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.facets.collections.modify;
021
022import java.util.ArrayList;
023import java.util.List;
024
025import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
026import org.apache.isis.core.metamodel.spec.ObjectSpecification;
027
028public final class CollectionFacetUtils {
029    private CollectionFacetUtils() {
030    }
031
032    public static CollectionFacet getCollectionFacetFromSpec(final ObjectAdapter objectRepresentingCollection) {
033        final ObjectSpecification collectionSpec = objectRepresentingCollection.getSpecification();
034        return collectionSpec.getFacet(CollectionFacet.class);
035    }
036
037    public static int size(final ObjectAdapter collection) {
038        final CollectionFacet facet = getCollectionFacetFromSpec(collection);
039        return facet.size(collection);
040    }
041
042    public static ObjectAdapter firstElement(final ObjectAdapter collection) {
043        final CollectionFacet facet = getCollectionFacetFromSpec(collection);
044        return facet.firstElement(collection);
045    }
046
047    /**
048     * @deprecated - use instead {@link #convertToList(ObjectAdapter)}.
049     */
050    @Deprecated
051    public static Object[] convertToArray(final ObjectAdapter collection) {
052        return convertToList(collection).toArray();
053    }
054
055    public static List<Object> convertToList(final ObjectAdapter collection) {
056        final CollectionFacet facet = getCollectionFacetFromSpec(collection);
057        final List<Object> objects = new ArrayList<Object>();
058        for (final ObjectAdapter adapter : facet.iterable(collection)) {
059            objects.add(adapter.getObject());
060        }
061        return objects;
062    }
063
064    public static List<ObjectAdapter> convertToAdapterList(final ObjectAdapter collection) {
065        final CollectionFacet facet = getCollectionFacetFromSpec(collection);
066        final List<ObjectAdapter> adapters = new ArrayList<ObjectAdapter>();
067        for (final ObjectAdapter adapter : facet.iterable(collection)) {
068            adapters.add(adapter);
069        }
070        return adapters;
071    }
072
073}