/*
* 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.spec;
import org.apache.isis.core.metamodel.adapter.ObjectAdapter;
public abstract class InstanceAbstract implements Instance {
private Specification specification;
protected InstanceAbstract() {
this(null, null);
}
protected InstanceAbstract(final ObjectAdapter owner) {
this(owner, null);
}
protected InstanceAbstract(final ObjectAdapter owner, final Specification specification) {
this.specification = specification;
}
@Override
public Specification getSpecification() {
if (specification == null) {
specification = loadSpecification();
}
return specification;
}
/**
* Allows the specification to be lazily loaded.
*/
protected Specification loadSpecification() {
return null;
}
/**
* Allows subclasses to get specification without necessarily triggering
* {@link #loadSpecification() loading} if not yet known.
*/
protected final Specification getSpecificationNoLoad() {
return specification;
}
}