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

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


001:        package net.sf.saxon.value;
002:
003:        import net.sf.saxon.Configuration;
004:        import net.sf.saxon.expr.StaticContext;
005:        import net.sf.saxon.expr.XPathContext;
006:        import net.sf.saxon.functions.Component;
007:        import net.sf.saxon.om.NameChecker;
008:        import net.sf.saxon.om.NamePool;
009:        import net.sf.saxon.om.QNameException;
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:
016:        import java.lang.reflect.Constructor;
017:        import java.lang.reflect.InvocationTargetException;
018:
019:        /**
020:         * A QName value. This implements the so-called "triples proposal", in which the prefix is retained as
021:         * part of the value. The prefix is not used in any operation on a QName other than conversion of the
022:         * QName to a string.
023:         */
024:
025:        public class QNameValue extends AtomicValue {
026:
027:            private String prefix; // "" for the default prefix
028:            private String uri; // "" for the null namespace
029:            private String localPart;
030:
031:            // Note: an alternative design was considered in which the QName was represented by a NamePool and a
032:            // nameCode. This caused difficulties because there is not always enough context information available
033:            // when creating a QName to locate the NamePool.
034:
035:            /**
036:             * Constructor
037:             * @param namePool The name pool containing the specified name code
038:             * @param nameCode The name code identifying this name in the name pool
039:             */
040:
041:            public QNameValue(NamePool namePool, int nameCode) {
042:                prefix = namePool.getPrefix(nameCode);
043:                uri = namePool.getURI(nameCode);
044:                localPart = namePool.getLocalName(nameCode);
045:            }
046:
047:            /**
048:             * Constructor. This constructor validates that the local part is a valid NCName.
049:             * @param prefix The prefix part of the QName (not used in comparisons). Use null or "" to represent the
050:             * default prefix.
051:             * @param uri The namespace part of the QName. Use null or "" to represent the null namespace.
052:             * @param localName The local part of the QName
053:             * @param checker NameChecker used to check the name against XML 1.0 or XML 1.1 rules. Supply null
054:             * if the name does not need to be checked (the caller asserts that it is known to be valid)
055:             */
056:
057:            public QNameValue(String prefix, String uri, String localName,
058:                    NameChecker checker) throws XPathException {
059:                if (checker != null && !checker.isValidNCName(localName)) {
060:                    DynamicError err = new DynamicError(
061:                            "Malformed local name in QName: '" + localName
062:                                    + '\'');
063:                    err.setErrorCode("FORG0001");
064:                    throw err;
065:                }
066:                this .prefix = (prefix == null ? "" : prefix);
067:                this .uri = (uri == null ? "" : uri);
068:                if (checker != null && this .uri.equals("")
069:                        && !this .prefix.equals("")) {
070:                    DynamicError err = new DynamicError(
071:                            "QName has null namespace but non-empty prefix");
072:                    err.setErrorCode("FOCA0002");
073:                    throw err;
074:                }
075:                this .localPart = localName;
076:            }
077:
078:            /**
079:             * Create a QName value (possibly a DerivedAtomicValue derived from QName) from
080:             * a string literal, given a namespace context
081:             * @param operand the input string
082:             * @param targetType the type required: QName, or a type derived from QName or NOTATION
083:             * @param env the static context, including the namespace context
084:             * @return the value after conversion
085:             * @throws XPathException if the name is lexically invalid or uses an undeclared prefix
086:             */
087:
088:            public static AtomicValue castToQName(StringValue operand,
089:                    AtomicType targetType, StaticContext env)
090:                    throws XPathException {
091:                try {
092:                    CharSequence arg = operand.getStringValueCS();
093:                    String parts[] = env.getConfiguration().getNameChecker()
094:                            .getQNameParts(arg);
095:                    String uri;
096:                    if ("".equals(parts[0])) {
097:                        uri = "";
098:                    } else {
099:                        uri = env.getURIForPrefix(parts[0]);
100:                        if (uri == null) {
101:                            StaticError e = new StaticError("Prefix '"
102:                                    + parts[0] + "' has not been declared");
103:                            throw e;
104:                        }
105:                    }
106:                    final TypeHierarchy th = env.getNamePool()
107:                            .getTypeHierarchy();
108:                    if (targetType.getFingerprint() == StandardNames.XS_QNAME) {
109:                        return new QNameValue(parts[0], uri, parts[1], null);
110:                    } else if (th.isSubType(targetType, Type.QNAME_TYPE)) {
111:                        QNameValue q = new QNameValue(parts[0], uri, parts[1],
112:                                null);
113:                        AtomicValue av = targetType.makeDerivedValue(q, arg,
114:                                true);
115:                        if (av instanceof  ValidationErrorValue) {
116:                            throw ((ValidationErrorValue) av).getException();
117:                        }
118:                        return av;
119:                    } else {
120:                        NotationValue n = new NotationValue(parts[0], uri,
121:                                parts[1], null);
122:                        AtomicValue av = targetType.makeDerivedValue(n, arg,
123:                                true);
124:                        if (av instanceof  ValidationErrorValue) {
125:                            throw ((ValidationErrorValue) av).getException();
126:                        }
127:                        return av;
128:                    }
129:                } catch (QNameException err) {
130:                    StaticError e = new StaticError(err);
131:                    throw e;
132:                }
133:            }
134:
135:            /**
136:             * Get the string value as a String. Returns the QName as a lexical QName, retaining the original
137:             * prefix if available.
