jscl.editor.PDF Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of meditor Show documentation
java symbolic computing library and mathematical editor
The newest version!
package jscl.editor;

import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.io.ByteArrayOutputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Map;
import java.util.HashMap;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXResult;
import javax.xml.transform.stream.StreamSource;
import net.sourceforge.jeuclid.fop.plugin.JEuclidFopFactoryConfigurator;
import org.apache.fop.apps.Fop;
import org.apache.fop.apps.FopFactory;
import org.apache.fop.apps.FopFactoryBuilder;
import org.apache.fop.apps.MimeConstants;
import org.apache.fop.apps.FOPException;

public class PDF extends Content {
	private static final Map cache = new HashMap<>();
	private final Transformer transformer;

	private PDF(final String stylesheet) throws TransformerConfigurationException {
		transformer = TransformerFactory.newInstance().newTransformer(new StreamSource(getClass().getResource(stylesheet).toString()));
	}

	public static PDF instance(final String stylesheet) {
		if (!cache.containsKey(stylesheet)) try {
			cache.put(stylesheet, new PDF(stylesheet));
		} catch (final TransformerConfigurationException e) {
			e.printStackTrace();
		}
		return cache.get(stylesheet);
	}

	public byte[] exportToPDF(final Reader reader) throws IOException {
		final ByteArrayOutputStream out = new ByteArrayOutputStream();
		try {
			final FopFactoryBuilder builder = new FopFactoryBuilder(new URI("http://meditorworld.appspot.com/"));
			final FopFactory factory = builder.build();
			JEuclidFopFactoryConfigurator.configure(factory);
			final Fop fop = factory.newFop(MimeConstants.MIME_PDF, out);
			transformer.transform(new StreamSource(new StringReader(apply(reader))), new SAXResult(fop.getDefaultHandler()));
		} catch (final URISyntaxException e) {
			e.printStackTrace();
		} catch (final FOPException e) {
			e.printStackTrace();
		} catch (final TransformerException e) {
			e.printStackTrace();
		}
		return out.toByteArray();
	}
}