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package javax.faces.validator;
import javax.faces.context.FacesContext;
import javax.faces.component.UIComponent;
import javax.faces.application.FacesMessage;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;
import javax.faces.component.PartialStateHolder;
/**
* A Validator that checks
* against a Regular Expression (which is the pattern property). The
* pattern must resolve to a String that follows the java.util.regex
* standards.
* @since 2.0
*/
public class RegexValidator implements Validator, PartialStateHolder {
private String regex;
/**
* The standard converter id for this converter.
*/
public static final String VALIDATOR_ID = "javax.faces.RegularExpression";
/**
* The message identifier of the {@link
* javax.faces.application.FacesMessage} to be created if the value
* returned from {@link #getPattern} is null or the
* empty String.
*/
public static final String PATTERN_NOT_SET_MESSAGE_ID =
"javax.faces.validator.RegexValidator.PATTERN_NOT_SET";
/**
* The message identifier of the {@link
* javax.faces.application.FacesMessage} to be created if the act of
* matching the value against the pattern returned from {@link
* #getPattern} fails because the value does not match the
* pattern.
*/
public static final String NOT_MATCHED_MESSAGE_ID =
"javax.faces.validator.RegexValidator.NOT_MATCHED";
/**
* The message identifier of the {@link
* javax.faces.application.FacesMessage} to be created if the act of
* matching the value against the pattern returned from {@link
* #getPattern} fails because of a
* PatternSyntaxException.
*/
public static final String MATCH_EXCEPTION_MESSAGE_ID =
"javax.faces.validator.RegexValidator.MATCH_EXCEPTION";
/**
* The Regular Expression property to validate against.
*
* @param pattern a regular expression pattern
*/
public void setPattern(String pattern) {
clearInitialState();
this.regex = pattern;
}
/**
* Return the ValueExpression that yields the
* regular expression pattern when evaluated.
*
* @return the pattern
*/
public String getPattern() {
return this.regex;
}
/**
* Validate a String against a regular expression pattern. The
* full regex pattern must be matched in order to pass the
* validation.
* @param context {@inheritDoc}
* @param component {@inheritDoc}
* @param value {@inheritDoc}
* @throws NullPointerException {@inheritDoc}
* @throws ValidatorException {@inheritDoc}
*/
@Override
public void validate(FacesContext context,
UIComponent component,
Object value) {
if (context == null) {
throw new NullPointerException();
}
if (component == null) {
throw new NullPointerException();
}
if (value == null) {
return;
}
FacesMessage fmsg;
Locale locale = context.getViewRoot().getLocale();
if (regex == null || regex.length() == 0) {
fmsg = MessageFactory.getMessage(locale,
PATTERN_NOT_SET_MESSAGE_ID,
(Object) null);
throw new ValidatorException(fmsg);
}
try {
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher((String) value);
if (!matcher.matches()) {
Object[] params = { regex };
fmsg = MessageFactory.getMessage(locale,
NOT_MATCHED_MESSAGE_ID,
params);
throw new ValidatorException(fmsg);
}
} catch (PatternSyntaxException pse) {
fmsg = MessageFactory.getMessage(locale,
MATCH_EXCEPTION_MESSAGE_ID,
(Object) null);
throw new ValidatorException(fmsg, pse);
}
}
// ----------------------------------------------------- StateHolder Methods
@Override
public Object saveState(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
if (!initialStateMarked()) {
Object values[] = new Object[1];
values[0] = regex;
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;
regex = (String) values[0];
}
}
private boolean transientValue;
@Override
public boolean isTransient() {
return (this.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;
}
}