defaultelement.java

Java的面向对象数据库系统的源代码

        return new ContentListFacade(this, attributeList());
    }

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

    public Iterator attributeIterator() {
        if (attributes instanceof List) {
            List list = (List) attributes;
            return list.iterator();
        } else if (attributes != null) {
            return createSingleIterator(attributes);

        } else {

            return EMPTY_ITERATOR;

        }

    }

    public Attribute attribute(int index) {

        if (attributes instanceof List) {

            List list = (List) attributes;

            return (Attribute) list.get(index);

        } else if (attributes != null && index == 0) {

            return (Attribute) attributes;

        } else {

            return null;

        }

    }

    public int attributeCount() {

        if (attributes instanceof List) {

            List list = (List) attributes;

            return list.size();

        } else {

            return (attributes != null) ? 1 : 0;

        }

    }

    public Attribute attribute(String name) {

        if (attributes instanceof List) {

            List list = (List) attributes;

            int size = list.size();

            for (int i = 0; i < size; i++) {

                Attribute attribute = (Attribute) list.get(i);

                if (name.equals(attribute.getName())) {

                    return attribute;

                }

            }

        } else if (attributes != null) {

            Attribute attribute = (Attribute) attributes;

            if (name.equals(attribute.getName())) {

                return attribute;

            }

        }

        return null;

    }

    public Attribute attribute(QName qName) {

        if (attributes instanceof List) {

            List list = (List) attributes;

            int size = list.size();

            for (int i = 0; i < size; i++) {

                Attribute attribute = (Attribute) list.get(i);

                if (qName.equals(attribute.getQName())) {

                    return attribute;

                }

            }

        } else if (attributes != null) {

            Attribute attribute = (Attribute) attributes;

            if (qName.equals(attribute.getQName())) {

                return attribute;

            }

        }

        return null;

    }

    public Attribute attribute(String name, Namespace namespace) {

        return attribute(getNodeFactory().createQName(name, namespace));

    }

    public void add(Attribute attribute) {
        if (attribute.getParent() != null) {
            String message =
                    "The Attribute already has an existing parent \""
                    + attribute.getParent().getQualifiedName()
                    + "\"";
            throw new IllegalAddException(this, attribute, message);
        }
        if (attribute.getValue() == null) {
            // try remove a previous attribute with the same
            // name since adding an attribute with a null value
            // is equivalent to removing it.
            Attribute oldAttribute = attribute(attribute.getQName());
            if (oldAttribute != null) {
                remove(oldAttribute);
            }
        } else {
            if (attributes == null) {
                attributes = attribute;
            } else {
                attributeList().add(attribute);
            }
            childAdded(attribute);
        }
    }

    public boolean remove(Attribute attribute) {
        boolean answer = false;
        if (attributes instanceof List) {
            List list = (List) attributes;
            answer = list.remove(attribute);
            if (!answer) {
                // we may have a copy of the attribute
                Attribute copy = attribute(attribute.getQName());
                if (copy != null) {
                    list.remove(copy);
                    answer = true;
                }
            }
        } else if (attributes != null) {
            if (attribute.equals(attributes)) {
                attributes = null;
                answer = true;
            } else {
                // we may have a copy of the attribute
                Attribute other = (Attribute) attributes;
                if (attribute.getQName().equals(other.getQName())) {
                    attributes = null;
                    answer = true;
                }
            }
        }
        if (answer) {
            childRemoved(attribute);
        }
        return answer;
    }

    // Implementation methods
    //-------------------------------------------------------------------------
    protected void addNewNode(Node node) {
        if (content == null) {
            content = node;
        } else {
            if (content instanceof List) {
                List list = (List) content;
                list.add(node);
            } else {
                List list = createContentList();
                list.add(content);
                list.add(node);
                content = list;
            }
        }
        childAdded(node);
    }

    protected boolean removeNode(Node node) {

        boolean answer = false;

        if (content != null) {

            if (content == node) {

                content = null;

                answer = true;

            } else if (content instanceof List) {

                List list = (List) content;

                answer = list.remove(node);

            }

        }

        if (answer) {

            childRemoved(node);

        }

        return answer;

    }

    protected List contentList() {

        if (content instanceof List) {

            return (List) content;

        } else {

            List list = createContentList();

            if (content != null) {

                list.add(content);

            }

            content = list;

            return list;

        }

    }

    protected List attributeList() {

        if (attributes instanceof List) {

            return (List) attributes;

        } else if (attributes != null) {

            List list = createAttributeList();

            list.add(attributes);

            attributes = list;

            return list;

        } else {

            List list = createAttributeList();

            attributes = list;

            return list;

        }

    }

    protected List attributeList(int size) {

        if (attributes instanceof List) {

            return (List) attributes;

        } else if (attributes != null) {

            List list = createAttributeList(size);

            list.add(attributes);

            attributes = list;

            return list;

        } else {

            List list = createAttributeList(size);

            attributes = list;

            return list;

        }

    }

    protected void setAttributeList(List attributes) {

        this.attributes = attributes;

    }

}

/*
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 * 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.
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 *    products derived from this Software without prior written
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 *    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: DefaultElement.java,v 1.1 2003/11/02 18:10:03 per_nyfelt Exp $
 */