com.spun.util.ConfigXMLFileWriter Maven / Gradle / Ivy
package com.spun.util;
import org.lambda.functions.Function1;
import org.lambda.query.Query;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.lang.reflect.Field;
import java.util.Arrays;
import java.util.List;
/**
* A static class of convenience functions for database access
**/
public class ConfigXMLFileWriter
{
public static void writeToFile(Class clazz, String fileName, String[] exclude)
{
Document domDocument = createDocument();
Field[] fields = getFields(clazz, exclude);
for (int i = 0; i < fields.length; i++)
{
addLine(fields[i], domDocument);
}
writeToIndentedXMLFile(fileName, domDocument);
}
private static void addLine(Field field, Document domDocument)
{
Element elem = domDocument.createElement(field.getName());
if (field.getType().isArray())
{
Element inner = domDocument.createElement("VALUE");
inner.appendChild(domDocument.createTextNode(" "));
elem.appendChild(inner);
inner = domDocument.createElement("VALUE");
inner.appendChild(domDocument.createTextNode(" "));
elem.appendChild(inner);
}
else
{
elem.appendChild(domDocument.createTextNode(" "));
}
domDocument.getDocumentElement().appendChild(elem);
}
public static Field[] getFields(Class clazz, String... exclude)
{
Field[] fields = clazz.getFields();
final List excludeNames = Arrays.asList(exclude);
Function1 selector = (Field a) -> (ClassUtils.IsPublicStatic(a)
&& ClassUtils.isPrimitiveField(a) && !excludeNames.contains(a.getName()));
fields = Query.where(fields, selector).toArray(new Field[0]);
return Query.orderBy(fields, a -> (a.getName()));
}
private static Document createDocument()
{
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
documentBuilderFactory.setNamespaceAware(false);
documentBuilderFactory.setIgnoringElementContentWhitespace(true);
DocumentBuilder documentBuilder = ObjectUtils.throwAsError(() -> documentBuilderFactory.newDocumentBuilder());
return documentBuilder.getDOMImplementation().createDocument("", "XML", null);
}
public static void writeToIndentedXMLFile(String configFile, Document domDocument)
{
try
{
DataOutputStream out = new DataOutputStream(new FileOutputStream(configFile));
TransformerFactory tFactory = TransformerFactory.newInstance();
Transformer transformer = tFactory.newTransformer();
DOMSource source = new DOMSource(domDocument);
StreamResult result = new StreamResult(out);
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "2");
transformer.transform(source, result);
out.close();
}
catch (Exception e)
{
throw ObjectUtils.throwAsError(e);
}
}
}