001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *
010 *        http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License.
018 */
019
020package org.apache.isis.core.metamodel.specloader.specimpl.objectlist;
021
022import java.util.List;
023
024import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
025import org.apache.isis.core.metamodel.facetapi.FacetHolder;
026import org.apache.isis.core.metamodel.facets.collections.CollectionFacetAbstract;
027import org.apache.isis.core.metamodel.spec.FreeStandingList;
028
029public class CollectionFacetForFreeStandingList extends CollectionFacetAbstract {
030
031    public CollectionFacetForFreeStandingList(final FacetHolder holder) {
032        super(holder);
033    }
034
035    /**
036     * Expected to be called with a {@link ObjectAdapter} wrapping a
037     * {@link FreeStandingList}.
038     */
039    @Override
040    public List<ObjectAdapter> collection(final ObjectAdapter wrappedObjectList) {
041        return (FreeStandingList) wrappedObjectList.getObject();
042    }
043
044    /**
045     * Expected to be called with a {@link ObjectAdapter} wrapping a
046     * {@link FreeStandingList}.
047     */
048    @Override
049    public ObjectAdapter firstElement(final ObjectAdapter wrappedInstanceCollectionVector) {
050        final List<ObjectAdapter> icv = collection(wrappedInstanceCollectionVector);
051        return icv.size() > 0 ? icv.get(0) : null;
052    }
053
054    /**
055     * Expected to be called with a {@link ObjectAdapter} wrapping a
056     * {@link FreeStandingList}.
057     */
058    @Override
059    public int size(final ObjectAdapter wrappedInstanceCollectionVector) {
060        return collection(wrappedInstanceCollectionVector).size();
061    }
062
063    /**
064     * Does nothing.
065     */
066    @Override
067    public void init(final ObjectAdapter collection, final ObjectAdapter[] initData) {
068    }
069
070}