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

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


001:        package net.sf.saxon.expr;
002:
003:        /**
004:         * This class contains constants identifying dependencies that an XPath expression
005:         * might have on its context.
006:         */
007:
008:        public abstract class StaticProperty {
009:
010:            /**
011:             * Bit setting: Expression depends on current() item
012:             */
013:
014:            public static final int DEPENDS_ON_CURRENT_ITEM = 1;
015:
016:            /**
017:             * Bit setting: Expression depends on context item
018:             */
019:
020:            public static final int DEPENDS_ON_CONTEXT_ITEM = 1 << 1;
021:
022:            /**
023:             * Bit setting: Expression depends on position()
024:             */
025:
026:            public static final int DEPENDS_ON_POSITION = 1 << 2;
027:
028:            /**
029:             * Bit setting: Expression depends on last()
030:             */
031:
032:            public static final int DEPENDS_ON_LAST = 1 << 3;
033:
034:            /**
035:             * Bit setting: Expression depends on the document containing the context node
036:             */
037:
038:            public static final int DEPENDS_ON_CONTEXT_DOCUMENT = 1 << 4;
039:
040:            /**
041:             * Bit setting: Expression depends on current-group() and/or current-grouping-key()
042:             */
043:
044:            public static final int DEPENDS_ON_CURRENT_GROUP = 1 << 5;
045:
046:            /**
047:             * Bit setting: Expression depends on regex-group()
048:             */
049:
050:            public static final int DEPENDS_ON_REGEX_GROUP = 1 << 6;
051:
052:            /**
053:             * Bit setting: Expression depends on local variables
054:             */
055:
056:            public static final int DEPENDS_ON_LOCAL_VARIABLES = 1 << 7;
057:
058:            /**
059:             * Bit setting: Expression depends on user-defined functions
060:             */
061:
062:            public static final int DEPENDS_ON_USER_FUNCTIONS = 1 << 8;
063:
064:            /**
065:             * Combination of bits representing dependencies on the XSLT context
066:             */
067:
068:            public static final int DEPENDS_ON_XSLT_CONTEXT = DEPENDS_ON_CURRENT_ITEM
069:                    | DEPENDS_ON_CURRENT_GROUP | DEPENDS_ON_REGEX_GROUP;
070:
071:            /**
072:             * Combination of bits representing dependencies on the focus
073:             */
074:
075:            public static final int DEPENDS_ON_FOCUS = DEPENDS_ON_CONTEXT_ITEM
076:                    | DEPENDS_ON_POSITION | DEPENDS_ON_LAST
077:                    | DEPENDS_ON_CONTEXT_DOCUMENT;
078:
079:            /**
080:             * Combination of bits representing dependencies on the focus, but excluding dependencies
081:             * on the current document
082:             */
083:
084:            public static final int DEPENDS_ON_NON_DOCUMENT_FOCUS = DEPENDS_ON_CONTEXT_ITEM
085:                    | DEPENDS_ON_POSITION | DEPENDS_ON_LAST;
086:
087:            /**
088:             * Mask to select all the dependency bits
089:             */
090:
091:            public static final int DEPENDENCY_MASK = DEPENDS_ON_CONTEXT_DOCUMENT
092:                    | DEPENDS_ON_CONTEXT_ITEM
093:                    | DEPENDS_ON_CURRENT_GROUP
094:                    | DEPENDS_ON_REGEX_GROUP
095:                    | DEPENDS_ON_CURRENT_ITEM
096:                    | DEPENDS_ON_FOCUS
097:                    | DEPENDS_ON_LOCAL_VARIABLES
098:                    | DEPENDS_ON_USER_FUNCTIONS;
099:
100:            /*
101:             * Bit set if an empty sequence is allowed
102:             */
103:
104:            public static final int ALLOWS_ZERO = 1 << 13;
105:
106:            /**
107:             * Bit set if a single value is allowed
108:             */
109:
110:            public static final int ALLOWS_ONE = 1 << 14;
111:
112:            /**
113:             * Bit set if multiple values are allowed
114:             */
115:
116:            public static final int ALLOWS_MANY = 1 << 15;
117:
118:            /**
119:             * Mask for all cardinality bits
120:             */
121:
122:            public static final int CARDINALITY_MASK = ALLOWS_ZERO | ALLOWS_ONE
123:                    | ALLOWS_MANY;
124:
125:            /**
126:             * Occurence indicator for "one or more" (+)
127:             */
128:
129:            public static final int ALLOWS_ONE_OR_MORE = ALLOWS_ONE
130:                    | ALLOWS_MANY;
131:
132:            /**
133:             * Occurence indicator for "zero or more" (*)
134:             */
135:
136:            public static final int ALLOWS_ZERO_OR_MORE = ALLOWS_ZERO
137:                    | ALLOWS_ONE | ALLOWS_MANY;
138:
139:            /**
140:             * Occurence indicator for "zero or one" (?)
