1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.collections4.properties;
19
20 import java.io.File;
21 import java.io.FileInputStream;
22 import java.io.FileNotFoundException;
23 import java.io.IOException;
24 import java.io.InputStream;
25 import java.io.Reader;
26 import java.net.URI;
27 import java.net.URL;
28 import java.nio.file.Files;
29 import java.nio.file.Path;
30 import java.nio.file.Paths;
31 import java.util.Objects;
32 import java.util.Properties;
33
34 /**
35 * Subclasses create and load {@link Properties} and subclasses of {@link Properties} like {@link SortedProperties}.
36 *
37 * @param <T> {@link Properties} or a subclass like {@link SortedProperties}.
38 * @see Properties
39 * @since 4.4
40 */
41 public abstract class AbstractPropertiesFactory<T extends Properties> {
42
43 /**
44 * Enumerates property formats.
45 *
46 * @since 4.5
47 */
48 public enum PropertyFormat {
49
50 /** Properties file format. */
51 PROPERTIES,
52
53 /** XML file format. */
54 XML;
55
56 static PropertyFormat toPropertyFormat(final String fileName) {
57 return Objects.requireNonNull(fileName, "fileName").endsWith(".xml") ? XML : PROPERTIES;
58 }
59 }
60
61 /**
62 * Constructs an instance.
63 */
64 protected AbstractPropertiesFactory() {
65 // no init.
66 }
67
68 /**
69 * Subclasses override to provide customized properties instances.
70 *
71 * @return a new Properties instance.
72 */
73 protected abstract T createProperties();
74
75 /**
76 * Creates and loads properties from the given file.
77 *
78 * @param classLoader the class loader to use to get the named resource.
79 * @param name the location of the properties file.
80 * @return a new properties object.
81 * @throws IOException Thrown if an error occurred reading the input stream.
82 * @throws IllegalArgumentException Thrown if the input contains a malformed Unicode escape sequence.
83 */
84 public T load(final ClassLoader classLoader, final String name) throws IOException {
85 try (InputStream inputStream = classLoader.getResourceAsStream(name)) {
86 return load(inputStream, PropertyFormat.toPropertyFormat(name));
87 }
88 }
89
90 /**
91 * Creates and loads properties from the given file.
92 *
93 * @param file the location of the properties file.
94 * @return a new properties object.
95 * @throws IOException Thrown if an error occurred reading the input stream.
96 * @throws IllegalArgumentException Thrown if the input contains a malformed Unicode escape sequence.
97 * @throws FileNotFoundException Thrown if the file does not exist, is a directory, or cannot be opened for
98 * reading.
99 * @throws SecurityException Thrown if a security manager's {@code checkRead} method denies read access to
100 * the file.
101 */
102 public T load(final File file) throws FileNotFoundException, IOException {
103 try (FileInputStream inputStream = new FileInputStream(file)) {
104 return load(inputStream, PropertyFormat.toPropertyFormat(file.getName()));
105 }
106 }
107
108 /**
109 * Creates and loads properties from the given input stream.
110 *
111 * @param inputStream the location of the properties file.
112 * @return a new properties object.
113 * @throws IOException Thrown if an error occurred reading the input stream.
114 * @throws IllegalArgumentException Thrown if the input contains a malformed Unicode escape sequence.
115 */
116 public T load(final InputStream inputStream) throws IOException {
117 if (inputStream == null) {
118 return null;
119 }
120 final T properties = createProperties();
121 properties.load(inputStream);
122 return properties;
123 }
124
125 /**
126 * Creates and loads properties from the given input stream.
127 *
128 * @param inputStream the location of the properties file.
129 * @param propertyFormat The format of the given file.
130 * @return a new properties object.
131 * @throws IOException Thrown if an error occurred reading the input stream.
132 * @throws IllegalArgumentException Thrown if the input contains a malformed Unicode escape sequence.
133 * @since 4.5
134 */
135 public T load(final InputStream inputStream, final PropertyFormat propertyFormat) throws IOException {
136 if (inputStream == null) {
137 return null;
138 }
139 final T properties = createProperties();
140 if (propertyFormat == PropertyFormat.XML) {
141 properties.loadFromXML(inputStream);
142 } else {
143 properties.load(inputStream);
144 }
145 return properties;
146 }
147
148 /**
149 * Creates and loads properties from the given path.
150 *
151 * @param path the location of the properties file.
152 * @return a new properties object.
153 * @throws IOException Thrown if an error occurred reading the input stream.
154 * @throws IllegalArgumentException Thrown if the input contains a malformed Unicode escape sequence.
155 */
156 public T load(final Path path) throws IOException {
157 try (InputStream inputStream = Files.newInputStream(path)) {
158 return load(inputStream, PropertyFormat.toPropertyFormat(Objects.toString(path.getFileName(), null)));
159 }
160 }
161
162 /**
163 * Creates and loads properties from the given reader.
164 *
165 * @param reader the location of the properties file.
166 * @return a new properties object.
167 * @throws IOException Thrown if an error occurred reading the input stream.
168 * @throws IllegalArgumentException Thrown if the input contains a malformed Unicode escape sequence.
169 */
170 public T load(final Reader reader) throws IOException {
171 final T properties = createProperties();
172 properties.load(reader);
173 return properties;
174 }
175
176 /**
177 * Creates and loads properties from the given file name.
178 *
179 * @param name the location of the properties file.
180 * @return a new properties object.
181 * @throws IOException Thrown if an error occurred reading the input stream.
182 * @throws IllegalArgumentException Thrown if the input contains a malformed Unicode escape sequence.
183 */
184 public T load(final String name) throws IOException {
185 try (FileInputStream inputStream = new FileInputStream(name)) {
186 return load(inputStream, PropertyFormat.toPropertyFormat(name));
187 }
188 }
189
190 /**
191 * Creates and loads properties from the given URI.
192 *
193 * @param uri the location of the properties file.
194 * @return a new properties object.
195 * @throws IOException Thrown if an error occurred reading the input stream.
196 * @throws IllegalArgumentException Thrown if the input contains a malformed Unicode escape sequence.
197 */
198 public T load(final URI uri) throws IOException {
199 return load(Paths.get(uri));
200 }
201
202 /**
203 * Creates and loads properties from the given URL.
204 *
205 * @param url the location of the properties file.
206 * @return a new properties object.
207 * @throws IOException Thrown if an error occurred reading the input stream.
208 * @throws IllegalArgumentException Thrown if the input contains a malformed Unicode escape sequence.
209 */
210 public T load(final URL url) throws IOException {
211 try (InputStream inputStream = url.openStream()) {
212 return load(inputStream, PropertyFormat.toPropertyFormat(url.getFile()));
213 }
214 }
215
216 }