de.jstacs.parameters.validation
Class SimpleStaticConstraint

java.lang.Object
  de.jstacs.parameters.validation.SimpleStaticConstraint

All Implemented Interfaces:

Constraint, Storable, Cloneable

public class SimpleStaticConstraint
extends Object
implements Constraint

Class for a Constraint that checks values against static values using the comparison operators defined in the interface Constraint. As long as just an upper and lower bound shall be checked, NumberValidator has the same functionality and is easier to use. Thus it is recommended to use this class for more complex constraints, e.g. multiple allowed ranges or combinations of static and reference-based constraints.

Author:

Jan Grau

See Also:

NumberValidator

Field Summary

Fields inherited from interface de.jstacs.parameters.validation.Constraint

EQUALS, GEQ, GT, LEQ, LT

Constructor Summary

SimpleStaticConstraint(Number reference, int comparisonOperator)
Creates a new SimpleStaticConstraint from a Number -reference and a comparison operator as defined in Constraint.

SimpleStaticConstraint(StringBuffer representation)
The standard constructor for the interface Storable.

SimpleStaticConstraint(String reference, int comparisonOperator)
Creates a new SimpleStaticConstraint from a String -reference and a comparison operator as defined in Constraint.

Method Summary

boolean	check(Object value) Checks value for the constraint defined in the Constraint.
SimpleStaticConstraint	clone() This method returns a deep copy of the current instance.
void	fromXML(StringBuffer representation) Parses a SimpleStaticConstraint from the XML representation as returned by toXML().
String	getErrorMessage() Returns the message of the last error (missed constraint) or null if the constraint was fulfilled by the last checked value.
StringBuffer	toXML() This method returns an XML representation as StringBuffer of an instance of the implementing class.

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleStaticConstraint

public SimpleStaticConstraint(Number reference,
                              int comparisonOperator)

Creates a new SimpleStaticConstraint from a Number -reference and a comparison operator as defined in Constraint.

Parameters:

reference - the Number-reference

comparisonOperator - the comparison operator

SimpleStaticConstraint

public SimpleStaticConstraint(String reference,
                              int comparisonOperator)

Creates a new SimpleStaticConstraint from a String -reference and a comparison operator as defined in Constraint.

Parameters:

reference - the String-reference

comparisonOperator - the comparison operator

SimpleStaticConstraint

public SimpleStaticConstraint(StringBuffer representation)
                       throws NonParsableException

The standard constructor for the interface Storable. Creates a new SimpleStaticConstraint from its XML representation.

Parameters:

representation - the XML representation as StringBuffer

Throws:

NonParsableException - if representation could not be parsed

Method Detail

clone

public SimpleStaticConstraint clone()
                             throws CloneNotSupportedException

Description copied from interface: Constraint

This method returns a deep copy of the current instance.

Specified by:

clone in interface Constraint

Overrides:

clone in class Object

Returns:

a deep copy of the current instance

Throws:

CloneNotSupportedException - if the Constraint could not be cloned

See Also:

Cloneable

check

public boolean check(Object value)

Description copied from interface: Constraint

Checks value for the constraint defined in the Constraint. If the constraint is fulfilled, true is returned.

Specified by:

check in interface Constraint

Parameters:

value - the Object to be checked

Returns:

true if the constraint is fulfilled, false otherwise

toXML

public StringBuffer toXML()

Description copied from interface: Storable

This method returns an XML representation as StringBuffer of an instance of the implementing class.

Specified by:

toXML in interface Storable

Returns:

the XML representation

fromXML

public void fromXML(StringBuffer representation)
             throws NonParsableException

Parses a SimpleStaticConstraint from the XML representation as returned by toXML().

Parameters:

representation - the XML representation

Throws:

NonParsableException - the XML code could not be parsed

getErrorMessage

public String getErrorMessage()

Description copied from interface: Constraint

Returns the message of the last error (missed constraint) or null if the constraint was fulfilled by the last checked value.

Specified by:

getErrorMessage in interface Constraint

Returns:

the message of the last error or null