Source Code Cross Referenced for FixedElement.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.event.Receiver;
004:        import net.sf.saxon.expr.*;
005:        import net.sf.saxon.om.NamePool;
006:        import net.sf.saxon.om.QNameException;
007:        import net.sf.saxon.om.Validation;
008:        import net.sf.saxon.pattern.CombinedNodeTest;
009:        import net.sf.saxon.pattern.ContentTypeTest;
010:        import net.sf.saxon.pattern.NameTest;
011:        import net.sf.saxon.style.StandardNames;
012:        import net.sf.saxon.trace.InstructionInfo;
013:        import net.sf.saxon.trace.Location;
014:        import net.sf.saxon.trans.StaticError;
015:        import net.sf.saxon.trans.XPathException;
016:        import net.sf.saxon.type.*;
017:        import net.sf.saxon.value.StringValue;
018:
019:        import java.io.PrintStream;
020:        import java.util.Iterator;
021:
022:        /**
023:         * An instruction that creates an element node whose name is known statically.
024:         * Used for literal results elements in XSLT, for direct element constructors
025:         * in XQuery, and for xsl:element in cases where the name and namespace are
026:         * known statically.
027:         */
028:
029:        public class FixedElement extends ElementCreator {
030:
031:            private int nameCode;
032:            protected int[] namespaceCodes = null;
033:            private ItemType itemType;
034:
035:            /**
036:             * Create an instruction that creates a new element node
037:             * @param nameCode Represents the name of the element node
038:             * @param namespaceCodes List of namespaces to be added to the element node.
039:             *                       May be null if none are required.
040:             * @param inheritNamespaces true if the children of this element are to inherit its namespaces
041:             * @param schemaType Type annotation for the new element node
042:             */
043:            public FixedElement(int nameCode, int[] namespaceCodes,
044:                    boolean inheritNamespaces, SchemaType schemaType,
045:                    int validation) {
046:                this .nameCode = nameCode;
047:                this .namespaceCodes = namespaceCodes;
048:                this .inheritNamespaces = inheritNamespaces;
049:                setSchemaType(schemaType);
050:                this .validation = validation;
051:            }
052:
053:            public InstructionInfo getInstructionInfo() {
054:                InstructionDetails details = (InstructionDetails) super 
055:                        .getInstructionInfo();
056:                details.setConstructType(Location.LITERAL_RESULT_ELEMENT);
057:                details.setObjectNameCode(nameCode);
058:                return details;
059:            }
060:
061:            /**
062:             * Simplify an expression. This performs any static optimization (by rewriting the expression
063:             * as a different expression).
064:             *
065:             * @return the simplified expression
066:             * @throws net.sf.saxon.trans.XPathException
067:             *          if an error is discovered during expression rewriting
068:             */
069:
070:            public Expression simplify(StaticContext env) throws XPathException {
071:                setLazyConstruction(env.getConfiguration()
072:                        .isLazyConstructionMode());
073:                if (getSchemaType() == null) {
074:                    if (validation == Validation.STRICT) {
075:                        SchemaDeclaration decl = env.getConfiguration()
076:                                .getElementDeclaration(nameCode & 0xfffff);
077:                        if (decl == null) {
078:                            StaticError err = new StaticError(
079:                                    "There is no global element declaration for "
080:                                            + env.getNamePool().getDisplayName(
081:                                                    nameCode)
082:                                            + ", so strict validation will fail");
083:                            err.setIsTypeError(true);
084:                            err.setLocator(this );
085:                            throw err;
086:                        }
087:                        setSchemaType(decl.getType());
088:                        itemType = new CombinedNodeTest(new NameTest(
089:                                Type.ELEMENT, nameCode, env.getNamePool()),
090:                                Token.INTERSECT, new ContentTypeTest(
091:                                        Type.ELEMENT, getSchemaType(), env
092:                                                .getConfiguration()));
093:                        getSchemaType().analyzeContentExpression(content,
094:                                Type.ELEMENT, env);
095:                        SchemaType xsiType = getXSIType(env);
096:                        if (xsiType != null) {
097:                            xsiType.analyzeContentExpression(content,
098:                                    Type.ELEMENT, env);
099:                            try {
100:                                xsiType.isTypeDerivationOK(getSchemaType(), 0);
101:                            } catch (SchemaException e) {
102:                                throw new StaticError(
103:                                        "The specified xsi:type "
104:                                                + xsiType.getDescription()
105:                                                + " is not validly derived from the required type "
106:                                                + getSchemaType()
107:                                                        .getDescription());
108:                            }
109:                        }
110:                    } else if (validation == Validation.LAX) {
111:                        SchemaDeclaration decl = env.getConfiguration()
112:                                .getElementDeclaration(nameCode & 0xfffff);
113:                        if (decl == null) {
114:                            env
115:                                    .issueWarning(
116:                                            "There is no global element declaration for "
117:                                                    + env.getNamePool()
118:                                                            .getDisplayName(
119:                                                                    nameCode)
120:                                                    + ", so lax validation has no effect",
121:                                            this );
122:                            itemType = new CombinedNodeTest(
123:                                    new NameTest(Type.ELEMENT, nameCode, env
124:                                            .getNamePool()),
125:                                    Token.INTERSECT,
126:                                    new ContentTypeTest(
127:                                            Type.ELEMENT,
128:                                            BuiltInSchemaFactory
129:                                                    .getSchemaType(StandardNames.XDT_UNTYPED),
130:                                            env.getConfiguration()));
131:                        } else {
132:                            setSchemaType(decl.getType());
133:                            itemType = new CombinedNodeTest(new NameTest(
134:                                    Type.ELEMENT, nameCode, env.getNamePool()),
135:                                    Token.INTERSECT, new ContentTypeTest(
