01 /*
02 * Copyright 2003-2004 Sun Microsystems, Inc. All Rights Reserved.
03 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04 *
05 * This code is free software; you can redistribute it and/or modify it
06 * under the terms of the GNU General Public License version 2 only, as
07 * published by the Free Software Foundation. Sun designates this
08 * particular file as subject to the "Classpath" exception as provided
09 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 package java.lang.reflect;
27
28 /**
29 * ParameterizedType represents a parameterized type such as
30 * Collection<String>.
31 *
32 * <p>A parameterized type is created the first time it is needed by a
33 * reflective method, as specified in this package. When a
34 * parameterized type p is created, the generic type declaration that
35 * p instantiates is resolved, and all type arguments of p are created
36 * recursively. See {@link java.lang.reflect.TypeVariable
37 * TypeVariable} for details on the creation process for type
38 * variables. Repeated creation of a parameterized type has no effect.
39 *
40 * <p>Instances of classes that implement this interface must implement
41 * an equals() method that equates any two instances that share the
42 * same generic type declaration and have equal type parameters.
43 *
44 * @since 1.5
45 */
46 public interface ParameterizedType extends Type {
47 /**
48 * Returns an array of {@code Type} objects representing the actual type
49 * arguments to this type.
50 *
51 * <p>Note that in some cases, the returned array be empty. This can occur
52 * if this type represents a non-parameterized type nested within
53 * a parameterized type.
54 *
55 * @return an array of {@code Type} objects representing the actual type
56 * arguments to this type
57 * @throws TypeNotPresentException if any of the
58 * actual type arguments refers to a non-existent type declaration
59 * @throws MalformedParameterizedTypeException if any of the
60 * actual type parameters refer to a parameterized type that cannot
61 * be instantiated for any reason
62 * @since 1.5
63 */
64 Type[] getActualTypeArguments();
65
66 /**
67 * Returns the {@code Type} object representing the class or interface
68 * that declared this type.
69 *
70 * @return the {@code Type} object representing the class or interface
71 * that declared this type
72 * @since 1.5
73 */
74 Type getRawType();
75
76 /**
77 * Returns a {@code Type} object representing the type that this type
78 * is a member of. For example, if this type is {@code O<T>.I<S>},
79 * return a representation of {@code O<T>}.
80 *
81 * <p>If this type is a top-level type, {@code null} is returned.
82 *
83 * @return a {@code Type} object representing the type that
84 * this type is a member of. If this type is a top-level type,
85 * {@code null} is returned
86 * @throws TypeNotPresentException if the owner type
87 * refers to a non-existent type declaration
88 * @throws MalformedParameterizedTypeException if the owner type
89 * refers to a parameterized type that cannot be instantiated
90 * for any reason
91 * @since 1.5
92 */
93 Type getOwnerType();
94 }
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