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/* Copyright 2013 Benjamin Linskey
*
* 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.
*/
package com.benlinskey.grdbc;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.UnsupportedEncodingException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import edu.unc.epidoc.transcoder.TransCoder;
/**
* This class provides methods to parse a chunk of XML containing a lexicon
* entry, modify the data contained therein, and return data to be inserted
* into the database.
* @author Ben Linskey
*/
public class LexiconParser {
private Document doc;
private TransCoder transcoder;
/**
* Class constructor.
* @param xml the XML to parse
* @throws ParserConfigurationException
* @throws IOException
* @throws SAXException
*/
public LexiconParser(String xml) throws ParserConfigurationException, SAXException, IOException {
// Parse the XML and create a Document.
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
InputSource is = new InputSource(new StringReader(xml));
doc = db.parse(is);
// Create a TransCoder for converting Beta Code to Greek characters.
try {
transcoder = new TransCoder("BetaCode", "UnicodeC");
} catch (Exception e) {
e.printStackTrace();
System.exit(1);
}
}
/**
* Returns a Beta Code representation of this entry's word, stripped of
* all diacritics.
* @return this entry's word in Beta Code without diacritics
*/
public String getBetaNoSymbols() {
// Get the word and replace all symbols with an empty string.
return getBetaSymbols().replaceAll("[^a-zA-Z]", "");
}
/**
* Returns a Beta Code representation of this entry's word.
* @return this entry's word in Beta Code
*/
public String getBetaSymbols() {
// We just need the "key" attribute from the "entry" element.
Node entry = doc.getElementsByTagName("entry").item(0);
return entry.getAttributes().getNamedItem("key").getTextContent();
}
/**
* Returns this entry's word in Greek characters.
* @return this entry's word in Greek characters
*/
public String getGreekFullWord() {
// Use the transcoder to convert the beta code to Greek.
return betaToGreek(getBetaSymbols());
}
/**
* Returns this entry's word in Greek characters, stripped of all
* diacritics.
* @return this entry's word in Greek characters without diacritics
*/
public String getGreekNoSymbols() {
// Get beta code with no symbols other than the capital letter marker.
String beta = getBetaSymbols().replaceAll("[^a-zA-Z\\*]", "");
// Use the transcoder to convert the beta code to Greek.
return betaToGreek(beta);
}
/**
* Returns this entry's word in all lowercase Greek characters, stripped
* of all diacritics.
* @return this entry's word in lowercase Greek characters without
* diacritics
*/
public String getGreekLowercase() {
return getGreekNoSymbols().toLowerCase();
}
/**
* Returns the XML for this entry, with all Beta Code converted to Greek
* characters.
* @return the XML for this entry with all Beta Code converted to Greek
* characters
*/
public String getEntry() {
transcodeInElements("orth");
transcodeInElements("ref");
transcodeInElements("foreign");
return getUpdatedXML();
}
/**
* Transcodes beta code to Greek in elements with the given name.
* @param element the name of the element to search for
*/
private void transcodeInElements(String element) {
NodeList nodeList = doc.getElementsByTagName(element);
for (int i = 0; i < nodeList.getLength(); i++) {
Node elementNode = nodeList.item(i);
Node langAttr = elementNode.getAttributes().getNamedItem("lang");
if (langAttr != null) {
String lang = langAttr.getTextContent();
if (lang.equals("greek")) {
String greek = betaToGreek(elementNode.getTextContent());
langAttr.setTextContent(greek);
}
}
}
}
/**
* Returns a string containing an XML representation of the document in its
* current state.
* @return a string containing an XML representation of the document in its
* current state
*/
private String getUpdatedXML() {
StringWriter writer = new StringWriter();
try {
TransformerFactory tf = TransformerFactory.newInstance();
Transformer transformer = tf.newTransformer();
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(writer);
transformer.transform(source, result);
} catch (TransformerConfigurationException e) {
e.printStackTrace();
System.exit(1);
} catch (TransformerException e) {
e.printStackTrace();
System.exit(1);
}
return writer.toString();
}
/**
* Converts Beta Code to Greek characters.
* @param beta the Beta Code to transcode
* @return the Greek equivalent of the specified Beta Code
*/
private String betaToGreek(String beta) {
String greek = null;
try {
greek = transcoder.getString(beta);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
System.exit(1);
}
return greek;
}
}
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