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

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


001:        package net.sf.saxon.instruct;
002:
003:        import net.sf.saxon.Configuration;
004:        import net.sf.saxon.Controller;
005:        import net.sf.saxon.expr.*;
006:        import net.sf.saxon.om.AxisIterator;
007:        import net.sf.saxon.om.SingletonIterator;
008:        import net.sf.saxon.om.ValueRepresentation;
009:        import net.sf.saxon.om.NamePool;
010:        import net.sf.saxon.style.StandardNames;
011:        import net.sf.saxon.trace.InstructionInfo;
012:        import net.sf.saxon.trans.DynamicError;
013:        import net.sf.saxon.trans.StaticError;
014:        import net.sf.saxon.trans.XPathException;
015:
016:        import java.util.ArrayList;
017:        import java.util.List;
018:        import java.util.Stack;
019:
020:        /**
021:         * A compiled global variable in a stylesheet or query. <br>
022:         */
023:
024:        public class GlobalVariable extends GeneralVariable implements 
025:                Container {
026:
027:            private Executable executable;
028:            private SlotManager stackFrameMap = null;
029:
030:            public GlobalVariable() {
031:            }
032:
033:            public Executable getExecutable() {
034:                return executable;
035:            }
036:
037:            public void setExecutable(Executable executable) {
038:                this .executable = executable;
039:            }
040:
041:            public void setContainsLocals(SlotManager map) {
042:                this .stackFrameMap = map;
043:            }
044:
045:            public boolean isGlobal() {
046:                return true;
047:            }
048:
049:            /**
050:             * Check for cycles in this variable definition
051:             * @param referees the calls leading up to this one; it's an error if this variable is on the
052:             * stack, because that means it calls itself directly or indirectly. The stack may contain
053:             * variable definitions (GlobalVariable objects) and user-defined functions (UserFunction objects).
054:             * It will never contain the same object more than once.
055:             */
056:
057:            public void lookForCycles(Stack referees) throws StaticError {
058:                if (referees.contains(this )) {
059:                    int s = referees.indexOf(this );
060:                    referees.push(this );
061:                    String message = "Circular definition of global variable. ";
062:                    NamePool pool = executable.getConfiguration().getNamePool();
063:                    for (int i = s; i < referees.size() - 1; i++) {
064:                        if (referees.get(i + 1) instanceof  GlobalVariable) {
065:                            GlobalVariable next = (GlobalVariable) referees
066:                                    .get(i + 1);
067:                            if (i == s) {
068:                                message += '$' + getVariableName() + " uses $"
069:                                        + next.getVariableName();
070:                            } else {
071:                                message += ", which uses $"
072:                                        + next.getVariableName();
073:                            }
074:                        } else if (referees.get(i + 1) instanceof  UserFunction) {
075:                            UserFunction next = (UserFunction) referees
076:                                    .get(i + 1);
077:                            message += ", which calls "
078:                                    + pool.getDisplayName(next
079:                                            .getFunctionNameCode()) + "()";
080:                        }
081:                    }
082:                    message += '.';
083:                    StaticError err = new StaticError(message);
084:                    err.setErrorCode("XQST0054");
085:                    err.setLocator(this );
086:                    throw err;
087:                }
088:                if (select != null) {
089:                    referees.push(this );
090:                    List list = new ArrayList(10);
091:                    ExpressionTool.gatherReferencedVariables(select, list);
092:                    for (int i = 0; i < list.size(); i++) {
093:                        Binding b = (Binding) list.get(i);
094:                        if (b instanceof  GlobalVariable) {
095:                            ((GlobalVariable) b).lookForCycles(referees);
096:                        }
097:                    }
098:                    list.clear();
099:                    ExpressionTool.gatherCalledFunctions(select, list);
100:                    for (int i = 0; i < list.size(); i++) {
101:                        UserFunction f = (UserFunction) list.get(i);
102:                        if (!referees.contains(f)) {
103:                            // recursive function calls are allowed
104:                            lookForFunctionCycles(f, referees);
105:                        }
106:                    }
107:                    referees.pop();
108:                }
109:            }
110:
111:            /**
112:             * Look for cyclic variable references that go via one or more function calls
113:             */
114:
115:            private static void lookForFunctionCycles(UserFunction f,
116:                    Stack referees) throws StaticError {
117:                Expression body = f.getBody();
118:                referees.push(f);
119:                List list = new ArrayList(10);
120:                ExpressionTool.gatherReferencedVariables(body, list);
121:                for (int i = 0; i < list.size(); i++) {
122:                    Binding b = (Binding) list.get(i);
123:                    if (b instanceof  GlobalVariable) {
124:                        ((GlobalVariable) b).lookForCycles(referees);
125:                    }
126:                }
127:                list.clear();
128:                ExpressionTool.gatherCalledFunctions(body, list);
129:                for (int i = 0; i < list.size(); i++) {
