Package com.tangosol.util

Class NullImplementation.NullValueExtractor

java.lang.Object
com.tangosol.util.NullImplementation.NullValueExtractor
All Implemented Interfaces:
CanonicallyNamed, ExternalizableLite, PortableObject, Remote.Function, Remote.ToDoubleFunction, Remote.ToIntFunction, Remote.ToLongFunction, ValueExtractor, Serializable, Function, ToDoubleFunction, ToIntFunction, ToLongFunction
Enclosing class:
NullImplementation
public static class NullImplementation.NullValueExtractor extends Object implements ValueExtractor, Serializable, ExternalizableLite, PortableObject
A ValueExtractor that always results in the passed-in value.
See Also:

  • Field Details

  • Constructor Details

    • NullValueExtractor

      public NullValueExtractor()
      Default constructor (for ExternalizableLite and PortableObject).

  • Method Details

    • extract

      public Object extract(Object o)
      Extract the value from the passed object. The returned value may be null. For intrinsic types, the returned value is expected to be a standard wrapper type in the same manner that reflection works; for example, int would be returned as a java.lang.Integer.
      Specified by:
      extract in interface ValueExtractor
      Parameters:
      o - the object to extract the value from
      Returns:
      the extracted value as an Object; null is an acceptable value
      Throws:
      ClassCastException - if this ValueExtractor is incompatible with the passed object to extract a value from and the implementation requires the passed object to be of a certain type
      WrapperException - if this ValueExtractor encounters an exception in the course of extracting the value
      IllegalArgumentException - if this ValueExtractor cannot handle the passed object for any other reason; an implementor should include a descriptive message

    • equals

      public boolean equals(Object o)
      Compare the ValueExtractor with another object to determine equality. Two ValueExtractor objects, ve1 and ve2 are considered equal iff ve1.extract(o) equals ve2.extract(o) for all values of o.
      Specified by:
      equals in interface ValueExtractor
      Overrides:
      equals in class Object
      Returns:
      true iff this ValueExtractor and the passed object are equivalent ValueExtractors

    • hashCode

      public int hashCode()
      Determine a hash value for the ValueExtractor object according to the general Object.hashCode() contract.
      Specified by:
      hashCode in interface ValueExtractor
      Overrides:
      hashCode in class Object
      Returns:
      an integer hash value for this ValueExtractor object

    • toString

      public String toString()
      Provide a human-readable description of this ValueExtractor object.
      Overrides:
      toString in class Object
      Returns:
      a human-readable description of this ValueExtractor object

    • readExternal

      public void readExternal(DataInput in) throws 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:
      IOException - if an I/O exception occurs

    • writeExternal

      public void writeExternal(DataOutput out) throws 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:
      IOException - if an I/O exception occurs

    • readExternal

      public void readExternal(PofReader in) throws 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:
      IOException - if an I/O error occurs

    • writeExternal

      public void writeExternal(PofWriter out) throws 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:
      IOException - if an I/O error occurs