DefaultModelValidator.java

/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * 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.kie.workbench.common.forms.processing.engine.handling.impl;

import java.util.Collection;
import java.util.Optional;
import java.util.Set;
import javax.enterprise.context.Dependent;
import javax.enterprise.inject.Default;
import javax.inject.Inject;
import javax.validation.ConstraintViolation;
import javax.validation.Path;
import javax.validation.Validator;

import com.google.gwt.core.client.GWT;
import org.kie.workbench.common.forms.processing.engine.handling.FormField;
import org.kie.workbench.common.forms.processing.engine.handling.ModelValidator;

import static org.kie.workbench.common.forms.processing.engine.handling.FormValidator.NESTED_PROPERTY_SEPARATOR;

@Dependent
@Default
public class DefaultModelValidator<MODEL> implements ModelValidator<MODEL> {

    private Validator validator;

    @Inject
    public DefaultModelValidator(Validator validator) {
        this.validator = validator;
    }

    @Override
    public boolean validate(Collection<FormField> fields,
                            MODEL model) {
        boolean isValid = true;

        try {
            Set<ConstraintViolation<Object>> result = validator.validate(model);

            for (ConstraintViolation<Object> constraintViolation : result) {

                Optional<FormField> found = fields.stream().filter(formField -> {
                    Path propertyPath = constraintViolation.getPropertyPath();

                    String propertyName = propertyPath.iterator().next().getName();

                    if (checkBinding(formField,
                                     propertyName)) {
                        return true;
                    }

                    propertyName = propertyPath.toString().replace(".",
                                                                   NESTED_PROPERTY_SEPARATOR);

                    if (checkBinding(formField,
                                     propertyName)) {
                        return true;
                    }

                    return false;
                }).findFirst();

                if (!found.isPresent()) {
                    continue;
                }

                FormField formField = found.get();
                if (formField == null) {
                    continue;
                }
                isValid = false;
                formField.setError(constraintViolation.getMessage());
            }
        } catch (IllegalArgumentException ex) {
            GWT.log("Error trying to validate model: model does not any validation constraint. ");
        }

        return isValid;
    }

    @Override
    public boolean validate(FormField formField,
                            MODEL model) {
        boolean isValid = true;

        try {
            Set<ConstraintViolation<Object>> result = validator.validate(model);

            for (ConstraintViolation<Object> constraintViolation : result) {

                String propertyName = getFieldNameFromConstraint(constraintViolation,
                                                                 formField.getFieldName().contains(
                                                                         NESTED_PROPERTY_SEPARATOR));

                if (checkBinding(formField,
                                 propertyName)) {
                    formField.setError(constraintViolation.getMessage());
                    return false;
                }
            }
        } catch (IllegalArgumentException ex) {
            GWT.log("Error trying to validate model: model does not any validation constraint. ");
        }

        return isValid;
    }

    protected boolean checkBinding(FormField formField,
                                   String fieldName) {
        if (formField.getFieldName().equals(fieldName) || formField.getFieldBinding().equals(fieldName)) {
            return true;
        }
        return false;
    }

    private String getFieldNameFromConstraint(ConstraintViolation<Object> constraintViolation,
                                              boolean includeNested) {
        if (includeNested) {
            return constraintViolation.getPropertyPath().toString().replace(".",
                                                                            "_");
        }
        return constraintViolation.getPropertyPath().iterator().next().getName();
    }
}