130:                    UserFunction fn = (UserFunction) list.get(i);
131:                    if (!referees.contains(fn)) {
132:                        // recursive function calls are allowed
133:                        lookForFunctionCycles(fn, referees);
134:                    }
135:                }
136:                referees.pop();
137:            }
138:
139:            /**
140:             * Process the variable declaration
141:             */
142:
143:            public TailCall processLeavingTail(XPathContext context)
144:                    throws XPathException {
145:
146:                // This code is not used. A global variable is not really an instruction, although
147:                // it is modelled as such, and it will be evaluated using the evaluateVariable() call
148:                return null;
149:            }
150:
151:            /**
152:             * Evaluate the variable. That is,
153:             * get the value of the select expression if present or the content
154:             * of the element otherwise, either as a tree or as a sequence
155:             */
156:
157:            public ValueRepresentation getSelectValue(XPathContext context)
158:                    throws XPathException {
159:                if (select == null) {
160:                    throw new AssertionError(
161:                            "*** No select expression for global variable!!");
162:                } else {
163:                    XPathContextMajor c2 = context.newCleanContext();
164:                    c2.setOrigin(this );
165:                    AxisIterator initialNode = SingletonIterator
166:                            .makeIterator(c2.getController()
167:                                    .getPrincipalSourceDocument());
168:                    initialNode.next();
169:                    c2.setCurrentIterator(initialNode);
170:                    if (stackFrameMap != null) {
171:                        c2.openStackFrame(stackFrameMap);
172:                    }
173:                    return ExpressionTool.lazyEvaluate(select, c2,
174:                            referenceCount);
175:                }
176:            }
177:
178:            /**
179:             * Evaluate the variable
180:             */
181:
182:            public ValueRepresentation evaluateVariable(XPathContext context)
183:                    throws XPathException {
184:                Controller controller = context.getController();
185:                Bindery b = controller.getBindery();
186:
187:                ValueRepresentation v = b.getGlobalVariableValue(this );
188:
189:                if (v != null) {
190:                    return v;
191:                } else {
192:
193:                    // This is the first reference to a global variable; try to evaluate it now.
194:                    // But first set a flag to stop looping. This flag is set in the Bindery because
195:                    // the VariableReference itself can be used by multiple threads simultaneously
196:
197:                    try {
198:                        b.setExecuting(this , true);
199:                        ValueRepresentation value = getSelectValue(context);
200:                        b.defineGlobalVariable(this , value);
201:                        b.setExecuting(this , false);
202:                        return value;
203:
204:                    } catch (XPathException err) {
205:                        b.setExecuting(this , false);
206:                        if (err instanceof  XPathException.Circularity) {
207:                            DynamicError e = new DynamicError(
208:                                    "Circular definition of variable "
209:                                            + getVariableName());
210:                            int lang = context.getController().getExecutable()
211:                                    .getHostLanguage();
212:                            e
213:                                    .setErrorCode(lang == Configuration.XQUERY ? "XQST0054"
214:                                            : "XTDE0640");
215:                            e.setXPathContext(context);
216:                            // Detect it more quickly the next time (in a pattern, the error is recoverable)
217:                            select = new ErrorExpression(e);
218:                            e.setLocator(this );
219:                            throw e;
220:                        } else {
221:                            throw err;
222:                        }
223:                    }
224:                }
225:            }
226:
227:            /**
228:             * Get InstructionInfo for this expression
229:             */
230:
231:            public InstructionInfo getInstructionInfo() {
232:                InstructionDetails details = new InstructionDetails();
233:                details.setConstructType(StandardNames.XSL_VARIABLE);
234:                details.setObjectNameCode(getVariableFingerprint());
235:                details.setProperty("expression", this );
236:                details.setSystemId(getSystemId());
237:                details.setLineNumber(getLineNumber());
238:                details.setColumnNumber(getColumnNumber());
239:                return details;
240:            }
241:
242:        }
243:
244:        //
245:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
246:        // you may not use this file except in compliance with the License. You may obtain a copy of the
247:        // License at http://www.mozilla.org/MPL/
248:        //
249:        // Software distributed under the License is distributed on an "AS IS" basis,
250:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
251:        // See the License for the specific language governing rights and limitations under the License.
252:        //
253:        // The Original Code is: all this file.
254:        //
255:        // The Initial Developer of the Original Code is Michael H. Kay.
256:        //
257:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
258:        //
259:        // Contributor(s): none.
260:        //
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