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Liferay Dynamic Data Mapping Service

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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library 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 Lesser General Public License for more
 * details.
 */

package com.liferay.dynamic.data.mapping.util.impl;

import com.liferay.dynamic.data.mapping.model.Value;
import com.liferay.dynamic.data.mapping.storage.DDMFormFieldValue;
import com.liferay.dynamic.data.mapping.storage.DDMFormValues;
import com.liferay.dynamic.data.mapping.util.DDMFormValuesMerger;

import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

import org.osgi.service.component.annotations.Component;

/**
 * @author Inácio Nery
 */
@Component(immediate = true)
public class DDMFormValuesMergerImpl implements DDMFormValuesMerger {

	@Override
	public DDMFormValues merge(
		DDMFormValues newDDMFormValues, DDMFormValues existingDDMFormValues) {

		List mergedDDMFormFieldValues =
			mergeDDMFormFieldValues(
				newDDMFormValues.getDDMFormFieldValues(),
				existingDDMFormValues.getDDMFormFieldValues());

		existingDDMFormValues.setDDMFormFieldValues(mergedDDMFormFieldValues);

		return existingDDMFormValues;
	}

	protected DDMFormFieldValue getDDMFormFieldValueByName(
		List ddmFormFieldValues, String name) {

		for (DDMFormFieldValue ddmFormFieldValue : ddmFormFieldValues) {
			if (name.equals(ddmFormFieldValue.getName())) {
				return ddmFormFieldValue;
			}
		}

		return null;
	}

	protected List mergeDDMFormFieldValues(
		List newDDMFormFieldValues,
		List existingDDMFormFieldValues) {

		List mergedDDMFormFieldValues = new ArrayList<>(
			existingDDMFormFieldValues);

		for (DDMFormFieldValue newDDMFormFieldValue : newDDMFormFieldValues) {
			DDMFormFieldValue actualDDMFormFieldValue =
				getDDMFormFieldValueByName(
					existingDDMFormFieldValues, newDDMFormFieldValue.getName());

			if (actualDDMFormFieldValue != null) {
				mergeValue(
					newDDMFormFieldValue.getValue(),
					actualDDMFormFieldValue.getValue());

				List mergedNestedDDMFormFieldValues =
					mergeDDMFormFieldValues(
						newDDMFormFieldValue.getNestedDDMFormFieldValues(),
						actualDDMFormFieldValue.getNestedDDMFormFieldValues());

				newDDMFormFieldValue.setNestedDDMFormFields(
					mergedNestedDDMFormFieldValues);

				mergedDDMFormFieldValues.remove(actualDDMFormFieldValue);
			}

			mergedDDMFormFieldValues.add(newDDMFormFieldValue);
		}

		return mergedDDMFormFieldValues;
	}

	protected void mergeValue(Value newValue, Value existingValue) {
		if (existingValue == null) {
			return;
		}

		for (Locale locale : existingValue.getAvailableLocales()) {
			String value = newValue.getString(locale);

			if (value == null) {
				newValue.addString(locale, existingValue.getString(locale));
			}
		}
	}

}