gson-comments/gson/src/test/java/com/google/gson/functional/PrimitiveTest.java

/*
 * 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.functional;

import java.math.BigDecimal;
import java.math.BigInteger;

import junit.framework.TestCase;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonParseException;
import com.google.gson.common.TestTypes.CrazyLongTypeAdapter;

/**
 * Functional tests for Json primitive values: integers, and floating point numbers.
 *
 * @author Inderjeet Singh
 * @author Joel Leitch
 */
public class PrimitiveTest extends TestCase {
  private Gson gson;

  @Override
  protected void setUp() throws Exception {
    super.setUp();
    gson = new Gson();
  }

  public void testPrimitiveIntegerAutoboxedSerialization() {
    assertEquals("1", gson.toJson(1));
  }

  public void testPrimitiveIntegerAutoboxedDeserialization() {
    int expected = 1;
    int actual = gson.fromJson("1", int.class);
    assertEquals(expected, actual);

    actual = gson.fromJson("1", Integer.class);
    assertEquals(expected, actual);
  }

  public void testPrimitiveIntegerAutoboxedInASingleElementArraySerialization() {
    int target[] = {-9332};
    assertEquals("[-9332]", gson.toJson(target));
    assertEquals("[-9332]", gson.toJson(target, int[].class));
    assertEquals("[-9332]", gson.toJson(target, Integer[].class));
  }

  public void testPrimitiveIntegerAutoboxedInASingleElementArrayDeserialization() {
    int expected = 1;
    int actual = gson.fromJson("[1]", int.class);
    assertEquals(expected, actual);

    actual = gson.fromJson("[1]", Integer.class);
    assertEquals(expected, actual);
  }

  public void testReallyLongValuesSerialization() {
    long value = 333961828784581L;
    assertEquals("333961828784581", gson.toJson(value));
  }

  public void testReallyLongValuesDeserialization() {
    String json = "333961828784581";
    long value = gson.fromJson(json, Long.class);
    assertEquals(333961828784581L, value);
  }

  public void testPrimitiveLongAutoboxedSerialization() {
    assertEquals("1", gson.toJson(1L, long.class));
    assertEquals("1", gson.toJson(1L, Long.class));
  }

  public void testPrimitiveLongAutoboxedDeserialization() {
    long expected = 1L;
    long actual = gson.fromJson("1", long.class);
    assertEquals(expected, actual);

    actual = gson.fromJson("1", Long.class);
    assertEquals(expected, actual);
  }

  public void testPrimitiveLongAutoboxedInASingleElementArraySerialization() {
    long[] target = {-23L};
    assertEquals("[-23]", gson.toJson(target));
    assertEquals("[-23]", gson.toJson(target, long[].class));
    assertEquals("[-23]", gson.toJson(target, Long[].class));
  }

  public void testPrimitiveLongAutoboxedInASingleElementArrayDeserialization() {
    long expected = 1L;
    long actual = gson.fromJson("[1]", long.class);
    assertEquals(expected, actual);

    actual = gson.fromJson("[1]", Long.class);
    assertEquals(expected, actual);
  }

  public void testPrimitiveBooleanAutoboxedSerialization() {
    assertEquals("true", gson.toJson(true));
    assertEquals("false", gson.toJson(false));
  }

  public void testPrimitiveBooleanAutoboxedDeserialization() {
    assertEquals(Boolean.FALSE, gson.fromJson("[false]", Boolean.class));
    assertEquals(Boolean.TRUE, gson.fromJson("[true]", Boolean.class));

    boolean value = gson.fromJson("false", boolean.class);
    assertEquals(false, value);
    value = gson.fromJson("true", boolean.class);
    assertEquals(true, value);
  }

  public void testPrimitiveBooleanAutoboxedInASingleElementArraySerialization() {
    boolean target[] = {false};
    assertEquals("[false]", gson.toJson(target));
    assertEquals("[false]", gson.toJson(target, boolean[].class));
    assertEquals("[false]", gson.toJson(target, Boolean[].class));
  }

  public void testPrimitiveBooleanAutoboxedInASingleElementArrayDeserialization() {
    assertEquals(Boolean.FALSE, gson.fromJson("[false]", Boolean.class));
    assertEquals(Boolean.TRUE, gson.fromJson("[true]", Boolean.class));

    boolean value = gson.fromJson("[false]", boolean.class);
    assertEquals(false, value);
    value = gson.fromJson("[true]", boolean.class);
    assertEquals(true, value);
  }

  public void testPrimitiveDoubleAutoboxedSerialization() {
    assertEquals("-122.08234335", gson.toJson(-122.08234335));
    assertEquals("122.08112002", gson.toJson(new Double(122.08112002)));
  }

  public void testPrimitiveDoubleAutoboxedDeserialization() {
    double actual = gson.fromJson("-122.08858585", double.class);
    assertEquals(-122.08858585, actual);

