mv com/google/domain/registry google/registry

This change renames directories in preparation for the great package
rename. The repository is now in a broken state because the code
itself hasn't been updated. However this should ensure that git
correctly preserves history for each file.

java/google/registry/model/eppcommon/Trid.java

@@ -0,0 +1,85 @@
+// 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 com.google.domain.registry.model.eppcommon;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.io.BaseEncoding;
+import com.google.domain.registry.model.ImmutableObject;
+
+import com.googlecode.objectify.annotation.Embed;
+
+import java.nio.ByteBuffer;
+import java.util.UUID;
+import java.util.concurrent.atomic.AtomicLong;
+
+import javax.xml.bind.annotation.XmlElement;
+import javax.xml.bind.annotation.XmlType;
+
+/**
+ * "A {@code TRID} (transaction identifier) element containing the transaction identifier assigned
+ * by the server to the command for which the response is being returned. The transaction identifier
+ * is formed using the {@code clTRID} associated with the command if supplied by the client and a
+ * {@code svTRID} (server transaction identifier) that is assigned by and unique to the server."
+ */
+@Embed
+@XmlType(propOrder = {"clientTransactionId", "serverTransactionId"})
+public class Trid extends ImmutableObject {
+
+  private static final String SERVER_ID = getServerId();
+  private static final AtomicLong COUNTER = new AtomicLong();
+
+  /** Creates a unique id for this server instance, as a base64 encoded UUID. */
+  private static String getServerId() {
+    UUID uuid = UUID.randomUUID();
+    ByteBuffer buffer = ByteBuffer.allocate(16);
+    buffer.asLongBuffer()
+        .put(0, uuid.getMostSignificantBits())
+        .put(1, uuid.getLeastSignificantBits());
+    return BaseEncoding.base64().encode(buffer.array());
+  }
+
+  /** The server transaction id. */
+  @XmlElement(name = "svTRID", namespace = "urn:ietf:params:xml:ns:epp-1.0")
+  String serverTransactionId;
+
+  /** The client transaction id, if provided by the client, otherwise null. */
+  @XmlElement(name = "clTRID", namespace = "urn:ietf:params:xml:ns:epp-1.0")
+  String clientTransactionId;
+
+  public String getServerTransactionId() {
+    return serverTransactionId;
+  }
+
+  public String getClientTransactionId() {
+    return clientTransactionId;
+  }
+
+  public static Trid create(String clientTransactionId) {
+    Trid instance = new Trid();
+    instance.clientTransactionId = clientTransactionId;
+    // The server id can be at most 64 characters. The SERVER_ID is at most 22 characters (128 bits
+    // in base64), plus the dash. That leaves 41 characters, so we just append the counter in hex.
+    instance.serverTransactionId = String.format("%s-%x", SERVER_ID, COUNTER.incrementAndGet());
+    return instance;
+  }
+
+  @VisibleForTesting
+  public static Trid create(String clientTransactionId, String serverTransactionId) {
+    Trid instance = new Trid();
+    instance.clientTransactionId = clientTransactionId;
+    instance.serverTransactionId = serverTransactionId;
+    return instance;
+  }
+}