136:                                            Type.ELEMENT, getSchemaType(), env
137:                                                    .getConfiguration()));
138:                            getSchemaType().analyzeContentExpression(content,
139:                                    Type.ELEMENT, env);
140:                        }
141:                    } else if (validation == Validation.PRESERVE) {
142:                        // we know the result will be an element of type xs:anyType
143:                        itemType = new CombinedNodeTest(
144:                                new NameTest(Type.ELEMENT, nameCode, env
145:                                        .getNamePool()),
146:                                Token.INTERSECT,
147:                                new ContentTypeTest(
148:                                        Type.ELEMENT,
149:                                        BuiltInSchemaFactory
150:                                                .getSchemaType(StandardNames.XS_ANY_TYPE),
151:                                        env.getConfiguration()));
152:                    } else {
153:                        // we know the result will be an untyped element
154:                        itemType = new CombinedNodeTest(
155:                                new NameTest(Type.ELEMENT, nameCode, env
156:                                        .getNamePool()),
157:                                Token.INTERSECT,
158:                                new ContentTypeTest(
159:                                        Type.ELEMENT,
160:                                        BuiltInSchemaFactory
161:                                                .getSchemaType(StandardNames.XDT_UNTYPED),
162:                                        env.getConfiguration()));
163:                    }
164:                } else {
165:                    itemType = new CombinedNodeTest(new NameTest(Type.ELEMENT,
166:                            nameCode, env.getNamePool()), Token.INTERSECT,
167:                            new ContentTypeTest(Type.ELEMENT, getSchemaType(),
168:                                    env.getConfiguration()));
169:                    getSchemaType().analyzeContentExpression(content,
170:                            Type.ELEMENT, env);
171:                }
172:                return super .simplify(env);
173:            }
174:
175:            /**
176:             * Get the type of the item returned by this instruction
177:             * @return the item type
178:             * @param th
179:             */
180:            public ItemType getItemType(TypeHierarchy th) {
181:                if (itemType == null) {
182:                    return super .getItemType(th);
183:                }
184:                return itemType;
185:            }
186:
187:            /**
188:             * Callback from the superclass ElementCreator to get the nameCode
189:             * for the element name
190:             * @param context The evaluation context (not used)
191:             * @return the name code for the element name
192:             */
193:
194:            public int getNameCode(XPathContext context) {
195:                return nameCode;
196:            }
197:
198:            /**
199:             * Determine whether the element constructor creates a fixed xsi:type attribute, and if so, return the
200:             * relevant type.
201:             * @return the type denoted by the constructor's xsi:type attribute if there is one.
202:             * Return null if there is no xsi:type attribute, or if the value of the xsi:type
203:             * attribute is a type that is not statically known (this is allowed)
204:             * @throws XPathException if there is an xsi:type attribute and its value is not a QName.
205:             */
206:
207:            public SchemaType getXSIType(StaticContext env)
208:                    throws XPathException {
209:                if (content instanceof  FixedAttribute) {
210:                    return testForXSIType((FixedAttribute) content, env);
211:                } else if (content instanceof  Block) {
212:                    Iterator iter = content.iterateSubExpressions();
213:                    while (iter.hasNext()) {
214:                        Expression exp = (Expression) iter.next();
215:                        if (exp instanceof  FixedAttribute) {
216:                            SchemaType type = testForXSIType(
217:                                    (FixedAttribute) exp, env);
218:                            if (type != null) {
219:                                return type;
220:                            }
221:                        }
222:                    }
223:                    return null;
224:                } else {
225:                    return null;
226:                }
227:            }
228:
229:            private SchemaType testForXSIType(FixedAttribute fat,
230:                    StaticContext env) throws XPathException {
231:                int att = fat.evaluateNameCode(null) & NamePool.FP_MASK;
232:                if (att == StandardNames.XSI_TYPE) {
233:                    Expression attValue = fat.getSelect();
234:                    if (attValue instanceof  StringValue) {
235:                        try {
236:                            NamePool pool = env.getNamePool();
237:                            String[] parts = env.getConfiguration()
238:                                    .getNameChecker().getQNameParts(
239:                                            ((StringValue) attValue)
240:                                                    .getStringValue());
241:                            // The only namespace bindings we can trust are those declared on this element
242:                            int uriCode = -1;
243:                            for (int n = 0; n < namespaceCodes.length; n++) {
244:                                String prefix = pool
245:                                        .getPrefixFromNamespaceCode(namespaceCodes[n]);
246:                                if (prefix.equals(parts[0])) {
247:                                    uriCode = namespaceCodes[n] & 0xffff;
248:                                    break;
249:                                }
250:                            }
251:                            if (uriCode == -1) {
252:                                return null;
253:                            }
254:                            String uri = pool
255:                                    .getURIFromURICode((short) uriCode);
256:                            int typefp = pool.allocate(parts[0], uri, parts[1])
257:                                    & NamePool.FP_MASK;
258:                            SchemaType type = env.getConfiguration()
259:                                    .getSchemaType(typefp);
260:                            return type;
261:                        } catch (QNameException e) {
262:                            throw new StaticError(e.getMessage());
263:                        }
264:                    }
265:                }
266:                return null;
267:            }
268:
269:            /**
270:             * Check that any elements and attributes constructed or returned by this expression are acceptable
271:             * in the content model of a given complex type. It's always OK to say yes, since the check will be
272:             * repeated at run-time. The process of checking element and attribute constructors against the content
273:             * model of a complex type also registers the type of content expected of those constructors, so the
274:             * static validation can continue recursively.
