Source Code Cross Referenced for QueryResult.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.Configuration;
004:        import net.sf.saxon.event.*;
005:        import net.sf.saxon.om.DocumentInfo;
006:        import net.sf.saxon.om.Item;
007:        import net.sf.saxon.om.NodeInfo;
008:        import net.sf.saxon.om.SequenceIterator;
009:        import net.sf.saxon.tinytree.TinyBuilder;
010:        import net.sf.saxon.trans.DynamicError;
011:        import net.sf.saxon.trans.XPathException;
012:        import net.sf.saxon.type.Type;
013:        import net.sf.saxon.value.QNameValue;
014:
015:        import javax.xml.transform.OutputKeys;
016:        import javax.xml.transform.Result;
017:        import javax.xml.transform.stream.StreamResult;
018:        import java.io.OutputStream;
019:        import java.io.OutputStreamWriter;
020:        import java.io.PrintWriter;
021:        import java.io.UnsupportedEncodingException;
022:        import java.util.Properties;
023:
024:        /**
025:         * This utility class takes the result sequence produced by a query, and wraps it as
026:         * an XML document. The class is never instantiated.
027:         */
028:        public class QueryResult {
029:
030:            public static String RESULT_NS = "http://saxon.sf.net/xquery-results";
031:
032:            private QueryResult() {
033:            }
034:
035:            /**
036:             * Take the results of a query (or any other SequenceIterator) and create
037:             * an XML document containing copies of all items in the sequence, suitably wrapped
038:             * @param iterator  The values to be wrapped
039:             * @param config The Saxon configuration used to evaluate the query
040:             * @return the document containing the wrapped results
041:             * @throws XPathException
042:             */
043:
044:            public static DocumentInfo wrap(SequenceIterator iterator,
045:                    Configuration config) throws XPathException {
046:                PipelineConfiguration pipe = config.makePipelineConfiguration();
047:                TinyBuilder builder = new TinyBuilder();
048:
049:                NamespaceReducer reducer = new NamespaceReducer();
050:                reducer.setUnderlyingReceiver(builder);
051:                Receiver tree = reducer;
052:
053:                tree.setPipelineConfiguration(pipe);
054:                builder.setPipelineConfiguration(pipe);
055:                sendWrappedSequence(iterator, tree);
056:                return (DocumentInfo) builder.getCurrentRoot();
057:            }
058:
059:            /**
060:             * Take a sequence supplied in the form of an iterator and generate a wrapped represention of the
061:             * items in the sequence, the wrapped representation being a sequence of events sent to a supplied
062:             * Receiver.
063:             * @param iterator the input sequence
064:             * @param destination the Receiver to accept the wrapped output
065:             */
066:
067:            public static void sendWrappedSequence(SequenceIterator iterator,
068:                    Receiver destination) throws XPathException {
069:                SequenceCopier.copySequence(iterator, new SequenceWrapper(
070:                        destination));
071:            }
072:
073:            /**
074:             * Serialize a document containing wrapped query results (or any other document, in fact)
075:             * as XML.
076:             * @param node                      The document or element to be serialized
077:             * @param destination               The Result object to contain the serialized form
078:             * @param outputProperties          Serialization options
079:             * @param config                    The Configuration
080:             * @throws XPathException     If serialization fails
081:             */
082:
083:            public static void serialize(NodeInfo node, Result destination,
084:                    Properties outputProperties, Configuration config)
085:                    throws XPathException {
086:                PipelineConfiguration pipe = config.makePipelineConfiguration();
087:                int type = node.getNodeKind();
088:                if (type == Type.DOCUMENT || type == Type.ELEMENT) {
089:                    DocumentSender sender = new DocumentSender(node);
090:                    Receiver receiver = ResultWrapper.getReceiver(destination,
091:                            pipe, outputProperties);
092:                    NamespaceReducer reducer = new NamespaceReducer();
093:                    reducer.setUnderlyingReceiver(receiver);
094:                    reducer.setPipelineConfiguration(pipe);
095:                    sender.send(reducer);
096:                } else {
097:                    throw new DynamicError(
098:                            "Node to be serialized must be a Document or Element node");
099:                }
100:            }
101:
102:            /**
103:             * Serialize an arbitrary sequence, without any special wrapping.
104:             * @param results the sequence to be serialized
105:             * @param config the configuration (gives access to information such as the NamePool)
106:             * @param destination the output stream to which the output is to be written
107:             * @param outputProps a set of serialization properties as defined in JAXP
108:             * @throws XPathException if any failure occurs
109:             */
110:
111:            public static void serializeSequence(SequenceIterator results,
112:                    Configuration config, OutputStream destination,
113:                    Properties outputProps) throws XPathException {
114:                String encoding = outputProps.getProperty(OutputKeys.ENCODING);
115:                if (encoding == null) {
116:                    encoding = "UTF-8";
117:                }
118:                PrintWriter writer;
119:                try {
120:                    writer = new PrintWriter(new OutputStreamWriter(
121:                            destination, encoding));
122:                } catch (UnsupportedEncodingException err) {
123:                    throw new DynamicError(err);
124:                }
125:                while (true) {
126:                    Item item = results.next();
127:                    if (item == null)
128:                        break;
129:                    if (item instanceof  NodeInfo) {
130:                        switch (((NodeInfo) item).getNodeKind()) {
131:                        case Type.DOCUMENT:
132:                        case Type.ELEMENT:
133:                            serialize((NodeInfo) item,
134:                                    new StreamResult(writer), outputProps,
135:                                    config);
136:                            writer.println("");
137:                            break;
138:                        case Type.ATTRIBUTE:
139:                            writer.println(((NodeInfo) item).getLocalPart()
140:                                    + "=\"" + item.getStringValue() + '\"');
141:                            break;
142:                        case Type.COMMENT:
143:                            writer.println("<!--" + item.getStringValue()
144:                                    + "-->");
145:                            break;
146:                        case Type.PROCESSING_INSTRUCTION:
147:                            writer.println("<?"
148:                                    + ((NodeInfo) item).getLocalPart() + ' '
149:                                    + item.getStringValue() + "?>");
150:                            break;
151:                        default:
152:                            writer.println(item.getStringValue());
153:                        }
154:                    } else if (item instanceof  QNameValue) {
155:                        writer.println(((QNameValue) item).getClarkName());
156:                    } else {
157:                        writer.println(item.getStringValue());
158:                    }
159:                }
160:                writer.flush();
161:            }
162:
163:            //    public static void main(String[] params) throws Exception {
164:            //        StaticQueryContext env = new StaticQueryContext(new Configuration());
165:            //        QueryProcessor qp = new QueryProcessor(env);
166:            //        XQueryExpression exp = qp.compileQuery("<a><b/></a>");
167:            //        SequenceIterator iter = exp.iterator(new DynamicQueryContext());
168:            //        NodeInfo node = (NodeInfo)iter.next();
169:            //        serialize(node, new SAXResult(new ExampleContentHandler()), new Properties());
170:            //
171:            //    }
172:        }
173:
174:        //
175:        // The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
176:        // you may not use this file except in compliance with the License. You may obtain a copy of the
177:        // License at http://www.mozilla.org/MPL/
178:        //
179:        // Software distributed under the License is distributed on an "AS IS" basis,
180:        // WITHOUT WARRANTY OF ANY KIND, either express or implied.
181:        // See the License for the specific language governing rights and limitations under the License.
182:        //
183:        // The Original Code is: all this file.
184:        //
185:        // The Initial Developer of the Original Code is Michael H. Kay
186:        //
187:        // Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
188:        //
189:        // Contributor(s): none.
190:        //
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