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    
020    package org.apache.isis.core.progmodel.facets.collections.collection;
021    
022    import java.util.Collection;
023    import java.util.Iterator;
024    
025    import org.apache.commons.collections.CollectionUtils;
026    import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
027    import org.apache.isis.core.metamodel.adapter.map.AdapterMap;
028    import org.apache.isis.core.metamodel.facetapi.FacetHolder;
029    import org.apache.isis.core.metamodel.facets.collections.CollectionFacetAbstract;
030    
031    public class JavaCollectionFacet extends CollectionFacetAbstract {
032    
033        private final AdapterMap adapterMap;
034    
035        public JavaCollectionFacet(final FacetHolder holder, final AdapterMap adapterManager) {
036            super(holder);
037            this.adapterMap = adapterManager;
038        }
039    
040        @Override
041        @SuppressWarnings("unchecked")
042        public Collection<ObjectAdapter> collection(final ObjectAdapter wrappedCollection) {
043            final Collection<?> collectionOfUnderlying = collectionOfUnderlying(wrappedCollection);
044            return CollectionUtils.collect(collectionOfUnderlying, new ObjectToAdapterTransformer(getAdapterMap()));
045        }
046    
047        @Override
048        public ObjectAdapter firstElement(final ObjectAdapter collection) {
049            final Iterator<ObjectAdapter> iterator = iterator(collection);
050            return iterator.hasNext() ? iterator.next() : null;
051        }
052    
053        @Override
054        public int size(final ObjectAdapter collection) {
055            return collectionOfUnderlying(collection).size();
056        }
057    
058        @Override
059        @SuppressWarnings("unchecked")
060        public void init(final ObjectAdapter collection, final ObjectAdapter[] initData) {
061            final Collection javaCollection = collectionOfUnderlying(collection);
062            javaCollection.clear();
063            for (final ObjectAdapter element : initData) {
064                javaCollection.add(element.getObject());
065            }
066        }
067    
068        /**
069         * The underlying collection of objects (not {@link ObjectAdapter}s).
070         */
071        private Collection<?> collectionOfUnderlying(final ObjectAdapter wrappedCollection) {
072            return (Collection<?>) wrappedCollection.getObject();
073        }
074    
075        // //////////////////////////////////////////////////////////////////////
076        // Dependencies (from constructor)
077        // //////////////////////////////////////////////////////////////////////
078    
079        private AdapterMap getAdapterMap() {
080            return adapterMap;
081        }
082    
083    }