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/**
* Copyright 2010 JBoss Inc
*
* 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.jbpm.migration;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.Reader;
import java.io.StringWriter;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.ErrorListener;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.URIResolver;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.sax.TransformerHandler;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;
import org.apache.log4j.Logger;
import org.apache.xalan.trace.PrintTraceListener;
import org.apache.xalan.trace.TraceManager;
import org.apache.xalan.transformer.TransformerImpl;
import org.w3c.dom.Document;
import org.w3c.dom.ls.LSInput;
import org.w3c.dom.ls.LSResourceResolver;
import org.xml.sax.ErrorHandler;
import org.xml.sax.SAXParseException;
/**
* Convenience class for working with XML documents.
*
* @author Eric D. Schabell
* @author Maurice de Chateau
*/
public final class XmlUtils {
static final Logger LOGGER = Logger.getLogger(XmlUtils.class);
private static final DocumentBuilderFactory FACTORY = DocumentBuilderFactory.newInstance();
static {
FACTORY.setNamespaceAware(true);
}
/** Private constructor to prevent instantiation. */
private XmlUtils() {
}
/**
* Create an empty XML structure.
*
* @return An empty DOM tree.
*/
public static Document createEmptyDocument() {
Document output = null;
try {
final DocumentBuilder db = FACTORY.newDocumentBuilder();
db.setErrorHandler(new ParserErrorHandler());
output = db.newDocument();
} catch (final Exception ex) {
LOGGER.error("Problem creating empty XML document.", ex);
}
return output;
}
/**
* Parse a File containing an XML structure into a DOM tree.
*
* @param input
* The input XML file.
* @return The corresponding DOM tree, or null if the input could not be parsed successfully.
*/
public static Document parseFile(final File input) {
Document output = null;
try {
final DocumentBuilder db = FACTORY.newDocumentBuilder();
db.setErrorHandler(new ParserErrorHandler());
output = db.parse(input);
} catch (final Exception ex) {
String msg = "Problem parsing the input XML file";
if (ex instanceof SAXParseException) {
msg += " at line #" + ((SAXParseException) ex).getLineNumber();
}
LOGGER.error(msg, ex);
}
return output;
}
/**
* Parse a String containing an XML structure into a DOM tree.
*
* @param input
* The input XML String.
* @return The corresponding DOM tree, or null if the input could not be parsed successfully.
*/
public static Document parseString(final String input) {
Document output = null;
try {
final DocumentBuilder db = FACTORY.newDocumentBuilder();
db.setErrorHandler(new ParserErrorHandler());
output = db.parse(new ByteArrayInputStream(input.getBytes()));
} catch (final Exception ex) {
String msg = "Problem parsing the input XML string";
if (ex instanceof SAXParseException) {
msg += " at line #" + ((SAXParseException) ex).getLineNumber();
}
LOGGER.error(msg, ex);
}
return output;
}
/**
* Write an XML document (formatted) to a given File.
*
* @param input
* The input XML document.
* @param output
* The intended File.
*/
public static void writeFile(final Document input, final File output) {
final StreamResult result = new StreamResult(new StringWriter());
format(new DOMSource(input), result);
try {
new FileWriter(output).write(result.getWriter().toString());
} catch (final IOException ioEx) {
LOGGER.error("Problem writing XML to file.", ioEx);
}
}
/**
* Validate an XML document against an XML Schema definition.
*
* @param input
* The input XML document.
* @param schemas
* The XML Schema(s) against which the document must be validated.
* @return Whether the validation was successful.
*/
public static boolean validate(final Source input, final Source[] schemas) {
boolean isValid = true;
try {
final SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
factory.setResourceResolver(new SchemaLSResourceResolver());
final Validator val = factory.newSchema(schemas).newValidator();
final ParserErrorHandler eh = new ParserErrorHandler();
val.setErrorHandler(eh);
val.validate(input);
if (eh.didErrorOccur()) {
isValid = false;
eh.logErrors(LOGGER);
}
} catch (final Exception ex) {
LOGGER.error("Problem validating the given process definition.", ex);
isValid = false;
}
return isValid;
}
/**
* Transform an XML document according to an XSL style sheet.
*
* @param input
* The input XML {@link Source}.
* @param sheet
* The XSL style sheet according to which the document must be transformed.
* @param output
* The {@link Result} in which the transformed XML is to be stored.
*/
public static void transform(final Source input, final Source sheet, final Result output) {
try {
final DOMResult intermediate = new DOMResult(createEmptyDocument());
// Transform.
createTransformer(sheet).transform(input, intermediate);
// Format.
format(new DOMSource(intermediate.getNode()), output);
} catch (final Exception ex) {
LOGGER.error("Problem transforming XML file.", ex);
}
}
/**
* Format an XML {@link Source} to a pretty-printable {@link StreamResult}.
*
* @param input
* The (unformatted) input XML {@link Source}.
* @return The formatted {@link StreamResult}.
