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

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


001:        package net.sf.saxon.query;
002:
003:        import net.sf.saxon.event.Receiver;
004:        import net.sf.saxon.event.SequenceReceiver;
005:        import net.sf.saxon.om.Item;
006:        import net.sf.saxon.om.NamePool;
007:        import net.sf.saxon.om.NamespaceConstant;
008:        import net.sf.saxon.om.NodeInfo;
009:        import net.sf.saxon.trans.XPathException;
010:        import net.sf.saxon.type.AtomicType;
011:        import net.sf.saxon.value.AtomicValue;
012:        import net.sf.saxon.style.StandardNames;
013:
014:        /**
015:         * This class can be used in a push pipeline: it accepts any sequence as input, and generates
016:         * a document in which the items of the sequence are wrapped by elements containing information about
017:         * the types of the items in the input sequence.
018:         */
019:
020:        public class SequenceWrapper extends SequenceReceiver {
021:
022:            public static final String RESULT_NS = QueryResult.RESULT_NS;
023:
024:            private Receiver out;
025:            private int depth = 0;
026:
027:            private int resultSequence;
028:            private int resultDocument;
029:            private int resultElement;
030:            private int resultAttribute;
031:            private int resultText;
032:            private int resultComment;
033:            private int resultPI;
034:            private int resultNamespace;
035:            private int resultAtomicValue;
036:            private int xsiType;
037:
038:            public SequenceWrapper(Receiver destination) {
039:                this .out = destination;
040:                setPipelineConfiguration(destination.getPipelineConfiguration());
041:            }
042:
043:            public void open() throws XPathException {
044:
045:                NamePool pool = getNamePool();
046:
047:                resultSequence = pool.allocate("result", RESULT_NS, "sequence");
048:                resultDocument = pool.allocate("result", RESULT_NS, "document");
049:                resultElement = pool.allocate("result", RESULT_NS, "element");
050:                resultAttribute = pool.allocate("result", RESULT_NS,
051:                        "attribute");
052:                resultText = pool.allocate("result", RESULT_NS, "text");
053:                resultComment = pool.allocate("result", RESULT_NS, "comment");
054:                resultPI = pool.allocate("result", RESULT_NS,
055:                        "processing-instruction");
056:                resultNamespace = pool.allocate("result", RESULT_NS,
057:                        "namespace");
058:                resultAtomicValue = pool.allocate("result", RESULT_NS,
059:                        "atomic-value");
060:                xsiType = pool.allocate("xsi",
061:                        NamespaceConstant.SCHEMA_INSTANCE, "type");
062:
063:                out.open();
064:                out.startDocument(0);
065:
066:                out.startElement(resultSequence, StandardNames.XDT_UNTYPED, 0,
067:                        0);
068:                out.namespace(pool.allocateNamespaceCode("result", RESULT_NS),
069:                        0);
070:                out.namespace(pool.allocateNamespaceCode("xs",
071:                        NamespaceConstant.SCHEMA), 0);
072:                out.namespace(pool.allocateNamespaceCode("xsi",
073:                        NamespaceConstant.SCHEMA_INSTANCE), 0);
074:                out.startContent();
075:
076:            }
077:
078:            /**
079:             * Start of a document node.
080:             */
081:
082:            public void startDocument(int properties) throws XPathException {
083:                out.startElement(resultDocument, StandardNames.XDT_UNTYPED, 0,
084:                        0);
085:                out.startContent();
086:                depth++;
087:            }
088:
089:            /**
090:             * Notify the end of a document node
091:             */
092:
093:            public void endDocument() throws XPathException {
094:                out.endElement();
095:                depth--;
096:            }
097:
098:            /**
099:             * Notify the start of an element
100:             *
101:             * @param nameCode   integer code identifying the name of the element within the name pool.
102:             * @param typeCode   integer code identifying the element's type within the name pool.
103:             * @param properties properties of the element node
104:             */
105:
106:            public void startElement(int nameCode, int typeCode,
107:                    int locationId, int properties) throws XPathException {
108:                if (depth++ == 0) {
109:                    out.startElement(resultElement, StandardNames.XDT_UNTYPED,
110:                            0, 0);
111:                    out.startContent();
112:                }
113:                out.startElement(nameCode, typeCode, locationId, properties);
114:            }
115:
116:            /**
117:             * End of element
118:             */
119:
120:            public void endElement() throws XPathException {
121:                out.endElement();
122:                if (--depth == 0) {
123:                    out.endElement(); // close the wrapping element
124:                }
125:            }
126:
127:            /**
128:             * Notify an attribute. Attributes are notified after the startElement event, and before any
129:             * children. Namespaces and attributes may be intermingled.
130:             *
131:             * @param nameCode   The name of the attribute, as held in the name pool
132:             * @param typeCode   The type of the attribute, as held in the name pool
133:             * @param properties Bit significant value. The following bits are defined:
134:             *                   <dd>DISABLE_ESCAPING</dd>    <dt>Disable escaping for this attribute</dt>
135:             *                   <dd>NO_SPECIAL_CHARACTERS</dd>      <dt>Attribute value contains no special characters</dt>
136:             * @throws IllegalStateException: attempt to output an attribute when there is no open element
137:             *                                start tag
138:             */
139:
140:            public void attribute(int nameCode, int typeCode,
141:                    CharSequence value, int locationId, int properties)
142:                    throws XPathException {
143:                if (depth == 0) {
144:                    out.startElement(resultAttribute,
145:                            StandardNames.XDT_UNTYPED, 0, 0);
146:                    out.attribute(nameCode, typeCode, value, locationId,
147:                            properties);
148:                    out.startContent();
149:                    out.endElement();
150:                } else {
151:                    out.attribute(nameCode, typeCode, value, locationId,
152:                            properties);
153:                }
154:            }
155:
156:            /**
157:             * Notify a namespace. Namespaces are notified <b>after</b> the startElement event, and before
158:             * any children for the element. The namespaces that are reported are only required
159:             * to include those that are different from the parent element; however, duplicates may be reported.
