Import code from internal repository to git

java/com/google/domain/registry/xml/DateAdapter.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.LocalDate;
+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 LocalDate} when marshalling the XML Schema {@code date} type.
+ *
+ * <p>Dates are represented as midnight in UTC. The parser aims to be permissive in what it accepts.
+ * Timestamps are converted to UTC if a zone is specified and then the time section is truncated.
+ * This can lead to unexpected behavior, but it will be your fault.
+ */
+public class DateAdapter extends XmlAdapter<String, LocalDate> {
+
+  /** @see ISODateTimeFormat#date */
+  private static final DateTimeFormatter MARSHAL_FORMAT = ISODateTimeFormat.date();
+
+  /** @see ISODateTimeFormat#dateTimeParser */
+  private static final DateTimeFormatter UNMARSHAL_FORMAT = ISODateTimeFormat.dateTimeParser();
+
+  /**
+   * Parses an ISO timestamp string into a UTC {@link LocalDate} object, converting timezones
+   * and truncating time to midnight if necessary. If {@code timestamp} is empty or {@code null}
+   * then {@code null} is returned.
+   */
+  @Nullable
+  @CheckForNull
+  @Override
+  public LocalDate unmarshal(@Nullable String timestamp) {
+    if (isNullOrEmpty(timestamp)) {
+      return null;
+    }
+    return UNMARSHAL_FORMAT.parseDateTime(timestamp).withZone(UTC).toLocalDate();
+  }
+
+  /**
+   * Converts {@link LocalDate} 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 LocalDate date) {
+    if (date == null) {
+      return "";
+    }
+    return MARSHAL_FORMAT.print(date.toDateTimeAtStartOfDay(UTC));
+  }
+}