/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License.  You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.commons.vfs2.provider.local;
  
  import java.io.EOFException;
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.RandomAccessFile;
  
  import org.apache.commons.vfs2.FileSystemException;
  import org.apache.commons.vfs2.provider.AbstractRandomAccessContent;
  import org.apache.commons.vfs2.util.RandomAccessMode;
  
  /**
   * Implements {@link org.apache.commons.vfs2.RandomAccessContent RandomAccessContent} for local files.
   */
  final class LocalFileRandomAccessContent extends AbstractRandomAccessContent {
  
      private final static int BYTE_VALUE_MASK = 0xFF;
      // private final LocalFile localFile;
      private final RandomAccessFile raf;
  
      private final InputStream rafis;
  
      LocalFileRandomAccessContent(final File localFile, final RandomAccessMode mode) throws FileSystemException {
          super(mode);
  
          try {
              raf = new RandomAccessFile(localFile, mode.getModeString());
              rafis = new InputStream() {
                  @Override
                  public int available() throws IOException {
                      final long available = raf.length() - raf.getFilePointer();
                      if (available > Integer.MAX_VALUE) {
                          return Integer.MAX_VALUE;
                      }
  
                      return (int) available;
                  }
  
                  @Override
                  public void close() throws IOException {
                      raf.close();
                  }
  
                  @Override
                  public int read() throws IOException {
                      try {
                          return raf.readByte() & BYTE_VALUE_MASK;
                      } catch (final EOFException e) {
                          return -1;
                      }
                  }
  
                  @Override
                  public int read(final byte[] b) throws IOException {
                      return raf.read(b);
                  }
  
                  @Override
                  public int read(final byte[] b, final int off, final int len) throws IOException {
                      return raf.read(b, off, len);
                  }
  
                  @Override
                  public long skip(final long n) throws IOException {
                      raf.seek(raf.getFilePointer() + n);
                      return n;
                  }
              };
          } catch (final FileNotFoundException e) {
              throw new FileSystemException("vfs.provider/random-access-open-failed.error", localFile);
          }
      }
  
      @Override
      public void close() throws IOException {
          raf.close();
      }
  
      @Override
      public long getFilePointer() throws IOException {
          return raf.getFilePointer();
     }
 
     @Override
     public InputStream getInputStream() throws IOException {
         return rafis;
     }
 
     @Override
     public long length() throws IOException {
         return raf.length();
     }
 
     @Override
     public boolean readBoolean() throws IOException {
         return raf.readBoolean();
     }
 
     @Override
     public byte readByte() throws IOException {
         return raf.readByte();
     }
 
     @Override
     public char readChar() throws IOException {
         return raf.readChar();
     }
 
     @Override
     public double readDouble() throws IOException {
         return raf.readDouble();
     }
 
     @Override
     public float readFloat() throws IOException {
         return raf.readFloat();
     }
 
     @Override
     public void readFully(final byte[] b) throws IOException {
         raf.readFully(b);
     }
 
     @Override
     public void readFully(final byte[] b, final int off, final int len) throws IOException {
         raf.readFully(b, off, len);
     }
 
     @Override
     public int readInt() throws IOException {
         return raf.readInt();
     }
 
     @Override
     public long readLong() throws IOException {
         return raf.readLong();
     }
 
     @Override
     public short readShort() throws IOException {
         return raf.readShort();
     }
 
     @Override
     public int readUnsignedByte() throws IOException {
         return raf.readUnsignedByte();
     }
 
     @Override
     public int readUnsignedShort() throws IOException {
         return raf.readUnsignedShort();
     }
 
     @Override
     public String readUTF() throws IOException {
         return raf.readUTF();
     }
 
     @Override
     public void seek(final long pos) throws IOException {
         raf.seek(pos);
     }
 
     @Override
     public void setLength(final long newLength) throws IOException {
         raf.setLength(newLength);
     }
 
     @Override
     public int skipBytes(final int n) throws IOException {
         return raf.skipBytes(n);
     }
 
     @Override
     public void write(final byte[] b) throws IOException {
         raf.write(b);
     }
 
     @Override
     public void write(final byte[] b, final int off, final int len) throws IOException {
         raf.write(b, off, len);
     }
 
     @Override
     public void write(final int b) throws IOException {
         raf.write(b);
     }
 
     @Override
     public void writeBoolean(final boolean v) throws IOException {
         raf.writeBoolean(v);
     }
 
     @Override
     public void writeByte(final int v) throws IOException {
         raf.writeByte(v);
     }
 
     @Override
     public void writeBytes(final String s) throws IOException {
         raf.writeBytes(s);
     }
 
     @Override
     public void writeChar(final int v) throws IOException {
         raf.writeChar(v);
     }
 
     @Override
     public void writeChars(final String s) throws IOException {
         raf.writeChars(s);
     }
 
     @Override
     public void writeDouble(final double v) throws IOException {
         raf.writeDouble(v);
     }
 
     @Override
     public void writeFloat(final float v) throws IOException {
         raf.writeFloat(v);
     }
 
     @Override
     public void writeInt(final int v) throws IOException {
         raf.writeInt(v);
     }
 
     @Override
     public void writeLong(final long v) throws IOException {
         raf.writeLong(v);
     }
 
     @Override
     public void writeShort(final int v) throws IOException {
         raf.writeShort(v);
     }
 
     @Override
     public void writeUTF(final String str) throws IOException {
         raf.writeUTF(str);
     }
 }