Class NullImplementation.NullValueExtractor

    • Constructor Detail

      • NullValueExtractor

        public NullValueExtractor()
        Default constructor (for ExternalizableLite and PortableObject).
    • Method Detail

      • 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
        NotActiveException - if the object is not in its initial state, and therefore cannot be deserialized into
      • 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