Source Code Cross Referenced for SequenceWriter.java in  » XML » XPath-Saxon » net » sf » saxon » event » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » XPath Saxon » net.sf.saxon.event 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sf.saxon.event;
002:
003:        import net.sf.saxon.trans.XPathException;
004:        import net.sf.saxon.tinytree.TinyBuilder;
005:        import net.sf.saxon.om.*;
006:        import net.sf.saxon.type.Type;
007:        import net.sf.saxon.value.AtomicValue;
008:
009:        /**
010:         * This outputter is used when writing a sequence of atomic values and nodes, for
011:         * example, when xsl:variable is used with content and an "as" attribute. The outputter
012:         * builds the sequence; the concrete subclass is responsible for deciding what to do with the
013:         * resulting items.
014:         *
015:         * <p>This class is not used to build temporary trees. For that, the ComplexContentOutputter
016:         * is used.</p>
017:         *
018:         *
019:         * @author Michael H. Kay
020:         */
021:
022:        public abstract class SequenceWriter extends SequenceReceiver {
023:            private String systemId;
024:            private Receiver tree = null;
025:            private TinyBuilder builder = null;
026:            private int level = 0;
027:            private boolean inStartTag = false;
028:            private static final int[] treeSizeParameters = { 50, 10, 5, 200 };
029:
030:            /**
031:             * Abstract method to be supplied by subclasses: output one item in the sequence.
032:             */
033:
034:            public abstract void write(Item item) throws XPathException;
035:
036:            /**
037:             * Set the system ID
038:             * @param systemId the URI used to identify the tree being passed across this interface
039:             */
040:
041:            public void setSystemId(String systemId) {
042:                this .systemId = systemId;
043:            }
044:
045:            /**
046:             * Get the system ID
047:             * @return the system ID that was supplied using the setSystemId() method
048:             */
049:
050:            public String getSystemId() {
051:                return systemId;
052:            }
053:
054:            /**
055:             * Determine whether there are any open document or element nodes in the output
056:             */
057:
058:            public boolean hasOpenNodes() {
059:                return level != 0;
060:            }
061:
062:            /**
063:             * Start of a document node.
064:             */
065:
066:            public void startDocument(int properties) throws XPathException {
067:                if (tree == null) {
068:                    createTree();
069:                }
070:                if (level++ == 0) {
071:                    tree.startDocument(properties);
072:                }
073:            }
074:
075:            /**
076:             * Create a TinyTree to hold a document or element node.
077:             * @throws net.sf.saxon.trans.XPathException
078:             */
079:
080:            private void createTree() throws XPathException {
081:                builder = new TinyBuilder();
082:                builder.setPipelineConfiguration(getPipelineConfiguration());
083:                builder.setSizeParameters(treeSizeParameters);
084:
085:                NamespaceReducer reducer = new NamespaceReducer();
086:                reducer.setUnderlyingReceiver(builder);
087:                reducer.setPipelineConfiguration(getPipelineConfiguration());
088:
089:                ComplexContentOutputter complex = new ComplexContentOutputter();
090:                complex.setPipelineConfiguration(getPipelineConfiguration());
091:                complex.setReceiver(reducer);
092:                tree = complex;
093:
094:                tree.setSystemId(systemId);
095:                tree.setPipelineConfiguration(getPipelineConfiguration());
096:                tree.open();
097:            }
098:
099:            /**
100:             * Notify the end of a document node
101:             */
102:
103:            public void endDocument() throws XPathException {
104:                if (--level == 0) {
105:                    tree.endDocument();
106:                    DocumentInfo doc = (DocumentInfo) builder.getCurrentRoot();
107:                    // add the constructed document to the result sequence
108:                    append(doc, 0, NodeInfo.ALL_NAMESPACES);
109:                }
110:                previousAtomic = false;
111:            }
112:
113:            /**
114:             * Output an element start tag.
