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.io.StringReader;
import java.math.BigDecimal;
import java.math.BigInteger;

import com.google.gson.*;
import junit.framework.TestCase;

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 testNumberSerialization() {
    Number expected = 1L;
    String json = gson.toJson(expected);
    assertEquals(expected.toString(), json);
    
    json = gson.toJson(expected, Number.class);
    assertEquals(expected.toString(), json);
  }
  
  public void testNumberDeserialization() {
    String json = "1";
    Number expected = new Integer(json);
    Number actual = gson.fromJson(json, Number.class);
    assertEquals(expected.intValue(), actual.intValue());
    
    json = String.valueOf(Long.MAX_VALUE);
    expected = new Long(json);
    actual = gson.fromJson(json, Number.class);
    assertEquals(expected.longValue(), actual.longValue());
  }

  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 testDoubleAsStringRepresentationDeserialization() {
    String doubleValue = "1.0043E+5";
    Double expected = Double.valueOf(doubleValue);
    Double actual = gson.fromJson(doubleValue, Double.class);
    assertEquals(expected, actual);

    double actual1 = gson.fromJson(doubleValue, double.class);
    assertEquals(expected.doubleValue(), actual1);
  }
  
  public void testDoubleNoFractAsStringRepresentationDeserialization() {
    String doubleValue = "1E+5";
    Double expected = Double.valueOf(doubleValue);
    Double actual = gson.fromJson(doubleValue, Double.class);
    assertEquals(expected, actual);

    double actual1 = gson.fromJson(doubleValue, double.class);
    assertEquals(expected.doubleValue(), actual1);
  }

  public void testLargeDoubleDeserialization() {
    String doubleValue = "1.234567899E8";
    Double expected = Double.valueOf(doubleValue);
    Double actual = gson.fromJson(doubleValue, Double.class);
    assertEquals(expected, actual);

    double actual1 = gson.fromJson(doubleValue, double.class);
    assertEquals(expected.doubleValue(), actual1);
  }

  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 testBigDecimalPreservePrecisionSerialization() {
    String expectedValue = "1.000";
    BigDecimal obj = new BigDecimal(expectedValue);
    String actualValue = gson.toJson(obj);
    
    assertEquals(expectedValue, actualValue);
  }
  
  public void testBigDecimalPreservePrecisionDeserialization() {
    String json = "1.000";
    BigDecimal expected = new BigDecimal(json);
    BigDecimal actual = gson.fromJson(json, BigDecimal.class);
    
    assertEquals(expected, actual);
  }

  public void testBigDecimalAsStringRepresentationDeserialization() {
    String doubleValue = "0.05E+5";
    BigDecimal expected = new BigDecimal(doubleValue);
    BigDecimal actual = gson.fromJson(doubleValue, BigDecimal.class);
    assertEquals(expected, actual);
  }
  
  public void testBigDecimalNoFractAsStringRepresentationDeserialization() {
    String doubleValue = "5E+5";
    BigDecimal expected = new BigDecimal(doubleValue);
    BigDecimal actual = gson.fromJson(doubleValue, 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(']'));
  }
  
  public void testDoubleNaNSerializationNotSupportedByDefault() {
    try {
      double nan = Double.NaN;
      gson.toJson(nan);
      fail("Gson should not accept NaN for serialization");
    } catch (IllegalArgumentException expected) {      
    }
    try {
      gson.toJson(Double.NaN);
      fail("Gson should not accept NaN for serialization");
    } catch (IllegalArgumentException expected) {      
    }
  }
    
  public void testDoubleNaNSerialization() {
    Gson gson = new GsonBuilder().serializeSpecialFloatingPointValues().create();
    double nan = Double.NaN;
    assertEquals("NaN", gson.toJson(nan));
    assertEquals("NaN", gson.toJson(Double.NaN));
  }
  
  public void testDoubleNaNDeserialization() {
    assertTrue(Double.isNaN(gson.fromJson("NaN", Double.class)));
    assertTrue(Double.isNaN(gson.fromJson("NaN", double.class)));
  }
  
