/
HtmlJsonLDReader.java
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/
HtmlJsonLDReader.java
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/**
* Copyright 2021 Martynas Jusevičius <martynas@atomgraph.com>
*
* 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 com.atomgraph.linkeddatahub.io;
import static com.atomgraph.linkeddatahub.io.JsonLDReader.JSONLD_OPTIONS;
import com.github.jsonldjava.core.JsonLdOptions;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringReader;
import org.apache.jena.atlas.web.ContentType;
import org.apache.jena.riot.Lang;
import static org.apache.jena.riot.Lang.JSONLD;
import org.apache.jena.riot.RDFLanguages;
import org.apache.jena.riot.ReaderRIOTBase;
import org.apache.jena.riot.RiotParseException;
import org.apache.jena.riot.system.StreamRDF;
import org.apache.jena.sparql.util.Context;
import org.apache.jena.util.FileUtils;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.parser.Parser;
import org.jsoup.select.Elements;
/**
* JSON-LD-in-HTML reader.
* Can be used to read schema.org data.
*
* @author {@literal Martynas Jusevičius <martynas@atomgraph.com>}
*/
public class HtmlJsonLDReader extends ReaderRIOTBase
{
private final JsonLDReader jsonLDReader;
private final JsonLdOptions options;
public HtmlJsonLDReader(JsonLDReader jsonLDReader)
{
this(jsonLDReader, null);
}
public HtmlJsonLDReader(JsonLDReader jsonLDReader, JsonLdOptions options)
{
this.jsonLDReader = jsonLDReader;
this.options = options;
}
@Override
public void read(InputStream in, String baseURI, Lang lang, StreamRDF output, Context context)
{
read(FileUtils.asBufferedUTF8(in), baseURI, lang, output, context);
}
@Override
public void read(Reader in, String baseURI, ContentType ct, StreamRDF output, Context context)
{
read(in, baseURI, RDFLanguages.contentTypeToLang(ct), output, context);
}
public void read(Reader in, String baseURI, Lang lang, StreamRDF output, Context context)
{
Document html = Parser.htmlParser().parseInput(in, baseURI);
Elements jsonLdElements = html.selectXpath("/html//script[@type = 'application/ld+json']");
if (jsonLdElements.isEmpty()) throw new RiotParseException("<script> element with type=\"application/ld+json\" not found", -1, -1);
context.set(JSONLD_OPTIONS, getJsonLdOptions());
// read from all <script type="application/ld+json"> elements
for (Element element : jsonLdElements)
{
String jsonLd = element.data();
getJsonLDReader().read(new StringReader(jsonLd), baseURI, JSONLD.getContentType(), output, context);
}
}
public JsonLDReader getJsonLDReader()
{
return jsonLDReader;
}
public JsonLdOptions getJsonLdOptions()
{
return options;
}
}