src/main/java/net/pterodactylus/sonitus/data/source/FileSource.java

   1 /*
   2  * Sonitus - FileSource.java - Copyright © 2013 David Roden
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.pterodactylus.sonitus.data.source;
  19
  20 import static com.google.common.base.Preconditions.*;
  21 import static net.pterodactylus.sonitus.data.Format.UNKNOWN_CHANNELS;
  22 import static net.pterodactylus.sonitus.data.Format.UNKNOWN_ENCODING;
  23 import static net.pterodactylus.sonitus.data.Format.UNKNOWN_FREQUENCY;
  24
  25 import java.io.EOFException;
  26 import java.io.FileInputStream;
  27 import java.io.IOException;
  28 import java.io.InputStream;
  29 import java.util.Arrays;
  30
  31 import net.pterodactylus.sonitus.data.Format;
  32 import net.pterodactylus.sonitus.data.Source;
  33 import net.pterodactylus.sonitus.io.IdentifyingInputStream;
  34
  35 import com.google.common.base.Optional;
  36 import com.google.common.io.ByteStreams;
  37
  38 /**
  39  * A {@link Source} that is read from the local file system.
  40  *
  41  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  42  */
  43 public class FileSource implements Source {
  44
  45         /** The path of the file. */
  46         private final String path;
  47
  48         /** The identified format of the file. */
  49         private final Format format;
  50
  51         /** The input stream. */
  52         private InputStream fileInputStream;
  53
  54         /**
  55          * Creates a new file source.
  56          *
  57          * @param path
  58          *              The path of the file
  59          * @throws IOException
  60          *              if the file can not be found, or an I/O error occurs
  61          */
  62         public FileSource(String path) throws IOException {
  63                 this.path = checkNotNull(path, "path must not be null");
  64                 fileInputStream = new FileInputStream(path);
  65
  66                 /* identify file type. */
  67                 Optional<IdentifyingInputStream> identifyingInputStream = IdentifyingInputStream.create(new FileInputStream(path));
  68                 if (identifyingInputStream.isPresent()) {
  69                         format = identifyingInputStream.get().format();
  70                 } else {
  71                         /* fallback. */
  72                         format = new Format(UNKNOWN_CHANNELS, UNKNOWN_FREQUENCY, UNKNOWN_ENCODING);
  73                 }
  74         }
  75
  76         //
  77         // SOURCE METHODS
  78         //
  79
  80         @Override
  81         public Format format() {
  82                 return format;
  83         }
  84
  85         @Override
  86         public byte[] get(int bufferSize) throws IOException {
  87                 byte[] buffer = new byte[bufferSize];
  88                 int read = ByteStreams.read(fileInputStream, buffer, 0, bufferSize);
  89                 if (read == 0) {
  90                         throw new EOFException();
  91                 }
  92                 return Arrays.copyOf(buffer, read);
  93         }
  94
  95         //
  96         // OBJECT METHODS
  97         //
  98
  99         @Override
 100         public String toString() {
 101                 return String.format("%s (%s)", path, format);
 102         }
 103
 104 }