  public void testFloatNaNSerializationNotSupportedByDefault() {
    try {
      float nan = Float.NaN;
      gson.toJson(nan);
      fail("Gson should not accept NaN for serialization");
    } catch (IllegalArgumentException expected) {      
    }
    try {
      gson.toJson(Float.NaN);
      fail("Gson should not accept NaN for serialization");
    } catch (IllegalArgumentException expected) {      
    }
  }
  
  public void testFloatNaNSerialization() {
    Gson gson = new GsonBuilder().serializeSpecialFloatingPointValues().create();
    float nan = Float.NaN;
    assertEquals("NaN", gson.toJson(nan));
    assertEquals("NaN", gson.toJson(Float.NaN));
  }
  
  public void testFloatNaNDeserialization() {
    assertTrue(Float.isNaN(gson.fromJson("NaN", Float.class)));
    assertTrue(Float.isNaN(gson.fromJson("NaN", float.class)));
  }

  public void testBigDecimalNaNDeserializationNotSupported() {
    try {
      gson.fromJson("NaN", BigDecimal.class);
      fail("Gson should not accept NaN for deserialization by default.");
    } catch (JsonParseException expected) {      
    }
  }

  public void testDoubleInfinitySerializationNotSupportedByDefault() {
    try {
      double infinity = Double.POSITIVE_INFINITY;
      gson.toJson(infinity);
      fail("Gson should not accept positive infinity for serialization by default.");
    } catch (IllegalArgumentException expected) {      
    }
    try {
      gson.toJson(Double.POSITIVE_INFINITY);
      fail("Gson should not accept positive infinity for serialization by default.");
    } catch (IllegalArgumentException expected) {      
    }
  }
  
  public void testDoubleInfinitySerialization() {
    Gson gson = new GsonBuilder().serializeSpecialFloatingPointValues().create();
    double infinity = Double.POSITIVE_INFINITY;
    assertEquals("Infinity", gson.toJson(infinity));
    assertEquals("Infinity", gson.toJson(Double.POSITIVE_INFINITY));
  }
  
  public void testDoubleInfinityDeserialization() {
    assertTrue(Double.isInfinite(gson.fromJson("Infinity", Double.class)));
    assertTrue(Double.isInfinite(gson.fromJson("Infinity", double.class)));
  }
  
  public void testFloatInfinitySerializationNotSupportedByDefault() {
    try {
      float infinity = Float.POSITIVE_INFINITY;
      gson.toJson(infinity);
      fail("Gson should not accept positive infinity for serialization by default");
    } catch (IllegalArgumentException expected) {      
    }
    try {
      gson.toJson(Float.POSITIVE_INFINITY);
      fail("Gson should not accept positive infinity for serialization by default");
    } catch (IllegalArgumentException expected) {      
    }
  }
  
  public void testFloatInfinitySerialization() {
    Gson gson = new GsonBuilder().serializeSpecialFloatingPointValues().create();
    float infinity = Float.POSITIVE_INFINITY;
    assertEquals("Infinity", gson.toJson(infinity));
    assertEquals("Infinity", gson.toJson(Float.POSITIVE_INFINITY));
  }
  
  public void testFloatInfinityDeserialization() {
    assertTrue(Float.isInfinite(gson.fromJson("Infinity", Float.class)));
    assertTrue(Float.isInfinite(gson.fromJson("Infinity", float.class)));
  }
  
  public void testBigDecimalInfinityDeserializationNotSupported() {
    try {
      gson.fromJson("Infinity", BigDecimal.class);
      fail("Gson should not accept positive infinity for deserialization with BigDecimal");
    } catch (JsonParseException expected) {      
    }
  }
  
  public void testNegativeInfinitySerializationNotSupportedByDefault() {
    try {
      double negativeInfinity = Double.NEGATIVE_INFINITY;
      gson.toJson(negativeInfinity);
      fail("Gson should not accept negative infinity for serialization by default");
    } catch (IllegalArgumentException expected) {      
    }
    try {
      gson.toJson(Double.NEGATIVE_INFINITY);
      fail("Gson should not accept negative infinity for serialization by default");
    } catch (IllegalArgumentException expected) {      
    }
  }
  
