Move gson to its own folder

[unical.git] / gson / com / google / gson / internal / bind / DateTypeAdapter.java

diff --git a/gson/com/google/gson/internal/bind/DateTypeAdapter.java b/gson/com/google/gson/internal/bind/DateTypeAdapter.java
new file mode 100644 (file)
index 0000000..f257172
--- /dev/null
+++ b/gson/com/google/gson/internal/bind/DateTypeAdapter.java
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2011 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.gson.internal.bind;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonSyntaxException;
+import com.google.gson.TypeAdapter;
+import com.google.gson.TypeAdapterFactory;
+import com.google.gson.reflect.TypeToken;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonToken;
+import com.google.gson.stream.JsonWriter;
+import java.io.IOException;
+import java.text.DateFormat;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Locale;
+import java.util.TimeZone;
+
+/**
+ * Adapter for Date. Although this class appears stateless, it is not.
+ * DateFormat captures its time zone and locale when it is created, which gives
+ * this class state. DateFormat isn't thread safe either, so this class has
+ * to synchronize its read and write methods.
+ */
+public final class DateTypeAdapter extends TypeAdapter<Date> {
+  public static final TypeAdapterFactory FACTORY = new TypeAdapterFactory() {
+    @SuppressWarnings("unchecked") // we use a runtime check to make sure the 'T's equal
+    public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) {
+      return typeToken.getRawType() == Date.class ? (TypeAdapter<T>) new DateTypeAdapter() : null;
+    }
+  };
+
+  private final DateFormat enUsFormat
+      = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.US);
+  private final DateFormat localFormat
+      = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT);
+  private final DateFormat iso8601Format = buildIso8601Format();
+
+  private static DateFormat buildIso8601Format() {
+    DateFormat iso8601Format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
+    iso8601Format.setTimeZone(TimeZone.getTimeZone("UTC"));
+    return iso8601Format;
+  }
+
+  @Override public Date read(JsonReader in) throws IOException {
+    if (in.peek() == JsonToken.NULL) {
+      in.nextNull();
+      return null;
+    }
+    return deserializeToDate(in.nextString());
+  }
+
+  private synchronized Date deserializeToDate(String json) {
+    try {
+      return localFormat.parse(json);
+    } catch (ParseException ignored) {
+    }
+    try {
+      return enUsFormat.parse(json);
+    } catch (ParseException ignored) {
+    }
+    try {
+      return iso8601Format.parse(json);
+    } catch (ParseException e) {
+      throw new JsonSyntaxException(json, e);
+    }
+  }
+
+  @Override public synchronized void write(JsonWriter out, Date value) throws IOException {
+    if (value == null) {
+      out.nullValue();
+      return;
+    }
+    String dateFormatAsString = enUsFormat.format(value);
+    out.value(dateFormatAsString);
+  }
+}