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Anteros Bean Validation for Java.

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/*******************************************************************************
 * Copyright 2012 Anteros Tecnologia
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package br.com.anteros.bean.validation.util;

import br.com.anteros.bean.validation.ConstraintAnnotationAttributes;
import br.com.anteros.validation.api.Constraint;
import br.com.anteros.validation.api.ConstraintDefinitionException;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Locale;

/**
 * Internal validator that ensures the correct definition of constraint
 * annotations.
 * 
 * @author Carlos Vara
 */
public class ConstraintDefinitionValidator {

    /**
     * Ensures that the constraint definition is valid.
     * 
     * @param annotation
     *            An annotation which is annotated with {@link Constraint}.
     * @throws ConstraintDefinitionException
     *             In case the constraint is invalid.
     */
    public static void validateConstraintDefinition(Annotation annotation) {
        ConstraintAnnotationAttributes.GROUPS.validateOn(annotation.annotationType());
        ConstraintAnnotationAttributes.PAYLOAD.validateOn(annotation.annotationType());
        ConstraintAnnotationAttributes.MESSAGE.validateOn(annotation.annotationType());
        validAttributes(annotation);
    }

    /**
     * Check that the annotation has no methods that start with "valid".
     * 
     * @param annotation
     *            The annotation to check.
     */
    private static void validAttributes(final Annotation annotation) {
        final Method[] methods = run(SecureActions.getDeclaredMethods(annotation.annotationType()));
        for (Method method : methods ){
            // Currently case insensitive, the spec is unclear about this
            if (method.getName().toLowerCase(Locale.ENGLISH).startsWith("valid")) {
                throw new ConstraintDefinitionException(
                    "A constraint annotation cannot have methods which start with 'valid'");
            }
        }
    }

    private static  T run(PrivilegedAction action) {
        if (System.getSecurityManager() != null) {
            return AccessController.doPrivileged(action);
        } else {
            return action.run();
        }
    }
}