experimental/trunk_client_side_validation/validation-modules/property-validation/src/main/java/org/apache/myfaces/extensions/validator/baseval/strategy/JpaValidationStrategy.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.myfaces.extensions.validator.baseval.strategy;

import org.apache.myfaces.extensions.validator.core.annotation.AnnotationEntry;
import org.apache.myfaces.extensions.validator.core.validation.strategy.AbstractValidationStrategy;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.validator.ValidatorException;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.ManyToOne;
import javax.persistence.OneToOne;
import java.lang.annotation.Annotation;

/**
 * @author Gerhard Petracek
 */
public class JpaValidationStrategy extends AbstractValidationStrategy
{

    private static final String VALIDATE_REQUIRED = "required";
    private static final String VALIDATE_LENGTH = "length";

    private String violation;
    private int maxLength;

    public void processValidation(FacesContext facesContext,
            UIComponent uiComponent, AnnotationEntry annotationEntry,
            Object convertedObject) throws ValidatorException
    {
        Annotation annotation = annotationEntry.getAnnotation();
        if (annotation instanceof Column)
        {
            validateColumnAnnotation((Column) annotation, convertedObject);
        }
        else if (annotation instanceof Basic)
        {
            validateBasicAnnotation((Basic) annotation, convertedObject);
        }
        else if (annotation instanceof OneToOne)
        {
            validateOneToOneAnnotation((OneToOne) annotation, convertedObject);
        }
        else if (annotation instanceof ManyToOne)
        {
            validateManyToOneAnnotation((ManyToOne) annotation, convertedObject);
        }
    }

    private void validateColumnAnnotation(Column column, Object convertedObject)
            throws ValidatorException
    {
        if (!column.nullable())
        {
            checkRequiredConvertedObject(convertedObject);
        }

        if (convertedObject == null)
        {
            return;
        }

        if (convertedObject instanceof String
                && column.length() < ((String) convertedObject).length())
        {
            this.violation = VALIDATE_LENGTH;
            this.maxLength = column.length();
            throw new ValidatorException(getValidationErrorFacesMassage(null));
        }
    }

    private void validateBasicAnnotation(Basic basic, Object convertedObject)
            throws ValidatorException
    {
        if (!basic.optional())
        {
            checkRequiredConvertedObject(convertedObject);
        }
    }

    private void validateOneToOneAnnotation(OneToOne oneToOne,
            Object convertedObject)
    {
        if (!oneToOne.optional())
        {
            //TODO
            checkRequiredConvertedObject(convertedObject);
        }
    }

    private void validateManyToOneAnnotation(ManyToOne manyToOne,
            Object convertedObject)
    {
        if (!manyToOne.optional())
        {
            //TODO
            checkRequiredConvertedObject(convertedObject);
        }
    }

    private void checkRequiredConvertedObject(Object convertedObject)
            throws ValidatorException
    {
        if (convertedObject == null || convertedObject.equals(""))
        {
            this.violation = VALIDATE_REQUIRED;
            throw new ValidatorException(getValidationErrorFacesMassage(null));
        }
    }

    protected String getValidationErrorMsgKey(Annotation annotation)
    {
        if (VALIDATE_LENGTH.equals(this.violation))
        {
            return "field_too_long";
        }
        else
        {
            return "field_required";
        }
    }

    protected String getErrorMessageDetails(Annotation annotation)
    {
        String message = super.getErrorMessageDetails(annotation);

        if (VALIDATE_LENGTH.equals(this.violation))
        {
            return message.replace("{0}", "" + this.maxLength);
        }
        else
        {
            return message;
        }
    }
}