/*
* 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.choices;
import java.util.List;
import com.google.common.collect.Lists;
import org.apache.isis.applib.events.UsabilityEvent;
import org.apache.isis.applib.events.ValidityEvent;
import org.apache.isis.applib.marker.Bounded;
import org.apache.isis.applib.query.Query;
import org.apache.isis.applib.query.QueryFindAllInstances;
import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
import org.apache.isis.core.metamodel.adapter.QuerySubmitter;
import org.apache.isis.core.metamodel.facetapi.Facet;
import org.apache.isis.core.metamodel.facetapi.FacetAbstract;
import org.apache.isis.core.metamodel.facetapi.FacetHolder;
import org.apache.isis.core.metamodel.facets.propparam.choices.ChoicesFacet;
import org.apache.isis.core.metamodel.interactions.DisablingInteractionAdvisor;
import org.apache.isis.core.metamodel.interactions.ObjectValidityContext;
import org.apache.isis.core.metamodel.interactions.UsabilityContext;
import org.apache.isis.core.metamodel.interactions.ValidatingInteractionAdvisor;
import org.apache.isis.core.metamodel.interactions.ValidityContext;
import org.apache.isis.core.metamodel.spec.ObjectSpecification;
/**
* A fixed number of choices because the number of instances of this class is bounded.
*
* <p>
* Typically viewers will interpret this information by displaying all instances
* of the class in a drop-down list box or similar widget.
*
* <p>
* In the standard Apache Isis Programming Model, corresponds to annotating the
* member with {@link org.apache.isis.applib.annotation.Bounded Bounded} annotation
* or implementing the {@link Bounded} marker interface.
*/
public abstract class ChoicesFacetFromBoundedAbstract extends FacetAbstract implements ChoicesFacet, DisablingInteractionAdvisor, ValidatingInteractionAdvisor {
public static Class<? extends Facet> type() {
return ChoicesFacet.class;
}
private final QuerySubmitter querySubmitter;
public ChoicesFacetFromBoundedAbstract(final FacetHolder holder, final QuerySubmitter querySubmitter) {
super(type(), holder, Derivation.NOT_DERIVED);
this.querySubmitter = querySubmitter;
}
protected QuerySubmitter getQuerySubmitter() {
return querySubmitter;
}
@Override
public String invalidates(final ValidityContext<? extends ValidityEvent> context) {
if (!(context instanceof ObjectValidityContext)) {
return null;
}
final ObjectAdapter target = context.getTarget();
if(target == null) {
return null;
}
// ensure that the target is of the correct type
if(!(getFacetHolder() instanceof ObjectSpecification)) {
// should never be the case
return null;
}
final ObjectSpecification objectSpec = getObjectSpecification();
return objectSpec == target.getSpecification()? null: "Invalid type";
}
private ObjectSpecification getObjectSpecification() {
return (ObjectSpecification) getFacetHolder();
}
@Override
public String disables(final UsabilityContext<? extends UsabilityEvent> context) {
final ObjectAdapter target = context.getTarget();
return disabledReason(target);
}
/**
* Optional hook method for subclasses to override.
*/
public String disabledReason(final ObjectAdapter inObject) {
return "Bounded";
}
@SuppressWarnings({ "rawtypes", "unchecked" })
@Override
public Object[] getChoices(ObjectAdapter adapter) {
final Query query = new QueryFindAllInstances(getObjectSpecification().getFullIdentifier());
final List<ObjectAdapter> allInstancesAdapter = getQuerySubmitter().allMatchingQuery(query);
final List<ObjectAdapter> adapters = Lists.newArrayList(allInstancesAdapter.iterator());
final List<Object> pojos = Lists.transform(adapters, ObjectAdapter.Functions.getObject());
return Lists.newArrayList(pojos).toArray();
}
}