org.springframework.core.ResolvableType.asCollection()方法的使用及代码示例

x33g5p2x  于2022-01-28 转载在 其他  
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本文整理了Java中org.springframework.core.ResolvableType.asCollection方法的一些代码示例，展示了ResolvableType.asCollection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。ResolvableType.asCollection方法的具体详情如下：
包路径：org.springframework.core.ResolvableType
类名称：ResolvableType
方法名：asCollection

ResolvableType.asCollection介绍

[英]Convenience method to return this type as a resolvable Collection type. Returns #NONE if this type does not implement or extend Collection.
[中]将此类型作为可解析集合类型返回的便捷方法。如果此类型未实现或扩展集合，则返回#NONE。

代码示例

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

@Nullable
private static Class<?> getCollectionParameterType(MethodParameter methodParam) {
  Class<?> paramType = methodParam.getNestedParameterType();
  if (Collection.class == paramType || List.class.isAssignableFrom(paramType)){
    Class<?> valueType = ResolvableType.forMethodParameter(methodParam).asCollection().resolveGeneric();
    if (valueType != null) {
      return valueType;
    }
  }
  return null;
}

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

@Nullable
public Class<?> getCollectionType(int nestingLevel) {
  return getResolvableType().getNested(nestingLevel).asCollection().resolveGeneric();
}

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

@Override
@SuppressWarnings("unchecked")
protected Set<Object> createInstance() {
  if (this.sourceSet == null) {
    throw new IllegalArgumentException("'sourceSet' is required");
  }
  Set<Object> result = null;
  if (this.targetSetClass != null) {
    result = BeanUtils.instantiateClass(this.targetSetClass);
  }
  else {
    result = new LinkedHashSet<>(this.sourceSet.size());
  }
  Class<?> valueType = null;
  if (this.targetSetClass != null) {
    valueType = ResolvableType.forClass(this.targetSetClass).asCollection().resolveGeneric();
  }
  if (valueType != null) {
    TypeConverter converter = getBeanTypeConverter();
    for (Object elem : this.sourceSet) {
      result.add(converter.convertIfNecessary(elem, valueType));
    }
  }
  else {
    result.addAll(this.sourceSet);
  }
  return result;
}

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

@Override
@SuppressWarnings("unchecked")
protected List<Object> createInstance() {
  if (this.sourceList == null) {
    throw new IllegalArgumentException("'sourceList' is required");
  }
  List<Object> result = null;
  if (this.targetListClass != null) {
    result = BeanUtils.instantiateClass(this.targetListClass);
  }
  else {
    result = new ArrayList<>(this.sourceList.size());
  }
  Class<?> valueType = null;
  if (this.targetListClass != null) {
    valueType = ResolvableType.forClass(this.targetListClass).asCollection().resolveGeneric();
  }
  if (valueType != null) {
    TypeConverter converter = getBeanTypeConverter();
    for (Object elem : this.sourceList) {
      result.add(converter.convertIfNecessary(elem, valueType));
    }
  }
  else {
    result.addAll(this.sourceList);
  }
  return result;
}

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

private void growCollectionIfNecessary(Collection<Object> collection, int index, String name,
    PropertyHandler ph, int nestingLevel) {
  if (!isAutoGrowNestedPaths()) {
    return;
  }
  int size = collection.size();
  if (index >= size && index < this.autoGrowCollectionLimit) {
    Class<?> elementType = ph.getResolvableType().getNested(nestingLevel).asCollection().resolveGeneric();
    if (elementType != null) {
      for (int i = collection.size(); i < index + 1; i++) {
        collection.add(newValue(elementType, null, name));
      }
    }
  }
}

代码示例来源：origin: org.springframework/spring-web

@Nullable
private static Class<?> getCollectionParameterType(MethodParameter methodParam) {
  Class<?> paramType = methodParam.getNestedParameterType();
  if (Collection.class == paramType || List.class.isAssignableFrom(paramType)){
    Class<?> valueType = ResolvableType.forMethodParameter(methodParam).asCollection().resolveGeneric();
    if (valueType != null) {
      return valueType;
    }
  }
  return null;
}

代码示例来源：origin: org.springframework/spring-beans

@Nullable
public Class<?> getCollectionType(int nestingLevel) {
  return getResolvableType().getNested(nestingLevel).asCollection().resolveGeneric();
}

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

ResolvableType.forMethodParameter(parameter).asCollection().resolveGeneric();
if (elementType != null) {
  return convertDataArrayToTargetCollection(array, targetClass, elementType);
    ResolvableType.forMethodParameter(parameter).asCollection().resolveGeneric();
if (elementType != null) {
  return convertDataArrayToTargetCollection(array, targetClass, elementType);

代码示例来源：origin: org.springframework/spring-beans

private void growCollectionIfNecessary(Collection<Object> collection, int index, String name,
    PropertyHandler ph, int nestingLevel) {
  if (!isAutoGrowNestedPaths()) {
    return;
  }
  int size = collection.size();
  if (index >= size && index < this.autoGrowCollectionLimit) {
    Class<?> elementType = ph.getResolvableType().getNested(nestingLevel).asCollection().resolveGeneric();
    if (elementType != null) {
      for (int i = collection.size(); i < index + 1; i++) {
        collection.add(newValue(elementType, null, name));
      }
    }
  }
}

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

valueClass = ResolvableType.forMethodParameter(parameter).asCollection().resolveGeneric();
if (valueClass == null) {
  throw new IllegalArgumentException(

