org.springframework.core.convert.TypeDescriptor.getObjectType()方法的使用及代码示例

x33g5p2x  于2022-01-29 转载在 其他  
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本文整理了Java中org.springframework.core.convert.TypeDescriptor.getObjectType()方法的一些代码示例，展示了TypeDescriptor.getObjectType()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。TypeDescriptor.getObjectType()方法的具体详情如下：
包路径：org.springframework.core.convert.TypeDescriptor
类名称：TypeDescriptor
方法名：getObjectType

TypeDescriptor.getObjectType介绍

[英]Variation of #getType() that accounts for a primitive type by returning its object wrapper type.

This is useful for conversion service implementations that wish to normalize to object-based types and not work with primitive types directly.
[中]#getType（）的变体，通过返回其对象包装器类型来解释基元类型。
这对于希望规范化为基于对象的类型而不直接使用基元类型的转换服务实现非常有用。

代码示例

代码示例来源：origin: spring-projects/spring-framework

/**
 * Template method to convert a {@code null} source.
 * <p>The default implementation returns {@code null} or the Java 8
 * {@link java.util.Optional#empty()} instance if the target type is
 * {@code java.util.Optional}. Subclasses may override this to return
 * custom {@code null} objects for specific target types.
 * @param sourceType the source type to convert from
 * @param targetType the target type to convert to
 * @return the converted null object
 */
@Nullable
protected Object convertNullSource(@Nullable TypeDescriptor sourceType, TypeDescriptor targetType) {
  if (targetType.getObjectType() == Optional.class) {
    return Optional.empty();
  }
  return null;
}

代码示例来源：origin: spring-projects/spring-framework

@Override
public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
  Class<?> sourceClass = sourceType.getObjectType();
  if (String.class == sourceClass) {
    // no conversion required
    return false;
  }
  return (CharSequence.class.isAssignableFrom(sourceClass) ||
      StringWriter.class.isAssignableFrom(sourceClass) ||
      ObjectToObjectConverter.hasConversionMethodOrConstructor(sourceClass, String.class));
}

代码示例来源：origin: spring-projects/spring-framework

@Nullable
private Object handleConverterNotFound(
    @Nullable Object source, @Nullable TypeDescriptor sourceType, TypeDescriptor targetType) {
  if (source == null) {
    assertNotPrimitiveTargetType(sourceType, targetType);
    return null;
  }
  if ((sourceType == null || sourceType.isAssignableTo(targetType)) &&
      targetType.getObjectType().isInstance(source)) {
    return source;
  }
  throw new ConverterNotFoundException(sourceType, targetType);
}

代码示例来源：origin: spring-projects/spring-framework

@Override
@Nullable
public Object convert(@Nullable Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
  if (source == null) {
    return convertNullSource(sourceType, targetType);
  }
  return this.converterFactory.getConverter(targetType.getObjectType()).convert(source);
}

代码示例来源：origin: spring-projects/spring-framework

@Override
public boolean canConvert(TypeDescriptor sourceTypeDescriptor, TypeDescriptor targetTypeDescriptor) {
  if (conversionService.canConvert(sourceTypeDescriptor, targetTypeDescriptor)) {
    return true;
  }
  // TODO: what does this mean? This method is not used in SpEL so probably ignorable?
  Class<?> sourceType = sourceTypeDescriptor.getObjectType();
  Class<?> targetType = targetTypeDescriptor.getObjectType();
  return canConvert(sourceType, targetType);
}

