Copy SqlTimestampDeserializer from gwtjsonrpc

Keep package-private in the json package so it can be used by all Gson
instances created by OutputFormat. Also copy in JavaSqlTimestampHelper,
which is a dependency.

Change-Id: Ib9d31d346dbf2fd28b8fc78e425c0bf81a2fe9a6

java/com/google/gerrit/json/JavaSqlTimestampHelper.java

@@ -0,0 +1,108 @@
+// Copyright 2008 Google Inc.
+//
+// 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.gerrit.json;
+
+import java.sql.Timestamp;
+import java.util.Date;
+
+/** Utility to parse Timestamp from a string. */
+public class JavaSqlTimestampHelper {
+  /**
+   * Parse a string into a timestamp.
+   *
+   * <p>Note that {@link Timestamp}s have no timezone, so the result is relative to the UTC epoch.
+   *
+   * <p>Supports the format {@code yyyy-MM-dd[ HH:mm:ss[.SSS][ Z]]} where {@code Z} is a 4-digit
+   * offset with sign, e.g. {@code -0500}.
+   *
+   * @param s input string.
+   * @return resulting timestamp.
+   */
+  public static Timestamp parseTimestamp(String s) {
+    String[] components = s.split(" ");
+    if (components.length < 1 || components.length > 3) {
+      throw new IllegalArgumentException("Expected date and optional time: " + s);
+    }
+    String date = components[0];
+    String time = components.length >= 2 ? components[1] : null;
+    int off = components.length == 3 ? parseTimeZone(components[2]) : 0;
+    String[] dSplit = date.split("-");
+    if (dSplit.length != 3) {
+      throw new IllegalArgumentException("Invalid date format: " + date);
+    }
+    int yy, mm, dd;
+    try {
+      yy = Integer.parseInt(dSplit[0]) - 1900;
+      mm = Integer.parseInt(dSplit[1]) - 1;
+      dd = Integer.parseInt(dSplit[2]);
+    } catch (NumberFormatException e) {
+      throw new IllegalArgumentException("Invalid date format: " + date, e);
+    }
+
+    int hh, mi, ss, ns;
+    if (time != null) {
+      int p = time.indexOf('.');
+      String t;
+      double f;
+      try {
+        if (p >= 0) {
+          t = time.substring(0, p);
+          f = Double.parseDouble("0." + time.substring(p + 1));
+        } else {
+          t = time;
+          f = 0;
+        }
+        String[] tSplit = t.split(":");
+        if (tSplit.length != 3) {
+          throw new IllegalArgumentException("Invalid time format: " + time);
+        }
+        hh = Integer.parseInt(tSplit[0]);
+        mi = Integer.parseInt(tSplit[1]);
+        ss = Integer.parseInt(tSplit[2]);
+        ns = (int) Math.round(f * 1e9);
+      } catch (NumberFormatException e) {
+        throw new IllegalArgumentException("Invalid time format: " + time, e);
+      }
+    } else {
+      hh = 0;
+      mi = 0;
+      ss = 0;
+      ns = 0;
+    }
+    @SuppressWarnings("deprecation")
+    Timestamp result = new Timestamp(Date.UTC(yy, mm, dd, hh, mi, ss) - off);
+    result.setNanos(ns);
+    return result;
+  }
+
+  private static int parseTimeZone(String s) {
+    if (s.length() != 5 || (s.charAt(0) != '-' && s.charAt(0) != '+')) {
+      throw new IllegalArgumentException("Invalid time zone: " + s);
+    }
+    for (int i = 1; i < s.length(); i++) {
+      if (s.charAt(i) < '0' || s.charAt(i) > '9') {
+        throw new IllegalArgumentException("Invalid time zone: " + s);
+      }
+    }
+    int off =
+        (s.charAt(0) == '-' ? -1 : 1)
+            * 60
+            * 1000
+            * ((60 * Integer.parseInt(s.substring(1, 3))) + Integer.parseInt(s.substring(3, 5)));
+    return off;
+  }
+
+  private JavaSqlTimestampHelper() {}
+}

java/com/google/gerrit/json/OutputFormat.java

@@ -17,7 +17,6 @@ package com.google.gerrit.json;
 import com.google.gson.FieldNamingPolicy;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
-import com.google.gwtjsonrpc.server.SqlTimestampDeserializer;
 import java.sql.Timestamp;
 
