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[utils] / test / enterprise / src / main / java / org / wamblee / test / inject / JavaEETestInjectorFactory.java

diff --git a/test/enterprise/src/main/java/org/wamblee/test/inject/JavaEETestInjectorFactory.java b/test/enterprise/src/main/java/org/wamblee/test/inject/JavaEETestInjectorFactory.java
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+/*
+ * Copyright 2005-2010 the original author or authors.
+ * 
+ * Licensed 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.wamblee.test.inject;
+
+import javax.persistence.EntityManager;
+
+import org.wamblee.inject.Injector;
+import org.wamblee.inject.InjectorFactory;
+import org.wamblee.inject.InjectorFactoryBuilder;
+import org.wamblee.test.persistence.JpaBuilder;
+
+/**
+ * <p>
+ * The test injector factory provides dependency injection of a contextual entity manager
+ * using the support/inject mini framework. It supports dependency injection of fields
+ * annoted with <code>&#064;PersistenceContext</code>. It only supports one persistence context
+ * at the moment. This injector can be easily used together with {@link JpaBuilder#getContextualEntityManager()}
+ * for obtaining an entity manager in unit test. 
+ * </p>
+ * 
+ * <p>
+ * The reason it is needed is because standard injection mechanisms (such as weld CDI) do not support
+ * entity manager injection in a Java SE environment out of the box.  
+ * </p>
+ *
+ * <p>
+ * To use it, construct the factory using one of the available constructors and set 
+ * {@link InjectorFactoryBuilder#setInjectorFactory(InjectorFactory)).
+ * </p>
+ * 
+ * @author Erik Brakkee
+ *
+ */
+public class JavaEETestInjectorFactory implements InjectorFactory {
+
+    private EntityManager entityManager;
+    private InjectorFactory delegate;
+    
+    /**
+     * Constructs the factory. 
+     * @param aEntityManager Contextual entity manager to inject. 
+     * @param aInjectorFactory Injector factory to delegate to. 
+     */
+    public JavaEETestInjectorFactory(EntityManager aEntityManager, InjectorFactory aInjectorFactory) { 
+        entityManager = aEntityManager; 
+        delegate = aInjectorFactory;
+    }
+
+    /**
+     * Constructs the factory with the default injector factory obtained from 
+     * {@link InjectorFactoryBuilder#getInjector()}. 
+     * @param aEntityManager Contextual entity manager to inject. 
+     */
+    public JavaEETestInjectorFactory(EntityManager aEntityManager) {
+        this(aEntityManager,  getDefaultInjectorFactory());
+    }
+
+    private static InjectorFactory getDefaultInjectorFactory() {
+        InjectorFactoryBuilder.setInjectorFactory(null);
+        return InjectorFactoryBuilder.getInjectorFactory();
+    }
+
+    @Override
+    public Injector create(Class aClass) {
+        return new JavaEETestInjector(aClass, entityManager, delegate
+            .create(aClass));
+    }
+}