115:             * @param nameCode The element name code - a code held in the Name Pool
116:             * @param typeCode Integer code identifying the type of this element. Zero identifies the default
117:             * type, that is xs:anyType
118:             * @param properties bit-significant flags indicating any special information
119:             */
120:
121:            public void startElement(int nameCode, int typeCode,
122:                    int locationId, int properties) throws XPathException {
123:
124:                if (inStartTag) {
125:                    startContent();
126:                }
127:
128:                if (tree == null) {
129:                    createTree();
130:                }
131:
132:                tree.startElement(nameCode, typeCode, locationId, properties);
133:                level++;
134:                inStartTag = true;
135:                previousAtomic = false;
136:            }
137:
138:            /**
139:             * Output an element end tag.
140:             */
141:
142:            public void endElement() throws XPathException {
143:                if (inStartTag) {
144:                    startContent();
145:                }
146:                tree.endElement();
147:                if (--level == 0) {
148:                    NodeInfo element = builder.getCurrentRoot();
149:                    append(element, 0, NodeInfo.ALL_NAMESPACES);
150:                }
151:                previousAtomic = false;
152:            }
153:
154:            /**
155:             * Output a namespace declaration. <br>
156:             * This is added to a list of pending namespaces for the current start tag.
157:             * If there is already another declaration of the same prefix, this one is
158:             * ignored.
159:             * Note that unlike SAX2 startPrefixMapping(), this call is made AFTER writing the start tag.
160:             * @param nscode The namespace code
161:             * @param properties Allows special properties to be passed if required
162:             * @throws net.sf.saxon.trans.XPathException if there is no start tag to write to (created using writeStartTag),
163:             * or if character content has been written since the start tag was written.
164:             */
165:
166:            public void namespace(int nscode, int properties)
167:                    throws XPathException {
168:                if (level == 0) {
169:                    NamePool namePool = getNamePool();
170:                    Orphan o = new Orphan(getConfiguration());
171:                    o.setNodeKind(Type.NAMESPACE);
172:                    o.setNameCode(namePool.allocate("", "", namePool
173:                            .getPrefixFromNamespaceCode(nscode)));
174:                    o.setStringValue(namePool.getURIFromNamespaceCode(nscode));
175:                    append(o, 0, NodeInfo.ALL_NAMESPACES);
176:                } else {
177:                    tree.namespace(nscode, properties);
178:                }
179:                previousAtomic = false;
180:            }
181:
182:            /**
183:             * Output an attribute value. <br>
184:             * @param nameCode An integer code representing the name of the attribute, as held in the Name Pool
185:             * @param typeCode Integer code identifying the type annotation of the attribute; zero represents
186:             * the default type (xs:untypedAtomic)
187:             * @param value The value of the attribute
188:             * @param properties Bit significant flags for passing extra information to the serializer, e.g.
189:             * to disable escaping
190:             * @throws net.sf.saxon.trans.XPathException if there is no start tag to write to (created using writeStartTag),
191:             * or if character content has been written since the start tag was written.
192:             */
193:
194:            public void attribute(int nameCode, int typeCode,
195:                    CharSequence value, int locationId, int properties)
196:                    throws XPathException {
197:                if (level == 0) {
198:                    Orphan o = new Orphan(getConfiguration());
199:                    o.setNodeKind(Type.ATTRIBUTE);
200:                    o.setNameCode(nameCode);
201:                    o.setStringValue(value);
202:                    o.setTypeAnnotation(typeCode);
203:                    append(o, locationId, NodeInfo.ALL_NAMESPACES);
204:                } else {
205:                    tree.attribute(nameCode, typeCode, value, locationId,
206:                            properties);
207:                }
208:                previousAtomic = false;
209:            }
210:
211:            /**
212:             * The startContent() event is notified after all namespaces and attributes of an element
213:             * have been notified, and before any child nodes are notified.
