/**
 * $Id: $
 * $Date: $
 *
 */

package org.xmlsh.internal.commands;

import java.io.PrintWriter;
import java.util.List;
import javax.xml.namespace.QName;
import javax.xml.stream.Location;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamReader;
import org.xmlsh.core.Options;
import org.xmlsh.core.XCommand;
import org.xmlsh.core.XValue;
import org.xmlsh.sh.shell.SerializeOpts;
import org.xmlsh.util.Util;

public class xbase extends XCommand {

  private static QName mBaseQName = new QName(
      "http://www.w3.org/XML/1998/namespace", "base", "xml");

  @Override
  public int run(List<XValue> args)
      throws Exception {

    Options opts = new Options(SerializeOpts.getOptionDefs());
    opts.parse(args);
    args = opts.getRemainingArgs();

    SerializeOpts sopts = getSerializeOpts(opts);

    XMLStreamReader reader = args.isEmpty()
        ? getStdin().asXMLStreamReader(sopts)
        : getInput(args.get(0)).asXMLStreamReader(sopts);

    do {

      if(reader.getEventType() == XMLStreamConstants.START_ELEMENT)
        break;
      reader.next();

    } while(reader.hasNext());

    Location loc = reader.getLocation();
    String sSystemID = loc.getSystemId();
    String sBase = reader.getAttributeValue(mBaseQName.getNamespaceURI(),
        mBaseQName.getLocalPart());
    if(Util.isEmpty(sBase))
      sBase = sSystemID;

    reader.close();

    PrintWriter out = getStdout().asPrintWriter(sopts);

    out.println(sBase);

    out.flush();

    return 0;

  }

}

//
//
// Copyright (C) 2008-2014 David A. Lee.
//
// The contents of this file are subject to the "Simplified BSD License" (the
// "License");
// you may not use this file except in compliance with the License. You may
// obtain a copy of the
// License at http://www.opensource.org/licenses/bsd-license.php
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations
// under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is David A. Lee
//
// Portions created by (your name) are Copyright (C) (your legal entity). All
// Rights Reserved.
//
// Contributor(s): none.
//