Support version 0.12 of the EPP Fee Extension

The corresponding version of the specification is 8.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=127968603

java/google/registry/model/domain/fee12/FeeCheckResponseExtensionV12.java

@@ -0,0 +1,59 @@
+// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
+//
+// 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 google.registry.model.domain.fee12;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.collect.ImmutableList;
+import google.registry.model.ImmutableObject;
+import google.registry.model.domain.fee.FeeCheckResponseExtension;
+import javax.xml.bind.annotation.XmlElement;
+import javax.xml.bind.annotation.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+import org.joda.money.CurrencyUnit;
+
+/**
+ * An XML data object that represents version 0.12 of the fee extension that may be present on the 
+ * response to EPP domain check commands.
+ */
+@XmlRootElement(name = "chkData")
+@XmlType(propOrder = {"currency", "items"})
+public class FeeCheckResponseExtensionV12
+    extends ImmutableObject implements FeeCheckResponseExtension<FeeCheckResponseExtensionItemV12> {
+
+  CurrencyUnit currency;
+  
+  /** Check responses. */
+  @XmlElement(name = "cd")
+  ImmutableList<FeeCheckResponseExtensionItemV12> items;
+
+  @Override
+  public void setCurrencyIfSupported(CurrencyUnit currency) {
+    this.currency = currency;
+  }
+
+  @VisibleForTesting
+  @Override
+  public ImmutableList<FeeCheckResponseExtensionItemV12> getItems() {
+    return items;
+  }
+
+  static FeeCheckResponseExtensionV12
+      create(CurrencyUnit currency, ImmutableList<FeeCheckResponseExtensionItemV12> items) {
+    FeeCheckResponseExtensionV12 instance = new FeeCheckResponseExtensionV12();
+    instance.currency = currency;
+    instance.items = items;
+    return instance;
+  }
+}