1 /*
2 * Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package javax.annotation.processing;
27
28 import javax.lang.model.element.Element;
29 import javax.lang.model.element.TypeElement;
30 import java.util.LinkedHashSet;
31 import java.util.Collections;
32 import java.util.Set;
33 import java.lang.annotation.Annotation;
34
35 /**
36 * An annotation processing tool framework will {@linkplain
37 * Processor#process provide an annotation processor with an object
38 * implementing this interface} so that the processor can query for
39 * information about a round of annotation processing.
40 *
41 * @author Joseph D. Darcy
42 * @author Scott Seligman
43 * @author Peter von der Ahé
44 * @since 1.6
45 */
46 public interface RoundEnvironment {
47 /**
48 * Returns {@code true} if types generated by this round will not
49 * be subject to a subsequent round of annotation processing;
50 * returns {@code false} otherwise.
51 *
52 * @return {@code true} if types generated by this round will not
53 * be subject to a subsequent round of annotation processing;
54 * returns {@code false} otherwise
55 */
56 boolean processingOver();
57
58 /**
59 * Returns {@code true} if an error was raised in the prior round
60 * of processing; returns {@code false} otherwise.
61 *
62 * @return {@code true} if an error was raised in the prior round
63 * of processing; returns {@code false} otherwise
64 */
65 boolean errorRaised();
66
67 /**
68 * Returns the root elements for annotation processing generated
69 * by the prior round.
70 *
71 * @return the root elements for annotation processing generated
72 * by the prior round, or an empty set if there were none
73 */
74 Set<? extends Element> getRootElements();
75
76 /**
77 * Returns the elements annotated with the given annotation type.
78 * The annotation may appear directly or be inherited. Only
79 * package elements and type elements <i>included</i> in this
80 * round of annotation processing, or declarations of members,
81 * constructors, parameters, or type parameters declared within
82 * those, are returned. Included type elements are {@linkplain
83 * #getRootElements root types} and any member types nested within
84 * them. Elements in a package are not considered included simply
85 * because a {@code package-info} file for that package was
86 * created.
87 *
88 * @param a annotation type being requested
89 * @return the elements annotated with the given annotation type,
90 * or an empty set if there are none
91 * @throws IllegalArgumentException if the argument does not
92 * represent an annotation type
93 */
94 Set<? extends Element> getElementsAnnotatedWith(TypeElement a);
95
96 /**
97 * Returns the elements annotated with one or more of the given
98 * annotation types.
99 *
100 * @apiNote This method may be useful when processing repeating
101 * annotations by looking for an annotation type and its
102 * containing annotation type at the same time.
103 *
104 * @implSpec The default implementation of this method creates an
105 * empty result set, iterates over the annotations in the argument
106 * array calling {@link #getElementsAnnotatedWith(TypeElement)} on
107 * each annotation and adding those results to the result
108 * set. Finally, the contents of the result set are returned as an
109 * unmodifiable set.
110 *
111 * @param annotations annotation types being requested
112 * @return the elements annotated with one or more of the given
113 * annotation types, or an empty set if there are none
114 * @throws IllegalArgumentException if the any elements of the
115 * argument set do not represent an annotation type
116 * @jls 9.6.3 Repeatable Annotation Types
117 * @since 9
118 */
119 default Set<? extends Element> getElementsAnnotatedWithAny(TypeElement... annotations){
120 // Use LinkedHashSet rather than HashSet for predictability
121 Set<Element> result = new LinkedHashSet<>();
122 for (TypeElement annotation : annotations) {
123 result.addAll(getElementsAnnotatedWith(annotation));
124 }
125 return Collections.unmodifiableSet(result);
126 }
127
128 /**
129 * Returns the elements annotated with the given annotation type.
130 * The annotation may appear directly or be inherited. Only
131 * package elements and type elements <i>included</i> in this
132 * round of annotation processing, or declarations of members,
133 * constructors, parameters, or type parameters declared within
134 * those, are returned. Included type elements are {@linkplain
135 * #getRootElements root types} and any member types nested within
136 * them. Elements in a package are not considered included simply
137 * because a {@code package-info} file for that package was
138 * created.
139 *
140 * @param a annotation type being requested
141 * @return the elements annotated with the given annotation type,
142 * or an empty set if there are none
143 * @throws IllegalArgumentException if the argument does not
144 * represent an annotation type
145 */
146 Set<? extends Element> getElementsAnnotatedWith(Class<? extends Annotation> a);
147
148 /**
149 * Returns the elements annotated with one or more of the given
150 * annotation types.
151 *
152 * @apiNote This method may be useful when processing repeating
153 * annotations by looking for an annotation type and its
154 * containing annotation type at the same time.
155 *
156 * @implSpec The default implementation of this method creates an
157 * empty result set, iterates over the annotations in the argument
158 * set calling {@link #getElementsAnnotatedWith(Class)} on
159 * each annotation and adding those results to the result
160 * set. Finally, the contents of the result set are returned as an
161 * unmodifiable set.
162 *
163 * @param annotations annotation types being requested
164 * @return the elements annotated with one or more of the given
165 * annotation types, or an empty set if there are none
166 * @throws IllegalArgumentException if the any elements of the
167 * argument set do not represent an annotation type
168 * @jls 9.6.3 Repeatable Annotation Types
169 * @since 9
170 */
171 default Set<? extends Element> getElementsAnnotatedWithAny(Set<Class<? extends Annotation>> annotations){
172 // Use LinkedHashSet rather than HashSet for predictability
173 Set<Element> result = new LinkedHashSet<>();
174 for (Class<? extends Annotation> annotation : annotations) {
175 result.addAll(getElementsAnnotatedWith(annotation));
176 }
177 return Collections.unmodifiableSet(result);
178 }
179 }