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/FeeCheckCommandExtensionV12.java

@@ -0,0 +1,69 @@
+// 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 static google.registry.util.CollectionUtils.nullToEmptyImmutableCopy;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableSet;
+import google.registry.model.ImmutableObject;
+import google.registry.model.domain.fee.FeeCheckCommandExtension;
+import google.registry.model.domain.fee.FeeCheckResponseExtensionItem;
+import java.util.Set;
+import javax.xml.bind.annotation.XmlElement;
+import javax.xml.bind.annotation.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+import org.joda.money.CurrencyUnit;
+
+/** Version 0.12 of the fee extension that may be present on domain check commands. */
+@XmlRootElement(name = "check")
+@XmlType(propOrder = {"currency", "items"})
+public class FeeCheckCommandExtensionV12 extends ImmutableObject
+    implements FeeCheckCommandExtension<
+        FeeCheckCommandExtensionItemV12,
+        FeeCheckResponseExtensionV12> {
+
+  CurrencyUnit currency;
+  
+  @Override
+  public boolean isCurrencySupported() {
+    return true;
+  }
+
+  @Override
+  public CurrencyUnit getCurrency() {
+    return currency;
+  }
+  
+  @XmlElement(name = "command")
+  Set<FeeCheckCommandExtensionItemV12> items;
+
+  @Override
+  public ImmutableSet<FeeCheckCommandExtensionItemV12> getItems() {
+    return nullToEmptyImmutableCopy(items);
+  }
+
+  @Override
+  public FeeCheckResponseExtensionV12 createResponse(
+      ImmutableList<? extends FeeCheckResponseExtensionItem> items) {
+    ImmutableList.Builder<FeeCheckResponseExtensionItemV12> builder = new ImmutableList.Builder<>();
+    for (FeeCheckResponseExtensionItem item : items) {
+      if (item instanceof FeeCheckResponseExtensionItemV12) {
+        builder.add((FeeCheckResponseExtensionItemV12) item);
+      }
+    }
+    return FeeCheckResponseExtensionV12.create(currency, builder.build());
+  }
+}