Thu, 31 Aug 2017 15:18:52 +0800
merge
1 /*
2 * Copyright (c) 1997, 2010, 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 */
26 package com.sun.xml.internal.xsom.util;
28 import com.sun.xml.internal.xsom.XSType;
30 /**
31 * A simple abstraction for a set of Types that defines containment functions.
32 *
33 * @author <a href="mailto:Ryan.Shoemaker@Sun.COM">Ryan Shoemaker</a>, Sun Microsystems, Inc.
34 */
35 public abstract class TypeSet {
37 /**
38 * Return true if this TypeSet contains the specified type.
39 *
40 * Concrete implementations of this method determine what it
41 * means for the TypeSet to "contain" a type.
42 *
43 * @param type the type
44 * @return true iff this TypeSet contains the specified type
45 */
46 public abstract boolean contains(XSType type);
48 /**
49 * Calculate the TypeSet formed by the intersection of two
50 * other TypeSet objects.
51 *
52 * @param a a TypeSet
53 * @param b another TypeSet
54 * @return the intersection of a and b
55 */
56 public static TypeSet intersection(final TypeSet a, final TypeSet b) {
57 return new TypeSet(){
58 public boolean contains(XSType type) {
59 return a.contains(type) && b.contains(type);
60 }
61 };
62 }
64 /**
65 * Calculate the TypeSet formed by the union of two
66 * other TypeSet objects.
67 *
68 * @param a a TypeSet
69 * @param b another TypeSet
70 * @return the union of a and b
71 */
72 public static TypeSet union(final TypeSet a, final TypeSet b) {
73 return new TypeSet(){
74 public boolean contains(XSType type) {
75 return a.contains(type) || b.contains(type);
76 }
77 };
78 }
79 }