, , , , ,

Custom XSLT with Oracle XDK library in ORACLE DB

понедельник, 1 ноября 2010 г. Оставить комментарий

Another transformer based on the Oracle XDK. The transformer provides several useful features not included in XSLT 1.0.

About the new features I'll discuss in the next post.

Java Source:

create or replace and compile java source named ora_20000_xmlutility as
package ru.ora_20000.xml;

import org.xml.sax.SAXException;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Reader;
import java.io.Writer;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

import oracle.xml.parser.v2.DOMParser;
import oracle.xml.parser.v2.XMLDocument;
import oracle.xml.parser.v2.XSLException;
import oracle.xml.parser.v2.XSLProcessor;
import oracle.xml.parser.v2.XSLStylesheet;
import oracle.xml.parser.v2.XMLParseException;

import oracle.sql.CLOB;

public class xmlutility {

private static XMLDocument parseDocument(String xmlText) throws Exception
{
DOMParser parser = new DOMParser();
parser.setPreserveWhitespace(true);

StringReader sr_xml = new StringReader(xmlText);
try {
parser.parse(sr_xml);
} catch (XMLParseException e) {
throw new Exception("parseDocument ERROR-XMLParseException: " + e.getMessage());
} catch (SAXException e) {
throw new Exception("parseDocument ERROR-SAXException: " + e.getMessage());
} catch (IOException e) {
throw new Exception("parseDocument ERROR-IOException: " + e.getMessage());
}
return parser.getDocument();
}

private static String processXSL(XMLDocument xmlDocument, XMLDocument xsltDocument) throws Exception
{
XSLProcessor processor = new XSLProcessor();
XSLStylesheet xslStylesheet;
StringWriter strWriter;

try {
xslStylesheet = processor.newXSLStylesheet(xsltDocument);
processor.showWarnings(true);
processor.setErrorStream(System.err);

strWriter = new StringWriter();
processor.processXSL(xslStylesheet, xmlDocument, new PrintWriter(strWriter));
} catch (XSLException e) {
String message = "";
for(int i=0; i < e.getNumMessages(); i++)
{
message = message + "Message=" + e.getMessage(i) + ", Line=" + e.getLineNumber(i) + ", Row=" + e.getLineNumber(i) + "URI=" + e.getSystemId(i);
}
throw new Exception("processXSL ERROR-XSLException: " + message);
} catch (IOException e) {
throw new Exception("processXSL ERROR-IOException: " + e.getMessage());
}
return strWriter.getBuffer().toString();
}

public static String getStringFromClob(CLOB clob) throws Exception
{
Reader reader;
StringBuffer stringBuffer;

try
{
reader = clob.getCharacterStream();
stringBuffer = new StringBuffer();

int numchars;
char[] buffer = new char[clob.getChunkSize()];
while ((numchars = reader.read(buffer, 0, clob.getChunkSize())) != -1)
{
stringBuffer.append(buffer, 0, numchars);
}
reader.close();
} catch (SQLException e) {
throw new Exception("getStringFromClob ERROR-SQLException: " + e.getMessage());
} catch (IOException e) {
throw new Exception("getStringFromClob ERROR-IOException: " + e.getMessage());
}
return stringBuffer.toString();
}

public static CLOB getClobFromString(String string) throws Exception
{
CLOB clob = null;
Writer writer = null;
try {
Connection connection = DriverManager.getConnection("jdbc:default:connection:");

clob = CLOB.createTemporary(connection, true, CLOB.DURATION_SESSION);
writer = clob.setCharacterStream(1L);
if (string != null) { writer.write(string); }
writer.flush();
writer.close();
} catch (SQLException e) {
throw new Exception("getClobFromString ERROR-SQLException: " + e.getMessage());
} catch (IOException e) {
throw new Exception("getClobFromString ERROR-IOException: " + e.getMessage());
} finally {
if (writer != null) { writer.close(); }
}
return clob;
}

public static String transformXmlString(String xmlText, String xslText) throws Exception
{
if (xmlText == null || xslText == null)
{
return null;
}

XMLDocument xmlDoc = parseDocument(xmlText);
XMLDocument xslDoc = parseDocument(xslText);
return processXSL(xmlDoc, xslDoc);
}

public static CLOB transformXmlClob(CLOB xmlClob, CLOB xslClob) throws Exception
{
if (xmlClob == null || xslClob == null)
{
return null;
}

String xmlText = getStringFromClob(xmlClob);
String xslText = getStringFromClob(xslClob);
String xmlResult = transformXmlString(xmlText, xslText);
return getClobFromString(xmlResult);
}

}

PL\SQL wrapper:


create or replace package ora_20000_xmlutility is

function XMLTransformClob( xmlText clob
,xslText clob
) return clob;

function XMLTransform( xmlText varchar2
,xslText varchar2
) return varchar2;


end ora_20000_xmlutility;
/
create or replace package body ora_20000_xmlutility is

function XMLTransformClob( xmlText clob
,xslText clob
) return clob
is
language java name 'ru.ora_20000.xml.xmlutility.transformXmlClob(oracle.sql.CLOB, oracle.sql.CLOB) return oracle.sql.CLOB';

function XMLTransform( xmlText varchar2
,xslText varchar2
) return varchar2
is
language java name 'ru.ora_20000.xml.xmlutility.transformXmlString(java.lang.String, java.lang.String) return java.lang.String';

end ora_20000_xmlutility;
/

0 коммент. »

Оставьте Ваш комментарий