    actual = gson.fromJson("122.023900008000", Double.class);
    assertEquals(122.023900008, actual);
  }

  public void testPrimitiveDoubleAutoboxedInASingleElementArraySerialization() {
    double[] target = {-122.08D};
    assertEquals("[-122.08]", gson.toJson(target));
    assertEquals("[-122.08]", gson.toJson(target, double[].class));
    assertEquals("[-122.08]", gson.toJson(target, Double[].class));
  }

  public void testPrimitiveDoubleAutoboxedInASingleElementArrayDeserialization() {
    double expected = -122.08;
    double actual = gson.fromJson("[-122.08]", double.class);
    assertEquals(expected, actual);

    actual = gson.fromJson("[-122.08]", Double.class);
    assertEquals(expected, actual);
  }

  public void testBigDecimalSerialization() {
    BigDecimal target = new BigDecimal("-122.0e-21");
    String json = gson.toJson(target);
    assertEquals(target, new BigDecimal(json));
  }

  public void testBigDecimalDeserialization() {
    BigDecimal target = new BigDecimal("-122.0e-21");
    String json = "-122.0e-21";
    assertEquals(target, gson.fromJson(json, BigDecimal.class));
  }

  public void testBigDecimalInASingleElementArraySerialization() {
    BigDecimal[] target = {new BigDecimal("-122.08e-21")};
    String json = gson.toJson(target);
    String actual = extractElementFromArray(json);
    assertEquals(target[0], new BigDecimal(actual));

    json = gson.toJson(target, BigDecimal[].class);
    actual = extractElementFromArray(json);
    assertEquals(target[0], new BigDecimal(actual));
  }

  public void testBigDecimalInASingleElementArrayDeserialization() {
    BigDecimal expected = new BigDecimal("-122.08e-21");
    BigDecimal actual = gson.fromJson("[-122.08e-21]", BigDecimal.class);
    assertEquals(expected, actual);
  }

  public void testSmallValueForBigDecimalSerialization() {
    BigDecimal target = new BigDecimal("1.55");
    String actual = gson.toJson(target);
    assertEquals(target.toString(), actual);
  }

  public void testSmallValueForBigDecimalDeserialization() {
    BigDecimal expected = new BigDecimal("1.55");
    BigDecimal actual = gson.fromJson("1.55", BigDecimal.class);
    assertEquals(expected, actual);
  }

  public void testBigIntegerSerialization() {
    BigInteger target = new BigInteger("12121211243123245845384534687435634558945453489543985435");
    assertEquals(target.toString(), gson.toJson(target));
  }

  public void testBigIntegerDeserialization() {
    String json = "12121211243123245845384534687435634558945453489543985435";
    BigInteger target = new BigInteger(json);
    assertEquals(target, gson.fromJson(json, BigInteger.class));
  }

  public void testBigIntegerInASingleElementArraySerialization() {
    BigInteger[] target = {new BigInteger("1212121243434324323254365345367456456456465464564564")};
    String json = gson.toJson(target);
    String actual = extractElementFromArray(json);
    assertEquals(target[0], new BigInteger(actual));

    json = gson.toJson(target, BigInteger[].class);
    actual = extractElementFromArray(json);
    assertEquals(target[0], new BigInteger(actual));
  }

  public void testBigIntegerInASingleElementArrayDeserialization() {
    BigInteger expected = new BigInteger("34343434343424242423432323243243242");
    BigInteger actual = gson.fromJson("[34343434343424242423432323243243242]", BigInteger.class);
    assertEquals(expected, actual);
  }

  public void testSmallValueForBigIntegerSerialization() {
    BigInteger target = new BigInteger("15");
    String actual = gson.toJson(target);
    assertEquals(target.toString(), actual);
  }

  public void testSmallValueForBigIntegerDeserialization() {
    BigInteger expected = new BigInteger("15");
    BigInteger actual = gson.fromJson("15", BigInteger.class);
    assertEquals(expected, actual);
  }

  public void testBadValueForBigIntegerDeserialization() {
    try {
      gson.fromJson("15.099", BigInteger.class);
      fail("BigInteger can not be decimal values.");
    } catch (JsonParseException expected) { }
  }
  
  public void testOverridingDefaultPrimitiveSerialization() {
    CrazyLongTypeAdapter typeAdapter = new CrazyLongTypeAdapter();
    gson = new GsonBuilder()
        .registerTypeAdapter(long.class, typeAdapter)
        .registerTypeAdapter(Long.class, typeAdapter)
        .create();
    long value = 1L;
    String serializedValue = gson.toJson(value);
    assertEquals(String.valueOf(value + CrazyLongTypeAdapter.DIFFERENCE), serializedValue);
    
    long deserializedValue = gson.fromJson(serializedValue, long.class);
    assertEquals(value, deserializedValue);
  }

  private String extractElementFromArray(String json) {
    return json.substring(json.indexOf('[') + 1, json.indexOf(']'));
  }
}