Creates DnsService interface and DnsOptions

gcloud-java-dns/src/main/java/com/google/gcloud/dns/AbstractOption.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2016 Google Inc. 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 com.google.gcloud.dns;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import com.google.common.base.MoreObjects;
+import com.google.gcloud.spi.DnsRpc;
+
+import java.io.Serializable;
+import java.util.Objects;
+
+/**
+ * A base class for options.
+ */
+abstract class AbstractOption implements Serializable {
+
+  private static final long serialVersionUID = -5912727967831484228L;
+  private final Object value;
+  private final DnsRpc.Option rpcOption;
+
+  AbstractOption(DnsRpc.Option rpcOption, Object value) {
+    this.rpcOption = checkNotNull(rpcOption);
+    this.value = value;
+  }
+
+  Object value() {
+    return value;
+  }
+
+  DnsRpc.Option rpcOption() {
+    return rpcOption;
+  }
+
+  @Override
+  public boolean equals(Object obj) {
+    if (!(obj instanceof AbstractOption)) {
+      return false;
+    }
+    AbstractOption other = (AbstractOption) obj;
+    return Objects.equals(value, other.value) && Objects.equals(rpcOption, other.rpcOption);
+  }
+
+  @Override
+  public int hashCode() {
+    return Objects.hash(value, rpcOption);
+  }
+
+  @Override
+  public String toString() {
+    return MoreObjects.toStringHelper(this)
+        .add("value", value)
+        .add("rpcOption", rpcOption)
+        .toString();
+  }
+}