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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.google.common.collect.ImmutableSet;
import com.opensymphony.xwork2.validator.ValidationException;
import fr.ird.observe.dto.decoration.I18nDecoratorHelper;
import fr.ird.observe.dto.reference.ReferentialDtoReferenceAware;
import fr.ird.observe.dto.referential.ReferentialDto;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.nuiton.validator.xwork2.field.NuitonFieldValidatorSupport;

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

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

/**
 * Ask a comment if some of referential used require one (see {@link ReferentialDto#isNeedComment()}.
 * 
 * Created by tchemit on 18/10/2018.
 *
 * @author Tony Chemit - [email protected]
 */
public class CommentNeededDtoValidator extends NuitonFieldValidatorSupport {

    private static final Logger log = LogManager.getLogger(CommentNeededDtoValidator.class);

    private Set propertyNames;
    private String bean;

    public void setPropertyNames(String propertyNames) {
        this.propertyNames = ImmutableSet.copyOf(Objects.requireNonNull(propertyNames).split(","));
    }

    public void setBean(String bean) {
        this.bean = bean;
    }

    @Override
    protected void validateWhenNotSkip(Object object) throws ValidationException {
        String fieldName = Objects.requireNonNull(getFieldName());
        String commentValue = (String) getFieldValue(fieldName, object);
        if (commentValue != null && commentValue.length() > 0) {
            return;
        }
        Object bean = object;
        if (this.bean != null) {
            bean = getFieldValue(this.bean, object);
            if (bean == null) {
                return;
            }
        }
        boolean withMessage = getDefaultMessage() != null;
        for (String propertyName : propertyNames) {
            Object fieldValue = getFieldValue(propertyName, bean);
            if (fieldValue instanceof Collection) {
//                setDefaultMessage("");
                boolean needComment = false;
                for (Object o : (Collection) fieldValue) {
                    needComment = validateOne((ReferentialDtoReferenceAware) o);
                    if (needComment) {
                        break;
                    }
                }
                if (needComment) {
                    addError(fieldName, bean, n("observe.validation.comment.needed.for.multiple"), propertyName, withMessage);
                }
            } else {
                boolean needComment = validateOne((ReferentialDtoReferenceAware) fieldValue);
                if (needComment) {
                    addError(fieldName, bean, n("observe.validation.comment.needed.for.single"), propertyName, withMessage);
                }
            }
        }
    }

    private boolean validateOne(ReferentialDtoReferenceAware fieldValue) {
        return fieldValue != null && fieldValue.isNeedComment();
    }

    private void addError(String fieldName, Object object, String messageKey, String propertyName, boolean withMessage) {

        if (withMessage) {
            addFieldError(fieldName, object);
            return;
        }
        String propertyLabel = t(I18nDecoratorHelper.getPropertyI18nKey(object.getClass(), propertyName));
        setDefaultMessage(messageKey + "##" + propertyLabel);
        log.info(String.format("[%s] Need a comment (%s).", fieldName, propertyLabel));
        try {
            addFieldError(fieldName, object);
        } finally {
            setDefaultMessage(null);
        }
    }

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