com.goldencode.p2j.util

Class LogicalExpression

java.lang.Object

com.goldencode.p2j.util.LogicalExpression

All Implemented Interfaces:

Resolvable

Direct Known Subclasses:

RuntimeJastInterpreter.LogicalExpressionAdapter

public class LogicalExpression
extends java.lang.Object
implements Resolvable

A convenience adapter class for a Resolvable runtime expression which must return a logical result. Subclasses need implement only the execute() method.

Field Summary

Fields

Modifier and Type	Field and Description
private Accessor	value Any fixed value for the expression or null.

Constructor Summary

Constructors

Constructor and Description
LogicalExpression() Default constructor.
LogicalExpression(Accessor value) Create an instance that has a fixed (non-varying) value.
LogicalExpression(boolean value) Create an instance that has a fixed (non-varying) value.
LogicalExpression(logical value) Create an instance that has a fixed (non-varying) value.

Method Summary

Modifier and Type	Method and Description
logical	execute() Execute the underlying expression and get its result.
java.lang.Class	getType() Report the return type expected from executing the expression.
BaseDataType	resolve() Execute the underlying expression and get its result.

Methods inherited from class java.lang.Object

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

Field Detail

value

private Accessor value

Any fixed value for the expression or null.

Constructor Detail

LogicalExpression

public LogicalExpression()

Default constructor.

LogicalExpression

public LogicalExpression(Accessor value)

Create an instance that has a fixed (non-varying) value.

Parameters:

value - The fixed value for this instance.

LogicalExpression

public LogicalExpression(logical value)

Create an instance that has a fixed (non-varying) value.

Parameters:

value - The fixed value for this instance.

LogicalExpression

public LogicalExpression(boolean value)

Create an instance that has a fixed (non-varying) value.

Parameters:

value - The fixed value for this instance.

Method Detail

resolve

public final BaseDataType resolve()

Execute the underlying expression and get its result.

Specified by:

resolve in interface Resolvable

Returns:

Result of expression execution.

getType

public final java.lang.Class getType()

Report the return type expected from executing the expression.

Specified by:

getType in interface Resolvable

Returns:

Class indicating the type which will be returned by the expression. Must be a variant of BaseDataType.

execute

public logical execute()

Execute the underlying expression and get its result.

Returns:

Result of expression execution as an logical.