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

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


001:        package net.sf.saxon.query;
002:
003:        import net.sf.saxon.expr.*;
004:        import net.sf.saxon.instruct.GeneralVariable;
005:        import net.sf.saxon.instruct.GlobalParam;
006:        import net.sf.saxon.instruct.GlobalVariable;
007:        import net.sf.saxon.instruct.SlotManager;
008:        import net.sf.saxon.om.NamePool;
009:        import net.sf.saxon.trans.XPathException;
010:        import net.sf.saxon.type.ItemType;
011:        import net.sf.saxon.type.Type;
012:        import net.sf.saxon.type.TypeHierarchy;
013:        import net.sf.saxon.value.SequenceType;
014:
015:        import java.util.ArrayList;
016:        import java.util.Iterator;
017:        import java.util.List;
018:
019:        /**
020:         * Class to hold compile-time information about an XQuery global variable
021:         * or parameter
022:         */
023:
024:        public class GlobalVariableDefinition implements  VariableDeclaration,
025:                Declaration {
026:
027:            protected List references = new ArrayList(10);
028:            private SequenceType requiredType;
029:            private Expression value;
030:            private int nameCode;
031:            private boolean isParameter;
032:            private String variableName;
033:            private String systemId; // identifies the module where the variable declaration occurred
034:            private int lineNumber; // identifies the line number of the variable declaration
035:            private GlobalVariable compiledVar;
036:
037:            /**
038:             * Set the required type of the variable
039:             * @param type the declared type, from the "as" clause if present
040:             */
041:
042:            public void setRequiredType(SequenceType type) {
043:                requiredType = type;
044:            }
045:
046:            /**
047:             * Get the required type of the variable
048:             * @return the declared type, from the "as" clause if present
049:             */
050:
051:            public SequenceType getRequiredType() {
052:                return requiredType;
053:            }
054:
055:            /**
056:             * Set the variable name
057:             * @param nameCode the variable name, expressed as a NamePool name code
058:             */
059:            public void setNameCode(int nameCode) {
060:                this .nameCode = nameCode;
061:            }
062:
063:            /**
064:             * Get the variable name
065:             * @return the variable name, expressed as a NamePool name code
066:             */
067:            public int getNameCode() {
068:                return nameCode;
069:            }
070:
071:            /**
072:             * Set the line number where the variable declaration appears in the source
073:             * @param lineNumber the line number
074:             */
075:            public void setLineNumber(int lineNumber) {
076:                this .lineNumber = lineNumber;
077:            }
078:
079:            /**
080:             * Get the line number where the declaration appears
081:             */
082:
083:            public int getLineNumber() {
084:                return lineNumber;
085:            }
086:
087:            /**
088:             * Get column number
089:             * @return -1 always
090:             */
091:
092:            public int getColumnNumber() {
093:                return -1;
094:            }
095:
096:            /**
097:             * Get public identifier
098:             * @return null always
099:             */
100:
101:            public String getPublicId() {
102:                return null;
103:            }
104:
105:            /**
106:             * Set the system ID of the module where the variable declaration appears
107:             */
108:            public void setSystemId(String systemId) {
109:                this .systemId = systemId;
110:            }
111:
112:            /**
113:             * Get the system ID of the module containing the variable declaration
114:             */
115:
116:            public String getSystemId() {
117:                return systemId;
118:            }
119:
120:            /**
121:             * Get the name of the variable
122:             * @return the variable name, as a lexical QName
123:             */
124:            public String getVariableName() {
125:                return variableName;
126:            }
127:
128:            /**
129:             * Set the variable name
130:             * @param variableName the variable name, as a lexical QName
131:             */
132:            public void setVariableName(String variableName) {
133:                this .variableName = variableName;
134:            }
135:
136:            /**
137:             * Set the expression used to define the value of the variable
138:             * @param val the initializing expression
139:             */
140:            public void setValueExpression(Expression val) {
141:                this .value = val;
142:            }
143:
144:            /**
145:             * Indicate whether this global variable is a "parameter" (an external variable, in XQuery terminology)
146:             * @param b true if this variable is external
147:             */
148:            public void setIsParameter(boolean b) {
149:                isParameter = b;
150:            }
151:
152:            /**
153:             * Register a variable reference that refers to this global variable
154:             * @param ref the variable reference
155:             */
156:            public void registerReference(BindingReference ref) {
157:                references.add(ref);
158:            }
159:
160:            /**
161:             * Iterate over the references to this variable
162:             */
163:
164:            public Iterator iterateReferences() {
165:                return references.iterator();
166:            }
167:
168:            /**
169:             * Create a compiled representation of this global variable
170:             * @param env the static context for the query module
171:             * @param slot the slot number allocated to this variable
172:             * @return the compiled representation
173:             * @throws XPathException if compile-time errors are found.
