/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.isis.viewer.dnd.tree;
import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
import org.apache.isis.core.metamodel.facets.collections.modify.CollectionFacet;
import org.apache.isis.core.metamodel.facets.collections.modify.CollectionFacetUtils;
import org.apache.isis.viewer.dnd.view.Axes;
import org.apache.isis.viewer.dnd.view.Content;
import org.apache.isis.viewer.dnd.view.ViewRequirement;
import org.apache.isis.viewer.dnd.view.base.Layout;
import org.apache.isis.viewer.dnd.view.composite.CollectionElementBuilder;
import org.apache.isis.viewer.dnd.view.composite.StackLayout;
/**
* Specification for a tree node that will display an open collection as a root
* node or within an object.
*
* @see org.apache.isis.viewer.dnd.tree.ClosedCollectionNodeSpecification for
* displaying a closed collection within an object.
*/
public class OpenCollectionNodeSpecification extends CompositeNodeSpecification {
/**
* A collection tree can only be displayed for a collection that has
* elements.
*/
@Override
public boolean canDisplay(final ViewRequirement requirement) {
final ObjectAdapter collection = requirement.getAdapter();
if (collection == null) {
return false;
} else {
final CollectionFacet facet = CollectionFacetUtils.getCollectionFacetFromSpec(collection);
return facet != null && facet.size(collection) > 0;
}
}
public OpenCollectionNodeSpecification() {
builder = new CollectionElementBuilder(this);
}
@Override
public Layout createLayout(final Content content, final Axes axes) {
return new StackLayout();
}
@Override
public boolean isOpen() {
return true;
}
@Override
public boolean isSubView() {
return false;
}
@Override
public int canOpen(final Content content) {
return CAN_OPEN;
}
@Override
public String getName() {
return "Collection tree node - open";
}
}