Package zext.plantuml.com.google.zxing.common

Class BitArray

java.lang.Object
zext.plantuml.com.google.zxing.common.BitArray
public final class BitArray extends Object

A simple, fast array of bits, represented compactly by an array of ints internally.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    int[]
    bits
     
    int
    size
     

  • Constructor Summary

    Constructors
    Constructor
    Description
    BitArray()
     
    BitArray(int size)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    appendBit(boolean bit)
     
    void
    appendBitArray(BitArray other)
     
    void
    appendBits(int value, int numBits)
    Appends the least-significant bits, from value, in order from most-significant to least-significant.
    void
    clear()
    Clears all bits (sets to false).
    void
    flip(int i)
    Flips bit i.
    boolean
    get(int i)
     
    int[]
    getBitArray()
     
    int
    getSize()
     
    int
    getSizeInBytes()
     
    boolean
    isRange(int start, int end, boolean value)
    Efficient method to check if a range of bits is set, or not set.
    void
    reverse()
    Reverses all bits in the array.
    void
    set(int i)
    Sets bit i.
    void
    setBulk(int i, int newBits)
    Sets a block of 32 bits, starting at bit i.
    void
    toBytes(int bitOffset, byte[] array, int offset, int numBytes)
     
    String
    toString()
     
    void
    xor(BitArray other)
     

    Methods inherited from class java.lang.Object

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

  • Field Details

    • bits

      public int[] bits

    • size

      public int size

  • Constructor Details

    • BitArray

      public BitArray()

    • BitArray

      public BitArray(int size)

  • Method Details

    • getSize

      public int getSize()

    • getSizeInBytes

      public int getSizeInBytes()

    • get

      public boolean get(int i)
      Parameters:
      i - bit to get
      Returns:
      true iff bit i is set

    • set

      public void set(int i)
      Sets bit i.
      Parameters:
      i - bit to set

    • flip

      public void flip(int i)
      Flips bit i.
      Parameters:
      i - bit to set

    • setBulk

      public void setBulk(int i, int newBits)
      Sets a block of 32 bits, starting at bit i.
      Parameters:
      i - first bit to set
      newBits - the new value of the next 32 bits. Note again that the least-significant bit corresponds to bit i, the next-least-significant to i+1, and so on.

    • clear

      public void clear()
      Clears all bits (sets to false).

    • isRange

      public boolean isRange(int start, int end, boolean value)
      Efficient method to check if a range of bits is set, or not set.
      Parameters:
      start - start of range, inclusive.
      end - end of range, exclusive
      value - if true, checks that bits in range are set, otherwise checks that they are not set
      Returns:
      true iff all bits are set or not set in range, according to value argument
      Throws:
      IllegalArgumentException - if end is less than or equal to start

    • appendBit

      public void appendBit(boolean bit)

    • appendBits

      public void appendBits(int value, int numBits)
      Appends the least-significant bits, from value, in order from most-significant to least-significant. For example, appending 6 bits from 0x000001E will append the bits 0, 1, 1, 1, 1, 0 in that order.

    • appendBitArray

      public void appendBitArray(BitArray other)

    • xor

      public void xor(BitArray other)

    • toBytes

      public void toBytes(int bitOffset, byte[] array, int offset, int numBytes)
      Parameters:
      bitOffset - first bit to start writing
      array - array to write into. Bytes are written most-significant byte first. This is the opposite of the internal representation, which is exposed by getBitArray()
      offset - position in array to start writing
      numBytes - how many bytes to write

    • getBitArray

      public int[] getBitArray()
      Returns:
      underlying array of ints. The first element holds the first 32 bits, and the least significant bit is bit 0.

    • reverse

      public void reverse()
      Reverses all bits in the array.

    • toString

      public String toString()
      Overrides:
      toString in class Object