275:             */
276:
277:            public void checkPermittedContents(SchemaType parentType,
278:                    StaticContext env, boolean whole) throws XPathException {
279:                if (parentType instanceof  SimpleType) {
280:                    StaticError err = new StaticError(
281:                            "Element "
282:                                    + env.getNamePool()
283:                                            .getDisplayName(nameCode)
284:                                    + " is not permitted here: the containing element is of simple type "
285:                                    + parentType.getDescription());
286:                    err.setIsTypeError(true);
287:                    err.setLocator(this );
288:                    throw err;
289:                } else if (((ComplexType) parentType).isSimpleContent()) {
290:                    StaticError err = new StaticError(
291:                            "Element "
292:                                    + env.getNamePool()
293:                                            .getDisplayName(nameCode)
294:                                    + " is not permitted here: the containing element has a complex type with simple content");
295:                    err.setIsTypeError(true);
296:                    err.setLocator(this );
297:                    throw err;
298:                }
299:                SchemaType type;
300:                try {
301:                    type = ((ComplexType) parentType)
302:                            .getElementParticleType(nameCode & 0xfffff);
303:                } catch (SchemaException e) {
304:                    throw new StaticError(e);
305:                }
306:                if (type == null) {
307:                    StaticError err = new StaticError(
308:                            "Element "
309:                                    + env.getNamePool()
310:                                            .getDisplayName(nameCode)
311:                                    + " is not permitted in the content model of the complex type "
312:                                    + parentType.getDescription());
313:                    err.setIsTypeError(true);
314:                    err.setLocator(this );
315:                    throw err;
316:                }
317:                if (type instanceof  AnyType) {
318:                    return;
319:                }
320:
321:                try {
322:                    content.checkPermittedContents(type, env, true);
323:                } catch (XPathException e) {
324:                    if (e.getLocator() == null || e.getLocator() == e) {
325:                        e.setLocator(this );
326:                    }
327:                    throw e;
328:                }
329:            }
330:
331:            /**
332:             * Callback from the superclass ElementCreator to output the namespace nodes
333:             * @param context The evaluation context (not used)
334:             * @param out The receiver to handle the output
335:             */
336:
337:            protected void outputNamespaceNodes(XPathContext context,
338:                    Receiver out) throws XPathException {
339:                if (namespaceCodes != null) {
340:                    for (int i = 0; i < namespaceCodes.length; i++) {
341:                        out.namespace(namespaceCodes[i], 0);
342:                    }
343:                }
344:            }
345:
346:            /**
347:             * Callback to get a list of the intrinsic namespaces that need to be generated for the element.
348:             * The result is an array of namespace codes, the codes either occupy the whole array or are
349:             * terminated by a -1 entry. A result of null is equivalent to a zero-length array.
350:             */
351:
352:            public int[] getActiveNamespaces() throws XPathException {
353:                return namespaceCodes;
354:            }
355:
356:            /**
357:             * Display this instruction as an expression, for diagnostics
358:             */
359:
360:            public void display(int level, NamePool pool, PrintStream out) {
361:                out.println(ExpressionTool.indent(level) + "element ");
362:                out.println(ExpressionTool.indent(level + 1)
363:                        + "name "
364:                        + (pool == null ? nameCode + "" : pool
365:                                .getDisplayName(nameCode)));
366:                out.println(ExpressionTool.indent(level + 1) + "content");
367:                content.display(level + 1, pool, out);
368:            }
369:        }
370:
371:        //
372:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
373:        // you may not use this file except in compliance with the License. You may obtain a copy of the
374:        // License at http://www.mozilla.org/MPL/
375:        //
376:        // Software distributed under the License is distributed on an "AS IS" basis,
377:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
378:        // See the License for the specific language governing rights and limitations under the License.
379:        //
380:        // The Original Code is: all this file.
381:        //
382:        // The Initial Developer of the Original Code is Michael H. Kay.
383:        //
384:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
385:        //
386:        // Contributor(s): none.
387:        //
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