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/*******************************************************************************
* Copyright (c) 2008-2010 Sonatype, Inc.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Sonatype, Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.m2e.model.edit.pom.translators;
import java.util.Collections;
import java.util.List;
import org.eclipse.emf.ecore.EAttribute;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.wst.common.internal.emf.utilities.ExtendedEcoreUtil;
import org.eclipse.wst.sse.core.internal.provisional.INodeAdapter;
import org.eclipse.wst.sse.core.internal.provisional.INodeNotifier;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
/**
* Handles notifications from the DOM that a simple text value has changed.
*
* @author Mike Poindexter
*/
class ValueUpdateAdapter extends TranslatorAdapter implements INodeAdapter {
/**
*
*/
private EObject modelObject;
private EStructuralFeature feature;
private List<Node> linkedWhitespaceNodes = Collections.emptyList();
public ValueUpdateAdapter(SSESyncResource resource, Element node,
EObject object, EStructuralFeature feature) {
super(resource);
this.node = node;
this.modelObject = object;
this.feature = feature;
}
public boolean isAdapterForType(Object type) {
return ValueUpdateAdapter.class.equals(type);
}
public void notifyChanged(INodeNotifier notifier, int eventType,
Object changedFeature, Object oldValue, Object newValue, int pos) {
if (resource.isProcessEvents()) {
try {
resource.setProcessEvents(false);
if (newValue instanceof Text) {
changedFeature = newValue;
newValue = ((Text) newValue).getData();
}
if (changedFeature instanceof Text) {
if (null == newValue) {
ExtendedEcoreUtil.eUnsetOrRemove(modelObject, feature,
oldValue);
} else {
ExtendedEcoreUtil.eSetOrAdd(modelObject, feature,
newValue.toString().trim());
}
}
} finally {
resource.setProcessEvents(true);
}
}
}
@Override
public void load() {
Object value = getElementText(node);
if (feature instanceof EAttribute) {
EAttribute ea = (EAttribute) feature;
value = EcoreUtil.createFromString(ea.getEAttributeType(), value
.toString());
}
modelObject.eSet(feature, value);
}
@Override
public void save() {
setElementTextValue(node, null, modelObject.eGet(feature));
}
@Override
public void update(Object oldValue, Object newValue, int index) {
setElementTextValue(node, oldValue, modelObject.eGet(feature));
}
/**
* Sets the text value of an existing node, attempting to preserve
* whitespace
*
* @param element
* @param oldValue
* @param newValue
*/
private void setElementTextValue(Element element, Object oldValue,
Object newValue) {
newValue = newValue == null ? "" : newValue.toString(); //$NON-NLS-1$
boolean replacedChild = false;
if (oldValue != null) {
// First try to find a text node with the old value and set it (to
// preserve whitespace)
NodeList children = element.getChildNodes();
int nChildren = children.getLength();
for (int i = 0; i < nChildren; i++) {
Node child = children.item(i);
if (child instanceof Text) {
String value = ((Text) child).getData();
int oldIdx = value.indexOf(oldValue.toString());
if (oldIdx > -1) {
String replacement = value.substring(0, oldIdx)
+ newValue.toString()
+ value.substring(oldIdx
+ oldValue.toString().length());
((Text) child).setData(replacement);
replacedChild = true;
}
}
}
}
// If for some reason we couldn't find a text to update, just clear the
// element contents and put in our text.
if (!replacedChild) {
while (element.getFirstChild() != null) {
element.removeChild(element.getFirstChild());
}
Text text = node.getOwnerDocument().createTextNode(
newValue.toString());
element.appendChild(text);
}
}
public List<Node> getLinkedWhitespaceNodes() {
return linkedWhitespaceNodes;
}
public void setLinkedWhitespaceNodes(List<Node> linkedWhitespaceNodes) {
this.linkedWhitespaceNodes = linkedWhitespaceNodes;
}
}
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