/*
* 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.runtime.system.persistence;
import java.lang.reflect.Modifier;
import org.apache.isis.core.metamodel.services.ServicesInjectorSpi;
import org.apache.isis.core.metamodel.spec.ObjectInstantiationException;
import org.apache.isis.core.runtime.system.context.IsisContext;
public class ObjectFactory {
private final Mode mode;
public enum Mode {
/**
* Fail if no {@link ObjectFactory#getServicesInjector() services injector} has been injected.
*/
STRICT,
/**
* Ignore if no {@link ObjectFactory#getServicesInjector() services injector} has been injected
* (intended for testing only).
*/
RELAXED
}
public ObjectFactory() {
this(Mode.STRICT);
}
public ObjectFactory(final Mode mode) {
this.mode = mode;
}
public <T> T instantiate(final Class<T> cls) throws ObjectInstantiationException {
if (mode == Mode.STRICT && getServicesInjector() == null) {
throw new IllegalStateException("ServicesInjector is not available (no open session)");
}
if (Modifier.isAbstract(cls.getModifiers())) {
throw new ObjectInstantiationException("Cannot create an instance of an abstract class: " + cls);
}
final T newInstance = doInstantiate(cls);
if (getServicesInjector() != null) {
getServicesInjector().injectServicesInto(newInstance);
}
return newInstance;
}
//region > doInstantiate
/**
* Simply instantiates reflectively.
*/
protected <T> T doInstantiate(final Class<T> cls) throws ObjectInstantiationException {
if (Modifier.isAbstract(cls.getModifiers())) {
throw new ObjectInstantiationException("Cannot create an instance of an abstract class: " + cls);
}
try {
return cls.newInstance();
} catch (final IllegalAccessException | InstantiationException e) {
throw new ObjectInstantiationException(e);
}
}
//endregion
//region > dependencies (looked up from context)
private PersistenceSession getPersistenceSession() {
return IsisContext.getPersistenceSession();
}
protected ServicesInjectorSpi getServicesInjector() {
return getPersistenceSession().getServicesInjector();
}
//endregion
}