[JAMES-3836] implements guice bindings for JPAMailRepository
diff --git a/server/container/guice/jpa-common/src/main/java/org/apache/james/modules/data/JPAMailRepositoryModule.java b/server/container/guice/jpa-common/src/main/java/org/apache/james/modules/data/JPAMailRepositoryModule.java
index 99ac66d..bb6a0ff 100644
--- a/server/container/guice/jpa-common/src/main/java/org/apache/james/modules/data/JPAMailRepositoryModule.java
+++ b/server/container/guice/jpa-common/src/main/java/org/apache/james/modules/data/JPAMailRepositoryModule.java
@@ -20,15 +20,18 @@
 package org.apache.james.modules.data;
 
 import org.apache.commons.configuration2.BaseHierarchicalConfiguration;
+import org.apache.james.mailrepository.api.MailRepositoryFactory;
 import org.apache.james.mailrepository.api.MailRepositoryUrlStore;
 import org.apache.james.mailrepository.api.Protocol;
 import org.apache.james.mailrepository.jpa.JPAMailRepository;
+import org.apache.james.mailrepository.jpa.JPAMailRepositoryFactory;
 import org.apache.james.mailrepository.jpa.JPAMailRepositoryUrlStore;
 import org.apache.james.mailrepository.memory.MailRepositoryStoreConfiguration;
 
 import com.google.common.collect.ImmutableList;
 import com.google.inject.AbstractModule;
 import com.google.inject.Scopes;
+import com.google.inject.multibindings.Multibinder;
 
 public class JPAMailRepositoryModule extends AbstractModule {
 
@@ -43,5 +46,8 @@
                 ImmutableList.of(new Protocol("jpa")),
                 JPAMailRepository.class.getName(),
                 new BaseHierarchicalConfiguration()));
+
+        Multibinder.newSetBinder(binder(), MailRepositoryFactory.class)
+                .addBinding().to(JPAMailRepositoryFactory.class);
     }
 }
diff --git a/server/data/data-jpa/src/main/java/org/apache/james/mailrepository/jpa/JPAMailRepository.java b/server/data/data-jpa/src/main/java/org/apache/james/mailrepository/jpa/JPAMailRepository.java
index 702b661..575592e 100644
--- a/server/data/data-jpa/src/main/java/org/apache/james/mailrepository/jpa/JPAMailRepository.java
+++ b/server/data/data-jpa/src/main/java/org/apache/james/mailrepository/jpa/JPAMailRepository.java
@@ -87,6 +87,15 @@
         this.entityManagerFactory = entityManagerFactory;
     }
 
+    public JPAMailRepository(EntityManagerFactory entityManagerFactory, MailRepositoryUrl url) throws ConfigurationException {
+        this.entityManagerFactory = entityManagerFactory;
+        this.repositoryName = url.getPath().asString();
+        if (repositoryName.isEmpty()) {
+            throw new ConfigurationException(
+                    "Malformed destinationURL - Must be of the format 'jpa://<repositoryName>'.  Was passed " + url);
+        }
+    }
+
     public String getRepositoryName() {
         return repositoryName;
     }
diff --git a/server/data/data-jpa/src/main/java/org/apache/james/mailrepository/jpa/JPAMailRepositoryFactory.java b/server/data/data-jpa/src/main/java/org/apache/james/mailrepository/jpa/JPAMailRepositoryFactory.java
new file mode 100644
index 0000000..09bb004
--- /dev/null
+++ b/server/data/data-jpa/src/main/java/org/apache/james/mailrepository/jpa/JPAMailRepositoryFactory.java
@@ -0,0 +1,52 @@
+/****************************************************************
+ * 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.james.mailrepository.jpa;
+
+import javax.inject.Inject;
+import javax.persistence.EntityManagerFactory;
+
+import org.apache.james.mailrepository.api.MailRepository;
+import org.apache.james.mailrepository.api.MailRepositoryFactory;
+import org.apache.james.mailrepository.api.MailRepositoryUrl;
+
+import com.github.fge.lambdas.Throwing;
+
+public class JPAMailRepositoryFactory implements MailRepositoryFactory {
+    private final EntityManagerFactory entityManagerFactory;
+
+    @Inject
+    public JPAMailRepositoryFactory(EntityManagerFactory entityManagerFactory) {
+        this.entityManagerFactory = entityManagerFactory;
+    }
+
+    @Override
+    public Class<? extends MailRepository> mailRepositoryClass() {
+        return JPAMailRepository.class;
+    }
+
+    @Override
+    public MailRepository create(MailRepositoryUrl url) {
+        // Injecting the url here is redundant since the class is also a
+        // Configurable and the mail repository store will call #configure()
+        // with the same effect. However, this paves the way to drop the
+        // Configurable aspect in the future.
+        return Throwing.supplier(() -> new JPAMailRepository(entityManagerFactory, url)).sneakyThrow().get();
+    }
+}