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package javax.faces.validator;
import javax.faces.component.
UIComponent;
import javax.faces.component.
PartialStateHolder;
import javax.faces.context.
FacesContext;
import javax.faces.convert.
Converter;
/**
* <p><strong
* class="changed_modified_2_0_rev_a">LengthValidator</strong> 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:</p>
* <ul>
* <li>Convert the passed value to a String, if necessary, by calling its
* <code>toString()</code> method.</li>
* <li>If a <code>maximum</code> 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.</li>
* <li>If a <code>minimum</code> 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.</li>
* </ul>
* <p/>
* <p>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 <code>javax.faces.Number</code>. This allows
* the values to be localized according to the current
* <code>Locale</code>.</p>
*/
public class
LengthValidator implements
Validator,
PartialStateHolder {
// ------------------------------------------------------ Manifest Constants
/**
* <p>The standard validator id for this validator.</p>
*/
public static final
String VALIDATOR_ID = "javax.faces.Length";
/**
* <p>The message identifier of the {@link javax.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:
* <ul>
* <li><code>{0}</code> replaced by the configured maximum length.</li>
* <li><code>{1}</code> replaced by a <code>String</code> whose value
* is the label of the input component that produced this message.</li>
* </ul></p>
*/
public static final
String MAXIMUM_MESSAGE_ID =
"javax.faces.validator.LengthValidator.MAXIMUM";
/**
* <p>The message identifier of the {@link javax.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:
* <ul>
* <li><code>{0}</code> replaced by the configured minimum length.</li>
* <li><code>{1}</code> replaced by a <code>String</code> whose value
* is the label of the input component that produced this message.</li>
* </ul></p>
*/
public static final
String MINIMUM_MESSAGE_ID =
"javax.faces.validator.LengthValidator.MINIMUM";
// ------------------------------------------------------------ Constructors
/**
* <p>Construct a {@link Validator} with no preconfigured limits.</p>
*/
public
LengthValidator() {
super();
}
/**
* <p>Construct a {@link Validator} with the specified preconfigured
* limit.</p>
*
* @param maximum Maximum value to allow
*/
public
LengthValidator(int
maximum) {
super();
setMaximum(
maximum);
}
/**
* <p>Construct a {@link Validator} with the specified preconfigured
* limits.</p>
*
* @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;
/**
* <p>Return the maximum length to be enforced by this {@link
* Validator}, or <code>0</code> if the maximum has not been
* set.</p>
*/
public int
getMaximum() {
return (this.
maximum != null ? this.
maximum : 0);
}
/**
* <p>Set the maximum length to be enforced by this {@link Validator}.</p>
*
* @param maximum The new maximum value
*/
public void
setMaximum(int
maximum) {
clearInitialState();
this.
maximum =
maximum;
}
private
Integer minimum;
/**
* <p>Return the minimum length to be enforced by this {@link
* Validator}, or <code>0</code> if the minimum has not been
* set.</p>
*/
public int
getMinimum() {
return (this.
minimum != null ? this.
minimum : 0);
}
/**
* <p>Set the minimum length to be enforced by this {@link Validator}.</p>
*
* @param minimum The new minimum value
*/
public void
setMinimum(int
minimum) {
clearInitialState();
this.
minimum =
minimum;
}
// ------------------------------------------------------- Validator Methods
/**
* @throws NullPointerException {@inheritDoc}
* @throws ValidatorException {@inheritDoc}
*/
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)));
}
}
}
public boolean
equals(
Object otherObj) {
if (!(
otherObj instanceof
LengthValidator)) {
return false;
}
LengthValidator other = (
LengthValidator)
otherObj;
return ((this.
getMaximum() ==
other.
getMaximum())
&& (this.
getMinimum() ==
other.
getMinimum())
&& (this.
isMinimumSet() ==
other.
isMinimumSet())
&& (this.
isMaximumSet() ==
other.
isMaximumSet()));
}
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
/**
* <p>Return the specified attribute value, converted to a
* <code>String</code>.</p>
*
* @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("javax.faces.Number");
return
converter.
getAsString(
context,
component,
toConvert);
}
private boolean
isMaximumSet() {
return (
maximum != null);
}
private boolean
isMinimumSet() {
return (
minimum != null);
}
// ----------------------------------------------------- StateHolder Methods
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;
}
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 = false;
public boolean
isTransient() {
return (this.
transientValue);
}
public void
setTransient(boolean
transientValue) {
this.
transientValue =
transientValue;
}
private boolean
initialState;
public void
markInitialState() {
initialState = true;
}
public boolean
initialStateMarked() {
return
initialState;
}
public void
clearInitialState() {
initialState = false;
}
}