javax.faces.validator.MethodExpressionValidator Maven / Gradle / Ivy
/*
* $Id: MethodExpressionValidator.java,v 1.7 2007/04/27 22:00:11 ofung Exp $
*/
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package javax.faces.validator;
import javax.el.ELContext;
import javax.el.ELException;
import javax.el.MethodExpression;
import javax.faces.application.FacesMessage;
import javax.faces.component.StateHolder;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
/**
* MethodExpressionValidator is a {@link Validator} that
* wraps a {@link MethodExpression}, and it performs validation by executing
* a method on an object identified by the {@link MethodExpression}.
*/
public class MethodExpressionValidator implements Validator, StateHolder {
// ------------------------------------------------------ Instance Variables
private MethodExpression methodExpression = null;
public MethodExpressionValidator() {
super();
}
/**
* Construct a {@link Validator} that contains a {@link MethodExpression}.
*/
public MethodExpressionValidator(MethodExpression methodExpression) {
super();
this.methodExpression = methodExpression;
}
// ------------------------------------------------------- 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) {
try {
ELContext elContext = context.getELContext();
methodExpression.invoke(elContext, new Object[]{context, component, value});
} catch (ELException ee) {
Throwable e = ee.getCause();
if (e instanceof ValidatorException) {
throw (ValidatorException) e;
}
String errInfo = ee.getMessage();
FacesMessage message = new FacesMessage(FacesMessage.SEVERITY_ERROR,
errInfo,
errInfo);
throw new ValidatorException(message, ee.getCause());
}
}
}
// ----------------------------------------------------- StateHolder Methods
public Object saveState(FacesContext context) {
Object values[] = new Object[1];
values[0] = methodExpression;
return (values);
}
public void restoreState(FacesContext context, Object state) {
Object values[] = (Object[]) state;
methodExpression = (MethodExpression) values[0];
}
private boolean transientValue = false;
public boolean isTransient() {
return (this.transientValue);
}
public void setTransient(boolean transientValue) {
this.transientValue = transientValue;
}
}