/* DomText.java -- 
   Copyright (C) 1999, 2000, 2001, 2004 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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any later version.

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
conditions of the GNU General Public License cover the whole
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As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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this exception to your version of the library, but you are not
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exception statement from your version. */

package gnu.xml.dom;

import org.w3c.dom.DOMException;
import org.w3c.dom.Text;

/**
 * <p> "Text" implementation.  </p>
 *
 * @author David Brownell 
 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
 */
public class DomText
  extends DomCharacterData
  implements Text
{
  
  // NOTE:  deleted unused per-instance "isIgnorable"
  // support to reclaim its space.
  
  /**
   * Constructs a text node associated with the specified
   * document and holding the specified data.
   *
   * <p>This constructor should only be invoked by a Document object
   * as part of its createTextNode functionality, or through a subclass
   * which is similarly used in a "Sub-DOM" style layer. 
   */
  protected DomText(DomDocument owner, String value)
  {
    super(TEXT_NODE, owner, value);
  }

  protected DomText(DomDocument owner, char[] buf, int off, int len)
  {
    super(TEXT_NODE, owner, buf, off, len);
  }

  // Used by DomCDATA
  DomText(short nodeType, DomDocument owner, String value)
  {
    super(nodeType, owner, value);
  }

  DomText(short nodeType, DomDocument owner, char[] buf, int off, int len)
  {
    super(nodeType, owner, buf, off, len);
  }

  /**
   * <b>DOM L1</b>
   * Returns the string "#text".
   */
  // can't be 'final' with CDATA subclassing
  public String getNodeName()
  {
    return "#text";
  }

  /**
   * <b>DOM L1</b>
   * Splits this text node in two parts at the offset, returning
   * the new text node (the sibling with the second part).
   */
  public Text splitText(int offset)
  {
    if (isReadonly())
      {
        throw new DomDOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR);
      }
    try
      {
        String text = getNodeValue();
        String before = text.substring(0, offset);
        String after = text.substring(offset);
        Text next;
        
        if (getNodeType() == TEXT_NODE)
          {
            next = owner.createTextNode(after);
          }
        else // CDATA_SECTION_NODE
          {
            next = owner.createCDATASection(after);
          }
        
        if (this.next != null)
          {
            parent.insertBefore(next, this.next);
          }
        else
          {
            parent.appendChild(next);
          }
        setNodeValue(before);
        return next;
        
      }
    catch (IndexOutOfBoundsException x)
      {
        throw new DomDOMException(DOMException.INDEX_SIZE_ERR);
      }
  }
    
  // DOM Level 3
  
  public boolean isElementContentWhitespace()
  {
    if (parent != null)
      {
        DomDoctype doctype = (DomDoctype) owner.getDoctype();
        if (doctype != null)
          {
            DTDElementTypeInfo info =
              doctype.getElementTypeInfo(parent.getNodeName());
            if (info != null)
              {
                if (info.model == null && info.model.indexOf("#PCDATA") != -1)
                  {
                    return false;
                  }
                return getNodeValue().trim().length() == 0;
              }
          }
      }
    return false;
  }

  public String getWholeText()
  {
    DomNode ref = this;
    DomNode ctx;
    for (ctx = previous; ctx != null &&
         (ctx.nodeType == TEXT_NODE || ctx.nodeType == CDATA_SECTION_NODE);
         ctx = ctx.previous)
      {
        ref = ctx;
      }
    StringBuffer buf = new StringBuffer(ref.getNodeValue());
    for (ctx = ref.next; ctx != null &&
         (ctx.nodeType == TEXT_NODE || ctx.nodeType == CDATA_SECTION_NODE);
         ctx = ctx.next)
      {
        buf.append(ctx.getNodeValue());
      }
    return buf.toString ();
  }

  public Text replaceWholeText(String content)
    throws DOMException
  {
    boolean isEmpty = (content == null || content.length () == 0);
    if (!isEmpty)
      {
        setNodeValue(content);
      }
    
    DomNode ref = this;
    DomNode ctx;
    for (ctx = previous; ctx != null &&
         (ctx.nodeType == TEXT_NODE || ctx.nodeType == CDATA_SECTION_NODE);
         ctx = ctx.previous)
      {
        ref = ctx;
      }
    ctx = ref.next;
    if ((isEmpty || ref != this) && parent != null)
      {
        parent.removeChild(ref);
      }
    for (; ctx != null &&
         (ctx.nodeType == TEXT_NODE || ctx.nodeType == CDATA_SECTION_NODE);
         ctx = ref)
      {
        ref = ctx.next;
        if ((isEmpty || ctx != this) && parent != null)
          {
            parent.removeChild(ctx);
          }
      }
    return (isEmpty) ? null : this;
  }
    
}