141:             */
142:
143:            public static final int ALLOWS_ZERO_OR_ONE = ALLOWS_ZERO
144:                    | ALLOWS_ONE;
145:
146:            /**
147:             * Occurence indicator for "exactly one" (default occurrence indicator)
148:             */
149:
150:            public static final int EXACTLY_ONE = ALLOWS_ONE;
151:
152:            /**
153:             * Occurence indicator when an empty sequence is required
154:             */
155:
156:            public static final int EMPTY = ALLOWS_ZERO;
157:
158:            /**
159:             * Reduce the cardinality value to an integer in the range 0-7
160:             */
161:
162:            public static final int getCardinalityCode(int cardinality) {
163:                return (cardinality & CARDINALITY_MASK) >> 13;
164:            }
165:
166:            /**
167:             * Display the cardinality value as a string (used for diagnostics)
168:             */
169:
170:            public static final String getCardinalityDescription(int cardinality) {
171:                int code = getCardinalityCode(cardinality);
172:                String[] names = { "not allowed", "exactly zero",
173:                        "exactly one", "zero or one", "many", "zero or many",
174:                        "one or more", "zero or more" };
175:                return names[code];
176:            }
177:
178:            /**
179:             * Expression property: this bit is set by getProperties() in the case of
180:             * an expression whose item type is node, when the nodes in the result are
181:             * guaranteed all to be in the same document as the context node. For
182:             * expressions that return values other than nodes, the setting is undefined.
183:             */
184:
185:            public static final int CONTEXT_DOCUMENT_NODESET = 1 << 16;
186:
187:            /**
188:             * Expression property: this bit is set by getProperties() in the case of
189:             * an expression whose item type is node, when the nodes in the result are
190:             * in document order.
191:             */
192:
193:            public static final int ORDERED_NODESET = 1 << 17;
194:
195:            /**
196:             * Expression property: this bit is set by getProperties() in the case of
197:             * an expression that delivers items in the reverse of the correct order, when unordered
198:             * retrieval is requested.
199:             */
200:
201:            public static final int REVERSE_DOCUMENT_ORDER = 1 << 18;
202:
203:            /**
204:             * Expression property: this bit is set by getProperties() in the case of
205:             * an expression that delivers a set of nodes with the guarantee that no node in the
206:             * set will be an ancestor of any other. This property is useful in deciding whether the
207:             * results of a path expression are pre-sorted. The property is only used in the case where
208:             * the NATURALLY_SORTED property is true, so there is no point in setting it in other cases.
209:             */
210:
211:            public static final int PEER_NODESET = 1 << 19;
212:
213:            /**
214:             * Expression property: this bit is set by getProperties() in the case of
215:             * an expression that delivers a set of nodes with the guarantee that every node in the
216:             * result will be a descendant or self, or attribute or namespace, of the context node
217:             */
218:
219:            public static final int SUBTREE_NODESET = 1 << 20;
220:
221:            /**
222:             * Expression property: this bit is set by getProperties() in the case of
223:             * an expression that delivers a set of nodes with the guarantee that every node in the
224:             * result will be an attribute or namespace of the context node
225:             */
226:
227:            public static final int ATTRIBUTE_NS_NODESET = 1 << 21;
228:
229:            /**
230:             * Expression property: this bit is set in the case of an expression that will
231:             * never return newly created nodes, nor a value that depends on the identity
232:             * of newly created nodes (for example generate-id(new-node())). Expressions
233:             * that do create new nodes cannot be moved out of loops as this could cause
234:             * too few nodes to be created: for example if f() creates a new node, then
235:             * count(for $i in 1 to 5 return f()) must be 5.
236:             */
237:
238:            public static final int NON_CREATIVE = 1 << 22;
239:
240:            /**
241:             * Expression property: this bit is set in the case of an expression that delivers
242:             * a set of nodes that are all in the same document (not necessarily the same
243:             * document as the context node).
244:             */
245:
246:            public static final int SINGLE_DOCUMENT_NODESET = 1 << 23;
247:
248:            /**
249:             * Mask for "special properties": that is, all properties other than cardinality
250:             * and dependencies
251:             */
252:
253:            public static final int SPECIAL_PROPERTY_MASK = CONTEXT_DOCUMENT_NODESET
254:                    | ORDERED_NODESET
255:                    | REVERSE_DOCUMENT_ORDER
256:                    | PEER_NODESET
257:                    | SUBTREE_NODESET
258:                    | ATTRIBUTE_NS_NODESET
259:                    | SINGLE_DOCUMENT_NODESET | NON_CREATIVE;
260:
261:            // This class is not instantiated
262:            private StaticProperty() {
263:            }
264:        }
265:
266:        //
267:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
268:        // you may not use this file except in compliance with the License. You may obtain a copy of the
269:        // License at http://www.mozilla.org/MPL/
270:        //
271:        // Software distributed under the License is distributed on an "AS IS" basis,
272:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
273:        // See the License for the specific language governing rights and limitations under the License.
274:        //
275:        // The Original Code is: all this file.
276:        //
277:        // The Initial Developer of the Original Code is Michael H. Kay.
278:        //
279:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
280:        //
281:        // Contributor(s): none.
282:        //
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