83 lines
2.7 KiB
Java
83 lines
2.7 KiB
Java
/*
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* Copyright (C) 2020 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.ToNumberPolicy;
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import com.google.gson.ToNumberStrategy;
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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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/** Type adapter for {@link Number}. */
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public final class NumberTypeAdapter extends TypeAdapter<Number> {
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/** Gson default factory using {@link ToNumberPolicy#LAZILY_PARSED_NUMBER}. */
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private static final TypeAdapterFactory LAZILY_PARSED_NUMBER_FACTORY =
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newFactory(ToNumberPolicy.LAZILY_PARSED_NUMBER);
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private final ToNumberStrategy toNumberStrategy;
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private NumberTypeAdapter(ToNumberStrategy toNumberStrategy) {
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this.toNumberStrategy = toNumberStrategy;
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}
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private static TypeAdapterFactory newFactory(ToNumberStrategy toNumberStrategy) {
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final NumberTypeAdapter adapter = new NumberTypeAdapter(toNumberStrategy);
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return new TypeAdapterFactory() {
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@SuppressWarnings("unchecked")
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@Override
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public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
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return type.getRawType() == Number.class ? (TypeAdapter<T>) adapter : null;
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}
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};
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}
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public static TypeAdapterFactory getFactory(ToNumberStrategy toNumberStrategy) {
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if (toNumberStrategy == ToNumberPolicy.LAZILY_PARSED_NUMBER) {
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return LAZILY_PARSED_NUMBER_FACTORY;
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} else {
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return newFactory(toNumberStrategy);
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}
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}
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@Override
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public Number read(JsonReader in) throws IOException {
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JsonToken jsonToken = in.peek();
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switch (jsonToken) {
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case NULL:
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in.nextNull();
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return null;
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case NUMBER:
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case STRING:
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return toNumberStrategy.readNumber(in);
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default:
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throw new JsonSyntaxException(
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"Expecting number, got: " + jsonToken + "; at path " + in.getPath());
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}
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}
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@Override
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public void write(JsonWriter out, Number value) throws IOException {
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out.value(value);
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}
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}
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