Source Code Cross Referenced for ComputedElement.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.event.Receiver;
006:        import net.sf.saxon.expr.*;
007:        import net.sf.saxon.om.*;
008:        import net.sf.saxon.pattern.ContentTypeTest;
009:        import net.sf.saxon.pattern.NodeKindTest;
010:        import net.sf.saxon.style.StandardNames;
011:        import net.sf.saxon.trans.DynamicError;
012:        import net.sf.saxon.trans.StaticError;
013:        import net.sf.saxon.trans.XPathException;
014:        import net.sf.saxon.type.*;
015:        import net.sf.saxon.value.QNameValue;
016:        import net.sf.saxon.value.StringValue;
017:        import net.sf.saxon.value.SequenceType;
018:        import net.sf.saxon.value.AtomicValue;
019:
020:        import java.io.PrintStream;
021:        import java.util.ArrayList;
022:        import java.util.Iterator;
023:
024:        /**
025:         * An instruction representing an xsl:element element in an XSLT stylesheet,
026:         * or a computed element constructor in XQuery. (In both cases, if the element name
027:         * is expressed as a compile-time expression, then a FixedElement instruction
028:         * is used instead.)
029:         * @see FixedElement
030:         */
031:
032:        public class ComputedElement extends ElementCreator {
033:
034:            private Expression elementName;
035:            private Expression namespace = null;
036:            private NamespaceResolver nsContext;
037:            private boolean allowNameAsQName;
038:            private ItemType itemType;
039:
040:            /**
041:             * Create an instruction that creates a new element node
042:             *
043:             * @param elementName      Expression that evaluates to produce the name of the
044:             *                         element node as a lexical QName
045:             * @param namespace        Expression that evaluates to produce the namespace URI of
046:             *                         the element node. Set to null if the namespace is to be deduced from the prefix
047:             *                         of the elementName.
048:             * @param nsContext        Saved copy of the static namespace context for the instruction.
049:             *                         Can be set to null if namespace is supplied.
050:             * @param schemaType       The required schema type for the content
051:             * @param allowQName
052:             */
053:            public ComputedElement(Expression elementName,
054:                    Expression namespace, NamespaceResolver nsContext,
055:                    SchemaType schemaType, int validation,
056:                    boolean inheritNamespaces, boolean allowQName) {
057:                this .elementName = elementName;
058:                this .namespace = namespace;
059:                this .nsContext = nsContext;
060:                setSchemaType(schemaType);
061:                this .validation = validation;
062:                this .inheritNamespaces = inheritNamespaces;
063:                this .allowNameAsQName = allowQName;
064:                adoptChildExpression(elementName);
065:                adoptChildExpression(namespace);
066:            }
067:
068:            public Expression simplify(StaticContext env) throws XPathException {
069:                elementName = elementName.simplify(env);
070:                if (namespace != null) {
071:                    namespace = namespace.simplify(env);
072:                }
073:                Configuration config = env.getConfiguration();
074:                setLazyConstruction(config.isLazyConstructionMode());
075:
076:                if (getSchemaType() != null) {
077:                    itemType = new ContentTypeTest(Type.ELEMENT,
078:                            getSchemaType(), config);
079:                    getSchemaType().analyzeContentExpression(content,
080:                            Type.ELEMENT, env);
081:                } else if (validation == Validation.STRIP
082:                        || !config.isSchemaAware(Configuration.XML_SCHEMA)) {
083:                    itemType = new ContentTypeTest(Type.ELEMENT,
084:                            BuiltInSchemaFactory
085:                                    .getSchemaType(StandardNames.XDT_UNTYPED),
086:                            config);
087:                } else {
088:                    // paradoxically, we know less about the type if validation="strict" is specified!
089:                    // We know that it won't be untyped, but we have no way of representing that.
