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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;

import java.lang.annotation.Annotation;

/**
 * Abstract base validation appender that initializes the
 * {@link ConstraintValidation#getValidator()} on post-processing.
 * 
 * @author Carlos Vara
 */
public abstract class BaseAppendValidation implements AppendValidation {

    /**
     * {@inheritDoc}
     *
     * Append operation divided in 3 stages: pre & post processing and the
     * "real" append process.
     */
    public final  void append(ConstraintValidation validation) {
        preProcessValidation(validation);
        performAppend(validation);
        postProcessValidation(validation);
    }

    /**
     * Performs the actual "appending" operation to the underlying data
     * structure that holds the validations. Implementations shouldn't try to do
     * more than that in this step.
     * 
     * @param 
     *            The type of the validation.
     * @param validation
     *            The validation to be appended.
     */
    public abstract  void performAppend(ConstraintValidation validation);

    /**
     * Pre-process the validation before appending it.
     * 
     * @param 
     *            The type of the validation.
     * @param validation
     *            The validation to be appended.
     */
    public  void preProcessValidation(ConstraintValidation validation) {
        // No generic pre-processing
    }
    
    /**
     * Post-process the validation once it has been appended.
     * 
     * @param 
     *            The type of the validation.
     * @param validation
     *            The validation to be appended.
     */
    public  void postProcessValidation(ConstraintValidation validation) {
        // Initialize the validator
        validation.initialize();
    }
    
}