160:             * A namespace must not conflict with any namespaces already used for element or attribute names.
161:             *
162:             * @param namespaceCode an integer: the top half is a prefix code, the bottom half a URI code.
163:             *                      These may be translated into an actual prefix and URI using the name pool. A prefix code of
164:             *                      zero represents the empty prefix (that is, the default namespace). A URI code of zero represents
165:             *                      a URI of "", that is, a namespace undeclaration.
166:             * @throws IllegalStateException: attempt to output a namespace when there is no open element
167:             *                                start tag
168:             */
169:
170:            public void namespace(int namespaceCode, int properties)
171:                    throws XPathException {
172:                if (depth == 0) {
173:                    out.startElement(resultNamespace,
174:                            StandardNames.XDT_UNTYPED, 0, 0);
175:                    out.namespace(namespaceCode, properties);
176:                    out.startContent();
177:                    out.endElement();
178:                } else {
179:                    out.namespace(namespaceCode, properties);
180:                }
181:            }
182:
183:            /**
184:             * Character data
185:             */
186:
187:            public void characters(CharSequence chars, int locationId,
188:                    int properties) throws XPathException {
189:                if (depth == 0) {
190:                    out.startElement(resultText, StandardNames.XDT_UNTYPED, 0,
191:                            0);
192:                    out.startContent();
193:                    out.characters(chars, locationId, properties);
194:                    out.endElement();
195:                } else {
196:                    out.characters(chars, locationId, properties);
197:                }
198:            }
199:
200:            /**
201:             * Output a comment
202:             */
203:
204:            public void comment(CharSequence chars, int locationId,
205:                    int properties) throws XPathException {
206:                if (depth == 0) {
207:                    out.startElement(resultComment, StandardNames.XDT_UNTYPED,
208:                            0, 0);
209:                    out.startContent();
210:                    out.comment(chars, locationId, properties);
211:                    out.endElement();
212:                } else {
213:                    out.comment(chars, locationId, properties);
214:                }
215:            }
216:
217:            /**
218:             * Processing Instruction
219:             */
220:
221:            public void processingInstruction(String target, CharSequence data,
222:                    int locationId, int properties) throws XPathException {
223:                if (depth == 0) {
224:                    out.startElement(resultPI, StandardNames.XDT_UNTYPED, 0, 0);
225:                    out.startContent();
226:                    out.processingInstruction(target, data, locationId,
227:                            properties);
228:                    out.endElement();
229:                } else {
230:                    out.processingInstruction(target, data, locationId,
231:                            properties);
232:                }
233:            }
234:
235:            /**
236:             * Output an item (atomic value or node) to the sequence
237:             */
238:
239:            public void append(Item item, int locationId, int copyNamespaces)
240:                    throws XPathException {
241:                if (item instanceof  AtomicValue) {
242:                    final NamePool pool = getNamePool();
243:                    out.startElement(resultAtomicValue,
244:                            StandardNames.XDT_UNTYPED, 0, 0);
245:                    AtomicType type = (AtomicType) ((AtomicValue) item)
246:                            .getItemType(pool.getTypeHierarchy());
247:                    int nameCode = type.getNameCode();
248:                    String prefix = pool.getPrefix(nameCode);
249:                    String localName = pool.getLocalName(nameCode);
250:                    String uri = pool.getURI(nameCode);
251:                    if (prefix.equals("")) {
252:                        prefix = pool.suggestPrefixForURI(uri);
253:                        if (prefix == null) {
254:                            prefix = "p" + uri.hashCode();
255:                        }
256:                    }
257:                    int nscode = pool.allocateNamespaceCode(prefix, uri);
258:                    String displayName = prefix + ':' + localName;
259:                    out.namespace(nscode, 0);
260:                    out.attribute(xsiType, StandardNames.XDT_UNTYPED_ATOMIC,
261:                            displayName, 0, 0);
262:                    out.startContent();
263:                    out.characters(item.getStringValue(), 0, 0);
264:                    out.endElement();
265:                } else {
266:                    ((NodeInfo) item).copy(this , NodeInfo.ALL_NAMESPACES, true,
267:                            locationId);
268:                }
269:            }
270:
271:            /**
272:             * Notify the start of the content, that is, the completion of all attributes and namespaces.
273:             * Note that the initial receiver of output from XSLT instructions will not receive this event,
274:             * it has to detect it itself. Note that this event is reported for every element even if it has
275:             * no attributes, no namespaces, and no content.
276:             */
277:
278:            public void startContent() throws XPathException {
279:                out.startContent();
280:            }
281:
282:            /**
283:             * Notify the end of the event stream
284:             */
285:
286:            public void close() throws XPathException {
287:                out.endElement(); // close the result:sequence element
288:                out.endDocument();
289:                out.close();
290:            }
291:
292:        }
293:
294:        //
295:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
296:        // you may not use this file except in compliance with the License. You may obtain a copy of the
297:        // License at http://www.mozilla.org/MPL/
298:        //
299:        // Software distributed under the License is distributed on an "AS IS" basis,
300:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
301:        // See the License for the specific language governing rights and limitations under the License.
302:        //
303:        // The Original Code is: all this file.
304:        //
305:        // The Initial Developer of the Original Code is Michael H. Kay.
306:        //
307:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
308:        //
309:        // Contributor(s): none.
310:        //
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