| /* |
| * Copyright (C) 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.gson.internal.bind; |
| |
| import com.google.gson.JsonSyntaxException; |
| import com.google.gson.TypeAdapter; |
| import com.google.gson.TypeAdapterFactory; |
| import com.google.gson.internal.JavaVersion; |
| import com.google.gson.internal.PreJava9DateFormatProvider; |
| import com.google.gson.internal.bind.util.ISO8601Utils; |
| 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.ParsePosition; |
| import java.text.SimpleDateFormat; |
| import java.util.ArrayList; |
| import java.util.Date; |
| import java.util.List; |
| import java.util.Locale; |
| import java.util.Objects; |
| |
| /** |
| * This type adapter supports subclasses of date by defining a |
| * {@link DefaultDateTypeAdapter.DateType} and then using its {@code createAdapterFactory} |
| * methods. |
| * |
| * @author Inderjeet Singh |
| * @author Joel Leitch |
| */ |
| public final class DefaultDateTypeAdapter<T extends Date> extends TypeAdapter<T> { |
| private static final String SIMPLE_NAME = "DefaultDateTypeAdapter"; |
| |
| public static abstract class DateType<T extends Date> { |
| public static final DateType<Date> DATE = new DateType<Date>(Date.class) { |
| @Override protected Date deserialize(Date date) { |
| return date; |
| } |
| }; |
| |
| private final Class<T> dateClass; |
| |
| protected DateType(Class<T> dateClass) { |
| this.dateClass = dateClass; |
| } |
| |
| protected abstract T deserialize(Date date); |
| |
| private final TypeAdapterFactory createFactory(DefaultDateTypeAdapter<T> adapter) { |
| return TypeAdapters.newFactory(dateClass, adapter); |
| } |
| |
| public final TypeAdapterFactory createAdapterFactory(String datePattern) { |
| return createFactory(new DefaultDateTypeAdapter<>(this, datePattern)); |
| } |
| |
| public final TypeAdapterFactory createAdapterFactory(int style) { |
| return createFactory(new DefaultDateTypeAdapter<>(this, style)); |
| } |
| |
| public final TypeAdapterFactory createAdapterFactory(int dateStyle, int timeStyle) { |
| return createFactory(new DefaultDateTypeAdapter<>(this, dateStyle, timeStyle)); |
| } |
| |
| public final TypeAdapterFactory createDefaultsAdapterFactory() { |
| return createFactory(new DefaultDateTypeAdapter<>(this, DateFormat.DEFAULT, DateFormat.DEFAULT)); |
| } |
| } |
| |
| private final DateType<T> dateType; |
| |
| /** |
| * List of 1 or more different date formats used for de-serialization attempts. |
| * The first of them is used for serialization as well. |
| */ |
| private final List<DateFormat> dateFormats = new ArrayList<>(); |
| |
| private DefaultDateTypeAdapter(DateType<T> dateType, String datePattern) { |
| this.dateType = Objects.requireNonNull(dateType); |
| dateFormats.add(new SimpleDateFormat(datePattern, Locale.US)); |
| if (!Locale.getDefault().equals(Locale.US)) { |
| dateFormats.add(new SimpleDateFormat(datePattern)); |
| } |
| } |
| |
| private DefaultDateTypeAdapter(DateType<T> dateType, int style) { |
| this.dateType = Objects.requireNonNull(dateType); |
| dateFormats.add(DateFormat.getDateInstance(style, Locale.US)); |
| if (!Locale.getDefault().equals(Locale.US)) { |
| dateFormats.add(DateFormat.getDateInstance(style)); |
| } |
| if (JavaVersion.isJava9OrLater()) { |
| dateFormats.add(PreJava9DateFormatProvider.getUSDateFormat(style)); |
| } |
| } |
| |
| private DefaultDateTypeAdapter(DateType<T> dateType, int dateStyle, int timeStyle) { |
| this.dateType = Objects.requireNonNull(dateType); |
| dateFormats.add(DateFormat.getDateTimeInstance(dateStyle, timeStyle, Locale.US)); |
| if (!Locale.getDefault().equals(Locale.US)) { |
| dateFormats.add(DateFormat.getDateTimeInstance(dateStyle, timeStyle)); |
| } |
| if (JavaVersion.isJava9OrLater()) { |
| dateFormats.add(PreJava9DateFormatProvider.getUSDateTimeFormat(dateStyle, timeStyle)); |
| } |
| } |
| |
| // These methods need to be synchronized since JDK DateFormat classes are not thread-safe |
| // See issue 162 |
| @Override |
| public void write(JsonWriter out, Date value) throws IOException { |
| if (value == null) { |
| out.nullValue(); |
| return; |
| } |
| |
| DateFormat dateFormat = dateFormats.get(0); |
| String dateFormatAsString; |
| synchronized (dateFormats) { |
| dateFormatAsString = dateFormat.format(value); |
| } |
| out.value(dateFormatAsString); |
| } |
| |
| @Override |
| public T read(JsonReader in) throws IOException { |
| if (in.peek() == JsonToken.NULL) { |
| in.nextNull(); |
| return null; |
| } |
| Date date = deserializeToDate(in); |
| return dateType.deserialize(date); |
| } |
| |
| private Date deserializeToDate(JsonReader in) throws IOException { |
| String s = in.nextString(); |
| synchronized (dateFormats) { |
| for (DateFormat dateFormat : dateFormats) { |
| try { |
| return dateFormat.parse(s); |
| } catch (ParseException ignored) {} |
| } |
| } |
| |
| try { |
| return ISO8601Utils.parse(s, new ParsePosition(0)); |
| } catch (ParseException e) { |
| throw new JsonSyntaxException("Failed parsing '" + s + "' as Date; at path " + in.getPreviousPath(), e); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| DateFormat defaultFormat = dateFormats.get(0); |
| if (defaultFormat instanceof SimpleDateFormat) { |
| return SIMPLE_NAME + '(' + ((SimpleDateFormat) defaultFormat).toPattern() + ')'; |
| } else { |
| return SIMPLE_NAME + '(' + defaultFormat.getClass().getSimpleName() + ')'; |
| } |
| } |
| } |