org.apache.lucene.store

## Class BufferedChecksumIndexInput

- java.lang.Object
- - org.apache.lucene.store.DataInput
  - - org.apache.lucene.store.IndexInput
    - - org.apache.lucene.store.ChecksumIndexInput
      - - org.apache.lucene.store.BufferedChecksumIndexInput

- All Implemented Interfaces:
    Closeable, AutoCloseable, Cloneable

      public class BufferedChecksumIndexInput
      extends ChecksumIndexInput

  Simple implementation of `ChecksumIndexInput` that wraps another input and delegates calls.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `BufferedChecksumIndexInput(IndexInput main)` Creates a new BufferedChecksumIndexInput

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `IndexInput` | `clone()` Returns a clone of this stream.
    `void` | `close()` Closes the stream to further operations.
    `long` | `getChecksum()` Returns the current checksum value
    `long` | `getFilePointer()` Returns the current position in this file, where the next read will occur.
    `long` | `length()` The number of bytes in the file.
    `byte` | `readByte()` Reads and returns a single byte.
    `void` | `readBytes(byte[] b, int offset, int len)` Reads a specified number of bytes into an array at the specified offset.
    `IndexInput` | `slice(String sliceDescription, long offset, long length)` Creates a slice of this index input, with the given description, offset, and length.

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

      `seek`

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

      `getFullSliceDescription, randomAccessSlice, toString`

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

      `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`

- - ### Constructor Detail

    - #### BufferedChecksumIndexInput

          public BufferedChecksumIndexInput(IndexInput main)

      Creates a new BufferedChecksumIndexInput

  - ### Method Detail

    - #### readByte

          public byte readByte()
                        throws IOException

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

    - #### readBytes

          public void readBytes(byte[] b,
                                int offset,
                                int len)
                         throws IOException

      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:
        `b` - the array to read bytes into
        `offset` - the offset in the array to start storing bytes
        `len` - the number of bytes to read
      Throws:
        `IOException`
      See Also:
        `DataOutput.writeBytes(byte[],int)`

    - #### getChecksum

          public long getChecksum()

      Description copied from class: `ChecksumIndexInput`
      Returns the current checksum value
      Specified by:
        `getChecksum` in class `ChecksumIndexInput`

    - #### close

          public void close()
                     throws IOException

      Description copied from class: `IndexInput`
      Closes the stream to further operations.
      Specified by:
        `close` in interface `Closeable`
      Specified by:
        `close` in interface `AutoCloseable`
      Specified by:
        `close` in class `IndexInput`
      Throws:
        `IOException`

    - #### getFilePointer

          public long getFilePointer()

      Description copied from class: `IndexInput`
      Returns the current position in this file, where the next read will occur.
      Specified by:
        `getFilePointer` in class `IndexInput`
      See Also:
        `IndexInput.seek(long)`

    - #### length

          public long length()

      Description copied from class: `IndexInput`
      The number of bytes in the file.
      Specified by:
        `length` in class `IndexInput`

    - #### clone

          public IndexInput clone()

      Description copied from class: `IndexInput`
      Returns a clone of this stream.

      Clones of a stream access the same data, and are positioned at the same point as the stream they were cloned from.

      Expert: Subclasses must ensure that clones may be positioned at different points in the input from each other and from the stream they were cloned from.

      Warning: Lucene never closes cloned `IndexInput`s, it will only call `IndexInput.close()` on the original object.

      If you access the cloned IndexInput after closing the original object, any `readXXX` methods will throw `AlreadyClosedException`.

      This method is NOT thread safe, so if the current `IndexInput` is being used by one thread while `clone` is called by another, disaster could strike.

      Overrides:
        `clone` in class `IndexInput`

    - #### slice

          public IndexInput slice(String sliceDescription,
                                  long offset,
                                  long length)
                           throws IOException

      Description copied from class: `IndexInput`
      Creates a slice of this index input, with the given description, offset, and length. The slice is sought to the beginning.
      Specified by:
        `slice` in class `IndexInput`
      Throws:
        `IOException`

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