/*******************************************************************************
* Copyright (c) 2007 Exadel, Inc. and Red Hat, Inc.
* Distributed under license by Red Hat, Inc. All rights reserved.
* This program is 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:
* Exadel, Inc. and Red Hat, Inc. - initial API and implementation
******************************************************************************/
package org.jboss.tools.common.meta.action.impl.handlers;
import org.jboss.tools.common.model.*;
import org.jboss.tools.common.model.undo.*;
import org.jboss.tools.common.meta.*;
import org.jboss.tools.common.meta.action.impl.AbstractHandler;
public class DefaultRemoveHandler extends AbstractHandler {
public DefaultRemoveHandler() {}
public void executeHandler(XModelObject object, java.util.Properties p) throws XModelException {
if(!isEnabled(object)) return;
if(!isUniqueRequiredChild(object)) {
removeFromParent(object);
} else {
cleanUniqueRequiredChild(object);
}
}
public boolean getSignificantFlag(XModelObject object) {
return true;
}
public boolean isEnabled(XModelObject object) {
if(object == null || !object.isObjectEditable()) return false;
if(XModelObjectConstants.YES.equals(object.getAttributeValue("issystem"))) return false; //$NON-NLS-1$
if(object.getParent() == null) return false;
if(isUniqueRequiredChild(object)) return isUniqueRequiredChildSet(object);
return true;
}
public void setDefaultData(XModelObject object) {}
public static void removeFromParent(XModelObject object) {
if(object == null) return;
XModelObject parent = object.getParent();
if(parent == null) return;
object.removeFromParent();
XUndoManager undo = DefaultCreateHandler.getUndoManager(parent);
if(undo != null) {
parent.getModel().getUndoManager().addUndoable(new XRemoveUndo(parent, object));
}
parent.setModified(true);
}
private boolean isUniqueRequiredChild(XModelObject object) {
XModelObject p = object.getParent();
if(p == null) return false;
XChild c = p.getModelEntity().getChild(object.getModelEntity().getName());
return c != null && c.isRequired() && c.getMaxCount() == 1;
}
private boolean isUniqueRequiredChildSet(XModelObject object) {
XAttribute[] as = object.getModelEntity().getAttributes();
for (int i = 0; i < as.length; i++) {
String xml = as[i].getXMLName();
if(xml == null || xml.length() == 0) continue;
String n = as[i].getName();
String dv = as[i].getDefaultValue();
if(dv == null) dv = ""; //$NON-NLS-1$
String v = object.getAttributeValue(n);
if(!dv.equals(v)) return true;
}
XModelObject[] cs = object.getChildren();
for (int i = 0; i < cs.length; i++) {
if(isEnabled(cs[i])) return true;
}
return false;
}
private void cleanUniqueRequiredChild(XModelObject object) throws XModelException {
XAttribute[] as = object.getModelEntity().getAttributes();
for (int i = 0; i < as.length; i++) {
String xml = as[i].getXMLName();
if(xml == null || xml.length() == 0) continue;
String n = as[i].getName();
String v = as[i].getDefaultValue();
if(v == null) v = ""; //$NON-NLS-1$
object.getModel().changeObjectAttribute(object, n, v);
}
XModelObject[] cs = object.getChildren();
for (int i = 0; i < cs.length; i++) {
executeHandler(cs[i], null);
}
}
}