io.seldon.importer.articles.dynamicextractors.FirstElementAttrValueDateWithFormatDynamicExtractor.java Source code

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Here is the source code for io.seldon.importer.articles.dynamicextractors.FirstElementAttrValueDateWithFormatDynamicExtractor.java

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/*
 * Seldon -- open source prediction engine
 * =======================================
 * Copyright 2011-2015 Seldon Technologies Ltd and Rummble Ltd (http://www.seldon.io/)
 *
 **********************************************************************************************
 *
 * 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 io.seldon.importer.articles.dynamicextractors;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

import org.apache.commons.lang3.StringUtils;
import org.apache.log4j.Logger;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;

//@formatter:off
/*
    
example config:
    
{"attribute_detail_list":[
{
    "name": "published_date",
    "is_required": false,
    "extractor_type": "FirstElementAttrValueDateWithFormat",
    "extractor_args": ["meta[name=Created-date]", "yyyy-MM-dd'T'HH:mm:ss", "content"],
    "default_value": ""
}   
]}
    
*/
//@formatter:on

public class FirstElementAttrValueDateWithFormatDynamicExtractor extends DynamicExtractor {

    private static Logger logger = Logger
            .getLogger(FirstElementAttrValueDateWithFormatDynamicExtractor.class.getName());

    @Override
    public String extract(AttributeDetail attributeDetail, String url, Document articleDoc) throws Exception {

        String attrib_value = null;
        String dateFormatString = null;

        if ((attributeDetail.extractor_args != null) && (attributeDetail.extractor_args.size() >= 3)) {
            String cssSelector = attributeDetail.extractor_args.get(0);
            dateFormatString = attributeDetail.extractor_args.get(1);
            Element element = articleDoc.select(cssSelector).first();
            if (StringUtils.isNotBlank(cssSelector)) {
                int arg_count = 0;
                for (String value_name : attributeDetail.extractor_args) {
                    if (arg_count > 1) { // skip the first one, its the cssSelector, and second thats the Date format
                        if (element != null && element.attr(value_name) != null) {
                            attrib_value = element.attr(value_name);
                            if (StringUtils.isNotBlank(attrib_value)) {
                                break;
                            }
                        }
                    }
                    arg_count++;
                }
            }
        }

        if ((attrib_value != null) && (dateFormatString != null)) {
            String pubtext = attrib_value;
            SimpleDateFormat dateFormatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            DateFormat df = new SimpleDateFormat(dateFormatString, Locale.ENGLISH);
            Date result = null;
            try {
                result = df.parse(pubtext);
            } catch (ParseException e) {
                logger.info("Failed to parse date with format [" + dateFormatString + "] " + pubtext);
            }

            if (result != null) {
                String attrib_value_orig = attrib_value;
                attrib_value = dateFormatter.format(result);
                String msg = "Extracted date [" + attrib_value_orig + "] - > [" + attrib_value + "]";
                logger.info(msg);
            } else {
                logger.error("Failed to parse date " + pubtext);
                attrib_value = null;
            }
        }

        return attrib_value;
    }

}