/*
* @(#)$Id: codetemplate_xbird.xml 3792 2008-04-21 21:39:23Z yui $
*
* Copyright 2006-2008 Makoto YUI
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Contributors:
* Makoto YUI - initial implementation
*/
package example;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.io.Writer;
import java.net.URI;
import java.net.URL;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import xbird.util.io.NoopWriter;
import xbird.util.net.NetUtils;
import xbird.util.xml.SAXWriter;
import xbird.xquery.XQueryException;
import xbird.xquery.XQueryModule;
import xbird.xquery.XQueryProcessor;
import xbird.xquery.dm.XQEventReceiver;
import xbird.xquery.dm.ser.SAXSerializer;
import xbird.xquery.dm.ser.Serializer;
import xbird.xquery.dm.ser.StAXSerializer;
import xbird.xquery.dm.value.Item;
import xbird.xquery.dm.value.Sequence;
import xbird.xquery.meta.IFocus;
import xbird.xquery.misc.TypeUtil;
import xbird.xquery.type.Type;
import xbird.xquery.type.node.NodeType;
/**
*
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
*/
public class Example1 {
public Example1() {}
public static void main(String[] args) {
try {
new Example1().doMain(args);
} catch (Exception e) {
throw new Error(e);
}
}
private void doMain(String[] args) throws IOException, XQueryException, XMLStreamException {
URL queryFileUrl = Example1.class.getResource("bib_relative.xq");
InputStream input1 = queryFileUrl.openStream();
URI baseUri = NetUtils.toURI(queryFileUrl); // This baseUri effects to fn:doc(...)
invokeQueryPullMode(input1, baseUri);
input1.close();
System.out.println("--------------------------------");
InputStream input2 = Example1.class.getResourceAsStream("bib_absolute.xq");
invokeQueryPushMode(input2, null);
}
private static void invokeQueryPullMode(InputStream input, URI baseUri) throws XQueryException {
XQueryProcessor proc = new XQueryProcessor();
// #1 parse a query
XQueryModule module = proc.parse(input, baseUri);
// #2 execute the compiled expression using ``pull'' mode
Sequence<? extends Item> result = proc.execute(module);
// prepare SAX result handler
Writer writer = new NoopWriter();
SAXWriter saxHandler = new SAXWriter(writer, "UTF-8"); // SAXWriter implements ContentHandler
saxHandler.setPrettyPrint(true); // enabled formatting
saxHandler.setXMLDeclaration(true); // insert XML declaration to output
Serializer ser = new SAXSerializer(saxHandler);
ser.emit(result); // emit SAX events to SAX handler
for(Item item : result) {// Note that every Sequence instances implement Iterable.
// get string value
String stringValue = item.stringValue();
// get type
Type itemType = item.getType();
if(TypeUtil.subtypeOf(itemType, NodeType.ELEMENT)) {
// the Item is element
} else if(TypeUtil.instanceOf(item, NodeType.TEXT)) {
// another variant
}
// print string value
System.out.println(item); // item.toString() invokes item.stringValue()
// Item is subclass of Sequence, thus it can also be converted to SAX events.
ser.emit(item);
}
// The above 'for each' is equivalent to the following expression.
IFocus focus = result.iterator(); // IFocus extends Iterable
while(result.next(focus)) {
Item item = focus.getContextItem();
// ..
}
}
private static void invokeQueryPushMode(InputStream input, URI baseUri) throws XQueryException,
XMLStreamException {
XQueryProcessor proc = new XQueryProcessor();
// #1 parse a query
XQueryModule module = proc.parse(input);
// prepare a result handler (StAX)
Writer writer = new StringWriter();
XMLOutputFactory factory = XMLOutputFactory.newInstance();
XMLStreamWriter streamWriter = factory.createXMLStreamWriter(writer);
XQEventReceiver handler = new StAXSerializer(streamWriter);
// #2 execute the compiled expression using ``push'' mode
// In push mode, the result is directed to the events.
proc.execute(module, handler);
streamWriter.flush(); // flushing is required
System.out.println(writer.toString());
}
}