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/*
 * The MIT License
 * Copyright (c) 2012 Microsoft Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package microsoft.exchange.webservices.data.security;

import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.validation.Schema;
import javax.xml.validation.Validator;
import javax.xml.validation.ValidatorHandler;

import java.io.InputStream;

/**
 * XmlSchema with protection against DTD parsing in read overloads
 */
public class SafeXmlSchema extends Schema {

  @Override
  public Validator newValidator() {
    // TODO Auto-generated method stub
    return null;
  }

  @Override
  public ValidatorHandler newValidatorHandler() {
    // TODO Auto-generated method stub
    return null;
  }

  /**
   * Reads an XML Schema from the supplied stream.
   *
   * @param stream The supplied data stream.
   * @return The XmlSchema object representing the XML Schema.
   * @throws javax.xml.stream.XMLStreamException
   */
  public static Schema read(final InputStream stream) throws XMLStreamException {
    final XMLInputFactory inputFactory = XMLInputFactory.newInstance();
    return (Schema) inputFactory.createXMLEventReader(stream);
  }

  /**
   * Reads an XML Schema from the supplied TextReader.
   *
   * @param reader The TextReader containing the XML Schema to read
   * @return The XmlSchema object representing the XML Schema.
   * @throws javax.xml.stream.XMLStreamException
   */

  public static Schema read(XMLStreamReader reader) throws XMLStreamException {
    final XMLInputFactory inputFactory = XMLInputFactory.newInstance();
    return (Schema) inputFactory.createXMLEventReader(reader);
  }

}