91 lines
2.9 KiB
Java
91 lines
2.9 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.sql;
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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.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.sql.Time;
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import java.text.DateFormat;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.TimeZone;
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/**
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* Adapter for java.sql.Time. Although this class appears stateless, it is not. DateFormat captures
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* its time zone and locale when it is created, which gives this class state. DateFormat isn't
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* thread safe either, so this class has to synchronize its read and write methods.
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*/
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@SuppressWarnings("JavaUtilDate")
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final class SqlTimeTypeAdapter extends TypeAdapter<Time> {
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static final TypeAdapterFactory FACTORY =
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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
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public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> typeToken) {
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return typeToken.getRawType() == Time.class
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? (TypeAdapter<T>) new SqlTimeTypeAdapter()
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: null;
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}
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};
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private final DateFormat format = new SimpleDateFormat("hh:mm:ss a");
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private SqlTimeTypeAdapter() {}
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@Override
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public Time 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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String s = in.nextString();
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synchronized (this) {
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TimeZone originalTimeZone = format.getTimeZone(); // Save the original time zone
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try {
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Date date = format.parse(s);
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return new Time(date.getTime());
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} catch (ParseException e) {
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throw new JsonSyntaxException(
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"Failed parsing '" + s + "' as SQL Time; at path " + in.getPreviousPath(), e);
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} finally {
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format.setTimeZone(originalTimeZone); // Restore the original time zone
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}
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}
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}
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@Override
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public void write(JsonWriter out, Time 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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String timeString;
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synchronized (this) {
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timeString = format.format(value);
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}
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out.value(timeString);
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}
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}
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