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

@Test
public void genericOfGenericWithAs() throws Exception {
  ResolvableType type = ResolvableType.forField(Fields.class.getField("stringListList")).asCollection();
  assertThat(type.toString(), equalTo("java.util.Collection<java.util.List<java.lang.String>>"));
  assertThat(type.getGeneric().asCollection().toString(), equalTo("java.util.Collection<java.lang.String>"));
}

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

@Test
public void resolveFromClassWithGenerics() throws Exception {
  ResolvableType type = ResolvableType.forClassWithGenerics(List.class, ResolvableType.forClassWithGenerics(List.class, String.class));
  assertThat(type.asCollection().toString(), equalTo("java.util.Collection<java.util.List<java.lang.String>>"));
  assertThat(type.asCollection().getGeneric().toString(), equalTo("java.util.List<java.lang.String>"));
  assertThat(type.asCollection().getGeneric().asCollection().toString(), equalTo("java.util.Collection<java.lang.String>"));
  assertThat(type.toString(), equalTo("java.util.List<java.util.List<java.lang.String>>"));
  assertThat(type.asCollection().getGeneric().getGeneric().resolve(), equalTo((Type) String.class));
}

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

@Test
public void resolveGenericArrayFromGeneric() throws Exception {
  ResolvableType type = ResolvableType.forField(Fields.class.getField("stringArrayList"));
  ResolvableType generic = type.asCollection().getGeneric();
  assertThat(generic.getType().toString(), equalTo("E"));
  assertThat(generic.isArray(), equalTo(true));
  assertThat(generic.resolve(), equalTo((Class) String[].class));
}

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

@Test
public void testSpr16456() throws Exception {
  ResolvableType genericType = ResolvableType.forField(
      UnresolvedWithGenerics.class.getDeclaredField("set")).asCollection();
  ResolvableType type = ResolvableType.forClassWithGenerics(ArrayList.class, genericType.getGeneric());
  assertThat(type.resolveGeneric(), equalTo(Integer.class));
}

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

@Test
public void resolveTypeVariableFromSuperType() throws Exception {
  ResolvableType type = ResolvableType.forClass(ExtendsList.class);
  assertThat(type.resolve(), equalTo((Class) ExtendsList.class));
  assertThat(type.asCollection().resolveGeneric(),
      equalTo((Class) CharSequence.class));
}

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

@Test
public void asCollection() throws Exception {
  ResolvableType type = ResolvableType.forClass(ExtendsList.class).asCollection();
  assertThat(type.resolve(), equalTo((Class) Collection.class));
  assertThat(type.resolveGeneric(), equalTo((Class) CharSequence.class));
}

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

@Test
public void hasGenerics() throws Exception {
  ResolvableType type = ResolvableType.forClass(ExtendsList.class);
  assertThat(type.hasGenerics(), equalTo(false));
  assertThat(type.asCollection().hasGenerics(), equalTo(true));
}

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

@Test
public void getComponentTypeForVariableThatResolvesToGenericArray() throws Exception {
  ResolvableType type = ResolvableType.forClass(ListOfGenericArray.class).asCollection().getGeneric();
  assertThat(type.isArray(), equalTo(true));
  assertThat(type.getType(), instanceOf(TypeVariable.class));
  assertThat(type.getComponentType().getType().toString(),
      equalTo("java.util.List<java.lang.String>"));
}

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

/**
 * If this type is an array, returns the array's component type.
 * If this type is a {@code Stream}, returns the stream's component type.
 * If this type is a {@link Collection} and it is parameterized, returns the Collection's element type.
 * If the Collection is not parameterized, returns {@code null} indicating the element type is not declared.
 * @return the array component type or Collection element type, or {@code null} if this type is a
 * Collection but its element type is not parameterized
 * @throws IllegalStateException if this type is not a {@code java.util.Collection} or array type
 */
@Nullable
public TypeDescriptor getElementTypeDescriptor() {
  if (getResolvableType().isArray()) {
    return new TypeDescriptor(getResolvableType().getComponentType(), null, getAnnotations());
  }
  if (Stream.class.isAssignableFrom(getType())) {
    return getRelatedIfResolvable(this, getResolvableType().as(Stream.class).getGeneric(0));
  }
  return getRelatedIfResolvable(this, getResolvableType().asCollection().getGeneric(0));
}

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

@Test
public void noneReturnValues() throws Exception {
  ResolvableType none = ResolvableType.NONE;
  assertThat(none.as(Object.class), equalTo(ResolvableType.NONE));
  assertThat(none.asCollection(), equalTo(ResolvableType.NONE));
  assertThat(none.asMap(), equalTo(ResolvableType.NONE));
  assertThat(none.getComponentType(), equalTo(ResolvableType.NONE));
  assertThat(none.getGeneric(0), equalTo(ResolvableType.NONE));
  assertThat(none.getGenerics().length, equalTo(0));
  assertThat(none.getInterfaces().length, equalTo(0));
  assertThat(none.getSuperType(), equalTo(ResolvableType.NONE));
  assertThat(none.getType(), equalTo(ResolvableType.EmptyType.INSTANCE));
  assertThat(none.hasGenerics(), equalTo(false));
  assertThat(none.isArray(), equalTo(false));
  assertThat(none.resolve(), nullValue());
  assertThat(none.resolve(String.class), equalTo((Class) String.class));
  assertThat(none.resolveGeneric(0), nullValue());
  assertThat(none.resolveGenerics().length, equalTo(0));
  assertThat(none.toString(), equalTo("?"));
  assertThat(none.hasUnresolvableGenerics(), equalTo(false));
  assertThat(none.isAssignableFrom(ResolvableType.forClass(Object.class)), equalTo(false));
}

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