?> env)
50 throws NamingException {
51
52 if (urlInfo == null) {
53 return (new dnsURLContext(env));
54 } else if (urlInfo instanceof String) {
55 return getUsingURL((String) urlInfo, env);
56 } else if (urlInfo instanceof String[]) {
57 return getUsingURLs((String[]) urlInfo, env);
58 } else {
59 throw (new ConfigurationException(
60 "dnsURLContextFactory.getObjectInstance: " +
61 "argument must be a DNS URL String or an array of them"));
62 }
63 }
64
65 private static Object getUsingURL(String url, Hashtable env)
66 throws NamingException {
67
68 dnsURLContext urlCtx = new dnsURLContext(env);
69 try {
70 return urlCtx.lookup(url);
71 } finally {
72 urlCtx.close();
73 }
74 }
75
76 /*
77 * Try each URL until lookup() succeeds for one of them.
78 * If all URLs fail, throw one of the exceptions arbitrarily.
79 * Not pretty, but potentially more informative than returning null.
80 */
81 private static Object getUsingURLs(String[] urls, Hashtable env)
82 throws NamingException {
83
84 if (urls.length == 0) {
85 throw (new ConfigurationException(
86 "dnsURLContextFactory: empty URL array"));
87 }
88 dnsURLContext urlCtx = new dnsURLContext(env);
89 try {
90 NamingException ne = null;
91 for (int i = 0; i < urls.length; i++) {
92 try {
93 return urlCtx.lookup(urls[i]);
94 } catch (NamingException e) {
95 ne = e;
96 }
97 }
98 throw ne; // failure: throw one of the exceptions caught
99 } finally {
100 urlCtx.close();
101 }
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45
46 public class dnsURLContextFactory implements ObjectFactory {
47
48 public Object getObjectInstance(Object urlInfo, Name name,
49 Context nameCtx, Hashtable<?,?> env)
50 throws NamingException {
51
52 if (urlInfo == null) {
53 return (new dnsURLContext(env));
54 } else if (urlInfo instanceof String) {
55 return getUsingURL((String) urlInfo, env);
56 } else if (urlInfo instanceof String[]) {
57 return getUsingURLs((String[]) urlInfo, env);
58 } else {
59 throw (new ConfigurationException(
60 "dnsURLContextFactory.getObjectInstance: " +
61 "argument must be a DNS URL String or an array of them"));
62 }
63 }
64
65 private static Object getUsingURL(String url, Hashtable<?,?> env)
66 throws NamingException {
67
68 dnsURLContext urlCtx = new dnsURLContext(env);
69 try {
70 return urlCtx.lookup(url);
71 } finally {
72 urlCtx.close();
73 }
74 }
75
76 /*
77 * Try each URL until lookup() succeeds for one of them.
78 * If all URLs fail, throw one of the exceptions arbitrarily.
79 * Not pretty, but potentially more informative than returning null.
80 */
81 private static Object getUsingURLs(String[] urls, Hashtable<?,?> env)
82 throws NamingException {
83
84 if (urls.length == 0) {
85 throw (new ConfigurationException(
86 "dnsURLContextFactory: empty URL array"));
87 }
88 dnsURLContext urlCtx = new dnsURLContext(env);
89 try {
90 NamingException ne = null;
91 for (int i = 0; i < urls.length; i++) {
92 try {
93 return urlCtx.lookup(urls[i]);
94 } catch (NamingException e) {
95 ne = e;
96 }
97 }
98 throw ne; // failure: throw one of the exceptions caught
99 } finally {
100 urlCtx.close();
101 }
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