Examples of javax.naming.NamingEnumeration

javax.naming.NamingEnumeration
This interface is for enumerating lists returned by methods in the javax.naming and javax.naming.directory packages. It extends Enumeration to allow as exceptions to be thrown during the enumeration.
When a method such as list(), listBindings(), or search() returns a NamingEnumeration, any exceptions encountered are reserved until all results have been returned. At the end of the enumeration, the exception is thrown (by hasMore());
For example, if the list() is returning only a partial answer, the corresponding exception would be PartialResultException. list() would first return a NamingEnumeration. When the last of the results has been returned by the NamingEnumeration's next(), invoking hasMore() would result in PartialResultException being thrown.
In another example, if a search() method was invoked with a specified size limit of 'n'. If the answer consists of more than 'n' results, search() would first return a NamingEnumeration. When the n'th result has been returned by invoking next() on the NamingEnumeration, a SizeLimitExceedException would then thrown when hasMore() is invoked.
Note that if the program uses hasMoreElements() and nextElement() instead to iterate through the NamingEnumeration, because these methods cannot throw exceptions, no exception will be thrown. Instead, in the previous example, after the n'th result has been returned by nextElement(), invoking hasMoreElements() would return false.
Note also that NoSuchElementException is thrown if the program invokes next() or nextElement() when there are no elements left in the enumeration. The program can always avoid this exception by using hasMore() and hasMoreElements() to check whether the end of the enumeration has been reached.
If an exception is thrown during an enumeration, the enumeration becomes invalid. Subsequent invocation of any method on that enumeration will yield undefined results. @author Rosanna Lee @author Scott Seligman @see Context#list @see Context#listBindings @see javax.naming.directory.DirContext#search @see javax.naming.directory.Attributes#getAll @see javax.naming.directory.Attributes#getIDs @see javax.naming.directory.Attribute#getAll @since 1.3

        // therefore is not valid
        if (dirContext == null) return false;
        // Find the Manifest for the Web Applicaiton
        InputStream inputStream = null;
        try {
            NamingEnumeration wne = dirContext.listBindings("/META-INF/");
            Binding binding = (Binding) wne.nextElement();
            if (binding.getName().toUpperCase().equals("MANIFEST.MF")) {
                Resource resource = (Resource)dirContext.lookup
                                    ("/META-INF/" + binding.getName());
                inputStream = resource.streamContent();
                Manifest manifest = new Manifest(inputStream);
                inputStream.close();
                inputStream = null;
                ManifestResource mre = new ManifestResource
                    (sm.getString("extensionValidator.web-application-manifest"),
                    manifest, ManifestResource.WAR);
                appManifestResources.add(mre);
            } 
        } catch (NamingException nex) {
            // Application does not contain a MANIFEST.MF file
        } catch (NoSuchElementException nse) {
            // Application does not contain a MANIFEST.MF file
        } finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (Throwable t) {
                    // Ignore
                }
            }
        }


        // Locate the Manifests for all bundled JARs
        NamingEnumeration ne = null;
        try {
            if (dirContext != null) {
                ne = dirContext.listBindings("WEB-INF/lib/");
            }
            while ((ne != null) && ne.hasMoreElements()) {
                Binding binding = (Binding)ne.nextElement();
                if (!binding.getName().toLowerCase().endsWith(".jar")) {
                    continue;
                }
                Object obj =
                    dirContext.lookup("/WEB-INF/lib/" + binding.getName());

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        // Check if JARs have been added or removed
        if (getJarPath() != null) {


            try {
                NamingEnumeration enumeration = resources.listBindings(getJarPath());
                int i = 0;
                while (enumeration.hasMoreElements() && (i < length)) {
                    NameClassPair ncPair = (NameClassPair) enumeration.nextElement();
                    String name = ncPair.getName();
                    // Ignore non JARs present in the lib folder
                    if (!name.endsWith(".jar"))
                        continue;
                    if (!name.equals(jarNames[i])) {
                        // Missing JAR
                        log.info("    Additional JARs have been added : '" 
                                 + name + "'");
                        return (true);
                    }
                    i++;
                }
                if (enumeration.hasMoreElements()) {
                    while (enumeration.hasMoreElements()) {
                        NameClassPair ncPair = 
                            (NameClassPair) enumeration.nextElement();
                        String name = ncPair.getName();
                        // Additional non-JAR files are allowed
                        if (name.endsWith(".jar")) {
                            // There was more JARs
                            log.info("    Additional JARs have been added");

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                }


                if ((object instanceof DirContext) && (depth > 0)) {


                    try {
                        NamingEnumeration enumeration = resources.list(currentPath);
                        while (enumeration.hasMoreElements()) {
                            NameClassPair ncPair =
                                (NameClassPair) enumeration.nextElement();
                            String newPath = currentPath;
                            if (!(newPath.endsWith("/")))
                                newPath += "/";
                            newPath += ncPair.getName();
                            stackBelow.push(newPath);

