Package com.tangosol.config.expression

Class NullParameterResolver

java.lang.Object

com.tangosol.config.expression.NullParameterResolver

All Implemented Interfaces:

ParameterResolver, ExternalizableLite, PortableObject, Serializable

public class NullParameterResolver
extends Object
implements ParameterResolver, ExternalizableLite, PortableObject

A NullParameterResolver is a ParameterResolver that always resolves named Parameters to null.

IMPORTANT: Developers should only use this class when they can't easily access the ParameterResolver provided by the CacheConfig getDefaultParameterResolver() method.

In most circumstances this class is only ever used for: a). testing and/or b) those very rare occasions that you need a ParameterResolver and want all parameters resolved to null.

NOTE: This class does not provide a static INSTANCE declaration by design. Developers are not meant to use this class very often and hence we discourage this by not providing an INSTANCE declaration.

Since:

Coherence 12.1.2

Author:

bo 2011.09.27

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
NullParameterResolver()	Default constructor needed for serialization.

Method Summary

Modifier and Type	Method	Description
void	readExternal(PofReader reader)	Restore the contents of a user type instance by reading its state using the specified PofReader object.
void	readExternal(DataInput in)	Restore the contents of this object by loading the object's state from the passed DataInput object.
Parameter	resolve(String sName)	Obtains the specified named Parameter.
void	writeExternal(PofWriter writer)	Save the contents of a POF user type instance by writing its state using the specified PofWriter object.
void	writeExternal(DataOutput out)	Save the contents of this object by storing the object's state into the passed DataOutput object.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NullParameterResolver

public NullParameterResolver()

Default constructor needed for serialization.

Method Detail

resolve

public Parameter resolve(String sName)

Obtains the specified named Parameter.

Specified by:

resolve in interface ParameterResolver

Parameters:

sName - the name of the Parameter

Returns:

the Parameter or null if the Parameter can't be resolved

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 reader)
                  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:

reader - the PofReader from which to read the object's state

Throws:

IOException - if an I/O error occurs

writeExternal

public void writeExternal(PofWriter writer)
                   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:

writer - the PofWriter to which to write the object's state

Throws:

IOException - if an I/O error occurs