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extended XmlHelper to take InputStream and always use \n as line sep

This commit is contained in:
Robert von Burg 2013-08-12 11:02:02 +02:00
parent 300399e9c0
commit f53c20d515
1 changed files with 44 additions and 8 deletions
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52
src/main/java/ch/eitchnet/utils/helper/XmlHelper.java
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@ -20,7 +20,10 @@
package ch.eitchnet.utils.helper;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
@ -51,6 +54,16 @@ import ch.eitchnet.utils.exceptions.XmlException;
*/
public class XmlHelper {
/**
* PROP_LINE_SEPARATOR = "line.separator" : the system property to fetch defined line separator
*/
public static final String PROP_LINE_SEPARATOR = "line.separator";
/**
* UNIX_LINE_SEP = "\n" : mostly we want this line separator, instead of the windows version
*/
public static final String UNIX_LINE_SEP = "\n";
/**
* DEFAULT_ENCODING = "UTF-8" : defines the default UTF-8 encoding expected of XML files
*/
@ -63,25 +76,38 @@ public class XmlHelper {
*
* @param xmlFile
* the {@link File} which has the path to the XML file to read
*
* @return a {@link Document} object containing the {@link Element}s of the XML file
*/
public static void parseDocument(File xmlFile, DefaultHandler xmlHandler) {
try {
XmlHelper.logger.info("Parsing XML document " + xmlFile.getAbsolutePath());
parseDocument(new FileInputStream(xmlFile), xmlHandler);
} catch (FileNotFoundException e) {
throw new XmlException("The XML file could not be read: " + xmlFile.getAbsolutePath(), e);
}
}
/**
* Parses an XML file on the file system and returns the resulting {@link Document} object
*
* @param xmlFileInputStream
* the XML {@link InputStream} which is to be parsed
*/
public static void parseDocument(InputStream xmlFileInputStream, DefaultHandler xmlHandler) {
try {
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
XmlHelper.logger.info("Parsing XML document " + xmlFile.getAbsolutePath());
sp.parse(xmlFile, xmlHandler);
sp.parse(xmlFileInputStream, xmlHandler);
} catch (ParserConfigurationException e) {
throw new XmlException("Failed to initialize a SAX Parser: " + e.getLocalizedMessage(), e);
throw new XmlException("Failed to initialize a SAX Parser: " + e.getMessage(), e);
} catch (SAXException e) {
throw new XmlException("The XML file " + xmlFile.getAbsolutePath() + " is not parseable:", e);
throw new XmlException("The XML stream is not parseable: " + e.getMessage(), e);
} catch (IOException e) {
throw new XmlException("The XML could not be read: " + xmlFile.getAbsolutePath());
throw new XmlException("The XML stream not be read: " + e.getMessage(), e);
}
}
@ -100,13 +126,20 @@ public class XmlHelper {
XmlHelper.logger.info("Exporting document element " + document.getNodeName() + " to " + file.getAbsolutePath());
String lineSep = System.getProperty(PROP_LINE_SEPARATOR);
try {
String encoding = document.getInputEncoding();
if (encoding == null || encoding.isEmpty()) {
XmlHelper.logger.info("No encoding passed. Using default encoding " + XmlHelper.DEFAULT_ENCODING);
encoding = XmlHelper.DEFAULT_ENCODING;
}
if (!lineSep.equals("\n")) {
XmlHelper.logger.info("Overriding line separator to \\n");
System.setProperty(PROP_LINE_SEPARATOR, UNIX_LINE_SEP);
}
// Set up a transformer
TransformerFactory transfac = TransformerFactory.newInstance();
Transformer transformer = transfac.newTransformer();
@ -115,7 +148,7 @@ public class XmlHelper {
transformer.setOutputProperty(OutputKeys.METHOD, "xml");
transformer.setOutputProperty(OutputKeys.ENCODING, encoding);
transformer.setOutputProperty("{http://xml.apache.org/xalan}indent-amount", "2");
//transformer.setOutputProperty("{http://xml.apache.org/xalan}line-separator", "\t");
// transformer.setOutputProperty("{http://xml.apache.org/xalan}line-separator", "\t");
// Transform to file
StreamResult result = new StreamResult(file);
@ -126,6 +159,9 @@ public class XmlHelper {
throw new XmlException("Exception while exporting to file: " + e, e);
} finally {
System.setProperty(PROP_LINE_SEPARATOR, lineSep);
}
}