ElementEmitter.java

/*
 * Copyright (C) 2003-2009 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.chromattic.common.xml;

import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
 * @version $Revision$
 */
public class ElementEmitter extends XMLEmitter {

  /** . */
  private static final AttributesImpl EMPTY = new AttributesImpl();

  /** . */
  private final String qName;

  /** . */
  private AttributesImpl attrs;

  /** . */
  private Map<String, String> namespaces;

  public ElementEmitter(Handler handler, String qName) {
    super(handler);

    //
    this.qName = qName;
    this.attrs = EMPTY;
  }


  @Override
  protected void emmitBeginning() throws SAXException {
    handler.content.startElement("", "", qName, attrs);
  }

  @Override
  protected void emmitEnd() throws SAXException {
    if (namespaces != null) {
      for (String prefix : namespaces.keySet()) {
        handler.content.endPrefixMapping(prefix);
      }
    }

    //
    handler.content.endElement("", "", qName);
  }

  public ElementEmitter element(String qName) throws SAXException {
    if (qName == null) {
      throw new NullPointerException();
    }
    ElementEmitter child = new ElementEmitter(handler, qName);
    emitChild(child);
    return child;
  }

  public void content(String data) throws SAXException {
    emitChild(null);
    handler.content.characters(data.toCharArray(), 0, data.length());
  }

  public void withNamespace(String prefix, String uri) throws SAXException {
    if (namespaces == null) {
      namespaces = new HashMap<String, String>();
    }
    if (namespaces.containsKey(prefix)) {
      throw new IllegalStateException("Prefix " + prefix + " already bound to " + uri);
    }
    namespaces.put(prefix, uri);
    handler.content.startPrefixMapping(prefix, uri);
  }

  public ElementEmitter withAttribute(String qName, String value) {
    checkInitial();
    if (qName == null) {
      throw new NullPointerException();
    }
    if (value == null) {
      throw new NullPointerException();
    }
    if (attrs == EMPTY) {
      attrs = new AttributesImpl();
    }
    attrs.addAttribute("", "", qName, "", value);
    return this;
  }


}