代码示例来源：origin: spring-projects/spring-framework

@Override
public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
  // Check raw type first...
  if (this.typeInfo.getTargetType() != targetType.getObjectType()) {
    return false;
  }
  // Full check for complex generic type match required?
  ResolvableType rt = targetType.getResolvableType();
  if (!(rt.getType() instanceof Class) && !rt.isAssignableFrom(this.targetType) &&
      !this.targetType.hasUnresolvableGenerics()) {
    return false;
  }
  return !(this.converter instanceof ConditionalConverter) ||
      ((ConditionalConverter) this.converter).matches(sourceType, targetType);
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void test_binaryPlusWithTime_ToString() {
  ExpressionState expressionState = new ExpressionState(new StandardEvaluationContext());
  Time time = new Time(new Date().getTime());
  VariableReference var = new VariableReference("timeVar", -1, -1);
  var.setValue(expressionState, time);
  StringLiteral n2 = new StringLiteral("\" is now\"", -1, -1, "\" is now\"");
  OpPlus o = new OpPlus(-1, -1, var, n2);
  TypedValue value = o.getValueInternal(expressionState);
  assertEquals(String.class, value.getTypeDescriptor().getObjectType());
  assertEquals(String.class, value.getTypeDescriptor().getType());
  assertEquals(time + " is now", value.getValue());
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void fieldScalar() throws Exception {
  TypeDescriptor typeDescriptor = new TypeDescriptor(getClass().getField("fieldScalar"));
  assertFalse(typeDescriptor.isPrimitive());
  assertFalse(typeDescriptor.isArray());
  assertFalse(typeDescriptor.isCollection());
  assertFalse(typeDescriptor.isMap());
  assertEquals(Integer.class, typeDescriptor.getType());
  assertEquals(Integer.class, typeDescriptor.getObjectType());
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void parameterPrimitive() throws Exception {
  TypeDescriptor desc = new TypeDescriptor(new MethodParameter(getClass().getMethod("testParameterPrimitive", int.class), 0));
  assertEquals(int.class, desc.getType());
  assertEquals(Integer.class, desc.getObjectType());
  assertEquals("int", desc.getName());
  assertEquals("int", desc.toString());
  assertTrue(desc.isPrimitive());
  assertEquals(0, desc.getAnnotations().length);
  assertFalse(desc.isCollection());
  assertFalse(desc.isMap());
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void parameterScalar() throws Exception {
  TypeDescriptor desc = new TypeDescriptor(new MethodParameter(getClass().getMethod("testParameterScalar", String.class), 0));
  assertEquals(String.class, desc.getType());
  assertEquals(String.class, desc.getObjectType());
  assertEquals("java.lang.String", desc.getName());
  assertEquals("java.lang.String", desc.toString());
  assertTrue(!desc.isPrimitive());
  assertEquals(0, desc.getAnnotations().length);
  assertFalse(desc.isCollection());
  assertFalse(desc.isArray());
  assertFalse(desc.isMap());
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void parameterListNoParamTypes() throws Exception {
  MethodParameter methodParameter = new MethodParameter(getClass().getMethod("testParameterListNoParamTypes", List.class), 0);
  TypeDescriptor desc = new TypeDescriptor(methodParameter);
  assertEquals(List.class, desc.getType());
  assertEquals(List.class, desc.getObjectType());
  assertEquals("java.util.List", desc.getName());
  assertEquals("java.util.List<?>", desc.toString());
  assertTrue(!desc.isPrimitive());
  assertEquals(0, desc.getAnnotations().length);
  assertTrue(desc.isCollection());
  assertFalse(desc.isArray());
  assertNull(desc.getElementTypeDescriptor());
  assertFalse(desc.isMap());
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void valueOfScalar() {
  TypeDescriptor typeDescriptor = TypeDescriptor.valueOf(Integer.class);
  assertFalse(typeDescriptor.isPrimitive());
  assertFalse(typeDescriptor.isArray());
  assertFalse(typeDescriptor.isCollection());
  assertFalse(typeDescriptor.isMap());
  assertEquals(Integer.class, typeDescriptor.getType());
  assertEquals(Integer.class, typeDescriptor.getObjectType());
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void valueOfPrimitive() {
  TypeDescriptor typeDescriptor = TypeDescriptor.valueOf(int.class);
  assertTrue(typeDescriptor.isPrimitive());
  assertFalse(typeDescriptor.isArray());
  assertFalse(typeDescriptor.isCollection());
  assertFalse(typeDescriptor.isMap());
  assertEquals(Integer.TYPE, typeDescriptor.getType());
  assertEquals(Integer.class, typeDescriptor.getObjectType());
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void test_binaryPlusWithLeftStringOperand() {
  ExpressionState expressionState = new ExpressionState(new StandardEvaluationContext());
  StringLiteral n1 = new StringLiteral("\"number is \"", -1, -1, "\"number is \"");
