Source Code Cross Referenced for Assignation.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:        import net.sf.saxon.om.NamePool;
004:        import net.sf.saxon.om.ValueRepresentation;
005:        import net.sf.saxon.trans.XPathException;
006:        import net.sf.saxon.value.EmptySequence;
007:        import net.sf.saxon.value.MemoClosure;
008:
009:        import java.util.ArrayList;
010:        import java.util.Iterator;
011:        import java.util.List;
012:
013:        /**
014:         * Assignation is an abstract superclass for the kinds of expression
015:         * that declare range variables: for, some, and every.
016:         */
017:
018:        public abstract class Assignation extends ComputedExpression implements 
019:                Binding {
020:
021:            protected int slotNumber = -999; // slot number for range variable
022:            // (initialized to ensure a crash if no real slot is allocated)
023:            protected Expression sequence; // the expression over which the variable ranges
024:            protected Expression action; // the action performed for each value of the variable
025:            protected String variableName;
026:            protected int nameCode;
027:
028:            protected transient RangeVariableDeclaration declaration;
029:
030:            /**
031:             * Set the reference to the variable declaration
032:             */
033:
034:            public void setVariableDeclaration(RangeVariableDeclaration decl) {
035:                declaration = decl;
036:                nameCode = decl.getNameCode();
037:                variableName = decl.getVariableName();
038:            }
039:
040:            /**
041:             * Get the variable declaration
042:             */
043:
044:            public RangeVariableDeclaration getVariableDeclaration() {
045:                return declaration;
046:            }
047:
048:            /**
049:             * Add the "return" or "satisfies" expression, and fix up all references to the
050:             * range variable that occur within that expression
051:             * @param action the expression that occurs after the "return" keyword of a "for"
052:             * expression, the "satisfies" keyword of "some/every", or the ":=" operator of
053:             * a "let" expression.
054:             *
055:             * <p>This method must be called <b>after</b> calling setVariableDeclaration()</p>
056:             */
057:
058:            public void setAction(Expression action) {
059:                this .action = action;
060:                if (declaration != null) {
061:                    declaration.fixupReferences(this );
062:                }
063:                adoptChildExpression(action);
064:            }
065:
066:            /**
067:             * Indicate whether the binding is local or global. A global binding is one that has a fixed
068:             * value for the life of a query or transformation; any other binding is local.
069:             */
070:
071:            public final boolean isGlobal() {
072:                return false;
073:            }
074:
075:            /**
076:             * Test whether it is permitted to assign to the variable using the saxon:assign
077:             * extension element. This will only be for an XSLT global variable where the extra
078:             * attribute saxon:assignable="yes" is present.
079:             */
080:
081:            public final boolean isAssignable() {
082:                return false;
083:            }
084:
085:            /**
086:             * If this is a local variable held on the local stack frame, return the corresponding slot number.
087:             * In other cases, return -1.
088:             */
089:
090:            public int getLocalSlotNumber() {
091:                return slotNumber;
092:            }
093:
094:            /**
095:             * Get the action expression
096:             */
097:
098:            public Expression getAction() {
099:                return action;
100:            }
101:
102:            /**
103:             * Set the "sequence" expression - the one to which the variable is bound
104:             */
105:
106:            public void setSequence(Expression sequence) {
107:                this .sequence = sequence;
108:                adoptChildExpression(sequence);
109:            }
110:
111:            /**
112:             * Set the slot number for the range variable
113:             */
114:
115:            public void setSlotNumber(int nr) {
116:                slotNumber = nr;
117:            }
118:
119:            /**
120:             * Get the number of slots required. Normally 1, except for a FOR expression with an AT clause, where it is 2.
121:             */
122:
123:            public int getRequiredSlots() {
124:                return 1;
125:            }
126:
127:            /**
128:             * Simplify the expression
129:             */
130:
131:            public Expression simplify(StaticContext env) throws XPathException {
132:                sequence = sequence.simplify(env);
133:                action = action.simplify(env);
134:                return this ;
135:            }
136:
137:            /**
138:             * Promote this expression if possible
139:             */
140:
141:            public Expression promote(PromotionOffer offer)
142:                    throws XPathException {
143:                Expression exp = offer.accept(this );
144:                if (exp != null) {
145:                    return exp;
146:                } else {
147:                    sequence = doPromotion(sequence, offer);
148:                    if (offer.action == PromotionOffer.INLINE_VARIABLE_REFERENCES
149:                            || offer.action == PromotionOffer.UNORDERED
150:                            || offer.action == PromotionOffer.REPLACE_CURRENT) {
151:                        action = doPromotion(action, offer);
152:                    } else if (offer.action == PromotionOffer.RANGE_INDEPENDENT) {
153:                        // Pass the offer to the action expression only if the action isn't dependent on the
154:                        // variable bound by this assignation
155:                        Binding[] savedBindingList = offer.bindingList;
156:                        Binding[] newBindingList = extendBindingList(offer.bindingList);
157:                        offer.bindingList = newBindingList;
158:                        action = doPromotion(action, offer);
159:                        offer.bindingList = savedBindingList;
160:                    }
161:                    return this ;
162:                }
163:            }
164:
165:            /**
166:             * Suppress validation on contained element constructors, on the grounds that the parent element
167:             * is already performing validation. The default implementation does nothing.
