baseelement.java

Java的面向对象数据库系统的源代码

/*
 * Copyright 2001 (C) MetaStuff, Ltd. All Rights Reserved.
 *
 * This software is open source.
 * See the bottom of this file for the licence.
 *
 * $Id: BaseElement.java,v 1.3 2003/11/02 18:04:59 per_nyfelt Exp $
 */

package org.dom4j.tree;

import org.dom4j.*;

import java.util.List;

/** <p><code>BaseElement</code> is a useful base class for implemementation
  * inheritence of an XML element.</p>
  *
  * @author <a href="mailto:[e-mail]">James Strachan</a>
  * @version $Revision: 1.3 $
  */
public class BaseElement extends AbstractElement {

    /** The <code>QName</code> for this element */
    private QName qname;

    /** Stores the parent branch of this node which is either a Document
      * if this element is the root element in a document, or another Element
      * if it is a child of the root document, or null if it has not been added
      * to a document yet.
       */
    private Branch parentBranch;

    /** List of content nodes. */
    protected List content;

    /** list of attributes */
    protected List attributes;



    public BaseElement(String name) {
        this.qname = getNodeFactory().createQName(name);
    }

    public BaseElement(QName qname) {
        this.qname = qname;
    }

    public BaseElement(String name,Namespace namespace) {
        this.qname = getNodeFactory().createQName(name, namespace);
    }

    public Element getParent() {
        return ( parentBranch instanceof Element )
            ? (Element) parentBranch : null;
    }

    public void setParent(Element parent) {
        if ( parentBranch instanceof Element || parent != null ) {
            parentBranch = parent;
        }
    }

    public Document getDocument() {
        if ( parentBranch instanceof Document ) {
            return (Document) parentBranch;
        }
        else if ( parentBranch instanceof Element ) {
            Element parent = (Element) parentBranch;
            return parent.getDocument();
        }
        return null;
    }

    public void setDocument(Document document) {
        if ( parentBranch instanceof Document || document != null ) {
            parentBranch = document;
        }
    }

    public boolean supportsParent() {
        return true;
    }

    public QName getQName() {
        return qname;
    }

    public void setQName(QName qname) {
        this.qname = qname;
    }

    public void clearContent() {
        contentList().clear();
    }

    public void setContent(List content) {
        this.content = content;
        if ( content instanceof ContentListFacade ) {
            this.content = ((ContentListFacade) content).getBackingList();
        }
    }

    public void setAttributes(List attributes) {
        this.attributes = attributes;
        if ( attributes instanceof ContentListFacade ) {
            this.attributes = ((ContentListFacade) attributes).getBackingList();
        }
    }


    // Implementation methods
    //-------------------------------------------------------------------------

    protected List contentList() {
        if ( content == null ) {
            content = createContentList();
        }
        return content;
    }

    protected List attributeList() {
        if ( attributes == null ) {
            attributes = createAttributeList();
        }
        return attributes;
    }

    protected List attributeList(int size) {
        if ( attributes == null ) {
            attributes = createAttributeList(size);
        }
        return attributes;
    }

    protected void setAttributeList(List attributes) {
        this.attributes = attributes;
    }

}




/*
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright
 *    statements and notices.  Redistributions must also contain a
 *    copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions and the
 *    following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. The name "DOM4J" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of MetaStuff, Ltd.  For written permission,
 *    please contact [e-mail].
 *
 * 4. Products derived from this Software may not be called "DOM4J"
 *    nor may "DOM4J" appear in their names without prior written
 *    permission of MetaStuff, Ltd. DOM4J is a registered
 *    trademark of MetaStuff, Ltd.
 *
 * 5. Due credit should be given to the DOM4J Project
 *    (http://dom4j.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * METASTUFF, LTD. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 2001 (C) MetaStuff, Ltd. All Rights Reserved.
 *
 * $Id: BaseElement.java,v 1.3 2003/11/02 18:04:59 per_nyfelt Exp $
 */