org.apache.myfaces.commons.validator
Class AbstractCompareToValidator

java.lang.Object
  org.apache.myfaces.commons.validator.ValidatorBase
      org.apache.myfaces.commons.validator.AbstractCompareToValidator

All Implemented Interfaces:

java.util.EventListener, javax.faces.component.StateHolder, javax.faces.validator.Validator

Direct Known Subclasses:

CompareToValidator

public abstract class AbstractCompareToValidator
extends ValidatorBase

Validates this component against another component.

Specify the foreign component with the for={foreign-component-id} attribute.

Valid operator attribute values:

• equals: eq, ==, =,
• not equals: ne, !=,
• greater than: gt, >,
• less than: lt, <,
• greater than or equals: ge, >=,
• less than or equals: le, <=

If the comparator attribute is specified, the component values are compared using the specified java.util.Comparator object. If no comparator is specified, the component values must implement Comparable and are compared using compareTo(). If either value or foreign value does not implement Comparable and no Comparator is specified, validation always succeeds.

Put this validator on the bottom-most component to insure that the foreign component's value has been converted and validated first.

However, this validator will attempt to convert and validate the foreign component's value if this has not already occurred. This process may not be identical to the standard JSF conversion and validation process.

The validation error message key is currently hardcoded as

"{0} value <{1}> must be {2} {3} value <{4}>"

where

• {0} is the parent component id,
• {1} is the parent component value,
• {2} is the operator name,
• {3} is the foreign component id, and
• {4} is the foreign component value.

The alternateOperatorName attribute can specify a custom operator name. For example, use "after" instead of "greater than" when comparing dates. The message attribute can specify an alternate validation error message key. For example, use "{0} must be {2} {3}" to remove values from the message.

Known issues:

• Operator names should be localized.
• The default message key should be localized.
• Perhaps an exception should be thrown if the two values are not Comparable and no Comparator is specified.

Version:

$Revision: 687839 $ $Date: 2008-08-21 14:59:44 -0500 (Thu, 21 Aug 2008) $

Author:

Mike Kienenberger (latest modification by $Author: lu4242 $)

Field Summary

static java.lang.String	COMPARE_TO_MESSAGE_ID The message identifier of the FacesMessage to be created if the comparison check fails.
static java.lang.String	OPERATOR_EQUALS
static java.lang.String	OPERATOR_EQUALS_ALT
static java.lang.String	OPERATOR_EQUALS_ALT2
static java.lang.String	OPERATOR_GREATER_THAN
static java.lang.String	OPERATOR_GREATER_THAN_ALT
static java.lang.String	OPERATOR_GREATER_THAN_OR_EQUALS
static java.lang.String	OPERATOR_GREATER_THAN_OR_EQUALS_ALT
static java.lang.String	OPERATOR_LESS_THAN
static java.lang.String	OPERATOR_LESS_THAN_ALT
static java.lang.String	OPERATOR_LESS_THAN_OR_EQUALS
static java.lang.String	OPERATOR_LESS_THAN_OR_EQUALS_ALT
static java.lang.String	OPERATOR_NOT_EQUALS
static java.lang.String	OPERATOR_NOT_EQUALS_ALT
static java.lang.String	VALIDATOR_ID The standard converter id for this converter.

Fields inherited from interface javax.faces.validator.Validator

NOT_IN_RANGE_MESSAGE_ID

Constructor Summary

AbstractCompareToValidator()

Method Summary

protected java.util.Comparator	createComparator()
abstract java.lang.String	getAlternateOperatorName() custom operator name in error message (ie "after" instead of "greater than" for dates)
protected java.lang.String	getClassCastExceptionMessage(java.lang.String name, java.lang.Class clazz, java.lang.Object object)
abstract java.lang.Object	getComparator() Value binding for an alternate java.util.Comparator object if component values don't implement Comparable
abstract java.lang.String	getFor() The JSF id of the component with which to compare values.
abstract java.lang.String	getOperator() Operator for comparison: equals: eq, ==, =, not equals: ne, !=, greater than: gt, >, less than: lt, <, greater than or equals: ge, >=, less than or equals: le, <=
protected java.lang.String	getOperatorForString(java.lang.String operatorSpecified)
protected java.lang.String	nameForOperator(java.lang.String operator)
abstract void	setAlternateOperatorName(java.lang.String alternateOperatorName)
abstract void	setComparator(java.lang.Object comparator)
abstract void	setFor(java.lang.String string)
abstract void	setOperator(java.lang.String operator)
void	validate(javax.faces.context.FacesContext facesContext, javax.faces.component.UIComponent uiComponent, java.lang.Object value)
protected boolean	validateOperatorOnComparisonResult(java.lang.String operator, int result)

Methods inherited from class org.apache.myfaces.commons.validator.ValidatorBase

getDetailMessage, getFacesContext, getFacesMessage, getMessage, getStringValue, getSummaryMessage, getValueExpression, isTransient, restoreAttachedState, restoreState, saveAttachedState, saveState, setDetailMessage, setMessage, setSummaryMessage, setTransient, setValueExpression

Methods inherited from class java.lang.Object

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

Field Detail

VALIDATOR_ID

public static final java.lang.String VALIDATOR_ID

The standard converter id for this converter.