174:             */
175:
176:            public GlobalVariable compile(StaticQueryContext env, int slot)
177:                    throws XPathException {
178:
179:                GlobalVariable var;
180:                if (isParameter) {
181:                    var = new GlobalParam();
182:                    var.setExecutable(env.getExecutable());
183:                    var.setRequiredParam(value == null);
184:                } else {
185:                    var = new GlobalVariable();
186:                    var.setExecutable(env.getExecutable());
187:                }
188:
189:                var.setSelectExpression(value);
190:                var.setNameCode(nameCode);
191:                var.setRequiredType(requiredType);
192:                var.setVariableName(variableName);
193:                var.setSlotNumber(slot);
194:
195:                int loc = var.getExecutable().getLocationMap()
196:                        .allocateLocationId(systemId, lineNumber);
197:                var.setLocationId(loc);
198:
199:                Iterator iter = references.iterator();
200:                while (iter.hasNext()) {
201:                    BindingReference binding = (BindingReference) iter.next();
202:                    binding.setStaticType(requiredType, null, 0);
203:                    binding.fixup(var);
204:                }
205:                env.getExecutable().registerGlobalVariable(var);
206:                int referenceCount = RangeVariableDeclaration
207:                        .getReferenceCount(references, var, env, true);
208:                if (referenceCount < 10) {
209:                    // allow for the fact that the references may be in functions that are executed repeatedly
210:                    referenceCount = 10;
211:                }
212:                var.setReferenceCount(referenceCount);
213:                compiledVar = var;
214:                return var;
215:            }
216:
217:            /**
218:             * Type check the compiled representation of this global variable
219:             * @param env the static context for the query module
220:             * @throws XPathException if compile-time errors are found.
221:             */
222:
223:            public static void typeCheck(StaticQueryContext env,
224:                    GeneralVariable var) throws XPathException {
225:
226:                Expression value = var.getSelectExpression();
227:                if (value != null) {
228:                    if (value instanceof  ComputedExpression) {
229:                        ((ComputedExpression) value).setParentExpression(var);
230:                    }
231:                    RoleLocator role = new RoleLocator(
232:                            RoleLocator.VARIABLE,
233:                            env.getNamePool().getDisplayName(var.getNameCode()),
234:                            0, null);
235:                    Expression value2 = TypeChecker.strictTypeCheck(value
236:                            .simplify(env).typeCheck(env, Type.ITEM_TYPE), var
237:                            .getRequiredType(), role, env);
238:                    value2 = value2.optimize(env.getConfiguration()
239:                            .getOptimizer(), env, Type.ITEM_TYPE);
240:                    var.setSelectExpression(value2);
241:                    if (value2 instanceof  ComputedExpression) {
242:                        ((ComputedExpression) value2).setParentExpression(var);
243:                    }
244:                    // the value expression may declare local variables
245:                    SlotManager map = env.getConfiguration().makeSlotManager();
246:                    int slots = ExpressionTool.allocateSlots(value2, 0, map);
247:                    if (slots > 0) {
248:                        ((GlobalVariable) var).setContainsLocals(map);
249:                    }
250:                }
251:
252:                if (var.getRequiredType() == SequenceType.ANY_SEQUENCE
253:                        && !(var instanceof  GlobalParam)) {
254:                    // no type was declared; try to deduce a type from the value
255:                    try {
256:                        final TypeHierarchy th = env.getNamePool()
257:                                .getTypeHierarchy();
258:                        final ItemType itemType = value.getItemType(th);
259:                        final int cardinality = value.getCardinality();
260:                        var.setRequiredType(SequenceType.makeSequenceType(
261:                                itemType, cardinality));
262:                    } catch (Exception err) {
263:                        // exceptions can happen because references to variables and functions are still unbound
264:                    }
265:                }
266:            }
267:
268:            /**
269:             * Get the compiled variable if the definition has been compiled
270:             */
271:
272:            public GlobalVariable getCompiledVariable() {
273:                return compiledVar;
274:            }
275:
276:            /**
277:             * Produce diagnostic output showing the compiled and optimized expression tree for a function
278:             * @param pool the namepool to be used
279:             */
280:            public void explain(NamePool pool) {
281:                System.err.println("declare variable "
282:                        + pool.getDisplayName(nameCode) + " := ");
283:                if (value != null) {
284:                    value.display(4, pool, System.err);
285:                }
286:                System.err.println(";");
287:            }
288:        }
289:
290:        //
291:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
292:        // you may not use this file except in compliance with the License. You may obtain a copy of the
293:        // License at http://www.mozilla.org/MPL/
294:        //
295:        // Software distributed under the License is distributed on an "AS IS" basis,
296:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
297:        // See the License for the specific language governing rights and limitations under the License.
298:        //
299:        // The Original Code is: all this file.
300:        //
301:        // The Initial Developer of the Original Code is Michael H. Kay
302:        //
303:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
304:        //
305:        // Contributor(s): none
306:        //
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