jakarta.faces.validator.LengthValidator Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.faces.validator;
import jakarta.faces.component.PartialStateHolder;
import jakarta.faces.component.UIComponent;
import jakarta.faces.context.FacesContext;
import jakarta.faces.convert.Converter;
/**
*
* LengthValidator is a {@link Validator} that checks the number of
* characters in the String representation of the value of the associated component. The following algorithm is
* implemented:
*
*
*
* - Convert the passed value to a String, if necessary, by calling its
toString() method.
* - If a
maximum property has been configured on this {@link Validator}, check the length of the
* converted String against this limit. If the String length is larger than the specified maximum, throw a
* {@link ValidatorException} containing a a MAXIMUM_MESSAGE_ID message.
* - If a
minimum property has been configured on this {@link Validator}, check the length of the
* converted String against this limit. If the String length is less than the specified minimum, throw a
* {@link ValidatorException} containing a a MINIMUM_MESSAGE_ID message.
*
*
*
* For all of the above cases that cause a {@link ValidatorException} to be thrown, if there are parameters to the
* message that match up with validator parameters, the values of these parameters must be converted using the
* {@link Converter} registered in the application under the converter id jakarta.faces.Number. This allows
* the values to be localized according to the current Locale.
*
*/
public class LengthValidator implements Validator, PartialStateHolder {
// ------------------------------------------------------ Manifest Constants
/**
*
* The standard validator id for this validator.
*
*/
public static final String VALIDATOR_ID = "jakarta.faces.Length";
/**
*
* The message identifier of the {@link jakarta.faces.application.FacesMessage} to be created if the maximum length
* check fails. The message format string for this message may optionally include the following placeholders:
*
* {0} replaced by the configured maximum length.{1} replaced by a String whose value is the label of the input component that produced
* this message.
*/
public static final String MAXIMUM_MESSAGE_ID = "jakarta.faces.validator.LengthValidator.MAXIMUM";
/**
*
* The message identifier of the {@link jakarta.faces.application.FacesMessage} to be created if the minimum length
* check fails. The message format string for this message may optionally include the following placeholders:
*
* {0} replaced by the configured minimum length.{1} replaced by a String whose value is the label of the input component that produced
* this message.
*/
public static final String MINIMUM_MESSAGE_ID = "jakarta.faces.validator.LengthValidator.MINIMUM";
// ------------------------------------------------------------ Constructors
/**
*
* Construct a {@link Validator} with no preconfigured limits.
*
*/
public LengthValidator() {
super();
}
/**
*
* Construct a {@link Validator} with the specified preconfigured limit.
*
*
* @param maximum Maximum value to allow
*/
public LengthValidator(int maximum) {
super();
setMaximum(maximum);
}
/**
*
* Construct a {@link Validator} with the specified preconfigured limits.
*
*
* @param maximum Maximum value to allow
* @param minimum Minimum value to allow
*/
public LengthValidator(int maximum, int minimum) {
super();
setMaximum(maximum);
setMinimum(minimum);
}
// -------------------------------------------------------------- Properties
private Integer maximum;
/**
*
* Return the maximum length to be enforced by this {@link Validator}, or 0 if the maximum has not been
* set.
*
*
* @return the maximum
*/
public int getMaximum() {
return maximum != null ? maximum : 0;
}
/**
*
* Set the maximum length to be enforced by this {@link Validator}.
*
*
* @param maximum The new maximum value
*/
public void setMaximum(int maximum) {
clearInitialState();
this.maximum = maximum;
}
private Integer minimum;
/**
*
* Return the minimum length to be enforced by this {@link Validator}, or 0 if the minimum has not been
* set.
*
*
* @return the minimum
*/
public int getMinimum() {
return minimum != null ? minimum : 0;
}
/**
*
* Set the minimum length to be enforced by this {@link Validator}.
*
*
* @param minimum The new minimum value
*/
public void setMinimum(int minimum) {
clearInitialState();
this.minimum = minimum;
}
// ------------------------------------------------------- Validator Methods
/**
* @throws NullPointerException {@inheritDoc}
* @throws ValidatorException {@inheritDoc}
*/
@Override
public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
if (context == null || component == null) {
throw new NullPointerException();
}
if (value != null) {
String converted = stringValue(value);
if (isMaximumSet() && converted.length() > maximum) {
throw new ValidatorException(MessageFactory.getMessage(context, MAXIMUM_MESSAGE_ID, integerToString(component, maximum, context),
MessageFactory.getLabel(context, component)));
}
if (isMinimumSet() && converted.length() < minimum) {
throw new ValidatorException(MessageFactory.getMessage(context, MINIMUM_MESSAGE_ID, integerToString(component, minimum, context),
MessageFactory.getLabel(context, component)));
}
}
}
@Override
public boolean equals(Object otherObj) {
if (!(otherObj instanceof LengthValidator)) {
return false;
}
LengthValidator other = (LengthValidator) otherObj;
return getMaximum() == other.getMaximum() && getMinimum() == other.getMinimum() && isMinimumSet() == other.isMinimumSet()
&& isMaximumSet() == other.isMaximumSet();
}
@Override
public int hashCode() {
int hashCode = Integer.valueOf(getMinimum()).hashCode() + Integer.valueOf(getMaximum()).hashCode() + Boolean.valueOf(isMaximumSet()).hashCode()
+ Boolean.valueOf(isMinimumSet()).hashCode();
return hashCode;
}
// -------------------------------------------------------- Private Methods
/**
*
* Return the specified attribute value, converted to a String.
*
*
* @param attributeValue The attribute value to be converted
*/
private static String stringValue(Object attributeValue) {
if (attributeValue == null) {
return null;
} else if (attributeValue instanceof String) {
return (String) attributeValue;
} else {
return attributeValue.toString();
}
}
private static String integerToString(UIComponent component, Integer toConvert, FacesContext context) {
Converter converter = context.getApplication().createConverter("jakarta.faces.Number");
return converter.getAsString(context, component, toConvert);
}
private boolean isMaximumSet() {
return maximum != null;
}
private boolean isMinimumSet() {
return minimum != null;
}
// ----------------------------------------------------- StateHolder Methods
@Override
public Object saveState(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
if (!initialStateMarked()) {
Object values[] = new Object[2];
values[0] = maximum;
values[1] = minimum;
return values;
}
return null;
}
@Override
public void restoreState(FacesContext context, Object state) {
if (context == null) {
throw new NullPointerException();
}
if (state != null) {
Object values[] = (Object[]) state;
maximum = (Integer) values[0];
minimum = (Integer) values[1];
}
}
private boolean transientValue;
@Override
public boolean isTransient() {
return transientValue;
}
@Override
public void setTransient(boolean transientValue) {
this.transientValue = transientValue;
}
private boolean initialState;
@Override
public void markInitialState() {
initialState = true;
}
@Override
public boolean initialStateMarked() {
return initialState;
}
@Override
public void clearInitialState() {
initialState = false;
}
}