/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)
*
* This library 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 library 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.
*
* For further information about Alkacon Software GmbH, please see the
* company website: http://www.alkacon.com
*
* For further information about OpenCms, please see the
* project website: http://www.opencms.org
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.opencms.relations;
import org.dom4j.Attribute;
import org.dom4j.Element;
/**
* An utility class for updating the link xml node.<p>
*
* @since 6.0.0
*/
public final class CmsLinkUpdateUtil {
/**
* Prevents the instanciation of this utility class.<p>
*/
private CmsLinkUpdateUtil() {
// no-op
}
/**
* Updates the type for a link xml element node.<p>
*
* @param element the link element node to update
* @param type the relation type to set
*/
public static void updateType(Element element, CmsRelationType type) {
updateAttribute(element, CmsLink.ATTRIBUTE_TYPE, type.getNameForXml());
}
/**
* Updates the link node in the underlying XML page document.<p>
*
* @param link the link to update
* @param element the <link> element to update
* @param updateOnly if set and the element has no {@link CmsLink#NODE_TARGET} subelement, so no action if executed at all
*/
public static void updateXml(CmsLink link, Element element, boolean updateOnly) {
// if element is not null
if (element != null) {
if (!updateOnly || (element.element(CmsLink.NODE_TARGET) != null)) {
String strId = (link.getStructureId() == null ? null : link.getStructureId().toString());
updateNode(element, CmsLink.NODE_TARGET, link.getTarget(), true);
updateNode(element, CmsLink.NODE_UUID, strId, false);
updateNode(element, CmsLink.NODE_ANCHOR, link.getAnchor(), true);
updateNode(element, CmsLink.NODE_QUERY, link.getQuery(), true);
}
}
}
/**
* Updates the given xml element with this link information.<p>
*
* @param link the link to get the information from
* @param name the (optional) name of the link
* @param element the <link> element to update
*/
public static void updateXmlForHtmlValue(CmsLink link, String name, Element element) {
// if element is not null
if (element != null) {
// update the additional attributes
if (name != null) {
updateAttribute(element, CmsLink.ATTRIBUTE_NAME, link.getName());
}
updateAttribute(element, CmsLink.ATTRIBUTE_INTERNAL, Boolean.toString(link.isInternal()));
// update the common sub-elements and attributes
updateXmlForVfsFile(link, element);
}
}
/**
* Updates the given xml element with this link information.<p>
*
* @param link the link to get the information from
* @param element the <link> element to update
*/
public static void updateXmlForVfsFile(CmsLink link, Element element) {
// if element is not null
if (element != null) {
// update the type attribute
updateAttribute(element, CmsLink.ATTRIBUTE_TYPE, link.getType().getNameForXml());
// update the sub-elements
updateXml(link, element, false);
}
}
/**
* Updates the given xml element attribute with the given value.<p>
*
* @param parent the element to set the attribute for
* @param attrName the attribute name
* @param value the value to set, or <code>null</code> to remove
*/
private static void updateAttribute(Element parent, String attrName, String value) {
if (parent != null) {
Attribute attribute = parent.attribute(attrName);
if (value != null) {
if (attribute == null) {
parent.addAttribute(attrName, value);
} else {
attribute.setValue(value);
}
} else {
// remove only if exists
if (attribute != null) {
parent.remove(attribute);
}
}
}
}
/**
* Updates the given xml node with the given value.<p>
*
* @param parent the parent node
* @param nodeName the node to update
* @param value the value to use to update the given node, can be <code>null</code>
* @param cdata if the value should be in a CDATA section or not
*/
private static void updateNode(Element parent, String nodeName, String value, boolean cdata) {
// get current node element
Element nodeElement = parent.element(nodeName);
if (value != null) {
if (nodeElement == null) {
// element wasn't there before, add element and set value
nodeElement = parent.addElement(nodeName);
}
// element is there, update element value
nodeElement.clearContent();
if (cdata) {
nodeElement.addCDATA(value);
} else {
nodeElement.addText(value);
}
} else {
// remove only if element exists
if (nodeElement != null) {
// remove element
parent.remove(nodeElement);
}
}
}
}