java.lang.Object
org.eclipse.yasson.internal.ReflectionUtils
Utility class for resolution of generics during unmarshalling.
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Nested Class Summary
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Method Summary
Modifier and TypeMethodDescriptionstatic <T> T
createNoArgConstructorInstance
(Constructor<T> constructor) Create instance with constructor.static ParameterizedType
findParameterizedType
(Class<?> classToSearch, Class<?> parameterizedInterface) For generic adapters like:static <T> Constructor<T>
getDefaultConstructor
(Class<T> clazz, boolean required) Get default no argument constructor of the class.getOptionalRawType
(Type type) Get raw type by type.static Class<?>
getRawType
(Type type) Get raw type by type.static boolean
isResolvedType
(Type type) Check if type needs resolution.static Type
resolveItemVariableType
(List<Type> chain, TypeVariable<?> typeVariable, boolean warn) Resolve a bounded type variable type by its wrapper types.resolveOptionalType
(List<Type> chain, Type type) Resolves type by item information and wraps it withOptional
.static Class<?>
resolveRawType
(List<Type> chain, Type type) Get a raw type of any type.static Type
resolveType
(List<Type> chain, Type type) Resolve a type by chain.static Type
resolveTypeArguments
(ParameterizedType typeToResolve, Type typeToSearch) ResolvesTypeVariable
arguments of generic types.
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Method Details
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getOptionalRawType
Get raw type by type. Only for ParametrizedTypes, GenericArrayTypes and Classes. Empty optional is returned if raw type cannot be resolved.- Parameters:
type
- Type to get class information from, not null.- Returns:
- Class of a type.
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getRawType
Get raw type by type. Resolves only ParametrizedTypes, GenericArrayTypes and Classes. Exception is thrown if raw type cannot be resolved.- Parameters:
type
- Type to get class information from, not null.- Returns:
- Class of a raw type.
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resolveRawType
Get a raw type of any type. If type is aTypeVariable
recursively search type chain for resolution of typevar. If type is aWildcardType
find most specific upper / lower bound, which can be used. If most specific bound is aTypeVariable
, perform typevar resolution.- Parameters:
chain
- hierarchy of all wrapping types.type
- type to resolve, typically field type or generic bound, not null.- Returns:
- resolved raw class
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resolveType
Resolve a type by chain. If type is aTypeVariable
recursively search type chain for resolution of typevar. If type is aWildcardType
find most specific upper / lower bound, which can be used. If most specific bound is aTypeVariable
, perform typevar resolution.- Parameters:
chain
- hierarchy of all wrapping types.type
- type to resolve, typically field type or generic bound, not null.- Returns:
- resolved type
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resolveOptionalType
Resolves type by item information and wraps it withOptional
.- Parameters:
chain
- hierarchy of all wrapping types.type
- type- Returns:
- resolved type wrapped with Optional
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resolveItemVariableType
public static Type resolveItemVariableType(List<Type> chain, TypeVariable<?> typeVariable, boolean warn) Resolve a bounded type variable type by its wrapper types. Resolution could be done only if a compile time generic information is provided, either: by generic field or subclass of a generic class.- Parameters:
chain
- chain to search "runtime" generic type of a TypeVariable.typeVariable
- type to search in chain for, not null.warn
- whether or not to log a warning message when bounds are not found- Returns:
- Type of a generic "runtime" bound, not null.
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resolveTypeArguments
ResolvesTypeVariable
arguments of generic types.- Parameters:
typeToResolve
- type to resolvetypeToSearch
- type to search- Returns:
- resolved type
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createNoArgConstructorInstance
Create instance with constructor.- Type Parameters:
T
- type of instance- Parameters:
constructor
- const not null- Returns:
- instance
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getDefaultConstructor
Get default no argument constructor of the class.- Type Parameters:
T
- Class generic type- Parameters:
clazz
- Class to get constructor fromrequired
- if true, throws an exception if the default constructor is missing. If false, returns null in that case- Returns:
- the constructor of the class, or null. Depending on required.
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findParameterizedType
public static ParameterizedType findParameterizedType(Class<?> classToSearch, Class<?> parameterizedInterface) For generic adapters like:interface ContainerAdapter<T> extends JsonbAdapter<Box<T>, Crate<T>>...; class IntegerBoxToCrateAdapter implements ContainerAdapter<Integer>...;
- Parameters:
classToSearch
- class to resolve parameterized interfaceparameterizedInterface
- interface to search- Returns:
- type of JsonbAdapter
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isResolvedType
Check if type needs resolution. If type is a class or a parametrized type with all type arguments as classes than it is considered resolved. If any of types is type variable or wildcard type is not resolved.- Parameters:
type
- Type to check.- Returns:
- True if resolved
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