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ObServe Toolkit Common Validation module
There is a newer version: 4.34
package fr.ird.observe.validation.validators;

/*-
 * #%L
 * ObServe Toolkit :: Common Validation
 * %%
 * Copyright (C) 2017 - 2020 IRD, Ultreia.io
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import com.opensymphony.xwork2.validator.ValidationException;
import com.opensymphony.xwork2.validator.validators.FieldValidatorSupport;
import fr.ird.observe.dto.reference.ReferentialDtoReference;
import fr.ird.observe.dto.reference.ReferentialDtoReferenceWithNoCodeAware;
import fr.ird.observe.dto.referential.ReferentialDto;
import org.nuiton.decorator.Decorator;
import org.nuiton.decorator.DecoratorProvider;

import java.util.Collection;
import java.util.Objects;

import static io.ultreia.java4all.i18n.I18n.n;

/**
 * Created by tchemit on 19/10/2018.
 *
 * @author Tony Chemit - [email protected]
 */
public class ReferentialUniqueFieldValidator extends FieldValidatorSupport {

    private String badReferentialValue;
    private Decorator decorator;

    public String getBadReferentialValue() {
        return badReferentialValue;
    }

    @Override
    protected void addFieldError(String propertyName, Object object) {
        if (getDefaultMessage().isEmpty()) {
            setDefaultMessage(n("observe.validation.referential.field.unique") + "##${badReferentialValue}");
        }
        super.addFieldError(propertyName, object);
    }

    @Override
    public String getValidatorType() {
        return "referentialUniqueField";
    }

    @Override
    public void validate(Object object) throws ValidationException {
        String fieldName = getFieldName();
        if (ReferentialDto.PROPERTY_CODE.equals(getFieldName()) && object instanceof ReferentialDtoReferenceWithNoCodeAware) {
            return;
        }
        String id = ((ReferentialDto) object).getId();

        Collection collection = (Collection) getFieldValue("editingReferentielList", object);
        Object code = getFieldValue(fieldName, object);
        if (code == null) {
            return;
        }
        for (Object o : collection) {
            ReferentialDtoReference reference = (ReferentialDtoReference) o;
            if (Objects.equals(reference.getId(), id)) {
                continue;
            }
            try {
                if (Objects.equals(reference.get(fieldName), code)) {
                    if (decorator == null) {
                        DecoratorProvider decoratorService = (DecoratorProvider) getFieldValue("decoratorService", object);
                        decorator = decoratorService.getDecorator(reference);
                    }
                    badReferentialValue = decorator.toString(reference);
                    try {
                        addFieldError(fieldName, object);
                    } finally {
                        badReferentialValue = null;
                    }
                    break;
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}