/*
 * @(#)DOMElementImpl.java   1.11 2000/08/16
 *
 */

package org.w3c.tidy;

import org.w3c.dom.DOMException;

/**
 *
 * DOMElementImpl
 *
 * (c) 1998-2000 (W3C) MIT, INRIA, Keio University
 * See Tidy.java for the copyright notice.
 * Derived from <a href="http://www.w3.org/People/Raggett/tidy">
 * HTML Tidy Release 4 Aug 2000</a>
 *
 * @author  Dave Raggett <dsr@w3.org>
 * @author  Andy Quick <ac.quick@sympatico.ca> (translation to Java)
 * @version 1.4, 1999/09/04 DOM Support
 * @version 1.5, 1999/10/23 Tidy Release 27 Sep 1999
 * @version 1.6, 1999/11/01 Tidy Release 22 Oct 1999
 * @version 1.7, 1999/12/06 Tidy Release 30 Nov 1999
 * @version 1.8, 2000/01/22 Tidy Release 13 Jan 2000
 * @version 1.9, 2000/06/03 Tidy Release 30 Apr 2000
 * @version 1.10, 2000/07/22 Tidy Release 8 Jul 2000
 * @version 1.11, 2000/08/16 Tidy Release 4 Aug 2000
 */

public class DOMElementImpl extends DOMNodeImpl
                            implements org.w3c.dom.Element {

    protected DOMElementImpl(Node adaptee)
    {
        super(adaptee);
    }


    /* --------------------- DOM ---------------------------- */

    /**
     * @see org.w3c.dom.Node#getNodeType
     */
    public short getNodeType()
    {
        return org.w3c.dom.Node.ELEMENT_NODE;
    }

    /**
     * @see org.w3c.dom.Element#getTagName
     */
    public String             getTagName()
    {
        return super.getNodeName();
    }

    /**
     * @see org.w3c.dom.Element#getAttribute
     */
    public String             getAttribute(String name)
    {
        if (this.adaptee == null)
            return null;

        AttVal att = this.adaptee.attributes;
        while (att != null) {
            if (att.attribute.equals(name)) break;
            att = att.next;
        }
        if (att != null)
            return att.value;
        else
            return "";
    }

    /**
     * @see org.w3c.dom.Element#setAttribute
     */
    public void               setAttribute(String name, 
                                           String value)
                                           throws DOMException
    {
        if (this.adaptee == null)
            return;

        AttVal att = this.adaptee.attributes;
        while (att != null) {
            if (att.attribute.equals(name)) break;
            att = att.next;
        }
        if (att != null) {
            att.value = value;
        } else {
            att = new AttVal(null, null, (int)'"', name, value);
            att.dict =
              AttributeTable.getDefaultAttributeTable().findAttribute(att);
            if (this.adaptee.attributes == null) {
                this.adaptee.attributes = att;
            } else {
                att.next = this.adaptee.attributes;
                this.adaptee.attributes = att;
            }
        }
    }

    /**
     * @see org.w3c.dom.Element#removeAttribute
     */
    public void               removeAttribute(String name)
                                              throws DOMException
    {
        if (this.adaptee == null)
            return;

        AttVal att = this.adaptee.attributes;
        AttVal pre = null;
        while (att != null) {
            if (att.attribute.equals(name)) break;
            pre = att;
            att = att.next;
        }
        if (att != null) {
            if (pre == null) {
                this.adaptee.attributes = att.next;
            } else {
                pre.next = att.next;
            }
        }
    }

    /**
     * @see org.w3c.dom.Element#getAttributeNode
     */
    public org.w3c.dom.Attr   getAttributeNode(String name)
    {
        if (this.adaptee == null)
            return null;

        AttVal att = this.adaptee.attributes;
        while (att != null) {
            if (att.attribute.equals(name)) break;
            att = att.next;
        }
        if (att != null)
            return att.getAdapter();
        else
            return null;
    }

