com.bea.p13n.expression.operator
Class SystemCurrentTimeMillis

java.lang.Object
  com.bea.p13n.expression.internal.ComplexExpressionImpl
      com.bea.p13n.expression.operator.Operator
          com.bea.p13n.expression.operator.SystemCurrentTimeMillis

All Implemented Interfaces:

Cloneable, Expression, com.bea.p13n.expression.ExpressionEvents, Serializable

public final class SystemCurrentTimeMillis

extends Operator

Implementation of the SystemCurrentTimeMillis operator. Returns a Double object with the current system time in milliseconds.
Inputs: None.
Returns: A Long that is the result of calling System.currentTimeMillis.

See Also:

Serialized Form

Constructor Summary

SystemCurrentTimeMillis()
A default constructor.

Method Summary

Class[]

getParameterSignature() Returns the parameter signature for this Expression.

Methods inherited from class com.bea.p13n.expression.operator.Operator

leftHandSide, operand, rightHandSide

Methods inherited from class com.bea.p13n.expression.internal.ComplexExpressionImpl

addListener, addSubExpression, clearCache, clone, createProxyExpression, equals, getCachedValue, getParent, getSource, getSubExpression, getSubExpressionCount, getUserData, hashCode, isCached, isCacheEnabled, isEqualitySubExpression, notifyListeners, removeAllSubExpressions, removeListener, removeSubExpression, removeSubExpression, setCachedValue, setCacheEnabled, setParent, setSource, setSubExpression, setUserData, toString, write

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

SystemCurrentTimeMillis

public SystemCurrentTimeMillis()

A default constructor.

Method Detail

getParameterSignature

public Class[] getParameterSignature()

Description copied from interface: Expression

Returns the parameter signature for this Expression. Because the sub-expressions within the Expression are typically arguments or operands, some type validation is performed by examining the class types of the sub-expressions against the Expression's parameter signature.
The tests that are performed are:
1. The number of sub-expressions must equals the number of parameter entries.
2. The class type of any sub-expression (or the result of evaluating the sub-expresssion) must equal the class type of the corresponding parameter entry.
3. Any null parameter entries are ignored and are considered optional sub-expressions.

Returns:

the Class array containing the parameter signature.