uk.ac.ncl.intbio.examples.WriteJsonFromDataTree Maven / Gradle / Ivy

package uk.ac.ncl.intbio.examples;

import java.io.*;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import javax.json.*;
import javax.json.stream.JsonGenerator;
import javax.xml.namespace.QName;

import uk.ac.ncl.intbio.core.datatree.DocumentRoot;
import uk.ac.ncl.intbio.core.io.IoReader;
import uk.ac.ncl.intbio.core.io.json.JsonIo;
import uk.ac.ncl.intbio.core.io.json.StringifyQName;

/**
 * Provides an example for importing and exporting {@link DocumentRoot} objects using the JSON format.
 * In the example a {@link DocumentRoot} including SBOL2.0 objects (with data for Module, Interaction, Participation, ComponentInstantiation and Model objects from the SBOL2.0 proposed data model)
 * is initially written to the console and also to an in-memory {@link String}, which is then read into another {@link DocumentRoot}.
 */
public class WriteJsonFromDataTree
{

	public static void main(String[] args) throws Exception
	{
		DocumentRoot originalDocument = DataTreeCreator.makeSBOL2Document();
		StringWriter writer = new StringWriter();
		write(writer, originalDocument);

		System.out.println(writer.getBuffer().toString());
		System.out.println("-----------------------------------------");

		DocumentRoot readQNameDocument = read(new StringReader(writer.getBuffer().toString()));
		System.out.println(readQNameDocument);
		System.out.println("-----------------------------------------");
		write(new OutputStreamWriter(System.out), readQNameDocument);
	}

	private static void write(Writer stream, DocumentRoot document) throws Exception
	{
		Map config = new HashMap<>();
		config.put(JsonGenerator.PRETTY_PRINTING, true);
		JsonGenerator writer = Json.createGeneratorFactory(config).createGenerator(stream);
		JsonIo jsonIo = new JsonIo();
		jsonIo.createIoWriter(writer).write(StringifyQName.qname2string.mapDR(document));
		writer.flush();
		writer.close();
	}

	private static DocumentRoot read(Reader stream) throws Exception
	{
		JsonReader reader = Json.createReaderFactory(Collections. emptyMap()).createReader(stream);
		JsonIo jsonIo = new JsonIo();
		IoReader ioReader = jsonIo.createIoReader(reader.read());
		DocumentRoot root = ioReader.read();
		return StringifyQName.string2qname.mapDR(root);
	}
}