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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 org.apache.hc.core5.http.message;
29  
30  import java.util.Iterator;
31  
32  import org.apache.hc.core5.http.Header;
33  import org.apache.hc.core5.http.HeaderElement;
34  import org.apache.hc.core5.util.Args;
35  
36  /**
37   * {@link java.util.Iterator} of {@link org.apache.hc.core5.http.HeaderElement}s.
38   *
39   * @since 4.0
40   */
41  public class BasicHeaderElementIterator extends AbstractHeaderElementIterator<HeaderElement> {
42  
43      private final HeaderValueParser parser;
44  
45      /**
46       * Creates a new instance of BasicHeaderElementIterator
47       */
48      public BasicHeaderElementIterator(
49              final Iterator<Header> headerIterator,
50              final HeaderValueParser parser) {
51          super(headerIterator);
52          this.parser = Args.notNull(parser, "Parser");
53      }
54  
55      public BasicHeaderElementIterator(final Iterator<Header> headerIterator) {
56          this(headerIterator, BasicHeaderValueParser.INSTANCE);
57      }
58  
59      @Override
60      HeaderElement parseHeaderElement(final CharSequence buf, final ParserCursor cursor) {
61          final HeaderElement e = this.parser.parseHeaderElement(buf, cursor);
62          if (!(e.getName().length() == 0 && e.getValue() == null)) {
63              return e;
64          }
65          return null;
66      }
67  
68  }