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/*****************************************************************************
* Copyright (c) 2014 CEA LIST.
*
* 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:
* Camille Letavernier (CEA LIST) camille.letavernier@cea.fr - Initial API and implementation
*****************************************************************************/
package org.eclipse.papyrus.uml.properties.databinding;
import java.util.Collection;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import org.eclipse.core.databinding.observable.list.IObservableList;
import org.eclipse.core.databinding.observable.list.WritableList;
import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.common.command.IdentityCommand;
import org.eclipse.emf.common.command.UnexecutableCommand;
import org.eclipse.emf.edit.domain.EditingDomain;
import org.eclipse.gef.EditPart;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.papyrus.infra.emf.appearance.helper.VisualInformationPapyrusConstants;
import org.eclipse.papyrus.infra.gmfdiag.common.databinding.custom.CustomStringStyleObservableList;
import org.eclipse.papyrus.infra.gmfdiag.common.editpolicies.IMaskManagedLabelEditPolicy;
/**
* An IObservableList for the StringListValueStyle named "maskLabel" (See {@link VisualInformationPapyrusConstants#CUSTOM_MASK_LABEL}
*
* It is used for configuring an {@link IMaskManagedLabelEditPolicy}
*
* @author Camille Letavernier
*
*/
public class MaskValueObservableList extends CustomStringStyleObservableList {
private EditPart editPart;
private EditingDomain domain;
public MaskValueObservableList(EditPart editPart, EditingDomain domain) {
super(getView(editPart), domain, VisualInformationPapyrusConstants.CUSTOM_MASK_LABEL);
this.editPart = editPart;
this.domain = domain;
updateWrappedList(getDefaultValues());
}
private static View getView(EditPart editPart) {
return (View)editPart.getModel();
}
@Override
protected IObservableList getConcreteList() {
if(!isStyleCreated()) {
return new WritableList(getDefaultValues(), String.class);
}
return super.getConcreteList();
}
protected List<String> getDefaultValues() {
return new LinkedList<String>(((IMaskManagedLabelEditPolicy)editPart.getEditPolicy(IMaskManagedLabelEditPolicy.MASK_MANAGED_LABEL_EDIT_POLICY)).getCurrentDisplayValue());
}
@Override
protected void refreshCacheList() {
super.refreshCacheList();
((IMaskManagedLabelEditPolicy)editPart.getEditPolicy(IMaskManagedLabelEditPolicy.MASK_MANAGED_LABEL_EDIT_POLICY)).refreshDisplay();
}
//When the style is not yet created (Style#values = []), we need to transform the commands. In this case, the "current value" equals "defaut value", which is not always empty.
//The superclass expects an empty default state, and will return Unexecutable commands if we try to e.g. remove elements
//For example, if our default state is [name, visibility], we can handle a "Remove visibility" command, by creating a [name] list.
@Override
public Command getRemoveCommand(Object value) {
if(isStyleCreated()) {
return super.getRemoveCommand(value);
}
//The current list is not always empty, even if the style is not defined: we have a default value
Collection<Object> currentValues = new HashSet<Object>(wrappedList);
if(currentValues.remove(value)) {
return getAddAllCommand(currentValues);
}
return UnexecutableCommand.INSTANCE;
}
@Override
public Command getRemoveAllCommand(Collection<?> values) {
if(isStyleCreated()) {
return super.getRemoveAllCommand(values);
}
Collection<Object> currentValues = new HashSet<Object>(wrappedList);
if(currentValues.containsAll(values)) {
currentValues.removeAll(values);
if(currentValues.isEmpty()) {
return IdentityCommand.INSTANCE;
}
return getAddAllCommand(currentValues);
}
return UnexecutableCommand.INSTANCE;
}
}
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