Package nz.org.riskscape.engine.rl

Class RealizedExpressionWrapper

java.lang.Object

nz.org.riskscape.engine.rl.RealizedExpressionWrapper

All Implemented Interfaces:

AutoCloseable, RealizedExpression

public abstract class RealizedExpressionWrapper
extends Object
implements RealizedExpression

Wrapper class for RealizedExpressions that wrap another RealizedExpression. The evaluate methods are left abstract - I think we will always want to implement these for each implementation.

Field Summary

Fields

Modifier and Type	Field	Description
protected final RealizedExpression	wrapped

Constructor Summary

Constructors

Constructor	Description
RealizedExpressionWrapper(RealizedExpression wrapped)

Method Summary

Modifier and Type	Method	Description
void	close()	Destroy/release/abandon any resources associated with this expression.
List<RealizedExpression>	getDependencies()
Expression	getExpression()
Type	getInputType()
Type	getResultType()
boolean	isConstant()	Determine whether this expression is constant, that is the return value of RealizedExpression.evaluateConstant() never changes.

Methods inherited from class java.lang.Object

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

Methods inherited from interface nz.org.riskscape.engine.rl.RealizedExpression

evaluate, evaluateConstant, evaluateValues

Field Details

wrapped

protected final RealizedExpression wrapped

Constructor Details

RealizedExpressionWrapper

public RealizedExpressionWrapper(RealizedExpression wrapped)

Method Details

getInputType

public Type getInputType()

Specified by:

getInputType in interface RealizedExpression

Returns:

the type that this expression was realized for

getResultType

public Type getResultType()

Specified by:

getResultType in interface RealizedExpression

Returns:

the type that this expression yields

getExpression

public Expression getExpression()

Specified by:

getExpression in interface RealizedExpression

Returns:

the AST that this expression was realized from.

getDependencies

public List<RealizedExpression> getDependencies()

Specified by:

getDependencies in interface RealizedExpression

Returns:

any RealizedExpressions that are inputs in to this realized expression

isConstant

public boolean isConstant()

Description copied from interface: RealizedExpression

Determine whether this expression is constant, that is the return value of RealizedExpression.evaluateConstant() never changes. Note that the same can not be said of RealizedExpression.evaluate(Object), as the underlying expression may not be deterministic - the implementation of evaluateConstant should ensure that the expressions result is memoized and the same value returned each time.

Specified by:

isConstant in interface RealizedExpression

Returns:

true if calls to RealizedExpression.evaluateConstant() are allowed against this realized expression.

close

public void close()

Description copied from interface: RealizedExpression

Destroy/release/abandon any resources associated with this expression. Note that a realized expression should propagate closing to any dependencies, as the default implementation does.

See Javadoc Realized for more discussion on the life-cycle of executable objects like these.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface RealizedExpression