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.checkNotNull;
  21
  22 import java.io.EOFException;
  23 import java.io.FileInputStream;
  24 import java.io.IOException;
  25 import java.io.InputStream;
  26 import java.util.Arrays;
  27 import java.util.Collections;
  28 import java.util.List;
  29
  30 import net.pterodactylus.sonitus.data.AbstractFilter;
  31 import net.pterodactylus.sonitus.data.Controller;
  32 import net.pterodactylus.sonitus.data.DataPacket;
  33 import net.pterodactylus.sonitus.data.Filter;
  34 import net.pterodactylus.sonitus.data.Metadata;
  35 import net.pterodactylus.sonitus.io.IdentifyingInputStream;
  36
  37 import com.google.common.base.Optional;
  38
  39 /**
  40  * A {@link Filter} that reads a file from the local file system and does not
  41  * expect any input.
  42  *
  43  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
  44  */
  45 public class FileSource extends AbstractFilter {
  46
  47         /** The path of the file. */
  48         private final String path;
  49
  50         /** The input stream. */
  51         private InputStream fileInputStream;
  52
  53         /**
  54          * Creates a new file source.
  55          *
  56          * @param path
  57          *              The path of the file
  58          * @throws java.io.IOException
  59          *              if the file can not be found, or an I/O error occurs
  60          */
  61         public FileSource(String path) throws IOException {
  62                 super(path);
  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                         metadataUpdated(identifyingInputStream.get().metadata());
  70                 } else {
  71                         /* fallback. */
  72                         metadataUpdated(new Metadata().name(path));
  73                 }
  74         }
  75
  76         //
  77         // FILTER METHODS
  78         //
  79
  80         @Override
  81         public List<Controller<?>> controllers() {
  82                 return Collections.emptyList();
  83         }
  84
  85         @Override
  86         public DataPacket get(int bufferSize) throws IOException {
  87                 byte[] buffer = new byte[bufferSize];
  88                 int read = fileInputStream.read(buffer);
  89                 if (read == -1) {
  90                         throw new EOFException();
  91                 }
  92                 return new DataPacket(metadata(), 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, metadata());
 102         }
 103
 104 }