com.bea.p13n.expression.operator
Class SystemGetProperty

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

All Implemented Interfaces

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

public final class SystemGetProperty
extends Operator
implements UnaryOperator

Implementation of the SystemGetProperty operator. Returns a String object which is the value of the System property.
Input 1: A String (or expression that evaluates to a String) that is the value of the System property with the given name.
Returns: A String that is the result of calling System.getProperty.

See Also

Serialized Form

Field Summary

Fields inherited from interface com.bea.p13n.expression.operator.UnaryOperator

UNARY_OPERAND_INDEX

Fields inherited from interface com.bea.p13n.expression.ExpressionEvents

EVENT_ADD_SUBEXPRESSION, EVENT_CLEAR_CACHE, EVENT_INTERNAL_MAX, EVENT_REMOVE_SUBEXPRESSION, EVENT_SET_CACHE_ENABLED, EVENT_SET_CACHED_VALUE, EVENT_SET_PARENT, EVENT_SET_SOURCE, EVENT_SET_SUBEXPRESSION, EVENT_SET_USER_DATA

Constructor Summary

SystemGetProperty()
Constructs an empty operator and operands can be added later by calling addSubExpression() on this.

SystemGetProperty(Object name)
Constructs this by storing the given name as an operand of this.

Method Summary

Object	getOperand() Returns unary operand.
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

SystemGetProperty

public SystemGetProperty()

Constructs an empty operator and operands can be added later by calling addSubExpression() on this.

SystemGetProperty

public SystemGetProperty(Object name)

Constructs this by storing the given name as an operand of this.

Parameters

name - A string or an expression resulting in a string that represents a property's name.

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.

Specified by:

getParameterSignature in interface Expression

Returns

the Class array containing the parameter signature.

getOperand

public Object getOperand()

Description copied from interface: UnaryOperator

Returns unary operand.

Specified by:

getOperand in interface UnaryOperator

Returns

An unary operand.