MixinFacetForMixinAnnotation.java

/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */

package org.apache.isis.core.metamodel.facets.object.mixin;

import java.lang.reflect.Constructor;

import org.apache.isis.applib.annotation.Mixin;
import org.apache.isis.core.metamodel.facetapi.Facet;
import org.apache.isis.core.metamodel.facetapi.FacetHolder;
import org.apache.isis.core.metamodel.services.ServicesInjector;

public class MixinFacetForMixinAnnotation extends MixinFacetAbstract {

    public static Class<? extends Facet> type() {
        return MixinFacet.class;
    }

    private MixinFacetForMixinAnnotation(
            final Class<?> mixinType,
            final String value, final Class<?> constructorType,
            final FacetHolder holder,
            final ServicesInjector servicesInjector) {
        super(mixinType, value, constructorType, holder, servicesInjector);
    }

    public static MixinFacet create(
            final Class<?> candidateMixinType, final FacetHolder facetHolder,
            final ServicesInjector servicesInjector) {
        final Mixin mixin = candidateMixinType.getAnnotation(Mixin.class);
        if(mixin == null) {
            return null;
        }
        final Constructor<?>[] constructors = candidateMixinType.getConstructors();
        for (Constructor<?> constructor : constructors) {
            final Class<?>[] constructorTypes = constructor.getParameterTypes();
            if(constructorTypes.length != 1) {
                continue;
            }
            final Class<?> constructorType = constructorTypes[0];
            return new MixinFacetForMixinAnnotation(candidateMixinType, mixin.method(), constructorType, facetHolder, servicesInjector);
        }
        return null;
    }

}