/*
* 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.defaults;
import org.apache.isis.applib.adapters.DefaultsProvider;
import org.apache.isis.applib.adapters.EncoderDecoder;
import org.apache.isis.core.commons.lang.ClassExtensions;
import org.apache.isis.core.metamodel.facetapi.FacetAbstract;
import org.apache.isis.core.metamodel.facetapi.FacetHolder;
import org.apache.isis.core.metamodel.services.ServicesInjector;
public abstract class DefaultedFacetAbstract extends FacetAbstract implements DefaultedFacet {
private final Class<?> defaultsProviderClass;
// to delegate to
private final DefaultedFacetUsingDefaultsProvider defaultedFacetUsingDefaultsProvider;
private final ServicesInjector dependencyInjector;
public DefaultedFacetAbstract(final String candidateEncoderDecoderName, final Class<?> candidateEncoderDecoderClass, final FacetHolder holder, final ServicesInjector dependencyInjector) {
super(DefaultedFacet.class, holder, Derivation.NOT_DERIVED);
this.defaultsProviderClass = DefaultsProviderUtil.defaultsProviderOrNull(candidateEncoderDecoderClass, candidateEncoderDecoderName);
this.dependencyInjector = dependencyInjector;
if (isValid()) {
final DefaultsProvider<?> defaultsProvider = (DefaultsProvider<?>) ClassExtensions.newInstance(defaultsProviderClass, FacetHolder.class, holder);
this.defaultedFacetUsingDefaultsProvider = new DefaultedFacetUsingDefaultsProvider(defaultsProvider, holder, getDependencyInjector());
} else {
this.defaultedFacetUsingDefaultsProvider = null;
}
}
/**
* Discover whether either of the candidate defaults provider name or class
* is valid.
*/
public boolean isValid() {
return defaultsProviderClass != null;
}
/**
* Guaranteed to implement the {@link EncoderDecoder} class, thanks to
* generics in the applib.
*/
public Class<?> getDefaultsProviderClass() {
return defaultsProviderClass;
}
@Override
public Object getDefault() {
return defaultedFacetUsingDefaultsProvider.getDefault();
}
@Override
protected String toStringValues() {
return defaultsProviderClass.getName();
}
// //////////////////////////////////////////////////////
// Dependencies (from constructor)
// //////////////////////////////////////////////////////
private ServicesInjector getDependencyInjector() {
return dependencyInjector;
}
}