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## org.apache.commons.lang
Class BitField

    java.lang.Object
      |
      +--org.apache.commons.lang.BitField

public class BitField
extends Object

Operations on bit-mapped fields.

Since:
  2.0
Version:
  $Id: BitField.java 437554 2006-08-28 06:21:41Z bayard $
Author:
  Apache Jakarta POI, Scott Sanders (sanders at apache dot org), Marc Johnson (mjohnson at apache dot org), Andrew C. Oliver (acoliver at apache dot org), Stephen Colebourne, Pete Gieser, Gary Gregory

Constructor Summary
`BitField(int mask)` Creates a BitField instance.

Method Summary
`int` | `clear(int holder)` Clears the bits.
`byte` | `clearByte(byte holder)` Clears the bits.
`short` | `clearShort(short holder)` Clears the bits.
`int` | `getRawValue(int holder)` Obtains the value for the specified BitField, unshifted.
`short` | `getShortRawValue(short holder)` Obtains the value for the specified BitField, unshifted.
`short` | `getShortValue(short holder)` Obtains the value for the specified BitField, appropriately shifted right, as a short.
`int` | `getValue(int holder)` Obtains the value for the specified BitField, appropriately shifted right.
`boolean` | `isAllSet(int holder)` Returns whether all of the bits are set or not.
`boolean` | `isSet(int holder)` Returns whether the field is set or not.
`int` | `set(int holder)` Sets the bits.
`int` | `setBoolean(int holder, boolean flag)` Sets a boolean BitField.
`byte` | `setByte(byte holder)` Sets the bits.
`byte` | `setByteBoolean(byte holder, boolean flag)` Sets a boolean BitField.
`short` | `setShort(short holder)` Sets the bits.
`short` | `setShortBoolean(short holder, boolean flag)` Sets a boolean BitField.
`short` | `setShortValue(short holder, short value)` Replaces the bits with new values.
`int` | `setValue(int holder, int value)` Replaces the bits with new values.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### BitField

    public BitField(int mask)

  Creates a BitField instance.

  Parameters:
    `mask` - the mask specifying which bits apply to this BitField. Bits that are set in this mask are the bits that this BitField operates on

Method Detail

### getValue

    public int getValue(int holder)

  Obtains the value for the specified BitField, appropriately shifted right.

  Many users of a BitField will want to treat the specified bits as an int value, and will not want to be aware that the value is stored as a BitField (and so shifted left so many bits).

  Parameters:
    `holder` - the int data containing the bits we're interested in
  Returns:
    the selected bits, shifted right appropriately
  See Also:
    `setValue(int,int)`

### getShortValue

    public short getShortValue(short holder)

  Obtains the value for the specified BitField, appropriately shifted right, as a short.

  Many users of a BitField will want to treat the specified bits as an int value, and will not want to be aware that the value is stored as a BitField (and so shifted left so many bits).

  Parameters:
    `holder` - the short data containing the bits we're interested in
  Returns:
    the selected bits, shifted right appropriately
  See Also:
    `setShortValue(short,short)`

### getRawValue

    public int getRawValue(int holder)

  Obtains the value for the specified BitField, unshifted.

  Parameters:
    `holder` - the int data containing the bits we're interested in
  Returns:
    the selected bits

### getShortRawValue

    public short getShortRawValue(short holder)

  Obtains the value for the specified BitField, unshifted.

  Parameters:
    `holder` - the short data containing the bits we're interested in
  Returns:
    the selected bits

### isSet

    public boolean isSet(int holder)

  Returns whether the field is set or not.

  This is most commonly used for a single-bit field, which is often used to represent a boolean value; the results of using it for a multi-bit field is to determine whether *any* of its bits are set.

  Parameters:
    `holder` - the int data containing the bits we're interested in
  Returns:
    `true` if any of the bits are set, else `false`

### isAllSet

    public boolean isAllSet(int holder)

  Returns whether all of the bits are set or not.

  This is a stricter test than `isSet(int)`, in that all of the bits in a multi-bit set must be set for this method to return `true`.

  Parameters:
    `holder` - the int data containing the bits we're interested in
  Returns:
    `true` if all of the bits are set, else `false`

### setValue

    public int setValue(int holder,
                        int value)

  Replaces the bits with new values.

  Parameters:
    `holder` - the int data containing the bits we're interested in
    `value` - the new value for the specified bits
  Returns:
    the value of holder with the bits from the value parameter replacing the old bits
  See Also:
    `getValue(int)`

### setShortValue

    public short setShortValue(short holder,
                               short value)

  Replaces the bits with new values.

  Parameters:
    `holder` - the short data containing the bits we're interested in
    `value` - the new value for the specified bits
  Returns:
    the value of holder with the bits from the value parameter replacing the old bits
  See Also:
    `getShortValue(short)`

### clear

    public int clear(int holder)

  Clears the bits.

  Parameters:
    `holder` - the int data containing the bits we're interested in
  Returns:
    the value of holder with the specified bits cleared (set to `0`)

### clearShort

    public short clearShort(short holder)

  Clears the bits.

  Parameters:
    `holder` - the short data containing the bits we're interested in
  Returns:
    the value of holder with the specified bits cleared (set to `0`)

### clearByte

    public byte clearByte(byte holder)

  Clears the bits.

  Parameters:
    `holder` - the byte data containing the bits we're interested in
  Returns:
    the value of holder with the specified bits cleared (set to `0`)

### set

    public int set(int holder)

  Sets the bits.

  Parameters:
    `holder` - the int data containing the bits we're interested in
  Returns:
    the value of holder with the specified bits set to `1`

### setShort

    public short setShort(short holder)

  Sets the bits.

  Parameters:
    `holder` - the short data containing the bits we're interested in
  Returns:
    the value of holder with the specified bits set to `1`

### setByte

    public byte setByte(byte holder)

  Sets the bits.

  Parameters:
    `holder` - the byte data containing the bits we're interested in
  Returns:
    the value of holder with the specified bits set to `1`

### setBoolean

    public int setBoolean(int holder,
                          boolean flag)

  Sets a boolean BitField.

  Parameters:
    `holder` - the int data containing the bits we're interested in
    `flag` - indicating whether to set or clear the bits
  Returns:
    the value of holder with the specified bits set or cleared

### setShortBoolean

    public short setShortBoolean(short holder,
                                 boolean flag)

  Sets a boolean BitField.

  Parameters:
    `holder` - the short data containing the bits we're interested in
    `flag` - indicating whether to set or clear the bits
  Returns:
    the value of holder with the specified bits set or cleared

### setByteBoolean

    public byte setByteBoolean(byte holder,
                               boolean flag)

  Sets a boolean BitField.

  Parameters:
    `holder` - the byte data containing the bits we're interested in
    `flag` - indicating whether to set or clear the bits
  Returns:
    the value of holder with the specified bits set or cleared

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