code: /*
   * 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);
          }
      }
  }
  