ParameterizedType


1   /*
2    * @(#)ParameterizedType.java   1.4 04/02/06
3    *
4    * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
5    * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
6    */
7   
8   package java.lang.reflect;
9   
10  
11  /**
12   * ParameterizedType represents a parameterized type such as
13   * Collection&lt;String&gt;.
14   *
15   * <p>A parameterized type is created the first time it is needed by a
16   * reflective method, as specified in this package. When a
17   * parameterized type p is created, the generic type declaration that
18   * p instantiates is resolved, and all type arguments of p are created
19   * recursively. See {@link java.lang.reflect.TypeVariable
20   * TypeVariable} for details on the creation process for type
21   * variables. Repeated creation of a parameterized type has no effect.
22   *
23   * <p>Instances of classes that implement this interface must implement
24   * an equals() method that equates any two instances that share the
25   * same generic type declaration and have equal type parameters.
26   *
27   * @since 1.5
28   */
29  public interface ParameterizedType extends Type   {
30      /**
31       * Returns an array of <tt>Type</tt> objects representing the actual type
32       * arguments to this type.
33       * 
34       * <p>Note that in some cases, the returned array be empty. This can occur
35       * if this type represents a non-parameterized type nested within
36       * a parameterized type.
37       *
38       * @return an array of <tt>Type</tt> objects representing the actual type
39       *     arguments to this type
40       * @throws <tt>TypeNotPresentException</tt> if any of the
41       *     actual type arguments refers to a non-existent type declaration
42       * @throws <tt>MalformedParameterizedTypeException</tt> if any of the 
43       *     actual type parameters refer to a parameterized type that cannot
44       *     be instantiated for any reason
45       * @since 1.5
46       */
47      Type  [] getActualTypeArguments();
48  
49      /**
50       * Returns the <tt>Type</tt> object representing the class or interface
51       * that declared this type.
52       *
53       * @return the <tt>Type</tt> object representing the class or interface
54       *     that declared this type
55       * @since 1.5
56       */
57      Type   getRawType();
58  
59      /**
60       * Returns a <tt>Type</tt> object representing the type that this type
61       * is a member of.  For example, if this type is {@code O<T>.I<S>},
62       * return a representation of {@code O<T>}.
63       *
64       * <p>If this type is a top-level type, <tt>null</tt> is returned.
65       *
66       * @return a <tt>Type</tt> object representing the type that 
67       *     this type is a member of. If this type is a top-level type, 
68       *     <tt>null</tt> is returned
69       * @throws <tt>TypeNotPresentException</tt> if the owner type
70       *     refers to a non-existent type declaration
71       * @throws <tt>MalformedParameterizedTypeException</tt> if the owner type
72       *     refers to a parameterized type that cannot be instantiated 
73       *     for any reason
74       * @since 1.5
75       */
76      Type   getOwnerType();
77  }
78  
79
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