  LongLiteral n2 = new LongLiteral("123", -1, -1, 123);
  OpPlus o = new OpPlus(-1, -1, n1, n2);
  TypedValue value = o.getValueInternal(expressionState);
  assertEquals(String.class, value.getTypeDescriptor().getObjectType());
  assertEquals(String.class, value.getTypeDescriptor().getType());
  assertEquals("number is 123", value.getValue());
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void test_binaryPlusWithStringOperands() {
  ExpressionState expressionState = new ExpressionState(new StandardEvaluationContext());
  StringLiteral n1 = new StringLiteral("\"foo\"", -1, -1, "\"foo\"");
  StringLiteral n2 = new StringLiteral("\"bar\"", -1, -1, "\"bar\"");
  OpPlus o = new OpPlus(-1, -1, n1, n2);
  TypedValue value = o.getValueInternal(expressionState);
  assertEquals(String.class, value.getTypeDescriptor().getObjectType());
  assertEquals(String.class, value.getTypeDescriptor().getType());
  assertEquals("foobar", value.getValue());
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void test_binaryPlusWithRightStringOperand() {
  ExpressionState expressionState = new ExpressionState(new StandardEvaluationContext());
  LongLiteral n1 = new LongLiteral("123", -1, -1, 123);
  StringLiteral n2 = new StringLiteral("\" is a number\"", -1, -1, "\" is a number\"");
  OpPlus o = new OpPlus(-1, -1, n1, n2);
  TypedValue value = o.getValueInternal(expressionState);
  assertEquals(String.class, value.getTypeDescriptor().getObjectType());
  assertEquals(String.class, value.getTypeDescriptor().getType());
  assertEquals("123 is a number", value.getValue());
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void parameterArray() throws Exception {
  MethodParameter methodParameter = new MethodParameter(getClass().getMethod("testParameterArray", Integer[].class), 0);
  TypeDescriptor desc = new TypeDescriptor(methodParameter);
  assertEquals(Integer[].class, desc.getType());
  assertEquals(Integer[].class, desc.getObjectType());
  assertEquals("java.lang.Integer[]", desc.getName());
  assertEquals("java.lang.Integer[]", desc.toString());
  assertTrue(!desc.isPrimitive());
  assertEquals(0, desc.getAnnotations().length);
  assertFalse(desc.isCollection());
  assertTrue(desc.isArray());
  assertEquals(Integer.class, desc.getElementTypeDescriptor().getType());
  assertEquals(TypeDescriptor.valueOf(Integer.class), desc.getElementTypeDescriptor());
  assertFalse(desc.isMap());
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void collection() {
  TypeDescriptor desc = TypeDescriptor.collection(List.class, TypeDescriptor.valueOf(Integer.class));
  assertEquals(List.class, desc.getType());
  assertEquals(List.class, desc.getObjectType());
  assertEquals("java.util.List", desc.getName());
  assertEquals("java.util.List<java.lang.Integer>", desc.toString());
  assertTrue(!desc.isPrimitive());
  assertEquals(0, desc.getAnnotations().length);
  assertTrue(desc.isCollection());
  assertFalse(desc.isArray());
  assertEquals(Integer.class, desc.getElementTypeDescriptor().getType());
  assertEquals(TypeDescriptor.valueOf(Integer.class), desc.getElementTypeDescriptor());
  assertFalse(desc.isMap());
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void map() {
  TypeDescriptor desc = TypeDescriptor.map(Map.class, TypeDescriptor.valueOf(String.class), TypeDescriptor.valueOf(Integer.class));
  assertEquals(Map.class, desc.getType());
  assertEquals(Map.class, desc.getObjectType());
  assertEquals("java.util.Map", desc.getName());
  assertEquals("java.util.Map<java.lang.String, java.lang.Integer>", desc.toString());
  assertTrue(!desc.isPrimitive());
  assertEquals(0, desc.getAnnotations().length);
  assertFalse(desc.isCollection());
  assertFalse(desc.isArray());
  assertTrue(desc.isMap());
  assertEquals(String.class, desc.getMapKeyTypeDescriptor().getType());
  assertEquals(Integer.class, desc.getMapValueTypeDescriptor().getType());
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void collectionNested() {
  TypeDescriptor desc = TypeDescriptor.collection(List.class, TypeDescriptor.collection(List.class, TypeDescriptor.valueOf(Integer.class)));
  assertEquals(List.class, desc.getType());
  assertEquals(List.class, desc.getObjectType());
  assertEquals("java.util.List", desc.getName());
  assertEquals("java.util.List<java.util.List<java.lang.Integer>>", desc.toString());
  assertTrue(!desc.isPrimitive());
  assertEquals(0, desc.getAnnotations().length);
  assertTrue(desc.isCollection());
  assertFalse(desc.isArray());
  assertEquals(List.class, desc.getElementTypeDescriptor().getType());
  assertEquals(TypeDescriptor.valueOf(Integer.class), desc.getElementTypeDescriptor().getElementTypeDescriptor());
  assertFalse(desc.isMap());
}

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