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                    (dest, new Integer(WebdavStatus.SC_CONFLICT));
                return false;
            }


            try {
                NamingEnumeration enumeration = resources.list(source);
                while (enumeration.hasMoreElements()) {
                    NameClassPair ncPair = (NameClassPair) enumeration.nextElement();
                    String childDest = dest;
                    if (!childDest.equals("/"))
                        childDest += "/";
                    childDest += ncPair.getName();
                    String childSrc = source;

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        sb.append("<entries>");


        try {


            // Render the directory entries within this directory
            NamingEnumeration enumeration = resources.list(cacheEntry.name);
            
            // rewriteUrl(contextPath) is expensive. cache result for later reuse
            String rewrittenContextPath =  rewriteUrl(contextPath);


            while (enumeration.hasMoreElements()) {


                NameClassPair ncPair = (NameClassPair) enumeration.nextElement();
                String resourceName = ncPair.getName();
                String trimmed = resourceName/*.substring(trim)*/;
                if (trimmed.equalsIgnoreCase("WEB-INF") ||
                    trimmed.equalsIgnoreCase("META-INF") ||
                    trimmed.equalsIgnoreCase(localXsltFile))

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        sb.append("</tr>");


        try {


            // Render the directory entries within this directory
            NamingEnumeration enumeration = resources.list(cacheEntry.name);
            boolean shade = false;
            while (enumeration.hasMoreElements()) {


                NameClassPair ncPair = (NameClassPair) enumeration.nextElement();
                String resourceName = ncPair.getName();
                String trimmed = resourceName/*.substring(trim)*/;
                if (trimmed.equalsIgnoreCase("WEB-INF") ||
                    trimmed.equalsIgnoreCase("META-INF"))
                    continue;

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        assertEquals(new CompositeName("org/research/user/jane"), envContext.composeName(new CompositeName("user/jane"), new CompositeName("org/research")));
        assertEquals(new CompositeName("research/user/jane"), envContext.composeName(new CompositeName("user/jane"), new CompositeName("research")));
    }


    public void testList() throws NamingException {
        NamingEnumeration ne;
        Map expected;
        Map result;


        expected = new HashMap();
        for (Iterator i = envBinding.entrySet().iterator(); i.hasNext();) {
            Map.Entry entry = (Map.Entry) i.next();
            expected.put(entry.getKey(), entry.getValue().getClass().getName());
        }
        ne = envContext.list("");
        result = new HashMap();
        while (ne.hasMore()) {
            NameClassPair pair = (NameClassPair) ne.next();
            result.put(pair.getName(), pair.getClassName());
        }
        assertEquals(expected, result);


        try {
            ne.next();
            fail();
        } catch (NoSuchElementException e) {
            // ok
        }
        try {
            ne.nextElement();
            fail();
        } catch (NoSuchElementException e) {
            // ok
        }
    }

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            // ok
        }
    }


    public void testListBindings() throws NamingException {
        NamingEnumeration ne;
        ne = envContext.listBindings("");
        int count = 0;
        while (ne.hasMore()) {
            count ++;
            Binding pair = (Binding) ne.next();
            assertTrue(envBinding.containsKey(pair.getName()));
            if (! (envBinding.get(pair.getName()) instanceof ReadOnlyContext)) {
                assertEquals(pair.getObject(), envBinding.get(pair.getName()));
            }
        }
        assertEquals(envBinding.size(), count);


        try {
            ne.next();
            fail();
        } catch (NoSuchElementException e) {
            // ok
        }
        try {
            ne.nextElement();
            fail();
        } catch (NoSuchElementException e) {
            // ok
        }
    }

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        if (log.isTraceEnabled()) {
            log.trace("  Scanning TLDs in " + rootPath + " subdirectory");
        }


        try {
            NamingEnumeration items = resources.list(rootPath);
            while (items.hasMoreElements()) {
                NameClassPair item = (NameClassPair) items.nextElement();
                String resourcePath = rootPath + "/" + item.getName();
                if (!resourcePath.endsWith(".tld")
                        && (resourcePath.startsWith("/WEB-INF/classes")
                            || resourcePath.startsWith("/WEB-INF/lib"))) {
                    continue;

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        // Check if JARs have been added or removed
        if (getJarPath() != null) {


            try {
                NamingEnumeration enumeration = resources.listBindings(getJarPath());
                int i = 0;
                while (enumeration.hasMoreElements() && (i < length)) {
                    NameClassPair ncPair = (NameClassPair) enumeration.nextElement();
                    String name = ncPair.getName();
                    // Ignore non JARs present in the lib folder
                    if (!name.endsWith(".jar"))
                        continue;
                    if (!name.equals(jarNames[i])) {
                        // Missing JAR
                        log.info("    Additional JARs have been added : '" 
                                 + name + "'");
                        return (true);
                    }
                    i++;
                }
                if (enumeration.hasMoreElements()) {
                    while (enumeration.hasMoreElements()) {
                        NameClassPair ncPair = 
                            (NameClassPair) enumeration.nextElement();
                        String name = ncPair.getName();
                        // Additional non-JAR files are allowed
                        if (name.endsWith(".jar")) {
                            // There was more JARs
                            log.info("    Additional JARs have been added");

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