/**
* Copyright 2004-2016 Riccardo Solmi. All rights reserved.
* This file is part of the Whole Platform.
*
* The Whole Platform 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 3 of the License, or
* (at your option) any later version.
*
* The Whole Platform 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.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the Whole Platform. If not, see <http://www.gnu.org/licenses/>.
*/
package org.whole.lang.ui.commands;
import org.eclipse.gef.commands.Command;
import org.whole.lang.commons.reflect.CommonsEntityDescriptorEnum;
import org.whole.lang.matchers.Matcher;
import org.whole.lang.model.IEntity;
import org.whole.lang.reflect.EntityDescriptor;
import org.whole.lang.util.EntityUtils;
/**
* @author Riccardo Solmi
*/
public class ReplaceChildCommand extends Command implements ILegacyCommand {
protected IEntity parent;
protected IEntity oldChild;
protected IEntity newChild;
public void execute() {
parent.wSet(oldChild, newChild);
}
public void undo() {
parent.wSet(newChild, oldChild);
}
public void setParent(IEntity parent) {
this.parent = parent;
}
public void setOldChild(IEntity oldChild) {
this.oldChild = oldChild;
}
public void setNewChild(IEntity newChild) {
this.newChild = newChild;
}
public boolean canExecute() {
if (!EntityUtils.hasParent(oldChild))
return false;
if (EntityUtils.isVariable(parent) && Matcher.matchImpl(CommonsEntityDescriptorEnum.VarType, newChild))
return !EntityUtils.hasParent(parent) || parent.wGetParent().wGetEntityDescriptor(parent)
.isPlatformSupertypeOf((EntityDescriptor<?>) newChild.wGetValue());
else
return EntityUtils.isFragment(parent) ||
parent.wContains(oldChild) &&
parent.wGetEntityDescriptor(oldChild).isPlatformSupertypeOf(newChild.wGetEntityDescriptor());
}
}