Source Code Cross Referenced for Cardinality.java in  » XML » saxonb » net » sf » saxon » value » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » saxonb » net.sf.saxon.value 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.value;
002:
003:        import net.sf.saxon.expr.StaticProperty;
004:
005:        /**
006:         * This class contains static methods to manipulate the cardinality
007:         * property of a type.
008:         * Cardinality of expressions is denoted by one of the values ONE_OR_MORE, ZERO_OR_MORE,
009:         * ZERO_OR_ONE, EXACTLY_ONE, or EMPTY. These are combinations of the three bit-significant
010:         * values ALLOWS_ZERO, ALLOWS_ONE, and ALLOWS_MANY.
011:         */
012:
013:        public final class Cardinality {
014:
015:            /**
016:             * Private constructor: no instances allowed
017:             */
018:
019:            private Cardinality() {
020:            }
021:
022:            /**
023:             * Determine whether multiple occurrences are allowed
024:             */
025:
026:            public static final boolean allowsMany(int cardinality) {
027:                return (cardinality & StaticProperty.ALLOWS_MANY) != 0;
028:            }
029:
030:            /**
031:             * Determine whether empty sequence is allowed
032:             */
033:
034:            public static final boolean allowsZero(int cardinality) {
035:                return (cardinality & StaticProperty.ALLOWS_ZERO) != 0;
036:            }
037:
038:            /**
039:             * Form the union of two cardinalities. The cardinality of the expression "if (c) then e1 else e2"
040:             * is the union of the cardinalities of e1 and e2.
041:             * @param c1 a cardinality
042:             * @param c2 another cardinality
043:             * @return the cardinality that allows both c1 and c2
044:             */
045:
046:            public static final int union(int c1, int c2) {
047:                int r = c1 | c2;
048:                // eliminate disallowed options
049:                if (r == (StaticProperty.ALLOWS_MANY | StaticProperty.ALLOWS_ZERO))
050:                    r = StaticProperty.ALLOWS_ZERO_OR_MORE;
051:                return r;
052:            }
053:
054:            /**
055:             * Form the sum of two cardinalities
056:             */
057:
058:            public static final int sum(int c1, int c2) {
059:                if (allowsMany(c1) || allowsMany(c2)) {
060:                    return c1 | c2;
061:                }
062:                if (!allowsZero(c1) && !allowsZero(c2)) {
063:                    return StaticProperty.ALLOWS_ONE_OR_MORE;
064:                } else {
065:                    return StaticProperty.ALLOWS_ZERO_OR_MORE;
066:                }
067:            }
068:
069:            /**
070:             * Test if one cardinality subsumes another. Cardinality c1 subsumes c2 if every option permitted
071:             * by c2 is also permitted by c1.
072:             * @param c1 a cardinality
073:             * @param c2 another cardinality
074:             * @return true if if every option permitted
075:             * by c2 is also permitted by c1.
076:             */
077:
078:            public static final boolean subsumes(int c1, int c2) {
079:                return (c1 | c2) == c1;
080:            }
081:
082:            /**
083:             * Add two cardinalities
084:             */
085:
086:            public static final int add(int c1, int c2) {
087:                if (c1 == StaticProperty.EMPTY) {
088:                    return c2;
089:                }
090:                if (c2 == StaticProperty.EMPTY) {
091:                    return c1;
092:                }
093:                boolean allowsZero = Cardinality.allowsZero(c1)
094:                        && Cardinality.allowsZero(c2);
095:                return StaticProperty.ALLOWS_ONE_OR_MORE
096:                        | (allowsZero ? StaticProperty.ALLOWS_ZERO : 0);
097:            }
098:
099:            /**
100:             * Multiply two cardinalities
101:             */
102:
103:            public static final int multiply(int c1, int c2) {
104:                if (c1 == StaticProperty.EMPTY || c2 == StaticProperty.EMPTY) {
105:                    return StaticProperty.EMPTY;
106:                }
107:                if (c2 == StaticProperty.EXACTLY_ONE) {
108:                    return c1;
109:                }
110:                if (c1 == StaticProperty.EXACTLY_ONE) {
111:                    return c2;
112:                }
113:                if (c1 == StaticProperty.ALLOWS_ZERO_OR_ONE
114:                        && c2 == StaticProperty.ALLOWS_ZERO_OR_ONE) {
115:                    return StaticProperty.ALLOWS_ZERO_OR_ONE;
116:                }
117:                if (c1 == StaticProperty.ALLOWS_ONE_OR_MORE
118:                        && c2 == StaticProperty.ALLOWS_ONE_OR_MORE) {
119:                    return StaticProperty.ALLOWS_ONE_OR_MORE;
120:                }
121:                return StaticProperty.ALLOWS_ZERO_OR_MORE;
122:            }
123:
124:            /**
125:             * Display the cardinality
126:             */
127:
128:            public static String toString(int cardinality) {
129:                switch (cardinality) {
130:                case StaticProperty.ALLOWS_ZERO_OR_ONE:
131:                    return "zero or one";
132:                case StaticProperty.EXACTLY_ONE:
133:                    return "exactly one";
134:                case StaticProperty.ALLOWS_ZERO_OR_MORE:
135:                    return "zero or more";
136:                case StaticProperty.ALLOWS_ONE_OR_MORE:
137:                    return "one or more";
138:                case StaticProperty.EMPTY:
139:                    return "exactly zero";
140:                case StaticProperty.ALLOWS_MANY:
141:                    return "more than one";
142:                default:
143:                    return "code " + cardinality;
144:                }
145:            }
146:
147:            /**
148:             * Get the occurence indicator representing the cardinality
149:             */
150:
151:            public static String getOccurrenceIndicator(int cardinality) {
152:                switch (cardinality) {
153:                case StaticProperty.ALLOWS_ZERO_OR_ONE:
154:                    return "?";
155:                case StaticProperty.EXACTLY_ONE:
156:                    return "";
157:                case StaticProperty.ALLOWS_ZERO_OR_MORE:
158:                    return "*";
159:                case StaticProperty.ALLOWS_ONE_OR_MORE:
160:                    return "+";
161:                default:
162:                    throw new AssertionError("unknown cardinality value");
163:                }
164:            }
165:        }
166:
167:        //
168:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
169:        // you may not use this file except in compliance with the License. You may obtain a copy of the
170:        // License at http://www.mozilla.org/MPL/
171:        //
172:        // Software distributed under the License is distributed on an "AS IS" basis,
173:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
174:        // See the License for the specific language governing rights and limitations under the License.
175:        //
176:        // The Original Code is: all this file.
177:        //
178:        // The Initial Developer of the Original Code is Michael H. Kay
179:        //
180:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
181:        //
182:        // Contributor(s): none.
183:        //
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