See Also:

Constant Field Values

COMPARE_TO_MESSAGE_ID

public static final java.lang.String COMPARE_TO_MESSAGE_ID

The message identifier of the FacesMessage to be created if the comparison check fails.

See Also:

Constant Field Values

OPERATOR_EQUALS

public static final java.lang.String OPERATOR_EQUALS

See Also:

Constant Field Values

OPERATOR_NOT_EQUALS

public static final java.lang.String OPERATOR_NOT_EQUALS

See Also:

Constant Field Values

OPERATOR_GREATER_THAN

public static final java.lang.String OPERATOR_GREATER_THAN

See Also:

Constant Field Values

OPERATOR_LESS_THAN

public static final java.lang.String OPERATOR_LESS_THAN

See Also:

Constant Field Values

OPERATOR_GREATER_THAN_OR_EQUALS

public static final java.lang.String OPERATOR_GREATER_THAN_OR_EQUALS

See Also:

Constant Field Values

OPERATOR_LESS_THAN_OR_EQUALS

public static final java.lang.String OPERATOR_LESS_THAN_OR_EQUALS

See Also:

Constant Field Values

OPERATOR_EQUALS_ALT

public static final java.lang.String OPERATOR_EQUALS_ALT

See Also:

Constant Field Values

OPERATOR_NOT_EQUALS_ALT

public static final java.lang.String OPERATOR_NOT_EQUALS_ALT

See Also:

Constant Field Values

OPERATOR_GREATER_THAN_ALT

public static final java.lang.String OPERATOR_GREATER_THAN_ALT

See Also:

Constant Field Values

OPERATOR_LESS_THAN_ALT

public static final java.lang.String OPERATOR_LESS_THAN_ALT

See Also:

Constant Field Values

OPERATOR_GREATER_THAN_OR_EQUALS_ALT

public static final java.lang.String OPERATOR_GREATER_THAN_OR_EQUALS_ALT

See Also:

Constant Field Values

OPERATOR_LESS_THAN_OR_EQUALS_ALT

public static final java.lang.String OPERATOR_LESS_THAN_OR_EQUALS_ALT

See Also:

Constant Field Values

OPERATOR_EQUALS_ALT2

public static final java.lang.String OPERATOR_EQUALS_ALT2

See Also:

Constant Field Values

Constructor Detail

AbstractCompareToValidator

public AbstractCompareToValidator()

Method Detail

getOperatorForString

protected java.lang.String getOperatorForString(java.lang.String operatorSpecified)

nameForOperator

protected java.lang.String nameForOperator(java.lang.String operator)

validateOperatorOnComparisonResult

protected boolean validateOperatorOnComparisonResult(java.lang.String operator,
                                                     int result)

validate

public void validate(javax.faces.context.FacesContext facesContext,
                     javax.faces.component.UIComponent uiComponent,
                     java.lang.Object value)
              throws javax.faces.validator.ValidatorException

Throws:

javax.faces.validator.ValidatorException

getClassCastExceptionMessage

protected java.lang.String getClassCastExceptionMessage(java.lang.String name,
                                                        java.lang.Class clazz,
                                                        java.lang.Object object)

createComparator

protected java.util.Comparator createComparator()

getFor

public abstract java.lang.String getFor()

The JSF id of the component with which to compare values.

Returns:

the foreign component_id, on which a value should be validated

setFor

public abstract void setFor(java.lang.String string)

Parameters:

string - the foreign component_id, on which a value should be validated

getOperator

public abstract java.lang.String getOperator()

Operator for comparison: equals: eq, ==, =, not equals: ne, !=, greater than: gt, >, less than: lt, <, greater than or equals: ge, >=, less than or equals: le, <=

Returns:

setOperator

public abstract void setOperator(java.lang.String operator)

getComparator

public abstract java.lang.Object getComparator()

Value binding for an alternate java.util.Comparator object if component values don't implement Comparable

Returns:

setComparator

public abstract void setComparator(java.lang.Object comparator)

getAlternateOperatorName

public abstract java.lang.String getAlternateOperatorName()

custom operator name in error message (ie "after" instead of "greater than" for dates)

Returns:

setAlternateOperatorName

public abstract void setAlternateOperatorName(java.lang.String alternateOperatorName)