Import code from internal repository to git

java/com/google/domain/registry/xml/UtcDateTimeAdapter.java

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+// 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.domain.registry.xml;
+
+import static com.google.common.base.Strings.isNullOrEmpty;
+import static org.joda.time.DateTimeZone.UTC;
+
+import org.joda.time.DateTime;
+import org.joda.time.format.DateTimeFormatter;
+import org.joda.time.format.ISODateTimeFormat;
+
+import javax.annotation.CheckForNull;
+import javax.annotation.Nullable;
+import javax.xml.bind.annotation.adapters.XmlAdapter;
+
+/**
+ * Adapter to use Joda {@link DateTime} when marshalling XML timestamps.
+ *
+ * <p>These fields shall contain timestamps indicating the date and time in UTC as specified in
+ * RFC3339, with no offset from the zero meridian. For example: {@code 2010-10-17T00:00:00Z}.
+ */
+public class UtcDateTimeAdapter extends XmlAdapter<String, DateTime> {
+
+  /** @see ISODateTimeFormat#dateTimeNoMillis */
+  private static final DateTimeFormatter MARSHAL_FORMAT = ISODateTimeFormat.dateTimeNoMillis();
+
+  /** @see ISODateTimeFormat#dateTimeParser */
+  private static final DateTimeFormatter UNMARSHAL_FORMAT = ISODateTimeFormat.dateTimeParser();
+
+  /** Same as {@link #marshal(DateTime)}, but in a convenient static format. */
+  public static String getFormattedString(@Nullable DateTime timestamp) {
+    if (timestamp == null) {
+      return "";
+    }
+    return MARSHAL_FORMAT.print(timestamp.toDateTime(UTC));
+  }
+
+  /**
+   * Parses an ISO timestamp string into a UTC {@link DateTime} object, converting timezones if
+   * necessary. If {@code timestamp} is empty or {@code null} then {@code null} is returned.
+   */
+  @Nullable
+  @CheckForNull
+  @Override
+  public DateTime unmarshal(@Nullable String timestamp) {
+    if (isNullOrEmpty(timestamp)) {
+      return null;
+    }
+    return UNMARSHAL_FORMAT.parseDateTime(timestamp).withZone(UTC);
+  }
+
+  /**
+   * Converts {@link DateTime} to UTC and returns it as an RFC3339 string. If {@code timestamp} is
+   * {@code null} then an empty string is returned.
+   */
+  @Override
+  public String marshal(@Nullable DateTime timestamp) {
+    return getFormattedString(timestamp);
+  }
+}