org.brushingbits.jnap.validation.constraints.AbstractConstraintValidator.java Source code

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Here is the source code for org.brushingbits.jnap.validation.constraints.AbstractConstraintValidator.java

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/*
 * AbstractConstraintValidator.java created on 2011-01-15
 *
 * Copyright 2011 Brushing Bits, Inc.
 * http://www.brushingbits.com
 *
 * 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 org.brushingbits.jnap.validation.constraints;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;

import javax.validation.ConstraintValidator;

import org.apache.commons.lang.ArrayUtils;
import org.brushingbits.jnap.util.BeanLocator;
import org.springframework.beans.ConfigurablePropertyAccessor;
import org.springframework.beans.PropertyAccessorFactory;
import org.springframework.util.ReflectionUtils;

/**
 * @author Daniel Rochetti
 * @since 1.0
 */
public abstract class AbstractConstraintValidator<A extends Annotation, T> implements ConstraintValidator<A, T> {

    /* (non-Javadoc)
     * @see javax.validation.ConstraintValidator#initialize(java.lang.annotation.Annotation)
     */
    public void initialize(A constraintAnnotation) {
        bindParameters(constraintAnnotation);
        injectBeans();
        validateParameters();
    }

    /**
     * This method copies all the annotation properties to fields with the same name.
     * 
     * @param constraintAnnotation This constraint annotation.
     * @see PropertyAccessorFactory
     */
    protected void bindParameters(A constraintAnnotation) {
        Class<?> annotationClass = constraintAnnotation.getClass();
        Method[] methods = annotationClass.getDeclaredMethods();
        ConfigurablePropertyAccessor accessor = PropertyAccessorFactory.forDirectFieldAccess(this);
        try {
            for (Method method : methods) {
                String methodName = method.getName();
                if (accessor.isWritableProperty(methodName)) {
                    accessor.setPropertyValue(methodName,
                            method.invoke(constraintAnnotation, ArrayUtils.EMPTY_OBJECT_ARRAY));
                }
            }
        } catch (Exception e) {
            ReflectionUtils.handleReflectionException(e);
        }
    }

    /**
     * 
     * @see BeanLocator#injectBeans(Object)
     */
    private void injectBeans() {
        BeanLocator beanLocator = BeanLocator.get();
        if (beanLocator.isInitialized()) {
            beanLocator.injectBeans(this);
        }
    }

    /**
     * Validates the parameters to assure everything is well set for the validation
     */
    protected void validateParameters() {
        // do nothing
    }

}