214:             * @throws net.sf.saxon.trans.XPathException for any failure
215:             */
216:
217:            public void startContent() throws XPathException {
218:                inStartTag = false;
219:                tree.startContent();
220:                previousAtomic = false;
221:            }
222:
223:            /**
224:             * Produce text content output. <BR>
225:             * @param s The String to be output
226:             * @param properties bit-significant flags for extra information, e.g. disable-output-escaping
227:             * @throws net.sf.saxon.trans.XPathException for any failure
228:             */
229:
230:            public void characters(CharSequence s, int locationId,
231:                    int properties) throws XPathException {
232:                if (level == 0) {
233:                    Orphan o = new Orphan(getConfiguration());
234:                    o.setNodeKind(Type.TEXT);
235:                    o.setStringValue(s);
236:                    append(o, locationId, NodeInfo.ALL_NAMESPACES);
237:                } else {
238:                    if (s.length() > 0) {
239:                        if (inStartTag) {
240:                            startContent();
241:                        }
242:                        tree.characters(s, locationId, properties);
243:                    }
244:                }
245:                previousAtomic = false;
246:            }
247:
248:            /**
249:             * Write a comment.
250:             */
251:
252:            public void comment(CharSequence comment, int locationId,
253:                    int properties) throws XPathException {
254:                if (inStartTag) {
255:                    startContent();
256:                }
257:                if (level == 0) {
258:                    Orphan o = new Orphan(getConfiguration());
259:                    o.setNodeKind(Type.COMMENT);
260:                    o.setStringValue(comment);
261:                    append(o, locationId, NodeInfo.ALL_NAMESPACES);
262:                } else {
263:                    tree.comment(comment, locationId, properties);
264:                }
265:                previousAtomic = false;
266:            }
267:
268:            /**
269:             * Write a processing instruction
270:             * No-op in this implementation
271:             */
272:
273:            public void processingInstruction(String target, CharSequence data,
274:                    int locationId, int properties) throws XPathException {
275:                if (inStartTag) {
276:                    startContent();
277:                }
278:                if (level == 0) {
279:                    Orphan o = new Orphan(getConfiguration());
280:                    o.setNameCode(getNamePool().allocate("", "", target));
281:                    o.setNodeKind(Type.PROCESSING_INSTRUCTION);
282:                    o.setStringValue(data);
283:                    append(o, locationId, NodeInfo.ALL_NAMESPACES);
284:                } else {
285:                    tree.processingInstruction(target, data, locationId,
286:                            properties);
287:                }
288:                previousAtomic = false;
289:            }
290:
291:            /**
292:             * Close the output
293:             */
294:
295:            public void close() throws XPathException {
296:                previousAtomic = false;
297:                if (tree != null) {
298:                    tree.close();
299:                }
300:            }
301:
302:            /**
303:             * Append an item to the sequence, performing any necessary type-checking and conversion
304:             */
305:
306:            public void append(Item item, int locationId, int copyNamespaces)
307:                    throws XPathException {
308:
309:                if (item == null) {
310:                    return;
311:                }
312:
313:                if (level == 0) {
314:                    write(item);
315:                    previousAtomic = false;
316:                } else {
317:                    if (item instanceof  AtomicValue) {
318:                        // If an atomic value is written to a tree, and the previous item was also
319:                        // an atomic value, then add a single space to separate them
320:                        if (previousAtomic) {
321:                            tree.characters(" ", 0, 0);
322:                        }
323:                        tree.characters(item.getStringValueCS(), 0, 0);
324:                        previousAtomic = true;
325:                    } else {
326:                        ((NodeInfo) item).copy(tree, NodeInfo.ALL_NAMESPACES,
327:                                true, locationId);
328:                        previousAtomic = false;
329:                    }
330:                }
331:            }
332:        }
333:
334:        //
335:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
336:        // you may not use this file except in compliance with the License. You may obtain a copy of the
337:        // License at http://www.mozilla.org/MPL/
338:        //
339:        // Software distributed under the License is distributed on an "AS IS" basis,
340:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
341:        // See the License for the specific language governing rights and limitations under the License.
342:        //
343:        // The Original Code is: all this file.
344:        //
345:        // The Initial Developer of the Original Code is Michael H. Kay
346:        //
347:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
348:        //
349:        // Contributor(s): none.
350:        //
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