138:             */
139:
140:            public String getStringValue() {
141:                if ("".equals(prefix)) {
142:                    return localPart;
143:                } else {
144:                    return prefix + ':' + localPart;
145:                }
146:            }
147:
148:            /**
149:             * Get the value as a JAXP QName
150:             */
151:
152:            //    public QName getQName() {
153:            //        return new QName(uri, localPart, prefix);
154:            //    }
155:            /**
156:             * Get the name in Clark notation, that is {uri}local
157:             */
158:
159:            public String getClarkName() {
160:                if ("".equals(uri)) {
161:                    return localPart;
162:                } else {
163:                    return '{' + uri + '}' + localPart;
164:                }
165:            }
166:
167:            /**
168:             * Get the local part
169:             */
170:
171:            public String getLocalName() {
172:                return localPart;
173:            }
174:
175:            /**
176:             * Get the namespace part (null means no namespace)
177:             */
178:
179:            public String getNamespaceURI() {
180:                return ("".equals(uri) ? null : uri);
181:            }
182:
183:            /**
184:             * Get the prefix
185:             */
186:
187:            public String getPrefix() {
188:                return prefix;
189:            }
190:
191:            /**
192:             * Allocate a nameCode for this QName in the NamePool
193:             * @param pool the NamePool to be used
194:             * @return the allocated nameCode
195:             */
196:
197:            public int allocateNameCode(NamePool pool) {
198:                return pool.allocate(prefix, uri, localPart);
199:            }
200:
201:            /**
202:             * Get a component. Returns a zero-length string if the namespace-uri component is
203:             * requested and is not present.
204:             * @param part either Component.LOCALNAME or Component.NAMESPACE indicating which
205:             * component of the value is required
206:             * @return either the local name or the namespace URI, in each case as a StringValue
207:             */
208:
209:            public AtomicValue getComponent(int part) {
210:                if (part == Component.LOCALNAME) {
211:                    return RestrictedStringValue.makeRestrictedString(
212:                            localPart, StandardNames.XS_NCNAME, null);
213:                } else if (part == Component.NAMESPACE) {
214:                    return new AnyURIValue(uri);
215:                } else if (part == Component.PREFIX) {
216:                    if ("".equals(prefix)) {
217:                        return null;
218:                    } else {
219:                        return RestrictedStringValue.makeRestrictedString(
220:                                prefix, StandardNames.XS_NCNAME, null);
221:                    }
222:                } else {
223:                    throw new UnsupportedOperationException(
224:                            "Component of QName must be URI, Local Name, or Prefix");
225:                }
226:            }
227:
228:            /**
229:             * Convert to target data type
230:             * @param requiredType an integer identifying the required atomic type
231:             * @param context
232:             * @return an AtomicValue, a value of the required type; or an ErrorValue
233:             */
234:
235:            public AtomicValue convertPrimitive(BuiltInAtomicType requiredType,
236:                    boolean validate, XPathContext context) {
237:                switch (requiredType.getPrimitiveType()) {
238:                case Type.ANY_ATOMIC:
239:                case Type.ITEM:
240:                case Type.QNAME:
241:                    return this ;
242:                case Type.STRING:
243:                    return new StringValue(getStringValue());
244:                case Type.UNTYPED_ATOMIC:
245:                    return new UntypedAtomicValue(getStringValue());
246:                default:
247:                    ValidationException err = new ValidationException(
248:                            "Cannot convert QName to "
249:                                    + requiredType.getDisplayName());
250:                    err.setErrorCode("XPTY0004");
251:                    err.setIsTypeError(true);
252:                    return new ValidationErrorValue(err);
253:                }
254:            }
255:
256:            /**
257:             * Return the type of the expression
258:             * @return Type.QNAME (always)
259:             * @param th
260:             */
261:
262:            public ItemType getItemType(TypeHierarchy th) {
263:                return Type.QNAME_TYPE;
264:            }
265:
266:            /**
267:             * Determine if two QName values are equal. This comparison ignores the prefix part
268:             * of the value.
