org.araneaframework.backend.list.memorybased.expression.compare
Class ComparableExpression

java.lang.Object
  org.araneaframework.backend.list.memorybased.expression.compare.ComparableExpression

All Implemented Interfaces:

CompositeExpression, Expression, Serializable, StringExpression

Direct Known Subclasses:

ComparedEqualsExpression, GreaterThanExpression, LowerThanExpression

public abstract class ComparableExpression

extends Object

implements CompositeExpression, StringExpression

See Also:

Serialized Form

Field Summary

protected Comparator	comparator
protected Expression	expr1
protected Expression	expr2

Constructor Summary

ComparableExpression(Expression expr1, Expression expr2)

ComparableExpression(Expression expr1, Expression expr2, Comparator comparator)

Method Summary

protected abstract boolean	doEvaluate(Object value1, Object value2)
Object	evaluate(VariableResolver resolver) Evaluates this Expression by returning its value.
Expression[]	getChildren()
Comparator	getComparator()
boolean	getIgnoreCase()

Methods inherited from class java.lang.Object

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

Field Detail

expr1

protected Expression expr1

expr2

protected Expression expr2

comparator

protected Comparator comparator

Constructor Detail

ComparableExpression

public ComparableExpression(Expression expr1,
                            Expression expr2,
                            Comparator comparator)

ComparableExpression

public ComparableExpression(Expression expr1,
                            Expression expr2)

Method Detail

getComparator

public Comparator getComparator()

evaluate

public final Object evaluate(VariableResolver resolver)
                      throws ExpressionEvaluationException

Description copied from interface: Expression

Evaluates this Expression by returning its value. The returned value may also be null.

Specified by:

evaluate in interface Expression

Parameters:

resolver - Resolver that is used to evalute Variables.

Returns:

the value of this Expression.

Throws:

ExpressionEvaluationException - when the evaluating fails.

doEvaluate

protected abstract boolean doEvaluate(Object value1,
                                      Object value2)

getChildren

public Expression[] getChildren()

Specified by:

getChildren in interface CompositeExpression

getIgnoreCase

public boolean getIgnoreCase()

Specified by:

getIgnoreCase in interface StringExpression