*/
public static void format(final Source input, final Result output) {
try {
// Use an identity transformation to write the source to the result.
final Transformer transformer = createTransformer(null);
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.transform(input, output);
} catch (final Exception ex) {
LOGGER.error("Problem formatting DOM representation.", ex);
}
}
/**
* Create a {@link Transformer} from the given sheet.
*
* @param xsltSource
* The sheet to be used for the transformation, or null if an identity transformator is needed.
* @return The created {@link Transformer}
* @throws Exception
* If the creation or instrumentation of the {@link Transformer} runs into trouble.
*/
private static Transformer createTransformer(final Source xsltSource) throws Exception {
final TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = null;
if (xsltSource != null) {
// Create a resolver for imported sheets (assumption: available from classpath or the root of the jar).
final URIResolver resolver = new URIResolver() {
@Override
public Source resolve(final String href, final String base) throws TransformerException {
return new StreamSource(Thread.currentThread().getContextClassLoader().getResourceAsStream(href));
}
};
transformerFactory.setURIResolver(resolver);
// Transformer using the given sheet.
transformer = transformerFactory.newTransformer(xsltSource);
transformer.setURIResolver(resolver);
} else {
// Transformer without a sheet, i.e. for "identity transform" (e.g. formatting).
transformer = transformerFactory.newTransformer();
}
if (LOGGER.isDebugEnabled()) {
instrumentTransformer(transformer);
}
return transformer;
}
/**
* Adds a little verbosity to a constructed Transformer.
*
* @param transformer
* The Transformer which may produce some output.
* @throws Exception
* If setting/adding a listener gives a problem.
*/
private static void instrumentTransformer(Transformer transformer) throws Exception {
transformer.setErrorListener(new TransformerErrorListener());
if (transformer instanceof TransformerHandler) {
transformer = ((TransformerHandler) transformer).getTransformer();
}
if (transformer instanceof TransformerImpl) {
final TraceManager tm = ((TransformerImpl) transformer).getTraceManager();
final PrintTraceListener ptl = new PrintTraceListener(new PrintWriter(System.out));
// Print information as each node is 'executed' in the stylesheet.
ptl.m_traceElements = true;
// Print information after each result-tree generation event.
ptl.m_traceGeneration = true;
// Print information after each selection event.
ptl.m_traceSelection = true;
// Print information whenever a template is invoked.
ptl.m_traceTemplates = true;
// Print information whenever an extension call is made.
ptl.m_traceExtension = true;
tm.addTraceListener(ptl);
}
}
private static class ParserErrorHandler extends ErrorCollector implements ErrorHandler {
}
private static class TransformerErrorListener extends ErrorCollector implements ErrorListener {
}
/**
* Custom resource resolver used to load imported and included XSD documents
* from classpath resources located at the resource root.
*/
private static class SchemaLSResourceResolver implements LSResourceResolver {
@Override
public LSInput resolveResource(String type, String namespaceURI,
String publicId, String systemId, String baseURI) {
return new LSInputImpl(publicId, systemId, baseURI,
Thread.currentThread().getContextClassLoader().getResourceAsStream(systemId));
}
}
/**
* Application-specific LSInput implementation required for loading schema documents
* from classpath.
*
* It implements only those methods required (returning the resource as InputStream)
* and assumes that resource (XSD schema) is encoded using UTF-8.
*/
private static class LSInputImpl implements LSInput {
public static final String ENCODING = "UTF-8";
private String publicId;
private String systemId;
private String baseURI;
private boolean certifiedText;
private final InputStream inputStream;
public LSInputImpl(String publicId, String systemId,
String baseURI, InputStream inputStream) {
this.publicId = publicId;
this.systemId = systemId;
this.baseURI = baseURI;
this.certifiedText = false;
this.inputStream = inputStream;
}
@Override
public Reader getCharacterStream() {
return null;
}
@Override
public void setCharacterStream(Reader characterStream) {
throw new UnsupportedOperationException("Not supported.");
}
@Override
public InputStream getByteStream() {
return this.inputStream;
}
@Override
public void setByteStream(InputStream byteStream) {
throw new UnsupportedOperationException("Not supported.");
}
@Override
public String getStringData() {
return null;
}
@Override
public void setStringData(String stringData) {
throw new UnsupportedOperationException("Not supported.");
}
@Override
public String getSystemId() {
return this.systemId;
}
@Override
public void setSystemId(String systemId) {
this.systemId = systemId;
}
@Override
public String getPublicId() {
return this.publicId;
}
@Override
public void setPublicId(String publicId) {
this.publicId = publicId;
}
@Override
public String getBaseURI() {
return this.baseURI;
}
@Override
public void setBaseURI(String baseURI) {
this.baseURI = baseURI;
}
@Override
public String getEncoding() {
return ENCODING;
}
@Override
public void setEncoding(String encoding) {
throw new UnsupportedOperationException("Not supported.");
}
@Override
public boolean getCertifiedText() {
return this.certifiedText;
}
@Override
public void setCertifiedText(boolean certifiedText) {
this.certifiedText = certifiedText;
}
}
}