    /**
     * @see org.w3c.dom.Element#setAttributeNode
     */
    public org.w3c.dom.Attr   setAttributeNode(org.w3c.dom.Attr newAttr)
                                               throws DOMException
    {
        if (newAttr == null)
            return null;
        if (!(newAttr instanceof DOMAttrImpl)) {
            throw new DOMExceptionImpl(DOMException.WRONG_DOCUMENT_ERR,
                                       "newAttr not instanceof DOMAttrImpl");
        }

        DOMAttrImpl newatt = (DOMAttrImpl)newAttr;
        String name = newatt.avAdaptee.attribute;
        org.w3c.dom.Attr result = null;

        AttVal att = this.adaptee.attributes;
        while (att != null) {
            if (att.attribute.equals(name)) break;
            att = att.next;
        }
        if (att != null) {
            result = att.getAdapter();
            att.adapter = newAttr;
        } else {
            if (this.adaptee.attributes == null) {
                this.adaptee.attributes = newatt.avAdaptee;
            } else {
                newatt.avAdaptee.next = this.adaptee.attributes;
                this.adaptee.attributes = newatt.avAdaptee;
            }
        }
        return result;
    }

    /**
     * @see org.w3c.dom.Element#removeAttributeNode
     */
    public org.w3c.dom.Attr   removeAttributeNode(org.w3c.dom.Attr oldAttr)
                                                  throws DOMException
    {
        if (oldAttr == null)
            return null;

        org.w3c.dom.Attr result = null;
        AttVal att = this.adaptee.attributes;
        AttVal pre = null;
        while (att != null) {
            if (att.getAdapter() == oldAttr) break;
            pre = att;
            att = att.next;
        }
        if (att != null) {
            if (pre == null) {
                this.adaptee.attributes = att.next;
            } else {
                pre.next = att.next;
            }
            result = oldAttr;
        } else {
            throw new DOMExceptionImpl(DOMException.NOT_FOUND_ERR,
                                       "oldAttr not found");
        }
        return result;
    }

    /**
     * @see org.w3c.dom.Element#getElementsByTagName
     */
    public org.w3c.dom.NodeList getElementsByTagName(String name)
    {
        return new DOMNodeListByTagNameImpl(this.adaptee, name);
    }

    /**
     * @see org.w3c.dom.Element#normalize
     */
    public void               normalize()
    {
        // NOT SUPPORTED
    }

    /**
     * DOM2 - not implemented.
     */
    public String getAttributeNS(String namespaceURI, String localName)
    {
	return null;
    }

    /**
     * DOM2 - not implemented.
     * @exception   org.w3c.dom.DOMException
     */
    public void setAttributeNS(String namespaceURI,
                               String qualifiedName,
                               String value)
        throws org.w3c.dom.DOMException
    {
    }

    /**
     * DOM2 - not implemented.
     * @exception   org.w3c.dom.DOMException
     */
    public void removeAttributeNS(String namespaceURI, String localName)
        throws org.w3c.dom.DOMException
    {
    }

    /**
     * DOM2 - not implemented.
     */
    public org.w3c.dom.Attr getAttributeNodeNS(String namespaceURI,
                                               String localName)
    {
	return null;
    }

    /**
     * DOM2 - not implemented.
     * @exception   org.w3c.dom.DOMException
     */
    public org.w3c.dom.Attr setAttributeNodeNS(org.w3c.dom.Attr newAttr)
        throws org.w3c.dom.DOMException
    {
	return null;
    }

    /**
     * DOM2 - not implemented.
     */
    public org.w3c.dom.NodeList getElementsByTagNameNS(String namespaceURI,
                                                       String localName)
    {
	return null;
    }

    /**
     * DOM2 - not implemented.
     */
    public boolean hasAttribute(String name)
    {
        return false;
    }

    /**
     * DOM2 - not implemented.
     */
    public boolean hasAttributeNS(String namespaceURI, 
                                  String localName)
    {
        return false;
    }

}