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comparison: mobile/android/thirdparty/ch/boye/httpclientandroidlib/util/EntityUtils.java

mobile/android/thirdparty/ch/boye/httpclientandroidlib/util/EntityUtils.java

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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 ch.boye.httpclientandroidlib.util;
29
30 import java.io.IOException;
31 import java.io.InputStream;
32 import java.io.InputStreamReader;
33 import java.io.Reader;
34
35 import ch.boye.httpclientandroidlib.HeaderElement;
36 import ch.boye.httpclientandroidlib.HttpEntity;
37 import ch.boye.httpclientandroidlib.NameValuePair;
38 import ch.boye.httpclientandroidlib.ParseException;
39 import ch.boye.httpclientandroidlib.protocol.HTTP;
40
41 /**
42 * Static helpers for dealing with {@link HttpEntity}s.
43 *
44 * @since 4.0
45 */
46 public final class EntityUtils {
47
48 private EntityUtils() {
49 }
50
51 /**
52 * Ensures that the entity content is fully consumed and the content stream, if exists,
53 * is closed.
54 *
55 * @param entity
56 * @throws IOException if an error occurs reading the input stream
57 *
58 * @since 4.1
59 */
60 public static void consume(final HttpEntity entity) throws IOException {
61 if (entity == null) {
62 return;
63 }
64 if (entity.isStreaming()) {
65 InputStream instream = entity.getContent();
66 if (instream != null) {
67 instream.close();
68 }
69 }
70 }
71
72 /**
73 * Read the contents of an entity and return it as a byte array.
74 *
75 * @param entity
76 * @return byte array containing the entity content. May be null if
77 * {@link HttpEntity#getContent()} is null.
78 * @throws IOException if an error occurs reading the input stream
79 * @throws IllegalArgumentException if entity is null or if content length > Integer.MAX_VALUE
80 */
81 public static byte[] toByteArray(final HttpEntity entity) throws IOException {
82 if (entity == null) {
83 throw new IllegalArgumentException("HTTP entity may not be null");
84 }
85 InputStream instream = entity.getContent();
86 if (instream == null) {
87 return null;
88 }
89 try {
90 if (entity.getContentLength() > Integer.MAX_VALUE) {
91 throw new IllegalArgumentException("HTTP entity too large to be buffered in memory");
92 }
93 int i = (int)entity.getContentLength();
94 if (i < 0) {
95 i = 4096;
96 }
97 ByteArrayBuffer buffer = new ByteArrayBuffer(i);
98 byte[] tmp = new byte[4096];
99 int l;
100 while((l = instream.read(tmp)) != -1) {
101 buffer.append(tmp, 0, l);
102 }
103 return buffer.toByteArray();
104 } finally {
105 instream.close();
106 }
107 }
108
109 /**
110 * Obtains character set of the entity, if known.
111 *
112 * @param entity must not be null
113 * @return the character set, or null if not found
114 * @throws ParseException if header elements cannot be parsed
115 * @throws IllegalArgumentException if entity is null
116 */
117 public static String getContentCharSet(final HttpEntity entity) throws ParseException {
118 if (entity == null) {
119 throw new IllegalArgumentException("HTTP entity may not be null");
120 }
121 String charset = null;
122 if (entity.getContentType() != null) {
123 HeaderElement values[] = entity.getContentType().getElements();
124 if (values.length > 0) {
125 NameValuePair param = values[0].getParameterByName("charset");
126 if (param != null) {
127 charset = param.getValue();
128 }
129 }
130 }
131 return charset;
132 }
133
134 /**
135 * Obtains mime type of the entity, if known.
136 *
137 * @param entity must not be null
138 * @return the character set, or null if not found
139 * @throws ParseException if header elements cannot be parsed
140 * @throws IllegalArgumentException if entity is null
141 *
142 * @since 4.1
143 */
144 public static String getContentMimeType(final HttpEntity entity) throws ParseException {
145 if (entity == null) {
146 throw new IllegalArgumentException("HTTP entity may not be null");
147 }
148 String mimeType = null;
149 if (entity.getContentType() != null) {
150 HeaderElement values[] = entity.getContentType().getElements();
151 if (values.length > 0) {
152 mimeType = values[0].getName();
153 }
154 }
155 return mimeType;
156 }
157
158 /**
159 * Get the entity content as a String, using the provided default character set
160 * if none is found in the entity.
161 * If defaultCharset is null, the default "ISO-8859-1" is used.
162 *
163 * @param entity must not be null
164 * @param defaultCharset character set to be applied if none found in the entity
165 * @return the entity content as a String. May be null if
166 * {@link HttpEntity#getContent()} is null.
167 * @throws ParseException if header elements cannot be parsed
168 * @throws IllegalArgumentException if entity is null or if content length > Integer.MAX_VALUE
169 * @throws IOException if an error occurs reading the input stream
170 */
171 public static String toString(
172 final HttpEntity entity, final String defaultCharset) throws IOException, ParseException {
173 if (entity == null) {
174 throw new IllegalArgumentException("HTTP entity may not be null");
175 }
176 InputStream instream = entity.getContent();
177 if (instream == null) {
178 return null;
179 }
180 try {
181 if (entity.getContentLength() > Integer.MAX_VALUE) {
182 throw new IllegalArgumentException("HTTP entity too large to be buffered in memory");
183 }
184 int i = (int)entity.getContentLength();
185 if (i < 0) {
186 i = 4096;
187 }
188 String charset = getContentCharSet(entity);
189 if (charset == null) {
190 charset = defaultCharset;
191 }
192 if (charset == null) {
193 charset = HTTP.DEFAULT_CONTENT_CHARSET;
194 }
195 Reader reader = new InputStreamReader(instream, charset);
196 CharArrayBuffer buffer = new CharArrayBuffer(i);
197 char[] tmp = new char[1024];
198 int l;
199 while((l = reader.read(tmp)) != -1) {
200 buffer.append(tmp, 0, l);
201 }
202 return buffer.toString();
203 } finally {
204 instream.close();
205 }
206 }
207
208 /**
209 * Read the contents of an entity and return it as a String.
210 * The content is converted using the character set from the entity (if any),
211 * failing that, "ISO-8859-1" is used.
212 *
213 * @param entity
214 * @return String containing the content.
215 * @throws ParseException if header elements cannot be parsed
216 * @throws IllegalArgumentException if entity is null or if content length > Integer.MAX_VALUE
217 * @throws IOException if an error occurs reading the input stream
218 */
219 public static String toString(final HttpEntity entity)
220 throws IOException, ParseException {
221 return toString(entity, null);
222 }
223
224 }

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