168:             */
169:
170:            public void suppressValidation(int validationMode) {
171:                if (action instanceof  ComputedExpression) {
172:                    ((ComputedExpression) action)
173:                            .suppressValidation(validationMode);
174:                }
175:            }
176:
177:            /**
178:             * Extend an array of variable bindings to include the binding(s) defined in this expression
179:             */
180:
181:            protected Binding[] extendBindingList(Binding[] in) {
182:                Binding[] newBindingList = new Binding[in.length + 1];
183:                System.arraycopy(in, 0, newBindingList, 0, in.length);
184:                newBindingList[in.length] = this ;
185:                return newBindingList;
186:            }
187:
188:            /**
189:             * Promote a WHERE clause whose condition doesn't depend on the variable being bound.
190:             * This rewrites an expression of the form
191:             *
192:             * <p>let $i := SEQ return if (C) then R else ()</p>
193:             *
194:             * <p>to the form:</p>
195:             *
196:             * <p>if (C) then (let $i := SEQ return R) else ()
197:             */
198:
199:            protected Expression promoteWhereClause(Binding positionBinding) {
200:                if (action instanceof  IfExpression) {
201:                    Container container = getParentExpression();
202:                    IfExpression ifex = (IfExpression) action;
203:                    Expression condition = ifex.getCondition();
204:                    Expression elseex = ifex.getElseExpression();
205:                    if (elseex instanceof  EmptySequence) {
206:                        Binding[] bindingList;
207:                        if (positionBinding == null) {
208:                            Binding[] bl = { this  };
209:                            bindingList = bl;
210:                        } else {
211:                            Binding[] bl = { this , positionBinding };
212:                            bindingList = bl;
213:                        }
214:                        List list = new ArrayList(5);
215:                        Expression promotedCondition = null;
216:                        BooleanExpression.listAndComponents(condition, list);
217:                        for (int i = list.size() - 1; i >= 0; i--) {
218:                            Expression term = (Expression) list.get(i);
219:                            if (!ExpressionTool.dependsOnVariable(term,
220:                                    bindingList)) {
221:                                if (promotedCondition == null) {
222:                                    promotedCondition = term;
223:                                } else {
224:                                    promotedCondition = new BooleanExpression(
225:                                            term, Token.AND, promotedCondition);
226:                                }
227:                                list.remove(i);
228:                            }
229:                        }
230:                        if (promotedCondition != null) {
231:                            if (list.size() == 0) {
232:                                // the whole if() condition has been promoted
233:                                Expression oldThen = ifex.getThenExpression();
234:                                setAction(oldThen);
235:                                ifex.setParentExpression(container);
236:                                ifex.setThenExpression(this );
237:                                return ifex;
238:                            } else {
239:                                // one or more terms of the if() condition have been promoted
240:                                Expression retainedCondition = (Expression) list
241:                                        .get(0);
242:                                for (int i = 1; i < list.size(); i++) {
243:                                    retainedCondition = new BooleanExpression(
244:                                            retainedCondition, Token.AND,
245:                                            (Expression) list.get(i));
246:                                }
247:                                ifex.setCondition(retainedCondition);
248:                                IfExpression newIf = new IfExpression(
249:                                        promotedCondition, this , EmptySequence
250:                                                .getInstance());
251:                                newIf.setParentExpression(container);
252:                                return newIf;
253:                            }
254:                        }
255:
256:                    }
257:                }
258:                return null;
259:            }
260:
261:            /**
262:             * Get the immediate subexpressions of this expression
263:             */
264:
265:            public Iterator iterateSubExpressions() {
266:                return new PairIterator(sequence, action);
267:            }
268:
269:            // Following methods implement the VariableDeclaration interface, in relation to the range
270:            // variable
271:
272:            public int getVariableNameCode() {
273:                return nameCode;
274:            }
275:
276:            public int getVariableFingerprint() {
277:                return nameCode & 0xfffff;
278:            }
279:
280:            /**
281:             * Get the display name of the range variable, for diagnostics only
282:             */
283:
284:            public String getVariableName(NamePool pool) {
285:                if (variableName == null) {
286:                    return "zz:var" + hashCode();
287:                } else {
288:                    return variableName;
289:                }
290:            }
291:
292:            /**
293:             * Get the value of the range variable
294:             */
295:
296:            public ValueRepresentation evaluateVariable(XPathContext context)
297:                    throws XPathException {
298:                ValueRepresentation actual = context
299:                        .evaluateLocalVariable(slotNumber);
300:                if (actual instanceof  MemoClosure
301:                        && ((MemoClosure) actual).isFullyRead()) {
302:                    actual = ((MemoClosure) actual).materialize();
303:                    context.setLocalVariable(slotNumber, actual);
304:                }
305:                return actual;
306:            }
307:
308:        }
309:
310:        //
311:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
312:        // you may not use this file except in compliance with the License. You may obtain a copy of the
313:        // License at http://www.mozilla.org/MPL/
314:        //
315:        // Software distributed under the License is distributed on an "AS IS" basis,
316:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
317:        // See the License for the specific language governing rights and limitations under the License.
318:        //
319:        // The Original Code is: all this file.
320:        //
321:        // The Initial Developer of the Original Code is Michael H. Kay
322:        //
323:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
324:        //
325:        // Contributor(s): none.
326:        //
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