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Oracle® Coherence Java API Reference Release 12.1.2.0.3 E26043-02 |
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java.lang.Object
com.tangosol.util.NullImplementation.NullValueExtractor
public static class NullImplementation.NullValueExtractor
A ValueExtractor that always results in the passed-in value.
Field Summary | |
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static NullImplementation.NullValueExtractor |
INSTANCE Since the ValueExtractor contains no information, only one ever has to exist. |
Constructor Summary | |
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NullImplementation.NullValueExtractor() Default constructor (for ExternalizableLite and PortableObject). |
Method Summary | |
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boolean |
equals(java.lang.Object o) Compare the ValueExtractor with another object to determine equality. |
java.lang.Object |
extract(java.lang.Object o) Extract the value from the passed object. |
int |
hashCode() Determine a hash value for the ValueExtractor 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() Provide a human-readable description of this ValueExtractor object. |
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. |
Field Detail |
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public static final NullImplementation.NullValueExtractor INSTANCE
Constructor Detail |
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public NullImplementation.NullValueExtractor()
Method Detail |
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public java.lang.Object extract(java.lang.Object o)
extract
in interface ValueExtractor
o
- an Object to retrieve the value fromjava.lang.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 typeWrapperException
- if this ValueExtractor encounters an exception in the course of extracting the valuejava.lang.IllegalArgumentException
- if this ValueExtractor cannot handle the passed object for any other reason; an implementor should include a descriptive messagepublic boolean equals(java.lang.Object o)
equals
in interface ValueExtractor
o
- the reference object with which to comparepublic int hashCode()
Object.hashCode()
contract.hashCode
in interface ValueExtractor
public java.lang.String toString()
toString
in interface ValueExtractor
public void readExternal(java.io.DataInput in) throws java.io.IOException
readExternal
in interface ExternalizableLite
in
- the DataInput stream to read data from in order to restore the state of this objectjava.io.IOException
- if an I/O exception occursjava.io.NotActiveException
- if the object is not in its initial state, and therefore cannot be deserialized intopublic void writeExternal(java.io.DataOutput out) throws java.io.IOException
writeExternal
in interface ExternalizableLite
out
- the DataOutput stream to write the state of this object tojava.io.IOException
- if an I/O exception occurspublic void readExternal(PofReader in) throws java.io.IOException
readExternal
in interface PortableObject
in
- the PofReader from which to read the object's statejava.io.IOException
- if an I/O error occurspublic void writeExternal(PofWriter out) throws java.io.IOException
writeExternal
in interface PortableObject
out
- the PofWriter to which to write the object's statejava.io.IOException
- if an I/O error occurs
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Oracle® Coherence Java API Reference Release 12.1.2.0.3 E26043-02 |
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