1 /*
2 * ====================================================================
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing,
14 * software distributed under the License is distributed on an
15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16 * KIND, either express or implied. See the License for the
17 * specific language governing permissions and limitations
18 * under the License.
19 * ====================================================================
20 *
21 * This software consists of voluntary contributions made by many
22 * individuals on behalf of the Apache Software Foundation. For more
23 * information on the Apache Software Foundation, please see
24 * <http://www.apache.org/>.
25 *
26 */
27
28 package org.apache.http.impl.client;
29
30 import java.net.URI;
31 import java.util.ArrayList;
32 import java.util.HashSet;
33 import java.util.Iterator;
34 import java.util.List;
35 import java.util.Set;
36
37 import org.apache.http.annotation.NotThreadSafe;
38
39 /**
40 * This class represents a collection of {@link URI}s used as redirect locations.
41 *
42 * @since 4.0
43 */
44 @NotThreadSafe // HashSet is not synch.
45 public class RedirectLocations {
46
47 private final Set<URI> unique;
48 private final List<URI> all;
49
50 public RedirectLocations() {
51 super();
52 this.unique = new HashSet<URI>();
53 this.all = new ArrayList<URI>();
54 }
55
56 /**
57 * Test if the URI is present in the collection.
58 */
59 public boolean contains(final URI uri) {
60 return this.unique.contains(uri);
61 }
62
63 /**
64 * Adds a new URI to the collection.
65 */
66 public void add(final URI uri) {
67 this.unique.add(uri);
68 this.all.add(uri);
69 }
70
71 /**
72 * Removes a URI from the collection.
73 */
74 public boolean remove(final URI uri) {
75 final boolean removed = this.unique.remove(uri);
76 if (removed) {
77 final Iterator<URI> it = this.all.iterator();
78 while (it.hasNext()) {
79 final URI current = it.next();
80 if (current.equals(uri)) {
81 it.remove();
82 }
83 }
84 }
85 return removed;
86 }
87
88 /**
89 * Returns all redirect {@link URI}s in the order they were added to the collection.
90 *
91 * @return list of all URIs
92 *
93 * @since 4.1
94 */
95 public List<URI> getAll() {
96 return new ArrayList<URI>(this.all);
97 }
98
99 }