269:             * @throws ClassCastException if they are not comparable
270:             * @throws IllegalStateException if the two QNames are in different name pools
271:             */
272:
273:            public boolean equals(Object other) {
274:                QNameValue val = (QNameValue) other;
275:                return localPart.equals(val.localPart) && uri.equals(val.uri);
276:            }
277:
278:            public int hashCode() {
279:                return localPart.hashCode() ^ uri.hashCode();
280:            }
281:
282:            /**
283:             * Convert to Java object (for passing to external functions)
284:             */
285:
286:            public Object convertToJava(Class target, XPathContext context)
287:                    throws XPathException {
288:                if (target.isAssignableFrom(QNameValue.class)) {
289:                    return this ;
290:                } else if (target.getClass().getName().equals(
291:                        "javax.xml.namespace.QName")) {
292:                    // TODO: rewrite this under JDK 1.5
293:                    return makeQName(context.getConfiguration());
294:                } else {
295:                    Object o = super .convertToJava(target, context);
296:                    if (o == null) {
297:                        throw new DynamicError("Conversion of QName to "
298:                                + target.getName() + " is not supported");
299:                    }
300:                    return o;
301:                }
302:            }
303:
304:            /**
305:             * The toString() method returns the name in the form QName("uri", "local")
306:             * @return the name in in the form QName("uri", "local")
307:             */
308:
309:            public String toString() {
310:                return "QName(\"" + uri + "\", \"" + localPart + "\")";
311:            }
312:
313:            /**
314:             * Temporary method to construct a javax.xml.namespace.QName without actually mentioning it
315:             * by name
316:             */
317:
318:            public Object makeQName(Configuration config) {
319:                try {
320:                    Class qnameClass = config.getClass(
321:                            "javax.xml.namespace.QName", false, null);
322:                    Class[] argTypes = { String.class, String.class,
323:                            String.class };
324:                    Constructor constructor = qnameClass
325:                            .getConstructor(argTypes);
326:                    String[] argValues = { uri, localPart, prefix };
327:                    Object result = constructor.newInstance(argValues);
328:                    return result;
329:                } catch (XPathException e) {
330:                    return null;
331:                } catch (NoSuchMethodException e) {
332:                    return null;
333:                } catch (InstantiationException e) {
334:                    return null;
335:                } catch (IllegalAccessException e) {
336:                    return null;
337:                } catch (InvocationTargetException e) {
338:                    return null;
339:                }
340:
341:            }
342:
343:            //    public static void main(String[] args) throws Exception {
344:            //        QName q = (QName)new QNameValue("a", "b", "c").makeQName();
345:            //        QNameValue v = Value.makeQNameValue(q);
346:            //        System.err.println(q);
347:            //        System.err.println(v);
348:            //    }
349:
350:        }
351:
352:        //
353:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
354:        // you may not use this file except in compliance with the License. You may obtain a copy of the
355:        // License at http://www.mozilla.org/MPL/
356:        //
357:        // Software distributed under the License is distributed on an "AS IS" basis,
358:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
359:        // See the License for the specific language governing rights and limitations under the License.
360:        //
361:        // The Original Code is: all this file.
362:        //
363:        // The Initial Developer of the Original Code is Michael H. Kay
364:        //
365:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
366:        //
367:        // Contributor(s): none.
368:        //
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