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.hc.core5.http.message;
29
30 import java.util.BitSet;
31 import java.util.Iterator;
32
33 import org.apache.hc.core5.http.Header;
34 import org.apache.hc.core5.util.TextUtils;
35 import org.apache.hc.core5.util.Tokenizer;
36
37 /**
38 * {@link java.util.Iterator} of {@link org.apache.hc.core5.http.Header} tokens..
39 *
40 * @since 4.0
41 */
42 public class BasicTokenIterator extends AbstractHeaderElementIterator<String> {
43
44 private static final BitSet COMMA = Tokenizer.INIT_BITSET(',');
45
46 private final Tokenizer tokenizer;
47
48 /**
49 * Creates a new instance of {@link BasicTokenIterator}.
50 *
51 * @param headerIterator the iterator for the headers to tokenize
52 */
53 public BasicTokenIterator(final Iterator<Header> headerIterator) {
54 super(headerIterator);
55 this.tokenizer = Tokenizer.INSTANCE;
56 }
57
58 @Override
59 String parseHeaderElement(final CharSequence buf, final ParserCursor cursor) {
60 final String token = this.tokenizer.parseToken(buf, cursor, COMMA);
61 if (!cursor.atEnd()) {
62 final int pos = cursor.getPos();
63 if (buf.charAt(pos) == ',') {
64 cursor.updatePos(pos + 1);
65 }
66 }
67 return !TextUtils.isBlank(token) ? token : null;
68 }
69
70 }
71