090:                    itemType = NodeKindTest.ELEMENT;
091:                }
092:                return super .simplify(env);
093:            }
094:
095:            public Expression typeCheck(StaticContext env,
096:                    ItemType contextItemType) throws XPathException {
097:                elementName = elementName.typeCheck(env, contextItemType);
098:                adoptChildExpression(elementName);
099:                RoleLocator role = new RoleLocator(RoleLocator.INSTRUCTION,
100:                        "element/name", 0, null);
101:                role.setSourceLocator(this );
102:                if (allowNameAsQName) {
103:                    // Can only happen in XQuery
104:                    elementName = TypeChecker.staticTypeCheck(elementName,
105:                            SequenceType.SINGLE_ATOMIC, false, role, env);
106:                } else {
107:                    elementName = TypeChecker.staticTypeCheck(elementName,
108:                            SequenceType.SINGLE_STRING, false, role, env);
109:                }
110:                if (namespace != null) {
111:                    namespace = namespace.typeCheck(env, contextItemType);
112:                    adoptChildExpression(namespace);
113:
114:                    role = new RoleLocator(RoleLocator.INSTRUCTION,
115:                            "attribute/namespace", 0, null);
116:                    role.setSourceLocator(this );
117:                    namespace = TypeChecker.staticTypeCheck(namespace,
118:                            SequenceType.SINGLE_STRING, false, role, env);
119:                }
120:                return super .typeCheck(env, contextItemType);
121:            }
122:
123:            /**
124:             * Get the item type of the value returned by this instruction
125:             *
126:             * @return the item type
127:             * @param th
128:             */
129:
130:            public ItemType getItemType(TypeHierarchy th) {
131:                if (itemType == null) {
132:                    return super .getItemType(th);
133:                }
134:                return itemType;
135:            }
136:
137:            public Iterator iterateSubExpressions() {
138:                ArrayList list = new ArrayList(8);
139:                list.add(content);
140:                list.add(elementName);
141:                if (namespace != null) {
142:                    list.add(namespace);
143:                }
144:                return list.iterator();
145:            }
146:
147:            /**
148:             * Offer promotion for subexpressions. The offer will be accepted if the subexpression
149:             * is not dependent on the factors (e.g. the context item) identified in the PromotionOffer.
150:             * By default the offer is not accepted - this is appropriate in the case of simple expressions
151:             * such as constant values and variable references where promotion would give no performance
152:             * advantage. This method is always called at compile time.
153:             *
154:             * @param offer details of the offer, for example the offer to move
155:             *              expressions that don't depend on the context to an outer level in
156:             *              the containing expression
157:             * @throws net.sf.saxon.trans.XPathException if any error is detected
158:             */
159:
160:            protected void promoteInst(PromotionOffer offer)
161:                    throws XPathException {
162:                elementName = doPromotion(elementName, offer);
163:                if (namespace != null) {
164:                    namespace = doPromotion(namespace, offer);
165:                }
166:                super .promoteInst(offer);
167:            }
168:
169:            /**
170:             * Check that any elements and attributes constructed or returned by this expression are acceptable
171:             * in the content model of a given complex type. It's always OK to say yes, since the check will be
172:             * repeated at run-time. The process of checking element and attribute constructors against the content
173:             * model of a complex type also registers the type of content expected of those constructors, so the
174:             * static validation can continue recursively.
175:             */
176:
177:            public void checkPermittedContents(SchemaType parentType,
178:                    StaticContext env, boolean whole) throws XPathException {
179:                if (parentType instanceof  SimpleType) {
180:                    StaticError err = new StaticError(
181:                            "Elements are not permitted here: the containing element has the simple type "
182:                                    + parentType.getDescription());
183:                    err.setIsTypeError(true);
184:                    err.setLocator(this );
185:                    throw err;
186:                } else if (((ComplexType) parentType).isSimpleContent()) {
187:                    StaticError err = new StaticError(
188:                            "Elements are not permitted here: the containing element has a complex type with simple content");
189:                    err.setIsTypeError(true);
190:                    err.setLocator(this );
191:                    throw err;
192:                }
193:                // NOTE: we could in principle check that if all the elements permitted in the content of the parentType
194:                // themselves have a simple type (not uncommon, perhaps) then this element must not have element content.
