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

    java.lang.Object
      com.tangosol.util.Base
          com.tangosol.util.NullFilter

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

    public class NullFilter

extends Base
implements Filter, java.io.Serializable, ExternalizableLite, PortableObject

Filter which discards null references.

Version:
  1.00 08/17/98
Author:
  Cameron Purdy

Constructor Summary
`NullFilter()` Default constructor (for ExternalizableLite and PortableObject).

Method Summary
`boolean` | `equals(java.lang.Object o)` Compare the NullFilter with another object to determine equality.
`boolean` | `evaluate(java.lang.Object o)` Filter interface: evaluate().
`static NullFilter` | `getInstance()` Returns an instance of the null enumerator.
`int` | `hashCode()` Determine a hash value for the NullFilter 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.

Constructor Detail

### NullFilter

    public NullFilter()

  Default constructor (for ExternalizableLite and PortableObject).

Method Detail

### evaluate

    public boolean evaluate(java.lang.Object o)

  Filter interface: evaluate().

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

### equals

    public boolean equals(java.lang.Object o)

  Compare the NullFilter with another object to determine equality.

  Returns:
    true iff this NullFilter and the passed object are equivalent NullFilters

### hashCode

    public int hashCode()

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

  Returns:
    an integer hash value for this NullFilter 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

### getInstance

    public static final NullFilter getInstance()

  Returns an instance of the null enumerator.

  Returns:
    an Enumeration instance with no values to enumerate.

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Oracle® Coherence Java API Reference
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