1/*
2 * Copyright (c) 1997, 2012, 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
26package com.sun.xml.internal.xsom.util;
27
28import com.sun.xml.internal.xsom.XSType;
29
30/**
31 * Perform a transitive closure operation on a type to determine if it
32 * belongs to this set.
33 *
34 * The contains method returns true if the TypeSet contains an instance
35 * of the specified XSType or any of the base types of the XSType.
36 *
37 * @author <a href="mailto:Ryan.Shoemaker@Sun.COM">Ryan Shoemaker</a>, Sun Microsystems, Inc.
38 */
39public class TypeClosure extends TypeSet {
40
41    private final TypeSet typeSet;
42
43    public TypeClosure(TypeSet typeSet) {
44        this.typeSet = typeSet;
45    }
46
47    /* (non-Javadoc)
48     * @see com.sun.xml.internal.xsom.util.TypeSet#contains(com.sun.xml.internal.xsom.XSDeclaration)
49     *
50     * transitive closure variation on the contains method.
51     */
52    public boolean contains(XSType type) {
53        if( typeSet.contains(type) ) {
54            return true;
55        } else {
56            XSType baseType = type.getBaseType();
57            if( baseType == null ) {
58                return false;
59            } else {
60                // climb the super type hierarchy
61                return contains(baseType);
62            }
63        }
64    }
65
66}
67