001/*
002 *  Copyright 2020 Anyware Services
003 *
004 *  Licensed under the Apache License, Version 2.0 (the "License");
005 *  you may not use this file except in compliance with the License.
006 *  You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 *  Unless required by applicable law or agreed to in writing, software
011 *  distributed under the License is distributed on an "AS IS" BASIS,
012 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 *  See the License for the specific language governing permissions and
014 *  limitations under the License.
015 */
016package org.ametys.plugins.contentio.archive;
017
018import java.time.LocalDate;
019import java.time.LocalDateTime;
020import java.time.format.DateTimeFormatter;
021import java.util.Date;
022import java.util.Optional;
023import java.util.stream.IntStream;
024
025import javax.xml.transform.TransformerException;
026
027import org.apache.commons.lang3.StringUtils;
028import org.apache.xpath.XPathAPI;
029import org.apache.xpath.objects.XObject;
030import org.w3c.dom.Node;
031import org.w3c.dom.NodeList;
032
033import org.ametys.core.util.DateUtils;
034
035final class DomNodeHelper
036{
037    private DomNodeHelper()
038    {  }
039    
040    static String nullableStringValue(Node node, String xpath) throws TransformerException
041    {
042        XObject xObject = XPathAPI.eval(node, xpath);
043        return xObject.getType() == XObject.CLASS_NULL ? null : xObject.str();
044    }
045    
046    private static Optional<String> _nonEmptyValue(Node node, String xpath) throws TransformerException
047    {
048        XObject xObject = XPathAPI.eval(node, xpath);
049        return Optional.of(xObject)
050                .filter(o -> XObject.CLASS_NULL != o.getType())
051                .map(XObject::str)
052                .filter(StringUtils::isNotBlank);
053    }
054    
055    static Date nullableDateValue(Node node, String xpath) throws TransformerException
056    {
057        return _nonEmptyValue(node, xpath)
058                .map(dateStr -> DateTimeFormatter.ISO_LOCAL_DATE.parse(dateStr, LocalDate::from))
059                .map(DateUtils::asDate)
060                .orElse(null);
061    }
062    
063    static Date nullableDatetimeValue(Node node, String xpath) throws TransformerException
064    {
065        return _nonEmptyValue(node, xpath)
066                .map(dateStr -> DateUtils.getISODateTimeFormatter().parse(dateStr, LocalDateTime::from))
067                .map(DateUtils::asDate)
068                .orElse(null);
069    }
070    
071    static String[] stringValues(Node node, String xpath) throws TransformerException
072    {
073        NodeList nodeList = XPathAPI.selectNodeList(node, xpath);
074        return IntStream.range(0, nodeList.getLength())
075                .mapToObj(nodeList::item)
076                .map(Node::getTextContent)
077                .toArray(String[]::new);
078    }
079}