 /** Standard output format used by an API call. */

java/com/google/gerrit/json/SqlTimestampDeserializer.java

@@ -0,0 +1,66 @@
+// Copyright 2008 Google Inc.
+//
+// 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.gerrit.json;
+
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonNull;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonPrimitive;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
+import java.lang.reflect.Type;
+import java.text.SimpleDateFormat;
+import java.util.TimeZone;
+
+class SqlTimestampDeserializer
+    implements JsonDeserializer<java.sql.Timestamp>, JsonSerializer<java.sql.Timestamp> {
+  private static final TimeZone UTC = TimeZone.getTimeZone("UTC");
+
+  @Override
+  public java.sql.Timestamp deserialize(
+      final JsonElement json, final Type typeOfT, final JsonDeserializationContext context)
+      throws JsonParseException {
+    if (json.isJsonNull()) {
+      return null;
+    }
+    if (!json.isJsonPrimitive()) {
+      throw new JsonParseException("Expected string for timestamp type");
+    }
+    final JsonPrimitive p = (JsonPrimitive) json;
+    if (!p.isString()) {
+      throw new JsonParseException("Expected string for timestamp type");
+    }
+
+    return JavaSqlTimestampHelper.parseTimestamp(p.getAsString());
+  }
+
+  @Override
+  public JsonElement serialize(
+      final java.sql.Timestamp src, final Type typeOfSrc, final JsonSerializationContext context) {
+    if (src == null) {
+      return new JsonNull();
+    }
+    return new JsonPrimitive(newFormat().format(src) + "000000");
+  }
+
+  private static SimpleDateFormat newFormat() {
+    final SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
+    f.setTimeZone(UTC);
+    f.setLenient(true);
+    return f;
+  }
+}

javatests/com/google/gerrit/json/BUILD

@@ -0,0 +1,11 @@
+load("//tools/bzl:junit.bzl", "junit_tests")
+
+junit_tests(
+    name = "json_tests",
+    srcs = glob(["*.java"]),
+    deps = [
+        "//java/com/google/gerrit/json",
+        "//lib:guava",
+        "//lib/truth",
+    ],
+)

javatests/com/google/gerrit/json/JavaSqlTimestampHelperTest.java

@@ -0,0 +1,87 @@
+// Copyright (C) 2014 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.gerrit.json;
+
+import static com.google.common.truth.Truth.assertThat;
+import static com.google.common.truth.Truth.assert_;
+import static com.google.gerrit.json.JavaSqlTimestampHelper.parseTimestamp;
+
+import java.text.SimpleDateFormat;
+import java.util.TimeZone;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+public class JavaSqlTimestampHelperTest {
+  private SimpleDateFormat format;
+  private TimeZone systemTimeZone;
+
+  @Before
+  public void setUp() throws Exception {
+    synchronized (TimeZone.class) {
+      systemTimeZone = TimeZone.getDefault();
+      TimeZone.setDefault(TimeZone.getTimeZone("GMT-5:00"));
+      format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS Z");
+    }
+  }
+
+  @After
+  public void resetTimeZone() {
+    TimeZone.setDefault(systemTimeZone);
+  }
+
+  @Test
+  public void parseFullTimestamp() {
+    assertThat(reformat("2006-01-02 20:04:05.789000000"))
+        .isEqualTo("2006-01-02 15:04:05.789 -0500");
+    assertThat(reformat("2006-01-02 20:04:05")).isEqualTo("2006-01-02 15:04:05.000 -0500");
+  }
+
+  @Test
+  public void parseDateOnly() {
+    assertThat(reformat("2006-01-02")).isEqualTo("2006-01-01 19:00:00.000 -0500");
+  }
+
+  @Test
+  public void parseTimeZone() {
+    assertThat(reformat("2006-01-02 15:04:05.789 -0100"))
+        .isEqualTo("2006-01-02 11:04:05.789 -0500");
+    assertThat(reformat("2006-01-02 15:04:05.789 -0000"))
+        .isEqualTo("2006-01-02 10:04:05.789 -0500");
+    assertThat(reformat("2006-01-02 15:04:05.789 +0100"))
+        .isEqualTo("2006-01-02 09:04:05.789 -0500");
+  }
+
+  @Test
+  public void parseInvalidTimestamps() {
+    assertInvalid("2006-01-02-15:04:05.789000000");
+    assertInvalid("2006-01-02T15:04:05.789000000");
+    assertInvalid("15:04:05");
+    assertInvalid("15:04:05.999000000");
+  }
+
+  private static void assertInvalid(String input) {
+    try {
+      parseTimestamp(input);
+      assert_().fail("Expected IllegalArgumentException for: " + input);
+    } catch (IllegalArgumentException e) {
+      // Expected;
+    }
+  }
+
+  private String reformat(String input) {
+    return format.format(parseTimestamp(input));
+  }
+}