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.progmodel.facets.collections.collection;
021
022import java.util.Collection;
023import java.util.Iterator;
024
025import com.google.common.collect.Collections2;
026
027import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
028import org.apache.isis.core.metamodel.adapter.mgr.AdapterManager;
029import org.apache.isis.core.metamodel.facetapi.FacetHolder;
030import org.apache.isis.core.metamodel.facets.collections.CollectionFacetAbstract;
031
032public class JavaCollectionFacet extends CollectionFacetAbstract {
033
034    private final AdapterManager adapterManager;
035
036    public JavaCollectionFacet(final FacetHolder holder, final AdapterManager adapterManager) {
037        super(holder);
038        this.adapterManager = adapterManager;
039    }
040
041    @Override
042    @SuppressWarnings("unchecked")
043    public Collection<ObjectAdapter> collection(final ObjectAdapter wrappedCollection) {
044        final Collection<?> collectionOfUnderlying = collectionOfUnderlying(wrappedCollection);
045        return Collections2.transform(collectionOfUnderlying, new ObjectToAdapterFunction(getAdapterManager()));
046    }
047
048    @Override
049    public ObjectAdapter firstElement(final ObjectAdapter collection) {
050        final Iterator<ObjectAdapter> iterator = iterator(collection);
051        return iterator.hasNext() ? iterator.next() : null;
052    }
053
054    @Override
055    public int size(final ObjectAdapter collection) {
056        return collectionOfUnderlying(collection).size();
057    }
058
059    @Override
060    public void init(final ObjectAdapter collection, final ObjectAdapter[] initData) {
061        final Collection<? super Object> javaCollection = collectionOfUnderlying(collection);
062        javaCollection.clear();
063        for (final ObjectAdapter element : initData) {
064            final Object pojo = element.getObject();
065            javaCollection.add(pojo);
066        }
067    }
068
069    /**
070     * The underlying collection of objects (not {@link ObjectAdapter}s).
071     */
072    @SuppressWarnings("unchecked")
073    private Collection<? super Object> collectionOfUnderlying(final ObjectAdapter wrappedCollection) {
074        return (Collection<? super Object>) wrappedCollection.getObject();
075    }
076
077    // //////////////////////////////////////////////////////////////////////
078    // Dependencies (from constructor)
079    // //////////////////////////////////////////////////////////////////////
080
081    private AdapterManager getAdapterManager() {
082        return adapterManager;
083    }
084
085}