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PrimeFaces is one of the most popular UI libraries in Java EE Ecosystem and widely used by software companies, world renowned brands, banks, financial institutions, insurance companies, universities and more.

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/**
 * Copyright 2009-2018 PrimeTek.
 *
 * 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.primefaces.metadata.transformer.impl;

import java.io.IOException;
import java.lang.annotation.Annotation;
import java.util.Date;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.el.PropertyNotFoundException;
import javax.faces.component.EditableValueHolder;
import javax.faces.component.UIInput;
import javax.faces.context.FacesContext;
import javax.validation.constraints.Future;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.Past;
import javax.validation.constraints.Size;
import javax.validation.metadata.ConstraintDescriptor;
import org.primefaces.component.calendar.Calendar;
import org.primefaces.component.spinner.Spinner;
import org.primefaces.context.RequestContext;
import org.primefaces.metadata.BeanValidationMetadataExtractor;
import org.primefaces.metadata.transformer.AbstractInputMetadataTransformer;

public class BeanValidationInputMetadataTransformer extends AbstractInputMetadataTransformer {

    private static final Logger LOG = Logger.getLogger(BeanValidationInputMetadataTransformer.class.getName());

    @Override
    public void transformInput(FacesContext context, RequestContext requestContext, UIInput input) throws IOException {

        EditableValueHolder editableValueHolder = (EditableValueHolder) input;

        if (editableValueHolder.isRequired() && isMaxlenghtSet(input)) {
            return;
        }

        try {
            Set> constraints = BeanValidationMetadataExtractor.extractDefaultConstraintDescriptors(
                    context, requestContext, input.getValueExpression("value"));
            if (constraints != null && !constraints.isEmpty()) {
                for (ConstraintDescriptor constraintDescriptor : constraints) {
                    applyConstraint(constraintDescriptor, input, editableValueHolder);
                }
            }
        }
        catch (PropertyNotFoundException e) {
            String message = "Skip transform metadata for component \"" + input.getClientId(context) + "\" because"
                    + " the ValueExpression of the \"value\" attribute"
                    + " isn't resolvable completely (e.g. a sub-expression returns null)";
            LOG.log(Level.FINE, message);
        }
    }

    protected void applyConstraint(ConstraintDescriptor constraintDescriptor, UIInput input, EditableValueHolder editableValueHolder) {

        Annotation constraint = constraintDescriptor.getAnnotation();

        if (!isMaxlenghtSet(input)) {
            if (constraint.annotationType().equals(Size.class)) {
                Size size = (Size) constraint;
                if (size.max() > 0) {
                    setMaxlength(input, size.max());
                }
            }
        }

        if (input instanceof Spinner) {
            Spinner spinner = (Spinner) input;

            if (constraint.annotationType().equals(Max.class) && spinner.getMax() == Double.MAX_VALUE) {
                Max max = (Max) constraint;
                spinner.setMax(max.value());
            }
            if (constraint.annotationType().equals(Min.class) && spinner.getMin() == Double.MIN_VALUE) {
                Min min = (Min) constraint;
                spinner.setMin(min.value());
            }
        }

        if (input instanceof Calendar) {
            Calendar calendar = (Calendar) input;

            if (constraint.annotationType().equals(Past.class) && calendar.getMaxdate() == null) {
                calendar.setMaxdate(new Date());
            }
            if (constraint.annotationType().equals(Future.class) && calendar.getMindate() == null) {
                calendar.setMindate(new Date());
            }
        }
    }
}