Allow varargs on @AutoFactory methods

Github: Fixes google/auto#326

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=130784801

3 files changed, 76 insertions, 0 deletions

diff --git a/factory/src/test/java/com/google/auto/factory/processor/AutoFactoryProcessorTest.java b/factory/src/test/java/com/google/auto/factory/processor/AutoFactoryProcessorTest.java
index bf172bc0..58228ee4 100644
--- a/factory/src/test/java/com/google/auto/factory/processor/AutoFactoryProcessorTest.java
+++ b/factory/src/test/java/com/google/auto/factory/processor/AutoFactoryProcessorTest.java
@@ -387,4 +387,12 @@ public class AutoFactoryProcessorTest {
             JavaFileObjects.forResource(
                 "expected/MultipleFactoriesConflictingParameterNamesFactory.java"));
   }
+
+  @Test public void factoryVarargs() {
+    assertThat(JavaFileObjects.forResource("good/SimpleClassVarargs.java"))
+        .processedWith(new AutoFactoryProcessor())
+        .compilesWithoutError()
+        .and()
+        .generatesSources(JavaFileObjects.forResource("expected/SimpleClassVarargsFactory.java"));
+  }
 }
diff --git a/factory/src/test/resources/expected/SimpleClassVarargsFactory.java b/factory/src/test/resources/expected/SimpleClassVarargsFactory.java
new file mode 100644
index 00000000..e8b13161
--- /dev/null
+++ b/factory/src/test/resources/expected/SimpleClassVarargsFactory.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2016 Google, Inc.
+ *
+ * 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 tests;
+
+import com.google.auto.factory.internal.Preconditions;
+import javax.annotation.Generated;
+import javax.inject.Inject;
+
+@Generated(
+    value = "com.google.auto.factory.processor.AutoFactoryProcessor",
+    comments = "https://github.com/google/auto/tree/master/factory"
+)
+final class SimpleClassVarargsFactory implements SimpleClassVarargs.InterfaceWithVarargs {
+  @Inject SimpleClassVarargsFactory() {}
+
+  SimpleClassVarargs create(String... args) {
+    return new SimpleClassVarargs(Preconditions.checkNotNull(args, 1));
+  }
+
+  @Override
+  public SimpleClassVarargs build(String... args) {
+    return create(args);
+  }
+}
diff --git a/factory/src/test/resources/good/SimpleClassVarargs.java b/factory/src/test/resources/good/SimpleClassVarargs.java
new file mode 100644
index 00000000..125f35eb
--- /dev/null
+++ b/factory/src/test/resources/good/SimpleClassVarargs.java
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2016 Google, Inc.
+ *
+ * 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 tests;
+
+import com.google.auto.factory.AutoFactory;
+
+@AutoFactory(implementing = SimpleClassVarargs.InterfaceWithVarargs.class)
+final class SimpleClassVarargs {
+  private final String[] args;
+
+  SimpleClassVarargs(String... args) {
+    this.args = args;
+  }
+
+  interface InterfaceWithVarargs {
+    SimpleClassVarargs build(String... args);
+  }
+}