org.apache.lucene.store

## Class ByteBuffersDataInput

- java.lang.Object
- - org.apache.lucene.store.DataInput
  - - org.apache.lucene.store.ByteBuffersDataInput

- All Implemented Interfaces:
    Cloneable, RandomAccessInput, Accountable

      public final class ByteBuffersDataInput
      extends DataInput
      implements Accountable, RandomAccessInput

  A `DataInput` implementing `RandomAccessInput` and reading data from a list of `ByteBuffer`s.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `ByteBuffersDataInput(List<ByteBuffer> buffers)` Read data from a set of contiguous buffers.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `long` | `position()`
    `long` | `ramBytesUsed()` Return the memory usage of this object in bytes.
    `byte` | `readByte()` Reads and returns a single byte.
    `byte` | `readByte(long pos)` Reads a byte at the given position in the file
    `void` | `readBytes(byte[] arr, int off, int len)` Reads a specified number of bytes into an array at the specified offset.
    `void` | `readBytes(ByteBuffer buffer, int len)` Reads exactly `len` bytes into the given buffer.
    `int` | `readInt(long pos)` Reads an integer at the given position in the file
    `long` | `readLong(long pos)` Reads a long at the given position in the file
    `short` | `readShort(long pos)` Reads a short at the given position in the file
    `void` | `seek(long position)`
    `long` | `size()`
    `ByteBuffersDataInput` | `slice(long offset, long length)`
    `String` | `toString()`

    - ### Methods inherited from class org.apache.lucene.store.DataInput

      `clone, readBytes, readInt, readLong, readMapOfStrings, readSetOfStrings, readShort, readString, readVInt, readVLong, readZInt, readZLong, skipBytes`

    - ### Methods inherited from class java.lang.Object

      `equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

    - ### Methods inherited from interface org.apache.lucene.util.Accountable

      `getChildResources`

- - ### Constructor Detail

    - #### ByteBuffersDataInput

          public ByteBuffersDataInput(List<ByteBuffer> buffers)

      Read data from a set of contiguous buffers. All data buffers except for the last one must have an identical remaining number of bytes in the buffer (that is a power of two). The last buffer can be of an arbitrary remaining length.

  - ### Method Detail

    - #### size

          public long size()

    - #### ramBytesUsed

          public long ramBytesUsed()

      Description copied from interface: `Accountable`
      Return the memory usage of this object in bytes. Negative values are illegal.
      Specified by:
        `ramBytesUsed` in interface `Accountable`

    - #### readByte

          public byte readByte()
                        throws EOFException

      Description copied from class: `DataInput`
      Reads and returns a single byte.
      Specified by:
        `readByte` in class `DataInput`
      Throws:
        `EOFException`
      See Also:
        `DataOutput.writeByte(byte)`

    - #### readBytes

          public void readBytes(ByteBuffer buffer,
                                int len)
                         throws EOFException

      Reads exactly `len` bytes into the given buffer. The buffer must have enough remaining limit. If there are fewer than `len` bytes in the input, `EOFException` is thrown.
      Throws:
        `EOFException`

    - #### readBytes

          public void readBytes(byte[] arr,
                                int off,
                                int len)
                         throws EOFException

      Description copied from class: `DataInput`
      Reads a specified number of bytes into an array at the specified offset.
      Specified by:
        `readBytes` in class `DataInput`
      Parameters:
        `arr` - the array to read bytes into
        `off` - the offset in the array to start storing bytes
        `len` - the number of bytes to read
      Throws:
        `EOFException`
      See Also:
        `DataOutput.writeBytes(byte[],int)`

    - #### readByte

          public byte readByte(long pos)

      Description copied from interface: `RandomAccessInput`
      Reads a byte at the given position in the file
      Specified by:
        `readByte` in interface `RandomAccessInput`
      See Also:
        `DataInput.readByte()`

    - #### readShort

          public short readShort(long pos)

      Description copied from interface: `RandomAccessInput`
      Reads a short at the given position in the file
      Specified by:
        `readShort` in interface `RandomAccessInput`
      See Also:
        `DataInput.readShort()`

    - #### readInt

          public int readInt(long pos)

      Description copied from interface: `RandomAccessInput`
      Reads an integer at the given position in the file
      Specified by:
        `readInt` in interface `RandomAccessInput`
      See Also:
        `DataInput.readInt()`

    - #### readLong

          public long readLong(long pos)

      Description copied from interface: `RandomAccessInput`
      Reads a long at the given position in the file
      Specified by:
        `readLong` in interface `RandomAccessInput`
      See Also:
        `DataInput.readLong()`

    - #### position

          public long position()

    - #### seek

          public void seek(long position)
                    throws EOFException

      Throws:
        `EOFException`

    - #### slice

          public ByteBuffersDataInput slice(long offset,
                                            long length)

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

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