Package org.ngengine.gui.qr

Class BitBuffer

java.lang.Object
org.ngengine.gui.qr.BitBuffer
All Implemented Interfaces:
Cloneable
public final class BitBuffer extends Object implements Cloneable
An appendable sequence of bits (0s and 1s). Mainly used by QrSegment.

  • Constructor Summary

    Constructors
    Constructor
    Description
    BitBuffer()
    Constructs an empty bit buffer (length 0).

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    appendBits(int val, int len)
    Appends the specified number of low-order bits of the specified value to this buffer.
    void
    appendData(BitBuffer bb)
    Appends the content of the specified bit buffer to this buffer.
    int
    bitLength()
    Returns the length of this sequence, which is a non-negative value.
    BitBuffer
    clone()
    Returns a new copy of this buffer.
    int
    getBit(int index)
    Returns the bit at the specified index, yielding 0 or 1.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • BitBuffer

      public BitBuffer()
      Constructs an empty bit buffer (length 0).

  • Method Details

    • bitLength

      public int bitLength()
      Returns the length of this sequence, which is a non-negative value.
      Returns:
      the length of this sequence

    • getBit

      public int getBit(int index)
      Returns the bit at the specified index, yielding 0 or 1.
      Parameters:
      index - the index to get the bit at
      Returns:
      the bit at the specified index
      Throws:
      IndexOutOfBoundsException - if index < 0 or index ≥ bitLength

    • appendBits

      public void appendBits(int val, int len)
      Appends the specified number of low-order bits of the specified value to this buffer. Requires 0 ≤ len ≤ 31 and 0 ≤ val < 2len.
      Parameters:
      val - the value to append
      len - the number of low-order bits in the value to take
      Throws:
      IllegalArgumentException - if the value or number of bits is out of range
      IllegalStateException - if appending the data would make bitLength exceed Integer.MAX_VALUE

    • appendData

      public void appendData(BitBuffer bb)
      Appends the content of the specified bit buffer to this buffer.
      Parameters:
      bb - the bit buffer whose data to append (not null)
      Throws:
      NullPointerException - if the bit buffer is null
      IllegalStateException - if appending the data would make bitLength exceed Integer.MAX_VALUE

    • clone

      public BitBuffer clone()
      Returns a new copy of this buffer.
      Overrides:
      clone in class Object
      Returns:
      a new copy of this buffer (not null)