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## com.sun.mirror.util
Interface Types

    public interface Types

Utility methods for operating on types.

Since:
  1.5

Method Summary
`ArrayType` | `getArrayType(TypeMirror componentType)` Returns an array type with the specified component type.
`DeclaredType` | `getDeclaredType(DeclaredType containing, TypeDeclaration decl, TypeMirror... typeArgs)` Returns the type corresponding to a type declaration and actual arguments, given a containing type of which it is a member.
`DeclaredType` | `getDeclaredType(TypeDeclaration decl, TypeMirror... typeArgs)` Returns the type corresponding to a type declaration and actual type arguments.
`TypeMirror` | `getErasure(TypeMirror t)` Returns the erasure of a type.
`PrimitiveType` | `getPrimitiveType(PrimitiveType.Kind kind)` Returns a primitive type.
`TypeVariable` | `getTypeVariable(TypeParameterDeclaration tparam)` Returns the type variable declared by a type parameter.
`VoidType` | `getVoidType()` Returns the pseudo-type representing the type of `void`.
`WildcardType` | `getWildcardType(Collection<ReferenceType> upperBounds, Collection<ReferenceType> lowerBounds)` Returns a new wildcard.
`boolean` | `isAssignable(TypeMirror t1, TypeMirror t2)` Tests whether one type is assignable to another.
`boolean` | `isSubtype(TypeMirror t1, TypeMirror t2)` Tests whether one type is a subtype of the another.

Method Detail

### isSubtype

    boolean isSubtype(TypeMirror t1,
                      TypeMirror t2)

  Tests whether one type is a subtype of the another. Any type is considered to be a subtype of itself.

  Parameters:
    `t1` - the first type
    `t2` - the second type
  Returns:
    `true` if and only if the first type is a subtype of the second

### isAssignable

    boolean isAssignable(TypeMirror t1,
                         TypeMirror t2)

  Tests whether one type is assignable to another.

  Parameters:
    `t1` - the first type
    `t2` - the second type
  Returns:
    `true` if and only if the first type is assignable to the second

### getErasure

    TypeMirror getErasure(TypeMirror t)

  Returns the erasure of a type.

  Parameters:
    `t` - the type to be erased
  Returns:
    the erasure of the given type

### getPrimitiveType

    PrimitiveType getPrimitiveType(PrimitiveType.Kind kind)

  Returns a primitive type.

  Parameters:
    `kind` - the kind of primitive type to return
  Returns:
    a primitive type

### getVoidType

    VoidType getVoidType()

  Returns the pseudo-type representing the type of `void`.

  Returns:
    the pseudo-type representing the type of `void`

### getArrayType

    ArrayType getArrayType(TypeMirror componentType)

  Returns an array type with the specified component type.

  Parameters:
    `componentType` - the component type
  Returns:
    an array type with the specified component type.
  Throws:
    `IllegalArgumentException` - if the component type is not valid for an array

### getTypeVariable

    TypeVariable getTypeVariable(TypeParameterDeclaration tparam)

  Returns the type variable declared by a type parameter.

  Parameters:
    `tparam` - the type parameter
  Returns:
    the type variable declared by the type parameter

### getWildcardType

    WildcardType getWildcardType(Collection<ReferenceType> upperBounds,
                                 Collection<ReferenceType> lowerBounds)

  Returns a new wildcard. Either the wildcards's upper bounds or lower bounds may be specified, or neither, but not both.

  Parameters:
    `upperBounds` - the upper bounds of this wildcard, or an empty collection if none
    `lowerBounds` - the lower bounds of this wildcard, or an empty collection if none
  Returns:
    a new wildcard
  Throws:
    `IllegalArgumentException` - if bounds are not valid

### getDeclaredType

    DeclaredType getDeclaredType(TypeDeclaration decl,
                                 TypeMirror... typeArgs)

  Returns the type corresponding to a type declaration and actual type arguments. Given the declaration for `String`, for example, this method may be used to get the `String` type. It may then be invoked a second time, with the declaration for `Set`, to make the parameterized type `Set<String>`.

  The number of type arguments must either equal the number of the declaration's formal type parameters, or must be zero. If zero, and if the declaration is generic, then the declaration's raw type is returned.

  If a parameterized type is being returned, its declaration must not be contained within a generic outer class. The parameterized type `Outer<String>.Inner<Number>`, for example, may be constructed by first using this method to get the type `Outer<String>`, and then invoking `getDeclaredType(DeclaredType, TypeDeclaration, TypeMirror...)`.

  Parameters:
    `decl` - the type declaration
    `typeArgs` - the actual type arguments
  Returns:
    the type corresponding to the type declaration and actual type arguments
  Throws:
    `IllegalArgumentException` - if too many or too few type arguments are given, or if an inappropriate type argument or declaration is provided

### getDeclaredType

    DeclaredType getDeclaredType(DeclaredType containing,
                                 TypeDeclaration decl,
                                 TypeMirror... typeArgs)

  Returns the type corresponding to a type declaration and actual arguments, given a containing type of which it is a member. The parameterized type `Outer<String>.Inner<Number>`, for example, may be constructed by first using `getDeclaredType(TypeDeclaration, TypeMirror...)` to get the type `Outer<String>`, and then invoking this method.

  If the containing type is a parameterized type, the number of type arguments must equal the number of the declaration's formal type parameters. If it is not parameterized or if it is `null`, this method is equivalent to `getDeclaredType(decl, typeArgs)`.

  Parameters:
    `containing` - the containing type, or `null` if none
    `decl` - the type declaration
    `typeArgs` - the actual type arguments
  Returns:
    the type corresponding to the type declaration and actual type arguments, contained within the given type
  Throws:
    `IllegalArgumentException` - if too many or too few type arguments are given, or if an inappropriate type argument, declaration, or containing type is provided

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