Package org.eclipse.mat.collect

Class BitField

java.lang.Object
org.eclipse.mat.collect.BitField
All Implemented Interfaces:
Serializable
public final class BitField extends Object implements Serializable
This class manages huge bit fields. It is much faster than BitSet and was specifically developed to be used with huge bit sets in ISnapshot (e.g. needed in virtual GC traces). Out of performance reasons no method does any parameter checking, i.e. only valid values are expected.
See Also:

  • Constructor Summary

    Constructors
    Constructor
    Description
    BitField(int size)
    Creates a bit field with the given number of bits.

  • Method Summary

    Modifier and Type
    Method
    Description
    final void
    clear(int index)
    Clears the bit on the given index.
    final boolean
    get(int index)
    Gets the bit on the given index.
    final void
    set(int index)
    Sets the bit on the given index.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • BitField

      public BitField(int size)
      Creates a bit field with the given number of bits. Size is expected to be positive - out of performance reasons no checks are done!
      Parameters:
      size - the maximum size of the BitField

  • Method Details

    • set

      public final void set(int index)
      Sets the bit on the given index. Index is expected to be in range - out of performance reasons no checks are done!
      Parameters:
      index - The 0-based index into the BitField.

    • clear

      public final void clear(int index)
      Clears the bit on the given index. Index is expected to be in range - out of performance reasons no checks are done!
      Parameters:
      index - The 0-based index into the BitField.

    • get

      public final boolean get(int index)
      Gets the bit on the given index. Index is expected to be in range - out of performance reasons no checks are done!
      Parameters:
      index - The 0-based index into the BitField.
      Returns:
      true if the BitField was set, false if it was cleared or never set.