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Oracle® Coherence Java API Reference
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## com.tangosol.util.filter
Class NotFilter

    java.lang.Object
      com.tangosol.util.Base
          com.tangosol.util.BitHelper
              com.tangosol.util.ExternalizableHelper
                  com.tangosol.util.filter.NotFilter

All Implemented Interfaces:
  ExternalizableLite, PortableObject, Filter, EntryFilter, IndexAwareFilter, java.io.Serializable

    public class NotFilter

extends ExternalizableHelper
implements Filter, EntryFilter, IndexAwareFilter, ExternalizableLite, PortableObject

Filter which negates the results of another filter.

Author:
  cp/gg 2002.10.26

Constructor Summary
`NotFilter()` Default constructor (necessary for the ExternalizableLite interface).
`NotFilter(Filter filter)` Construct a negation filter.

Method Summary
`Filter` | `applyIndex(java.util.Map mapIndexes, java.util.Set setKeys)` Filter remaining keys using a Map of available indexes.
`int` | `calculateEffectiveness(java.util.Map mapIndexes, java.util.Set setKeys)` Given a Map of available indexes, determine if this IndexAwareFilter can use any of the indexes to assist in its processing, and if so, determine how effective the use of that index would be.
`boolean` | `equals(java.lang.Object o)` Compare the NotFilter with another object to determine equality.
`boolean` | `evaluate(java.lang.Object o)` Apply the test to the object.
`boolean` | `evaluateEntry(java.util.Map.Entry entry)` Apply the test to a Map Entry.
`Filter` | `getFilter()` Obtain the Filter whose results are negated by this filter.
`int` | `hashCode()` Determine a hash value for the NotFilter object according to the general `Object.hashCode()` contract.
`void` | `readExternal(java.io.DataInput in)` Restore the contents of this object by loading the object's state from the passed DataInput object.
`void` | `readExternal(PofReader in)` Restore the contents of a user type instance by reading its state using the specified PofReader object.
`java.lang.String` | `toString()` Return a human-readable description for this Filter.
`void` | `writeExternal(java.io.DataOutput out)` Save the contents of this object by storing the object's state into the passed DataOutput object.
`void` | `writeExternal(PofWriter out)` Save the contents of a POF user type instance by writing its state using the specified PofWriter object.

Methods inherited from class com.tangosol.util.BitHelper
`countBits, countBits, countBits, indexOfLSB, indexOfLSB, indexOfLSB, indexOfMSB, indexOfMSB, indexOfMSB, rotateLeft, rotateLeft, rotateLeft, rotateRight, rotateRight, rotateRight, toBitString, toBitString, toBitString`

Constructor Detail

### NotFilter

    public NotFilter()

  Default constructor (necessary for the ExternalizableLite interface).

### NotFilter

    public NotFilter(Filter filter)

  Construct a negation filter.

  Parameters:
    `filter` - the filter whose results this Filter negates

Method Detail

### evaluate

    public boolean evaluate(java.lang.Object o)

  Apply the test to the object.

  Specified by:
    `evaluate` in interface `Filter`
  Parameters:
    `o` - the object to test
  Returns:
    true if the test passes, false otherwise

### evaluateEntry

    public boolean evaluateEntry(java.util.Map.Entry entry)

  Apply the test to a Map Entry.

  Specified by:
    `evaluateEntry` in interface `EntryFilter`
  Parameters:
    `entry` - the Map Entry to evaluate; never null
  Returns:
    true if the test passes, false otherwise

### calculateEffectiveness

    public int calculateEffectiveness(java.util.Map mapIndexes,
                                      java.util.Set setKeys)

  Given a Map of available indexes, determine if this IndexAwareFilter can use any of the indexes to assist in its processing, and if so, determine how effective the use of that index would be.

  The returned value is an effectiveness estimate of how well this filter can use the specified indexes to filter the specified keys. An operation that requires no more than a single access to the index content (i.e. Equals, NotEquals) has an effectiveness of one. Evaluation of a single entry is assumed to have an effectiveness that depends on the index implementation and is usually measured as a constant number of the single operations. This number is referred to as evaluation cost.

