AbstractTestDataBuilder.java
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package net.ziemers.swxercise.lg.testdata.testdatabuilder;
import javax.persistence.EntityManager;
public abstract class AbstractTestDataBuilder<T> {
private static int count = 0;
private EntityManager entityManager;
/**
* Creates an new TestdataBuilder with persistence.
*
* @param entityManager
*/
public AbstractTestDataBuilder(final EntityManager entityManager) {
this.entityManager = entityManager;
}
/**
* Creates an new TestdataBuilder without persistence.
*/
public AbstractTestDataBuilder() {
}
public abstract T build();
/**
* Returns the EntityManager or null.
*
* @return {@link EntityManager} or null
*/
protected final EntityManager getEntityManager() {
return entityManager;
}
/**
* Ensure the TestdataBuilder is constructed with a
* {@link EntityManager}
*
* @throws IllegalStateException
* if the TestdataBuilder is constructed without a
* {@link EntityManager}
*/
protected final void ensureEntityManager() {
if (entityManager == null) {
throw new IllegalStateException("Cannot persist w/o entity manager");
}
}
/**
* {@inheritDoc} Executed within a new transaction.
*
* @throws IllegalStateException
* if the TestdataBuilder is constructed without a
* {@link EntityManager}
*/
public final T buildAndSave() {
ensureEntityManager();
try {
final T obj = build();
entityManager.persist(obj);
return obj;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* Returns an integer value from an static counter.
*
* @return value of the static counter.
*/
protected final int getId() {
return count++;
}
}