Wed, 06 Apr 2011 19:30:57 -0700
7033809: Rename "disjunctive" to "union" in javax.lang.model
Reviewed-by: mcimadamore, jjg
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24 */
26 package javax.lang.model.util;
28 import javax.lang.model.type.*;
30 /**
31 * A skeletal visitor of types with default behavior appropriate for
32 * the {@link javax.lang.model.SourceVersion#RELEASE_6 RELEASE_6}
33 * source version.
34 *
35 * <p> <b>WARNING:</b> The {@code TypeVisitor} interface implemented
36 * by this class may have methods added to it in the future to
37 * accommodate new, currently unknown, language structures added to
38 * future versions of the Java™ programming language.
39 * Therefore, methods whose names begin with {@code "visit"} may be
40 * added to this class in the future; to avoid incompatibilities,
41 * classes which extend this class should not declare any instance
42 * methods with names beginning with {@code "visit"}.
43 *
44 * <p>When such a new visit method is added, the default
45 * implementation in this class will be to call the {@link
46 * #visitUnknown visitUnknown} method. A new abstract type visitor
47 * class will also be introduced to correspond to the new language
48 * level; this visitor will have different default behavior for the
49 * visit method in question. When the new visitor is introduced, all
50 * or portions of this visitor may be deprecated.
51 *
52 * @param <R> the return type of this visitor's methods. Use {@link
53 * Void} for visitors that do not need to return results.
54 * @param <P> the type of the additional parameter to this visitor's
55 * methods. Use {@code Void} for visitors that do not need an
56 * additional parameter.
57 *
58 * @author Joseph D. Darcy
59 * @author Scott Seligman
60 * @author Peter von der Ahé
61 *
62 * @see AbstractTypeVisitor7
63 * @since 1.6
64 */
65 public abstract class AbstractTypeVisitor6<R, P> implements TypeVisitor<R, P> {
66 /**
67 * Constructor for concrete subclasses to call.
68 */
69 protected AbstractTypeVisitor6() {}
71 /**
72 * Visits any type mirror as if by passing itself to that type
73 * mirror's {@link TypeMirror#accept accept} method. The
74 * invocation {@code v.visit(t, p)} is equivalent to {@code
75 * t.accept(v, p)}.
76 *
77 * @param t the type to visit
78 * @param p a visitor-specified parameter
79 * @return a visitor-specified result
80 */
81 public final R visit(TypeMirror t, P p) {
82 return t.accept(this, p);
83 }
85 /**
86 * Visits any type mirror as if by passing itself to that type
87 * mirror's {@link TypeMirror#accept accept} method and passing
88 * {@code null} for the additional parameter. The invocation
89 * {@code v.visit(t)} is equivalent to {@code t.accept(v, null)}.
90 *
91 * @param t the type to visit
92 * @return a visitor-specified result
93 */
94 public final R visit(TypeMirror t) {
95 return t.accept(this, null);
96 }
98 /**
99 * Visits a {@code UnionType} element by calling {@code
100 * visitUnknown}.
102 * @param t {@inheritDoc}
103 * @param p {@inheritDoc}
104 * @return the result of {@code visitUnknown}
105 *
106 * @since 1.7
107 */
108 public R visitUnion(UnionType t, P p) {
109 return visitUnknown(t, p);
110 }
112 /**
113 * {@inheritDoc}
114 *
115 * <p> The default implementation of this method in {@code
116 * AbstractTypeVisitor6} will always throw {@code
117 * UnknownTypeException}. This behavior is not required of a
118 * subclass.
119 *
120 * @param t the type to visit
121 * @return a visitor-specified result
122 * @throws UnknownTypeException
123 * a visitor implementation may optionally throw this exception
124 */
125 public R visitUnknown(TypeMirror t, P p) {
126 throw new UnknownTypeException(t, p);
127 }
128 }