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

Introduction

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

Source

/*
 * 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 org.apache.commons.lang3.StringUtils;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;

// @formatter:off
/*
    
example config:
    
{"attribute_detail_list":[
{
    "name": "tags",
    "is_required": false,
    "extractor_type": "FirstElementAttrListValue",
    "extractor_args": ["head > meta[name=keywords]", "content"],
    "default_value": ""
},
]}
    
*/
// @formatter:on

public class FirstElementAttrListValueDynamicExtractor extends DynamicExtractor {

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

        String attrib_value = null;

        if ((attributeDetail.extractor_args != null) && (attributeDetail.extractor_args.size() >= 2)) {
            String cssSelector = attributeDetail.extractor_args.get(0);
            Element element = articleDoc.select(cssSelector).first();
            if (StringUtils.isNotBlank(cssSelector)) {
                int arg_count = 0;
                for (String value_name : attributeDetail.extractor_args) {
                    if (arg_count > 0) { // skip the first one, its the cssSelector
                        if (element != null && element.attr(value_name) != null) {
                            String rawList = element.attr(value_name);
                            if (StringUtils.isNotBlank(rawList)) {
                                String[] parts = rawList.split(",");
                                for (int i = 0; i < parts.length; i++) {
                                    parts[i] = parts[i].trim().toLowerCase();
                                }
                                attrib_value = StringUtils.join(parts, ',');
                                break;
                            }
                        }
                    }
                    arg_count++;
                }
            }
        }

        return attrib_value;
    }

}