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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  package org.apache.hc.core5.http.nio.entity;
28  
29  import java.io.IOException;
30  import java.nio.CharBuffer;
31  
32  import org.apache.hc.core5.http.ContentType;
33  import org.apache.hc.core5.http.HttpException;
34  import org.apache.hc.core5.util.Args;
35  import org.apache.hc.core5.util.CharArrayBuffer;
36  
37  /**
38   * Basic {@link org.apache.hc.core5.http.nio.AsyncEntityConsumer} implementation
39   * that processes the data stream content into a string.
40   *
41   * @since 5.0
42   */
43  public class StringAsyncEntityConsumer extends AbstractCharAsyncEntityConsumer<String> {
44  
45      private final int capacityIncrement;
46      private final CharArrayBuffer content;
47  
48      public StringAsyncEntityConsumer(final int capacityIncrement) {
49          Args.positive(capacityIncrement, "Capacity increment");
50          this.capacityIncrement = capacityIncrement;
51          this.content = new CharArrayBuffer(1024);
52      }
53  
54      public StringAsyncEntityConsumer() {
55          this(Integer.MAX_VALUE);
56      }
57  
58      @Override
59      protected final void streamStart(final ContentType contentType) throws HttpException, IOException {
60      }
61  
62      @Override
63      protected int capacityIncrement() {
64          return capacityIncrement;
65      }
66  
67      @Override
68      protected final void data(final CharBuffer src, final boolean endOfStream) {
69          Args.notNull(src, "CharBuffer");
70          final int chunk = src.remaining();
71          content.ensureCapacity(chunk);
72          src.get(content.array(), content.length(), chunk);
73          content.setLength(content.length() + chunk);
74      }
75  
76      @Override
77      public String generateContent() {
78          return content.toString();
79      }
80  
81      @Override
82      public void releaseResources() {
83      }
84  
85  }