Class NioByteStoreAccess

java.lang.Object
uk.ac.starlink.table.storage.NioByteStoreAccess
All Implemented Interfaces:
ByteStoreAccess
public abstract class NioByteStoreAccess extends Object implements ByteStoreAccess
Partial implementation of ByteStoreAccess. Not thread-safe.
Since:
20 Aug 2010
Author:
Mark Taylor

  • Constructor Details

    • NioByteStoreAccess

      public NioByteStoreAccess()

  • Method Details

    • getBuffer

      protected abstract ByteBuffer getBuffer(int nbyte) throws IOException
      Returns a buffer with at least the requested number of bytes between the current position and the limit. When nbyte bytes have been read from the returned buffer, the current position of this ByteStoreAccess will have advanced by nbyte bytes. The position in the case that this call is made with no corresponding read is undefined, so it's important that the read is actually done (don't call this method speculatively).

      If no such buffer is available (the end of the storage has been reached), then an IOException will be thrown.

      Parameters:
      nbyte - number of bytes required
      Returns:
      buffer from which nbyte bytes can be read
      Throws:
      IOException

    • readByte

      public byte readByte() throws IOException
      Description copied from interface: ByteStoreAccess
      Reads a byte from the current position.
      Specified by:
      readByte in interface ByteStoreAccess
      Returns:
      read value
      Throws:
      IOException

    • readShort

      public short readShort() throws IOException
      Description copied from interface: ByteStoreAccess
      Reads a short from the current position.
      Specified by:
      readShort in interface ByteStoreAccess
      Returns:
      read value
      Throws:
      IOException

    • readChar

      public char readChar() throws IOException
      Description copied from interface: ByteStoreAccess
      Reads a char from the current position.
      Specified by:
      readChar in interface ByteStoreAccess
      Returns:
      read value
      Throws:
      IOException

    • readInt

      public int readInt() throws IOException
      Description copied from interface: ByteStoreAccess
      Reads an int from the current position.
      Specified by:
      readInt in interface ByteStoreAccess
      Returns:
      read value
      Throws:
      IOException

    • readLong

      public long readLong() throws IOException
      Description copied from interface: ByteStoreAccess
      Reads a long from the current position.
      Specified by:
      readLong in interface ByteStoreAccess
      Returns:
      read value
      Throws:
      IOException

    • readFloat

      public float readFloat() throws IOException
      Description copied from interface: ByteStoreAccess
      Reads a float from the current position.
      Specified by:
      readFloat in interface ByteStoreAccess
      Returns:
      read value
      Throws:
      IOException

    • readDouble

      public double readDouble() throws IOException
      Description copied from interface: ByteStoreAccess
      Reads a double from the current position.
      Specified by:
      readDouble in interface ByteStoreAccess
      Returns:
      read value
      Throws:
      IOException

    • readBytes

      public void readBytes(byte[] b, int offset, int length) throws IOException
      Description copied from interface: ByteStoreAccess
      Reads bytes into a buffer from the current position.
      Specified by:
      readBytes in interface ByteStoreAccess
      Parameters:
      b - buffer to receive bytes
      offset - offset into b for first byte
      length - number of bytes to read
      Throws:
      IOException

    • copyBuffers

      public static ByteBuffer[] copyBuffers(ByteBuffer[] bufs)
      Utility method to make a deep copy of an array of ByteBuffers.
      Parameters:
      bufs - input buffers
      Returns:
      matching array with buffers that are duplicates of the input elements

    • createAccess

      public static ByteStoreAccess createAccess(ByteBuffer[] bbufs)
      Returns a reader implementation for an array of ByteBuffers.
      Parameters:
      bbufs - buffer array
      Returns:
      reader implementation

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