/*
 * Copyright (c) 2019, The Regents of the University of California
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package edu.berkeley.cs.jqf.examples.xml;

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.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.StringWriter;

import org.w3c.dom.Document;

/**
 * @author Rohan Padhye
 */
public class XMLDocumentUtils {
    private static TransformerFactory transformerFactory =
            TransformerFactory.newInstance();

    public static String documentToString(Document document) {
        try {
            Transformer transformer = transformerFactory.newTransformer();
            StringWriter stream = new StringWriter();
            transformer.transform(new DOMSource(document), new StreamResult(stream));
            return stream.toString();
        } catch (TransformerException e) {
            throw new RuntimeException(e);
        }
    }

    public static InputStream documentToInputStream(Document document) {
        try {
            Transformer transformer = transformerFactory.newTransformer();
            ByteArrayOutputStream stream = new ByteArrayOutputStream();
            transformer.transform(new DOMSource(document), new StreamResult(stream));
            return new ByteArrayInputStream(stream.toByteArray());
        } catch (TransformerException e) {
            throw new RuntimeException(e);
        }
    }
}
