Class NullImplementation.NullValueExtractor

An IValueExtractor that always results in the passed-in value.

Inheritance

object

NullImplementation.NullValueExtractor

Implements

IValueExtractor

IPortableObject

Inherited Members

object.Equals(object, object)

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

Namespace: Tangosol.Util

Assembly: Coherence.dll

Syntax

public class NullImplementation.NullValueExtractor : IValueExtractor, IPortableObject

Fields

Instance

Since the IValueExtractor contains no information, only one ever has to exist.

Declaration

public static readonly NullImplementation.NullValueExtractor Instance

Field Value

Type	Description
NullImplementation.NullValueExtractor

Methods

Equals(object)

Compares this object with another object for equality.

Declaration

public override bool Equals(object o)

Parameters

Type	Name	Description
object	o	An object reference or null.

Returns

Type	Description
bool	true if the passed object reference is of the same class and has the same state as this object.

Overrides

object.Equals(object)

Extract(object)

Extract the value from the passed object.

Declaration

public object Extract(object target)

Parameters

Type	Name	Description
object	target	An object to retrieve the value from.

Returns

Type	Description
object	The extracted value as an object; null is an acceptable value.

Remarks

The returned value may be null.

Exceptions

Type	Condition
InvalidCastException	If this IValueExtractor is incompatible with the passed object to extract a value from and the implementation requires the passed object to be of a certain type.
ArgumentException	If this IValueExtractor cannot handle the passed object for any other reason; an implementor should include a descriptive message.

GetHashCode()

Returns a hash code value for this object.

Declaration

public override int GetHashCode()

Returns

Type	Description
int	A hash code value for this object.

Overrides

object.GetHashCode()

ReadExternal(IPofReader)

Restore the contents of a user type instance by reading its state using the specified IPofReader object.

Declaration

public void ReadExternal(IPofReader reader)

Parameters

Type	Name	Description
IPofReader	reader	The IPofReader from which to read the object's state.

Exceptions

Type	Condition
IOException	If an I/O error occurs.

ToString()

Provide a human-readable representation of this object.

Declaration

public override string ToString()

Returns

Type	Description
string	A string whose contents represent the value of this object.

Overrides

object.ToString()

WriteExternal(IPofWriter)

Save the contents of a POF user type instance by writing its state using the specified IPofWriter object.

Declaration

public void WriteExternal(IPofWriter writer)

Parameters

Type	Name	Description
IPofWriter	writer	The IPofWriter to which to write the object's state.

Exceptions

Type	Condition
IOException	If an I/O error occurs.

Implements

IValueExtractor

IPortableObject