Package org.h2.store

Class Data

java.lang.Object
org.h2.store.Data
public class Data extends Object
This class represents a byte buffer that contains persistent data of a page.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    checkCapacity(int plus)
    Check if there is still enough capacity in the buffer.
    static void
    copyString(Reader source, OutputStream target)
    Copy a String from a reader to an output stream.
    static Data
    create(int capacity)
    Create a new buffer.
    void
    fillAligned()
    Fill up the buffer with empty space and an (initially empty) checksum until the size is a multiple of Constants.FILE_BLOCK_SIZE.
    byte[]
    getBytes()
    Get the byte array used for this page.
    int
    length()
    Get the current write position of this buffer, which is the current length.
    void
    read(byte[] buff, int off, int len)
    Copy a number of bytes to the given buffer from the current position.
    byte
    readByte()
    Read one single byte.
    int
    readInt()
    Read an integer at the current position.
    void
    reset()
    Set the position to 0.
    void
    setPos(int pos)
    Set the current read / write position.
    void
    write(byte[] buff, int off, int len)
    Append a number of bytes to this buffer.
    void
    writeInt(int x)
    Write an integer at the current position.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Method Details

    • writeInt

      public void writeInt(int x)
      Write an integer at the current position. The current position is incremented.
      Parameters:
      x - the value

    • readInt

      public int readInt()
      Read an integer at the current position. The current position is incremented.
      Returns:
      the value

    • create

      public static Data create(int capacity)
      Create a new buffer.
      Parameters:
      capacity - the initial capacity of the buffer
      Returns:
      the buffer

    • length

      public int length()
      Get the current write position of this buffer, which is the current length.
      Returns:
      the length

    • getBytes

      public byte[] getBytes()
      Get the byte array used for this page.
      Returns:
      the byte array

    • reset

      public void reset()
      Set the position to 0.

    • write

      public void write(byte[] buff, int off, int len)
      Append a number of bytes to this buffer.
      Parameters:
      buff - the data
      off - the offset in the data
      len - the length in bytes

    • read

      public void read(byte[] buff, int off, int len)
      Copy a number of bytes to the given buffer from the current position. The current position is incremented accordingly.
      Parameters:
      buff - the output buffer
      off - the offset in the output buffer
      len - the number of bytes to copy

    • setPos

      public void setPos(int pos)
      Set the current read / write position.
      Parameters:
      pos - the new position

    • readByte

      public byte readByte()
      Read one single byte.
      Returns:
      the value

    • checkCapacity

      public void checkCapacity(int plus)
      Check if there is still enough capacity in the buffer. This method extends the buffer if required.
      Parameters:
      plus - the number of additional bytes required

    • fillAligned

      public void fillAligned()
      Fill up the buffer with empty space and an (initially empty) checksum until the size is a multiple of Constants.FILE_BLOCK_SIZE.

    • copyString

      public static void copyString(Reader source, OutputStream target) throws IOException
      Copy a String from a reader to an output stream.
      Parameters:
      source - the reader
      target - the output stream
      Throws:
      IOException - on failure