com.luciad.datamodel.expression

LuciadLightspeedClass ALcdDataObjectExpressionLanguage

java.lang.Object

com.luciad.datamodel.expression.ALcdDataObjectExpressionLanguage

Direct Known Subclasses:

TLcdDataObjectExpressionLanguage

public abstract class ALcdDataObjectExpressionLanguage
extends Object

Abstract definition of an expression language that enables the definition and evaluation of expressions over ILcdDataObject instances.

Since:

10.1

See Also:

TLcdDataObjectExpressionLanguage

Constructor Summary

Constructors

Constructor and Description
ALcdDataObjectExpressionLanguage()

Method Summary

Modifier and Type	Method and Description
abstract ILcdDataObjectExpression	compile(String aExpression) Compiles the expression to an intermediate representation.
TLcdDataObjectExpressionContext	createContext(ILcdDataObject aRootObject) Creates a context for the given root object for evaluating expressions.
Object	evaluate(String aExpression, ILcdDataObject aRoot) Returns the result of evaluating the given expression for the given root object.
Object	evaluate(String aExpression, TLcdDataObjectExpressionContext aContext) Returns the result of evaluating the given expression with the given context.

Methods inherited from class java.lang.Object

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

Constructor Detail

ALcdDataObjectExpressionLanguage

public ALcdDataObjectExpressionLanguage()

Method Detail

createContext

public TLcdDataObjectExpressionContext createContext(ILcdDataObject aRootObject)

Creates a context for the given root object for evaluating expressions.

Parameters:

aRootObject - the root object

Returns:

a context that can be used to evaluate expressions

evaluate

public Object evaluate(String aExpression,
                       TLcdDataObjectExpressionContext aContext)

Returns the result of evaluating the given expression with the given context.

Parameters:

aExpression - the expression to evaluate

aContext - the context object

Returns:

the value of the expression evaluation

evaluate

public Object evaluate(String aExpression,
                       ILcdDataObject aRoot)

Returns the result of evaluating the given expression for the given root object.

Parameters:

aExpression - the expression to evaluate

aRoot - the root object

Returns:

the value of the expression evaluation

compile

public abstract ILcdDataObjectExpression compile(String aExpression)

Compiles the expression to an intermediate representation. This can be used to improve performance when the same expression needs to be evaluated in different contexts.

Parameters:

aExpression - the expression to compile

Returns:

a compiled expression