001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements. See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership. The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied. See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 *
019 */
020 package org.apache.directory.server.core.jndi;
021
022
023 import java.util.NoSuchElementException;
024
025 import javax.naming.NamingEnumeration;
026 import javax.naming.NamingException;
027 import javax.naming.directory.SearchResult;
028
029 import org.apache.directory.server.core.entry.ClonedServerEntry;
030 import org.apache.directory.server.core.entry.ServerEntryUtils;
031 import org.apache.directory.server.core.filtering.EntryFilteringCursor;
032 import org.apache.directory.shared.ldap.jndi.JndiUtils;
033
034
035 /**
036 * Adapts a Cursor over entries into a NamingEnumeration.
037 *
038 * @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
039 * @version $Rev$, $Date$
040 */
041 public class NamingEnumerationAdapter implements NamingEnumeration<SearchResult>
042 {
043 private final EntryFilteringCursor cursor;
044 private boolean available = false;
045
046
047 public NamingEnumerationAdapter( EntryFilteringCursor cursor ) throws NamingException
048 {
049 this.cursor = cursor;
050 try
051 {
052 if ( ! cursor.first() )
053 {
054 cursor.close();
055 available = false;
056 }
057 else
058 {
059 available = true;
060 }
061 }
062 catch ( Exception e )
063 {
064 JndiUtils.wrap( e );
065 }
066 }
067
068
069 /*
070 * @see NamingEnumeration#close()
071 */
072 public void close() throws NamingException
073 {
074 try
075 {
076 cursor.close();
077 available = false;
078 }
079 catch ( Exception e )
080 {
081 JndiUtils.wrap( e );
082 }
083 }
084
085
086 /*
087 * @see NamingEnumeration#hasMore()
088 */
089 public boolean hasMore() throws NamingException
090 {
091 return available;
092 }
093
094
095 /*
096 * @see NamingEnumeration#next()
097 */
098 public SearchResult next() throws NamingException
099 {
100 ClonedServerEntry entry = null;
101
102 try
103 {
104 entry = cursor.get();
105 if ( cursor.next() )
106 {
107 available = true;
108 }
109 else
110 {
111 available = false;
112 cursor.close();
113 }
114 }
115 catch ( Exception e )
116 {
117 JndiUtils.wrap( e );
118 }
119
120 SearchResult result = new SearchResult( entry.getDn().getName(), null,
121 ServerEntryUtils.toBasicAttributes( entry ) );
122 result.setRelative( false );
123 return result;
124 }
125
126
127 /*
128 * @see Enumeration#hasMoreElements()
129 */
130 public boolean hasMoreElements()
131 {
132 return available;
133 }
134
135
136 /*
137 * @see Enumeration#nextElement()
138 */
139 public SearchResult nextElement()
140 {
141 try
142 {
143 return next();
144 }
145 catch ( NamingException e )
146 {
147 throw new NoSuchElementException( e.getLocalizedMessage() );
148 }
149 }
150 }