  If the effectiveness of a filter evaluates to a number larger than the `keySet.size() * <evaluation cost>` then a user could avoid using the index and iterate through the keySet calling `evaluate` rather then `applyIndex`.

  Specified by:
    `calculateEffectiveness` in interface `IndexAwareFilter`
  Parameters:
    `mapIndexes` - the available `MapIndex` objects keyed by the related ValueExtractor; read-only
    `setKeys` - the set of keys that will be filtered; read-only
  Returns:
    an effectiveness estimate of how well this filter can use the specified indexes to filter the specified keys

### applyIndex

    public Filter applyIndex(java.util.Map mapIndexes,
                             java.util.Set setKeys)

  Filter remaining keys using a Map of available indexes.

  The filter is responsible for removing all keys from the passed set of keys that the applicable indexes can prove should be filtered. If the filter does not fully evaluate the remaining keys using just the index information, it must return a filter (which may be an `EntryFilter`) that can complete the task using an iterating implementation. If, on the other hand, the filter does fully evaluate the remaining keys using just the index information, then it should return null to indicate that no further filtering is necessary.

  Specified by:
    `applyIndex` in interface `IndexAwareFilter`
  Parameters:
    `mapIndexes` - the available `MapIndex` objects keyed by the related ValueExtractor; read-only
    `setKeys` - the mutable set of keys that remain to be filtered
  Returns:
    a `Filter` object (which may be an `EntryFilter`) that can be used to process the remaining keys, or null if no additional filter processing is necessary

### getFilter

    public Filter getFilter()

  Obtain the Filter whose results are negated by this filter.

  Returns:
    the filter whose results are negated by this filter

### equals

    public boolean equals(java.lang.Object o)

  Compare the NotFilter with another object to determine equality.

  Returns:
    true iff this NotFilter and the passed object are equivalent NotFilter objects

### hashCode

    public int hashCode()

  Determine a hash value for the NotFilter object according to the general `Object.hashCode()` contract.

  Returns:
    an integer hash value for this NotFilter object

### toString

    public java.lang.String toString()

  Return a human-readable description for this Filter.

  Returns:
    a String description of the Filter

### readExternal

    public void readExternal(java.io.DataInput in)
                      throws java.io.IOException

  Restore the contents of this object by loading the object's state from the passed DataInput object.

  Specified by:
    `readExternal` in interface `ExternalizableLite`
  Parameters:
    `in` - the DataInput stream to read data from in order to restore the state of this object
  Throws:
    `java.io.IOException` - if an I/O exception occurs
    `java.io.NotActiveException` - if the object is not in its initial state, and therefore cannot be deserialized into

### writeExternal

    public void writeExternal(java.io.DataOutput out)
                       throws java.io.IOException

  Save the contents of this object by storing the object's state into the passed DataOutput object.

  Specified by:
    `writeExternal` in interface `ExternalizableLite`
  Parameters:
    `out` - the DataOutput stream to write the state of this object to
  Throws:
    `java.io.IOException` - if an I/O exception occurs

### readExternal

    public void readExternal(PofReader in)
                      throws java.io.IOException

  Restore the contents of a user type instance by reading its state using the specified PofReader object.

  Specified by:
    `readExternal` in interface `PortableObject`
  Parameters:
    `in` - the PofReader from which to read the object's state
  Throws:
    `java.io.IOException` - if an I/O error occurs

### writeExternal

    public void writeExternal(PofWriter out)
                       throws java.io.IOException

  Save the contents of a POF user type instance by writing its state using the specified PofWriter object.

  Specified by:
    `writeExternal` in interface `PortableObject`
  Parameters:
    `out` - the PofWriter to which to write the object's state
  Throws:
    `java.io.IOException` - if an I/O error occurs

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Oracle® Coherence Java API Reference
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