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IndirectCollection.java
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IndirectCollection.java
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/**
* Copyright (C) 2019 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jopa.adapters;
import cz.cvut.kbss.jopa.sessions.UnitOfWorkImpl;
import java.lang.reflect.Field;
public abstract class IndirectCollection<T> {
protected final Object owner;
protected final Field field;
protected final UnitOfWorkImpl persistenceContext;
protected IndirectCollection() {
owner = null;
field = null;
persistenceContext = null;
}
/**
* Create new indirect collection from the specified data.
* <p>
* The owner can be null, the persistence context not.
*
* @param owner Owner of the indirect collection
* @param f The field holding this collection
* @param persistenceContext Persistence context the owner belongs to
* @throws NullPointerException If the persistence context is null
*/
protected IndirectCollection(Object owner, Field f, UnitOfWorkImpl persistenceContext) {
if (persistenceContext == null) {
throw new NullPointerException("Null passed in as persistenceContext.");
}
this.owner = owner;
this.field = f;
this.persistenceContext = persistenceContext;
}
protected void persistChange() {
assert persistenceContext != null;
if (persistenceContext.isInTransaction() && !persistenceContext.isInCommit()) {
persistenceContext.attributeChanged(owner, field);
}
}
/**
* The returned type is determined by the instance type parameter.
*
* @return The collection wrapped in this indirect collection
*/
public abstract T getReferencedCollection();
}