BeanValidation.java

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package com.sun.faces.util;

import static javax.faces.validator.BeanValidator.VALIDATOR_FACTORY_KEY;
import static javax.validation.Validation.buildDefaultValidatorFactory;

import java.util.Locale;

import javax.faces.FacesException;
import javax.faces.context.FacesContext;
import javax.validation.MessageInterpolator;
import javax.validation.ValidationException;
import javax.validation.Validator;
import javax.validation.ValidatorContext;
import javax.validation.ValidatorFactory;

/**
 * Various utility methods for use with the BeanValidation API in JSF.
 *
 */
public class BeanValidation {

    public static Validator getBeanValidator(FacesContext context) {
        ValidatorFactory validatorFactory = getValidatorFactory(context);
        
        ValidatorContext validatorContext = validatorFactory.usingContext();
        MessageInterpolator jsfMessageInterpolator = new JsfAwareMessageInterpolator(context, validatorFactory.getMessageInterpolator());
        validatorContext.messageInterpolator(jsfMessageInterpolator);
        
        return validatorContext.getValidator();
    }
    
    public static ValidatorFactory getValidatorFactory(FacesContext context) {
        ValidatorFactory validatorFactory = null;
        
        Object cachedObject = context.getExternalContext()
                                     .getApplicationMap()
                                     .get(VALIDATOR_FACTORY_KEY);
        
        
        if (cachedObject instanceof ValidatorFactory) {
            validatorFactory = (ValidatorFactory) cachedObject;
        } else {
            try {
                validatorFactory = buildDefaultValidatorFactory();
            } catch (ValidationException e) {
                throw new FacesException("Could not build a default Bean Validator factory", e);
            }
            
            context.getExternalContext()
                   .getApplicationMap()
                   .put(VALIDATOR_FACTORY_KEY, validatorFactory);
        }
        
        return validatorFactory;
    }

    private static class JsfAwareMessageInterpolator implements MessageInterpolator {

        private final FacesContext context;
        private final MessageInterpolator delegate;

        public JsfAwareMessageInterpolator(FacesContext context, MessageInterpolator delegate) {
            this.context = context;
            this.delegate = delegate;
        }

        @Override
        public String interpolate(String message, MessageInterpolator.Context context) {
            Locale locale = this.context.getViewRoot().getLocale();
            if (locale == null) {
                locale = Locale.getDefault();
            }
            return delegate.interpolate(message, context, locale);
        }

        @Override
        public String interpolate(String message, MessageInterpolator.Context context, Locale locale) {
            return delegate.interpolate(message, context, locale);
        }
    }
    
}