195:            }
196:
197:            /**
198:             * Callback from the superclass ElementCreator to get the nameCode
199:             * for the element name
200:             *
201:             * @param context The evaluation context (not used)
202:             * @return the name code for the element name
203:             */
204:
205:            public int getNameCode(XPathContext context) throws XPathException,
206:                    XPathException {
207:
208:                Controller controller = context.getController();
209:                NamePool pool = controller.getNamePool();
210:
211:                String prefix;
212:                String localName;
213:                String uri;
214:
215:                // name needs to be evaluated at run-time
216:                AtomicValue nameValue = (AtomicValue) elementName
217:                        .evaluateItem(context);
218:                nameValue = nameValue.getPrimitiveValue();
219:                if (nameValue instanceof  StringValue) { // which includes UntypedAtomic
220:                    // this will always be the case in XSLT
221:                    CharSequence rawName = nameValue.getStringValueCS();
222:                    try {
223:                        String[] parts = controller.getConfiguration()
224:                                .getNameChecker().getQNameParts(rawName);
225:                        prefix = parts[0];
226:                        localName = parts[1];
227:                    } catch (QNameException err) {
228:                        DynamicError err1 = new DynamicError(
229:                                "Invalid element name. " + err.getMessage(),
230:                                this );
231:                        err1.setErrorCode((isXSLT(context) ? "XTDE0820"
232:                                : "XQDY0074"));
233:                        err1.setXPathContext(context);
234:                        throw dynamicError(this , err1, context);
235:                    }
236:                } else if (nameValue instanceof  QNameValue && allowNameAsQName) {
237:                    // this is allowed in XQuery
238:                    localName = ((QNameValue) nameValue).getLocalName();
239:                    uri = ((QNameValue) nameValue).getNamespaceURI();
240:                    namespace = new StringValue(uri);
241:                    prefix = ((QNameValue) nameValue).getPrefix();
242:                } else {
243:                    DynamicError err = new DynamicError(
244:                            "Computed element name has incorrect type");
245:                    err
246:                            .setErrorCode((isXSLT(context) ? "XTDE0820"
247:                                    : "XPTY0004"));
248:                    err.setIsTypeError(true);
249:                    err.setXPathContext(context);
250:                    throw dynamicError(this , err, context);
251:                }
252:
253:                if (namespace == null) {
254:                    uri = nsContext.getURIForPrefix(prefix, true);
255:                    if (uri == null) {
256:                        DynamicError err = new DynamicError(
257:                                "Undeclared prefix in element name: " + prefix,
258:                                this );
259:                        err.setErrorCode((isXSLT(context) ? "XTDE0830"
260:                                : "XQDY0074"));
261:                        err.setXPathContext(context);
262:                        throw dynamicError(this , err, context);
263:                    }
264:
265:                } else {
266:                    uri = namespace.evaluateAsString(context);
267:                    if (uri.equals("")) {
268:                        // there is a special rule for this case in the specification;
269:                        // we force the element to go in the null namespace
270:                        prefix = "";
271:                    }
272:                    if (prefix.equals("xmlns")) {
273:                        // this isn't a legal prefix so we mustn't use it
274:                        prefix = "x-xmlns";
275:                    }
276:                }
277:
278:                return pool.allocate(prefix, uri, localName);
279:
280:            }
281:
282:            /**
283:             * Callback to output namespace nodes for the new element.
284:             *
285:             * @param context The execution context
286:             * @param out     the Receiver where the namespace nodes are to be written
287:             * @throws XPathException
288:             */
289:            protected void outputNamespaceNodes(XPathContext context,
290:                    Receiver out) throws XPathException {
291:                // do nothing
292:            }
293:
294:            /**
295:             * Get the name of this instruction for diagnostic and tracing purposes
296:             */
297:
298:            public int getInstructionNameCode() {
299:                return StandardNames.XSL_ELEMENT;
300:            }
301:
302:            /**
303:             * Display this instruction as an expression, for diagnostics
304:             */
305:
306:            public void display(int level, NamePool pool, PrintStream out) {
307:                out.println(ExpressionTool.indent(level) + "element ");
308:                out.println(ExpressionTool.indent(level + 1) + "name");
309:                elementName.display(level + 2, pool, out);
310:                out.println(ExpressionTool.indent(level + 1) + "content");
311:                content.display(level + 1, pool, out);
312:            }
313:        }
314:
315:        //
316:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
317:        // you may not use this file except in compliance with the License. You may obtain a copy of the
318:        // License at http://www.mozilla.org/MPL/
319:        //
320:        // Software distributed under the License is distributed on an "AS IS" basis,
321:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
322:        // See the License for the specific language governing rights and limitations under the License.
323:        //
324:        // The Original Code is: all this file.
325:        //
326:        // The Initial Developer of the Original Code is Michael H. Kay.
327:        //
328:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
329:        //
330:        // Contributor(s): none.
331:        //
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