/*
* JBoss, Home of Professional Open Source
* Copyright 2013, Red Hat, Inc. and/or its affiliates, and individual
* contributors by the @authors tag. See the copyright.txt in the
* distribution for a full listing of individual contributors.
*
* 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 org.jboss.as.quickstart.xml;
import java.io.InputStream;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import javax.enterprise.context.RequestScoped;
import javax.enterprise.inject.Default;
import javax.inject.Inject;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
/**
* Implementation of parser based on JAXP DOM(W3C).
*
* @author baranowb
*
*/
@RequestScoped
@Default
public class DOMXMLParser extends XMLParser {
// Inject instance of error holder
@Inject
private Errors errorHolder;
private DocumentBuilder builder;
private static final SimpleDateFormat DATE_FORMATTER = new SimpleDateFormat("yyyy-MM-dd");
DOMXMLParser() throws Exception {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
/*
* bizarrely, setValidating refers to DTD validation only, and we are using schema validation
*/
factory.setValidating(false);
factory.setNamespaceAware(true);
this.builder = factory.newDocumentBuilder();
// Set SAX error handler. So errors atleast show up in console
this.builder.setErrorHandler(new ErrorHandler() {
@Override
public void warning(SAXParseException e) throws SAXException {
errorHolder.addErrorMessage("warning", e);
}
@Override
public void fatalError(SAXParseException e) throws SAXException {
errorHolder.addErrorMessage("fatal error", e);
}
@Override
public void error(SAXParseException e) throws SAXException {
errorHolder.addErrorMessage("error", e);
}
});
}
@Override
public List<Book> parseInternal(InputStream is) throws Exception {
Document document = this.builder.parse(is);
List<Book> catalog = new ArrayList<Book>();
Element root = document.getDocumentElement();
if (!root.getLocalName().equals("catalog")) {
throw new RuntimeException("Wrong element: " + root.getTagName());
}
NodeList children = root.getChildNodes();
for (int index = 0; index < children.getLength(); index++) {
Node n = children.item(index);
String childName = n.getLocalName();
if (childName == null)
continue;
if (n.getLocalName().equals("book")) {
Book b = parseBook((Element) n);
catalog.add(b);
}
}
return catalog;
}
private Book parseBook(Element n) {
Book b = new Book();
NodeList children = n.getChildNodes();
/*
* parse book element, we have to once more iterate over children.
*/
for (int index = 0; index < children.getLength(); index++) {
Node child = children.item(index);
String childName = child.getLocalName();
// empty/text nodes dont have name
if (childName == null)
continue;
if (childName.equals("author")) {
Element childElement = (Element) child;
String textVal = getTextValue(childElement);
b.setAuthor(textVal);
} else if (childName.equals("title")) {
Element childElement = (Element) child;
String textVal = getTextValue(childElement);
b.setTitle(textVal);
} else if (childName.equals("genre")) {
Element childElement = (Element) child;
String textVal = getTextValue(childElement);
b.setGenre(textVal);
} else if (childName.equals("price")) {
Element childElement = (Element) child;
String textVal = getTextValue(childElement);
b.setPrice(Float.parseFloat(textVal));
} else if (childName.equals("publish_date")) {
Element childElement = (Element) child;
String textVal = getTextValue(childElement);
Date d;
try {
d = DATE_FORMATTER.parse(textVal);
b.setPublishDate(d);
} catch (ParseException e) {
throw new RuntimeException(e);
}
} else if (childName.equals("description")) {
Element childElement = (Element) child;
String textVal = getTextValue(childElement);
b.setDescription(textVal);
}
}
return b;
}
private String getTextValue(Element childElement) {
NodeList nl = childElement.getChildNodes();
if (nl != null && nl.getLength() > 0) {
Node node = nl.item(0);
if (node.getNodeType() == Node.TEXT_NODE) {
return node.getNodeValue();
}
}
return "";
}
}