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package net.sourceforge.segment.srx.io;
import static net.rootnode.loomchild.util.io.Util.getReader;
import static net.rootnode.loomchild.util.io.Util.getResourceStream;
import static net.rootnode.loomchild.util.xml.Util.getContext;
import static net.rootnode.loomchild.util.xml.Util.getSchema;
import static net.rootnode.loomchild.util.xml.Util.getSource;
import static net.rootnode.loomchild.util.xml.Util.validate;
import java.io.Reader;
import java.util.HashMap;
import java.util.Map;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.events.Attribute;
import javax.xml.stream.events.Characters;
import javax.xml.stream.events.EndElement;
import javax.xml.stream.events.StartElement;
import javax.xml.stream.events.XMLEvent;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import net.rootnode.loomchild.util.exceptions.XmlException;
import net.rootnode.loomchild.util.xml.Bind;
import net.sourceforge.segment.srx.LanguageRule;
import net.sourceforge.segment.srx.Rule;
import net.sourceforge.segment.srx.SrxDocument;
import net.sourceforge.segment.srx.SrxParser;
import net.sourceforge.segment.srx.io.bind.Beforebreak;
import net.sourceforge.segment.srx.io.bind.Body;
import net.sourceforge.segment.srx.io.bind.Languagemap;
import net.sourceforge.segment.srx.io.bind.Languagerule;
import net.sourceforge.segment.srx.io.bind.Srx;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.sun.xml.txw2.output.StaxSerializer;
/**
* Represents SRX 2.0 document parser. Responsible for creating and initializing
* Document according to given SRX.
*
* @author loomchild
*/
public class Srx2ParserStax implements SrxParser {
private static final Log log = LogFactory.getLog(Srx2Parser.class);
private static final String SCHEMA = "net/sourceforge/segment/res/xml/srx20.xsd";
private static final String NAMESPACE = "http://www.lisa.org/srx20";
private static final QName HEADER_ELEMENT = new QName(NAMESPACE, "header");
private static final QName LANGUAGERULE_ELEMENT = new QName(NAMESPACE, "languagerule");
private static final QName RULE_ELEMENT = new QName(NAMESPACE, "rule");
private static final QName BEFOREBREAK_ELEMENT = new QName(NAMESPACE, "beforebreak");
private static final QName AFTERBREAK_ELEMENT = new QName(NAMESPACE, "afterbreak");
private static final QName LANGUAGEMAP_ELEMENT = new QName(NAMESPACE, "languagemap");
private static final QName CASCADE_ATTRIBUTE = new QName("cascade");
private static final QName LANGUAGERULENAME_ATTRIBUTE = new QName("languagerulename");
private static final QName BREAKING_ATTRIBUTE = new QName("breaking");
private static final QName LANGUAGEPATTERN_ATTRIBUTE = new QName("languagepattern");
/**
* Parses SRX document from reader.
*
* @param reader
* Reader.
* @return Returns initialized document.
*/
public SrxDocument parse(Reader reader) {
try {
Schema schema = getSchema(getReader(getResourceStream(SCHEMA)));
Source source = getSource(reader);
validate(schema, source);
XMLInputFactory factory = XMLInputFactory.newInstance();
XMLEventReader eventReader = factory.createXMLEventReader(source);
SrxDocument document = new SrxDocument();
Map<String, LanguageRule> languageRuleMap = new HashMap<String, LanguageRule>();
LanguageRule languageRule = null;
boolean breaking = false;
String before = null;
String after = null;
boolean inBefore = false;
boolean inAfter = false;
while(eventReader.hasNext()) {
XMLEvent event = eventReader.nextEvent();
if (event.isStartElement()) {
StartElement startElement = event.asStartElement();
if (HEADER_ELEMENT.equals(startElement.getName())) {
Attribute attribute =
startElement.getAttributeByName(CASCADE_ATTRIBUTE);
boolean cascade = false;
if (attribute != null) {
cascade = "yes".equals(attribute.getValue());
}
document.setCascade(cascade);
}
if (LANGUAGERULE_ELEMENT.equals(startElement.getName())) {
Attribute attribute =
startElement.getAttributeByName(LANGUAGERULENAME_ATTRIBUTE);
String name = attribute.getValue();
languageRule = new LanguageRule(name);
}
if (RULE_ELEMENT.equals(startElement.getName())) {
Attribute attribute =
startElement.getAttributeByName(BREAKING_ATTRIBUTE);
breaking = true;
if (attribute != null) {
breaking = !"no".equals(attribute.getValue());
}
}
if (BEFOREBREAK_ELEMENT.equals(startElement.getName())) {
inBefore = true;
before = "";
}
if (AFTERBREAK_ELEMENT.equals(startElement.getName())) {
inAfter = true;
after = "";
}
if (LANGUAGEMAP_ELEMENT.equals(startElement.getName())) {
Attribute patternAttribute =
startElement.getAttributeByName(LANGUAGEPATTERN_ATTRIBUTE);
Attribute nameAttribute =
startElement.getAttributeByName(LANGUAGERULENAME_ATTRIBUTE);
String pattern = patternAttribute.getValue();
String name = nameAttribute.getValue();
LanguageRule mappedLanguageRule = languageRuleMap.get(name);
if (mappedLanguageRule == null) {
log.warn("Language map \"" + pattern
+ "\": language rule \"" + name + "\" not found.");
} else {
document.addLanguageMap(pattern, mappedLanguageRule);
}
}
}
if (event.isEndElement()) {
EndElement endElement = event.asEndElement();
if (LANGUAGERULE_ELEMENT.equals(endElement.getName())) {
languageRuleMap.put(languageRule.getName(), languageRule);
languageRule = null;
}
if (RULE_ELEMENT.equals(endElement.getName())) {
Rule rule = new Rule(breaking, before, after);
languageRule.addRule(rule);
breaking = false;
before = null;
after = null;
}
if (BEFOREBREAK_ELEMENT.equals(endElement.getName())) {
inBefore = false;
}
if (AFTERBREAK_ELEMENT.equals(endElement.getName())) {
inAfter = false;
}
}
if (event.isCharacters()) {
Characters characters = event.asCharacters();
if (inBefore) {
before = before + characters.getData();
}
if (inAfter) {
after = after + characters.getData();
}
}
}
return document;
} catch (XMLStreamException e) {
throw new XmlException("Error parsing document", e);
}
}
}
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