public static class NullImplementation.NullValueExtractor extends Object implements ValueExtractor, Serializable, ExternalizableLite, PortableObject
Modifier and Type | Field and Description |
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static NullImplementation.NullValueExtractor |
INSTANCE
Since the ValueExtractor contains no information, only one ever has to exist.
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Constructor and Description |
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NullValueExtractor()
Default constructor (for ExternalizableLite and PortableObject).
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Modifier and Type | Method and Description |
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boolean |
equals(Object o)
Compare the ValueExtractor with another object to determine equality.
|
Object |
extract(Object o)
Extract the value from the passed object.
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int |
hashCode()
Determine a hash value for the ValueExtractor object according to the general
Object.hashCode() contract. |
void |
readExternal(DataInput in)
Restore the contents of this object by loading the object's state from the passed DataInput object.
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void |
readExternal(PofReader in)
Restore the contents of a user type instance by reading its state using the specified PofReader object.
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String |
toString()
Provide a human-readable description of this ValueExtractor object.
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void |
writeExternal(DataOutput out)
Save the contents of this object by storing the object's state into the passed DataOutput object.
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void |
writeExternal(PofWriter out)
Save the contents of a POF user type instance by writing its state using the specified PofWriter object.
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait
andThen, apply, applyAsDouble, applyAsInt, applyAsLong, compose, identity, identityCast, of
andThen, compose
public static final NullImplementation.NullValueExtractor INSTANCE
public NullValueExtractor()
public Object extract(Object o)
extract
in interface ValueExtractor
o
- the object to extract the value fromClassCastException
- 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 typeWrapperException
- if this ValueExtractor encounters an exception in the course of extracting the valueIllegalArgumentException
- if this ValueExtractor cannot handle the passed object for any other reason; an implementor should include a descriptive messagepublic boolean equals(Object o)
public int hashCode()
Object.hashCode()
contract.public String toString()
public void readExternal(DataInput in) throws IOException
readExternal
in interface ExternalizableLite
in
- the DataInput stream to read data from in order to restore the state of this objectIOException
- if an I/O exception occursNotActiveException
- if the object is not in its initial state, and therefore cannot be deserialized intopublic void writeExternal(DataOutput out) throws IOException
writeExternal
in interface ExternalizableLite
out
- the DataOutput stream to write the state of this object toIOException
- if an I/O exception occurspublic void readExternal(PofReader in) throws IOException
readExternal
in interface PortableObject
in
- the PofReader from which to read the object's stateIOException
- if an I/O error occurspublic void writeExternal(PofWriter out) throws IOException
writeExternal
in interface PortableObject
out
- the PofWriter to which to write the object's stateIOException
- if an I/O error occurs