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    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.any23.source;
    19
    20  import java.io.ByteArrayOutputStream;
    21  import java.io.IOException;
    22  import java.io.InputStream;
    23
    24  /**
    25   * Creates local copies of {@link DocumentSource} by reading them into an in-memory buffer. This allows opening several
    26   * input streams over the content at lower cost.
    27   *
    28   * @author Richard Cyganiak (richard@cyganiak.de)
    29   */
    30  public class MemCopyFactory implements LocalCopyFactory {
    31
    32      private static final int TEMP_SIZE = 10000;
    33
    34      public static byte[] toByteArray(InputStream in) throws IOException {
    35          ByteArrayOutputStream out = new ByteArrayOutputStream();
    36          byte[] temp = new byte[TEMP_SIZE];
    37          while (true) {
    38              int bytes = in.read(temp);
    39              if (bytes == -1)
    40                  break;
    41              out.write(temp, 0, bytes);
    42          }
    43          return out.toByteArray();
    44      }
    45
    46      public DocumentSource createLocalCopy(final DocumentSource in) throws IOException {
    47          return new ByteArrayDocumentSource(in.openInputStream(), in.getDocumentIRI(), in.getContentType());
    48      }
    49  }