jscl.mathml.MathML Maven / Gradle / Ivy

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package jscl.mathml;

import org.apache.xerces.dom.CoreDocumentImpl;
import org.apache.xerces.dom.DocumentTypeImpl;
import org.apache.xerces.dom.ElementImpl;
import org.apache.xerces.dom.TextImpl;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.ByteArrayOutputStream;

public class MathML {
	static Transformer xhtml;
	Node node;

	MathML(Node node) {
		this.node = node;
	}

	public Document document() {
		return node instanceof CoreDocumentImpl ? (Document) node : node.getOwnerDocument();
	}

	public MathML(String qualifiedName, String publicID, String systemID) {
		this(new CoreDocumentImpl());
		CoreDocumentImpl document = (CoreDocumentImpl) document();
		document.setXmlEncoding("utf-8");
		document.appendChild(new DocumentTypeImpl(document, qualifiedName, publicID, systemID));
	}

	public MathML element(String name) {
		CoreDocumentImpl document = (CoreDocumentImpl) document();
		return new MathML(new ElementImpl(document, name));
	}

	public void setAttribute(String name, String value) {
		((Element) node).setAttribute(name, value);
	}

	public MathML text(String data) {
		CoreDocumentImpl document = (CoreDocumentImpl) document();
		return new MathML(new TextImpl(document, data));
	}

	public void appendChild(MathML math) {
		node.appendChild(math.node);
	}

	public String toString() {
		ByteArrayOutputStream os = new ByteArrayOutputStream();
		try {
			transformer().transform(new DOMSource(node), new StreamResult(os));
		} catch (TransformerException e) {
		}
		String s = os.toString();
		return s.substring(s.indexOf(">") + 1);
	}

	static Transformer transformer() throws TransformerException {
		return xhtml == null ? xhtml = TransformerFactory.newInstance().newTransformer() : xhtml;
	}
}