1 /*
2 * Copyright (c) 1999, 2000, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 /**
27 * Given an enumeration of candidates, check whether each
28 * item in enumeration satifies the given filter.
29 * Each item is a Binding and the following is used to get its
30 * attributes for used by the filter:
31 *
32 * ((DirContext)item.getObject()).getAttributes("").
33 * If item.getObject() is not an DirContext, the item is skipped
34 *
35 * The items in the enumeration are obtained one at a time as
36 * items from the search enumeration are requested.
37 *
38 * @author Rosanna Lee
39 */
40
41 package com.sun.jndi.toolkit.dir;
42
43 import javax.naming.*;
44 import javax.naming.directory.*;
45 import javax.naming.spi.DirectoryManager;
46
47 import java.util.NoSuchElementException;
48 import java.util.Hashtable;
49
50 final public class LazySearchEnumerationImpl implements NamingEnumeration {
51 private NamingEnumeration candidates;
52 private SearchResult nextMatch = null;
53 private SearchControls cons;
54 private AttrFilter filter;
55 private Context context;
56 private Hashtable env;
57 private boolean useFactory = true;
58
59 public LazySearchEnumerationImpl(NamingEnumeration candidates,
60 AttrFilter filter, SearchControls cons) throws NamingException {
61 this.candidates = candidates;
62 this.filter = filter;
63
64 if(cons == null) {
65 this.cons = new SearchControls();
66 } else {
67 this.cons = cons;
68 }
69 }
70
71 public LazySearchEnumerationImpl(NamingEnumeration candidates,
72 AttrFilter filter, SearchControls cons,
73 Context ctx, Hashtable env, boolean useFactory) throws NamingException {
74
75 this.candidates = candidates;
76 this.filter = filter;
77 this.env = env;
78 this.context = ctx;
79 this.useFactory = useFactory;
80
81 if(cons == null) {
82 this.cons = new SearchControls();
83 } else {
84 this.cons = cons;
85 }
86 }
87
88
89 public LazySearchEnumerationImpl(NamingEnumeration candidates,
90 AttrFilter filter, SearchControls cons,
91 Context ctx, Hashtable env) throws NamingException {
92 this(candidates, filter, cons, ctx, env, true);
93 }
94
95 public boolean hasMore() throws NamingException {
96 // find and do not remove from list
97 return findNextMatch(false) != null;
98 }
99
100 public boolean hasMoreElements() {
101 try {
102 return hasMore();
103 } catch (NamingException e) {
104 return false;
105 }
106 }
107
108 public Object nextElement() {
109 try {
110 return findNextMatch(true);
111 } catch (NamingException e) {
112 throw new NoSuchElementException(e.toString());
113 }
114 }
115
116 public Object next() throws NamingException {
117 // find and remove from list
118 return (findNextMatch(true));
119 }
120
121 public void close() throws NamingException {
122 if (candidates != null) {
123 candidates.close();
124 }
125 }
126
127 private SearchResult findNextMatch(boolean remove) throws NamingException {
128 SearchResult answer;
129 if (nextMatch != null) {
130 answer = nextMatch;
131 if (remove) {
132 nextMatch = null;
133 }
134 return answer;
135 } else {
136 // need to find next match
137 Binding next;
138 Object obj;
139 Attributes targetAttrs;
140 while (candidates.hasMore()) {
141 next = (Binding)candidates.next();
142 obj = next.getObject();
143 if (obj instanceof DirContext) {
144 targetAttrs = ((DirContext)(obj)).getAttributes("");
145 if (filter.check(targetAttrs)) {
146 if (!cons.getReturningObjFlag()) {
147 obj = null;
148 } else if (useFactory) {
149 try {
150 // Give name only if context non-null,
151 // otherewise, name will be interpreted relative
152 // to initial context (not what we want)
153 Name nm = (context != null ?
154 new CompositeName(next.getName()) : null);
155 obj = DirectoryManager.getObjectInstance(obj,
156 nm, context, env, targetAttrs);
157 } catch (NamingException e) {
158 throw e;
159 } catch (Exception e) {
160 NamingException e2 = new NamingException(
161 "problem generating object using object factory");
162 e2.setRootCause(e);
163 throw e2;
164 }
165 }
166 answer = new SearchResult(next.getName(),
167 next.getClassName(), obj,
168 SearchFilter.selectAttributes(targetAttrs,
169 cons.getReturningAttributes()),
170 true);
171 if (!remove)
172 nextMatch = answer;
173 return answer;
174 }
175 }
176 }
177 return null;
178 }
179 }
180 }