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com.tangosol.coherence.config
Class ParameterMacroExpression

java.lang.Object
com.tangosol.coherence.config.ParameterMacroExpression

All Implemented Interfaces:

com.tangosol.config.expression.Expression, ExternalizableLite, PortableObject, java.io.Serializable

public class ParameterMacroExpression

extends java.lang.Object

implements com.tangosol.config.expression.Expression, ExternalizableLite, PortableObject

A ParameterMacroExpression is an Expression representing the use of a Coherence Parameter Macro, typically occurring with in a Coherence Cache Configuration file.

Coherence Macro Parameters are syntactically represented as follows:

{parameter-name [default-value]}

When a ParameterMacroExpression is evaluated the parameter-name and it's associated value is resolved by consulting the provided ParameterResolver. If the parameter is resolvable, the value of the resolved parameter is returned. If it's not resolvable the default value is returned.

Note: Returned values are always coerced into the type defined by the Expression.

Since:

Coherence 12.1.2

Author:

bo 2011.06.22

Constructor Summary

ParameterMacroExpression()
Default constructor needed for serialization.

ParameterMacroExpression(java.lang.String sExpression, java.lang.Class clzResultType)
Construct a ParameterMacroExpression.

Method Summary

java.lang.Object	evaluate(com.tangosol.config.expression.ParameterResolver resolver)
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()
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.

Constructor Detail

ParameterMacroExpression

public ParameterMacroExpression()

Default constructor needed for serialization.

ParameterMacroExpression

public ParameterMacroExpression(java.lang.String sExpression,
                                java.lang.Class clzResultType)

Construct a ParameterMacroExpression.

Parameters:

sExpression - a string representation of the Expression

clzResultType - the type of value the Expression will return when evaluated

Method Detail

evaluate

public java.lang.Object evaluate(com.tangosol.config.expression.ParameterResolver resolver)

Specified by:

evaluate in interface com.tangosol.config.expression.Expression

readExternal

public void readExternal(java.io.DataInput in)
                  throws java.io.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:

java.io.IOException - if an I/O exception occurs

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

writeExternal

public void writeExternal(java.io.DataOutput out)
                   throws java.io.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:

java.io.IOException - if an I/O exception occurs

readExternal

public void readExternal(PofReader in)
                  throws java.io.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:

java.io.IOException - if an I/O error occurs

writeExternal

public void writeExternal(PofWriter out)
                   throws java.io.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:

java.io.IOException - if an I/O error occurs

toString

public java.lang.String toString()

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