108 lines
3.7 KiB
Java
108 lines
3.7 KiB
Java
/*
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* Copyright (C) 2011 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.gson.internal.bind;
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import com.google.gson.Gson;
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import com.google.gson.JsonSyntaxException;
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import com.google.gson.TypeAdapter;
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import com.google.gson.TypeAdapterFactory;
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import com.google.gson.internal.JavaVersion;
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import com.google.gson.internal.PreJava9DateFormatProvider;
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import com.google.gson.internal.bind.util.ISO8601Utils;
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import com.google.gson.reflect.TypeToken;
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import com.google.gson.stream.JsonReader;
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import com.google.gson.stream.JsonToken;
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import com.google.gson.stream.JsonWriter;
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import java.io.IOException;
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import java.text.DateFormat;
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import java.text.ParseException;
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import java.text.ParsePosition;
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import java.util.ArrayList;
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import java.util.Date;
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import java.util.List;
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import java.util.Locale;
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/**
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* Adapter for Date. Although this class appears stateless, it is not.
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* DateFormat captures its time zone and locale when it is created, which gives
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* this class state. DateFormat isn't thread safe either, so this class has
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* to synchronize its read and write methods.
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*/
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public final class DateTypeAdapter extends TypeAdapter<Date> {
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public static final TypeAdapterFactory FACTORY = new TypeAdapterFactory() {
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@SuppressWarnings("unchecked") // we use a runtime check to make sure the 'T's equal
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@Override public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) {
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return typeToken.getRawType() == Date.class ? (TypeAdapter<T>) new DateTypeAdapter() : null;
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}
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};
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/**
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* List of 1 or more different date formats used for de-serialization attempts.
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* The first of them (default US format) is used for serialization as well.
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*/
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private final List<DateFormat> dateFormats = new ArrayList<>();
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public DateTypeAdapter() {
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dateFormats.add(DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.US));
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if (!Locale.getDefault().equals(Locale.US)) {
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dateFormats.add(DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT));
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}
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if (JavaVersion.isJava9OrLater()) {
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dateFormats.add(PreJava9DateFormatProvider.getUSDateTimeFormat(DateFormat.DEFAULT, DateFormat.DEFAULT));
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}
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}
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@Override public Date read(JsonReader in) throws IOException {
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if (in.peek() == JsonToken.NULL) {
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in.nextNull();
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return null;
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}
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return deserializeToDate(in);
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}
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private Date deserializeToDate(JsonReader in) throws IOException {
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String s = in.nextString();
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synchronized (dateFormats) {
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for (DateFormat dateFormat : dateFormats) {
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try {
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return dateFormat.parse(s);
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} catch (ParseException ignored) {}
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}
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}
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try {
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return ISO8601Utils.parse(s, new ParsePosition(0));
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} catch (ParseException e) {
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throw new JsonSyntaxException("Failed parsing '" + s + "' as Date; at path " + in.getPreviousPath(), e);
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}
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}
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@Override public void write(JsonWriter out, Date value) throws IOException {
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if (value == null) {
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out.nullValue();
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return;
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}
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DateFormat dateFormat = dateFormats.get(0);
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String dateFormatAsString;
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synchronized (dateFormats) {
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dateFormatAsString = dateFormat.format(value);
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}
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out.value(dateFormatAsString);
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}
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}
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