  public void testNegativeInfinitySerialization() {
    Gson gson = new GsonBuilder().serializeSpecialFloatingPointValues().create();
    double negativeInfinity = Double.NEGATIVE_INFINITY;
    assertEquals("-Infinity", gson.toJson(negativeInfinity));
    assertEquals("-Infinity", gson.toJson(Double.NEGATIVE_INFINITY));
  }
  
  public void testNegativeInfinityDeserialization() {
    assertTrue(Double.isInfinite(gson.fromJson("-Infinity", double.class)));
    assertTrue(Double.isInfinite(gson.fromJson("-Infinity", Double.class)));
  }
  
  public void testNegativeInfinityFloatSerializationNotSupportedByDefault() {
    try {
      float negativeInfinity = Float.NEGATIVE_INFINITY;
      gson.toJson(negativeInfinity);
      fail("Gson should not accept negative infinity for serialization by default");
    } catch (IllegalArgumentException expected) {      
    }
    try {
      gson.toJson(Float.NEGATIVE_INFINITY);
      fail("Gson should not accept negative infinity for serialization by default");
    } catch (IllegalArgumentException expected) {      
    }
  }
  
  public void testNegativeInfinityFloatSerialization() {
    Gson gson = new GsonBuilder().serializeSpecialFloatingPointValues().create();
    float negativeInfinity = Float.NEGATIVE_INFINITY;
    assertEquals("-Infinity", gson.toJson(negativeInfinity));
    assertEquals("-Infinity", gson.toJson(Float.NEGATIVE_INFINITY));
  }
  
  public void testNegativeInfinityFloatDeserialization() {
    assertTrue(Float.isInfinite(gson.fromJson("-Infinity", float.class)));
    assertTrue(Float.isInfinite(gson.fromJson("-Infinity", Float.class)));
  }
  
  public void testBigDecimalNegativeInfinityDeserializationNotSupported() {
    try {
      gson.fromJson("-Infinity", BigDecimal.class);
      fail("Gson should not accept positive infinity for deserialization");
    } catch (JsonParseException expected) {      
    }
  }  
  
  public void testLongAsStringSerialization() throws Exception {
    gson = new GsonBuilder().setLongSerializationPolicy(LongSerializationPolicy.STRING).create();
    String result = gson.toJson(15L);
    assertEquals("\"15\"", result);
    
    // Test with an integer and ensure its still a number
    result = gson.toJson(2);
    assertEquals("2", result);
  }
  
  public void testLongAsStringDeserialization() throws Exception {
    long value = gson.fromJson("\"15\"", long.class);
    assertEquals(15, value);

    gson = new GsonBuilder().setLongSerializationPolicy(LongSerializationPolicy.STRING).create();
    value = gson.fromJson("\"25\"", long.class);
    assertEquals(25, value);
  }
  
  public void testHtmlCharacterSerialization() throws Exception {
    String target = "<script>var a = 12;</script>";
    String result = gson.toJson(target);
    assertFalse(result.equals('"' + target + '"'));
    
    gson = new GsonBuilder().disableHtmlEscaping().create();
    result = gson.toJson(target);
    assertTrue(result.equals('"' + target + '"'));
  }

  public void testDeserializePrimitiveWrapperAsObjectField() {
    String json = "{i:10}";
    ClassWithIntegerField target = gson.fromJson(json, ClassWithIntegerField.class);
    assertEquals(10, target.i.intValue());
  }
  
  private static class ClassWithIntegerField {
    Integer i;
  }
  
  public void testPrimitiveClassLiteral() {
    assertEquals(1, gson.fromJson("1", int.class).intValue());
    assertEquals(1, gson.fromJson(new StringReader("1"), int.class).intValue());
    assertEquals(1, gson.fromJson(new JsonPrimitive(1), int.class).intValue());
  }
}