135 lines
5.5 KiB
Java
135 lines
5.5 KiB
Java
/*
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* Copyright (C) 2021 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.functional;
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import java.lang.reflect.Type;
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import java.math.BigDecimal;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.LinkedList;
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import java.util.List;
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import com.google.gson.Gson;
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import com.google.gson.GsonBuilder;
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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.internal.LazilyParsedNumber;
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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 junit.framework.TestCase;
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public class ToNumberPolicyFunctionalTest extends TestCase {
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public void testDefault() {
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Gson gson = new Gson();
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assertEquals(null, gson.fromJson("null", Object.class));
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assertEquals(10D, gson.fromJson("10", Object.class));
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assertEquals(null, gson.fromJson("null", Number.class));
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assertEquals(new LazilyParsedNumber("10"), gson.fromJson("10", Number.class));
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}
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public void testAsDoubles() {
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Gson gson = new GsonBuilder()
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.setObjectToNumberStrategy(ToNumberPolicy.DOUBLE)
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.setNumberToNumberStrategy(ToNumberPolicy.DOUBLE)
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.create();
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assertEquals(null, gson.fromJson("null", Object.class));
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assertEquals(10.0, gson.fromJson("10", Object.class));
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assertEquals(null, gson.fromJson("null", Number.class));
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assertEquals(10.0, gson.fromJson("10", Number.class));
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}
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public void testAsLazilyParsedNumbers() {
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Gson gson = new GsonBuilder()
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.setObjectToNumberStrategy(ToNumberPolicy.LAZILY_PARSED_NUMBER)
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.setNumberToNumberStrategy(ToNumberPolicy.LAZILY_PARSED_NUMBER)
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.create();
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assertEquals(null, gson.fromJson("null", Object.class));
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assertEquals(new LazilyParsedNumber("10"), gson.fromJson("10", Object.class));
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assertEquals(null, gson.fromJson("null", Number.class));
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assertEquals(new LazilyParsedNumber("10"), gson.fromJson("10", Number.class));
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}
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public void testAsLongsOrDoubles() {
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Gson gson = new GsonBuilder()
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.setObjectToNumberStrategy(ToNumberPolicy.LONG_OR_DOUBLE)
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.setNumberToNumberStrategy(ToNumberPolicy.LONG_OR_DOUBLE)
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.create();
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assertEquals(null, gson.fromJson("null", Object.class));
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assertEquals(10L, gson.fromJson("10", Object.class));
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assertEquals(10.0, gson.fromJson("10.0", Object.class));
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assertEquals(null, gson.fromJson("null", Number.class));
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assertEquals(10L, gson.fromJson("10", Number.class));
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assertEquals(10.0, gson.fromJson("10.0", Number.class));
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}
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public void testAsBigDecimals() {
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Gson gson = new GsonBuilder()
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.setObjectToNumberStrategy(ToNumberPolicy.BIG_DECIMAL)
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.setNumberToNumberStrategy(ToNumberPolicy.BIG_DECIMAL)
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.create();
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assertEquals(null, gson.fromJson("null", Object.class));
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assertEquals(new BigDecimal("10"), gson.fromJson("10", Object.class));
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assertEquals(new BigDecimal("10.0"), gson.fromJson("10.0", Object.class));
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assertEquals(null, gson.fromJson("null", Number.class));
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assertEquals(new BigDecimal("10"), gson.fromJson("10", Number.class));
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assertEquals(new BigDecimal("10.0"), gson.fromJson("10.0", Number.class));
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assertEquals(new BigDecimal("3.141592653589793238462643383279"), gson.fromJson("3.141592653589793238462643383279", BigDecimal.class));
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assertEquals(new BigDecimal("1e400"), gson.fromJson("1e400", BigDecimal.class));
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}
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public void testAsListOfLongsOrDoubles() {
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Gson gson = new GsonBuilder()
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.setObjectToNumberStrategy(ToNumberPolicy.LONG_OR_DOUBLE)
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.setNumberToNumberStrategy(ToNumberPolicy.LONG_OR_DOUBLE)
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.create();
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List<Object> expected = new LinkedList<>();
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expected.add(null);
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expected.add(10L);
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expected.add(10.0);
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Type objectCollectionType = new TypeToken<Collection<Object>>() { }.getType();
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Collection<Object> objects = gson.fromJson("[null,10,10.0]", objectCollectionType);
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assertEquals(expected, objects);
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Type numberCollectionType = new TypeToken<Collection<Number>>() { }.getType();
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Collection<Object> numbers = gson.fromJson("[null,10,10.0]", numberCollectionType);
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assertEquals(expected, numbers);
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}
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public void testCustomStrategiesCannotAffectConcreteDeclaredNumbers() {
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ToNumberStrategy fail = new ToNumberStrategy() {
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@Override
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public Byte readNumber(JsonReader in) {
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throw new UnsupportedOperationException();
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}
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};
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Gson gson = new GsonBuilder()
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.setObjectToNumberStrategy(fail)
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.setNumberToNumberStrategy(fail)
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.create();
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List<Object> numbers = gson.fromJson("[null, 10, 20, 30]", new TypeToken<List<Byte>>() {}.getType());
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assertEquals(Arrays.asList(null, (byte) 10, (byte) 20, (byte) 30), numbers);
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try {
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gson.fromJson("[null, 10, 20, 30]", new TypeToken<List<Object>>() {}.getType());
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fail();
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} catch (UnsupportedOperationException ex) {
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}
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try {
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gson.fromJson("[null, 10, 20, 30]", new TypeToken<List<Number>>() {}.getType());
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fail();
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} catch (UnsupportedOperationException ex) {
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}
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}
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}
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