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package com.sun.faces.taglib.jsf_core;
import com.sun.faces.util.MessageUtils;
import javax.el.ValueExpression;
import javax.faces.component.StateHolder;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.validator.Validator;
import javax.faces.validator.ValidatorException;
import javax.servlet.jsp.JspException;
/**
* Basic implementation of ValidatorELTag.
*/
public class ValidatorTag extends AbstractValidatorTag {
// --------------------------------------------- Methods from ValidatorELTag
@Override
protected Validator createValidator() throws JspException {
if (validatorId != null && validatorId.isLiteralText()) {
return createValidator(validatorId,
binding,
FacesContext.getCurrentInstance());
} else {
return new BindingValidator(validatorId, binding);
}
}
// ----------------------------------------------------------- Inner Classes
public static class BindingValidator implements Validator, StateHolder {
private ValueExpression binding;
private ValueExpression validatorId;
// -------------------------------------------------------- Constructors
/**
* Only used during state restoration
*/
public BindingValidator() { }
public BindingValidator(ValueExpression validatorId,
ValueExpression binding) {
this.validatorId = validatorId;
this.binding = binding;
}
// -------------------------------------------- Methods from StateHolder
private Object[] state;
public Object saveState(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
if (state == null) {
state = new Object[2];
}
state[0] = validatorId;
state[1] = binding;
return state;
}
public void restoreState(FacesContext context, Object state) {
if (context == null) {
throw new NullPointerException();
}
this.state = (Object[]) state;
if (this.state != null) {
this.validatorId = (ValueExpression) this.state[0];
this.binding = (ValueExpression) this.state[1];
}
}
public boolean isTransient() {
return false;
}
public void setTransient(boolean newTransientValue) {
//no-op
}
// ---------------------------------------------- Methods from Validator
/**
* Perform the correctness checks implemented by this
* {@link javax.faces.validator.Validator} against the specified {@link javax.faces.component.UIComponent}.
* If any violations are found, a {@link javax.faces.validator.ValidatorException}
* will be thrown containing the {@link javax.faces.application.FacesMessage} describing
* the failure.
*
* @param context FacesContext for the request we are processing
* @param component UIComponent we are checking for correctness
* @param value the value to validate
* @throws javax.faces.validator.ValidatorException
* if validation fails
* @throws NullPointerException if context
* or component is null
*/
public void validate(FacesContext context,
UIComponent component,
Object value)
throws ValidatorException {
Validator instance = createValidator(validatorId, binding, context);
if (instance != null) {
instance.validate(context, component, value);
} else {
throw new ValidatorException(
MessageUtils.getExceptionMessage(
MessageUtils.CANNOT_VALIDATE_ID,
validatorId != null ? validatorId.getExpressionString() : "",
binding != null ? binding.getExpressionString() : ""));
}
}
}
}