/**
* Copyright 2005-2013 Dozer Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.dozer.eclipse.plugin.editorpage.utils;
import org.eclipse.core.databinding.observable.IObserving;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.ufacekit.core.databinding.instance.IInstanceObservedContainer;
import org.eclipse.ufacekit.core.databinding.instance.InstanceObservables;
import org.eclipse.ufacekit.core.databinding.instance.observable.ILazyObserving;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMDocument;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
public class ObservableUtils {
/**
* Support method for creating chains of LazyObservingValues.
*
* @param container
* @param document
* @param parentObserver
* @param elementName
* @return
*/
public static IObservableValue observeLazyValue(
final IInstanceObservedContainer container,
final IDOMDocument document,
final IObserving parentObserver,
final String elementName) {
IObservableValue observableConfigValue = InstanceObservables.observeValue(
container,
new LocatedLazyObserving() {
public Object getObserved() {
Element e = (Element)parentObserver.getObserved();
return DOMUtils.getElement(e, elementName);
}
public Object createObserved() {
Element newChild = document.createElement(elementName);
Element parentElement = (Element)parentObserver.getObserved();
//Create parent node if necessary
if (parentObserver instanceof ILazyObserving && parentElement == null)
parentElement = (Element)((ILazyObserving)parentObserver).createObserved();
Node refChild = getNextExistentElement(parentElement, newChild);
return parentElement.insertBefore(newChild, refChild);
}
});
return observableConfigValue;
}
/**
* Support method for creating a LazyObserver from a parent node.
*
* @param container
* @param document
* @param parent
* @param elementName
* @return
*/
public static ILazyObserving observeLazyValue(
final IInstanceObservedContainer container,
final IDOMDocument document,
final String elementName) {
ILazyObserving observableConfigValue = (ILazyObserving)InstanceObservables.observeValue(
container,
new LocatedLazyObserving() {
public Object getObserved() {
return document.getDocumentElement();
}
public Object createObserved() {
Element newChild = document.createElement(elementName);
return document.appendChild(newChild);
}
});
return observableConfigValue;
}
}