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.object.facets;
021
022import java.util.ArrayList;
023import java.util.List;
024
025import org.apache.isis.core.commons.exceptions.IsisException;
026import org.apache.isis.core.commons.factory.InstanceUtil;
027import org.apache.isis.core.metamodel.facetapi.Facet;
028import org.apache.isis.core.metamodel.facetapi.FacetAbstract;
029import org.apache.isis.core.metamodel.facetapi.FacetHolder;
030import org.apache.isis.core.metamodel.facets.FacetFactory;
031import org.apache.isis.core.metamodel.facets.object.facets.FacetsFacet;
032
033public abstract class FacetsFacetAbstract extends FacetAbstract implements FacetsFacet {
034
035    public static Class<? extends Facet> type() {
036        return FacetsFacet.class;
037    }
038
039    private final Class<? extends FacetFactory>[] facetFactories;
040
041    public FacetsFacetAbstract(final String[] names, final Class<?>[] classes, final FacetHolder holder) {
042        super(type(), holder, Derivation.NOT_DERIVED);
043        final List<Class<? extends FacetFactory>> facetFactories = new ArrayList<Class<? extends FacetFactory>>();
044        for (final String name : names) {
045            final Class<? extends FacetFactory> facetFactory = facetFactoryOrNull(name);
046            if (facetFactory != null) {
047                facetFactories.add(facetFactory);
048            }
049        }
050        for (final Class<?> classe : classes) {
051            final Class<? extends FacetFactory> facetFactory = facetFactoryOrNull(classe);
052            if (facetFactory != null) {
053                facetFactories.add(facetFactory);
054            }
055        }
056        this.facetFactories = asArray(facetFactories);
057    }
058
059    @SuppressWarnings("unchecked")
060    private Class<? extends FacetFactory>[] asArray(final List<Class<? extends FacetFactory>> facetFactories) {
061        return facetFactories.toArray(new Class[] {});
062    }
063
064    @Override
065    public Class<? extends FacetFactory>[] facetFactories() {
066        return facetFactories;
067    }
068
069    private Class<? extends FacetFactory> facetFactoryOrNull(final String classCandidateName) {
070        if (classCandidateName == null) {
071            return null;
072        }
073        Class<?> classCandidate = null;
074        try {
075            classCandidate = InstanceUtil.loadClass(classCandidateName);
076            return facetFactoryOrNull(classCandidate);
077        } catch (final IsisException ex) {
078            return null;
079        }
080    }
081
082    @SuppressWarnings("unchecked")
083    private Class<? extends FacetFactory> facetFactoryOrNull(final Class<?> classCandidate) {
084        if (classCandidate == null) {
085            return null;
086        }
087        return (Class<? extends FacetFactory>) (FacetFactory.class.isAssignableFrom(classCandidate) ? classCandidate : null);
088    }
089
090}