org.apache.openjpa.kernel.exps
Class Param

java.lang.Object
  org.apache.openjpa.kernel.exps.Val
      org.apache.openjpa.kernel.exps.Param

All Implemented Interfaces:

Serializable, Constant, Parameter, Value

 class Param
extends Val
implements Parameter

Represents a parameter.

Author:

Abe White

Constructor Summary

Param(Object key, Class type)
Constructor.

Method Summary

protected Object	eval(Object candidate, Object orig, StoreContext ctx, Object[] params) Return this value for the given candidate.
Object	getParameterKey() Returns the key of the parameter.
Class	getType() Return the expected type for this value, or Object if the type is unknown.
Object	getValue(Object[] params) Return the value for this constant given the specified parameters.
void	setImplicitType(Class type) Set the implicit type of the value, based on how it is used in the filter.
void	setIndex(int index) Set the index of this parameter.

Methods inherited from class org.apache.openjpa.kernel.exps.Val

acceptVisit, eval, evaluate, evaluate, getAlias, getMetaData, getName, getPath, getSelectAs, isAggregate, isVariable, isXPath, setAlias, setMetaData

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.openjpa.kernel.exps.Value

acceptVisit, getAlias, getMetaData, getName, getPath, getSelectAs, isAggregate, isVariable, isXPath, setAlias, setMetaData

Constructor Detail

Param

public Param(Object key,
             Class type)

Constructor. Provide parameter name and type.

Method Detail

getParameterKey

public Object getParameterKey()

Description copied from interface: Parameter

Returns the key of the parameter.

Specified by:

getParameterKey in interface Parameter

getType

public Class getType()

Description copied from interface: Value

Return the expected type for this value, or Object if the type is unknown.

Specified by:

getType in interface Value

setImplicitType

public void setImplicitType(Class type)

Description copied from interface: Value

Set the implicit type of the value, based on how it is used in the filter. This method is only called on values who return Object from Value.getType().

Specified by:

setImplicitType in interface Value

setIndex

public void setIndex(int index)

Description copied from interface: Parameter

Set the index of this parameter.

Specified by:

setIndex in interface Parameter

getValue

public Object getValue(Object[] params)

Description copied from interface: Constant

Return the value for this constant given the specified parameters.

Specified by:

getValue in interface Constant

eval

protected Object eval(Object candidate,
                      Object orig,
                      StoreContext ctx,
                      Object[] params)

Description copied from class: Val

Return this value for the given candidate.

Specified by:

eval in class Val