/*
* Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE
* file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file
* to you 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.apache.ode.bpel.rtrep.v2.xpath10.jaxp;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.Map;
import javax.xml.namespace.QName;
import javax.xml.transform.TransformerFactory;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.ode.bpel.common.FaultException;
import org.apache.ode.bpel.rtrep.common.ConfigurationException;
import org.apache.ode.bpel.rtrep.v2.EvaluationContext;
import org.apache.ode.bpel.rtrep.v2.ExpressionLanguageRuntime;
import org.apache.ode.bpel.rtrep.v2.OExpression;
import org.apache.ode.bpel.rtrep.v2.xpath10.OXPath10Expression;
import org.apache.ode.utils.DOMUtils;
import org.apache.ode.utils.ISO8601DateParser;
import org.apache.ode.utils.xsd.Duration;
import org.apache.ode.utils.xsl.XslTransformHandler;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.w3c.dom.Text;
/**
* JAXP based XPath 1.0 Expression Language run-time subsytem.
*/
public class JaxpXPath10ExpressionRuntime implements ExpressionLanguageRuntime {
/** Class-level logger. */
private static final Log __log = LogFactory.getLog(JaxpXPath10ExpressionRuntime.class);
public void initialize(Map properties) throws ConfigurationException {
TransformerFactory trsf = TransformerFactory.newInstance();
__log.debug("JAXP runtime: TransformerFactory impl = " + trsf.getClass());
XslTransformHandler.getInstance().setTransformerFactory(trsf);
}
public String evaluateAsString(OExpression cexp, EvaluationContext ctx) throws FaultException {
return (String) evaluate(cexp, ctx, XPathConstants.STRING);
}
public boolean evaluateAsBoolean(OExpression cexp, EvaluationContext ctx) throws FaultException {
return (Boolean) evaluate(cexp, ctx, XPathConstants.BOOLEAN);
}
public Number evaluateAsNumber(OExpression cexp, EvaluationContext ctx) throws FaultException {
return (Number) evaluate(cexp, ctx, XPathConstants.NUMBER);
}
public List evaluate(OExpression cexp, EvaluationContext ctx) throws FaultException {
List result;
Object someRes = null;
try {
someRes = evaluate(cexp, ctx, XPathConstants.NODESET);
} catch (FaultException ex) {
try {
// JDK implementation of evaluation seems to be more strict about result types than Saxon:
// basic return types are not converted to lists automatically.
// this simulates Saxon behaviour: get a string result and put it in a list.
List resultList = new ArrayList(1);
resultList.add(evaluateAsString(cexp, ctx));
someRes = resultList;
} catch (Exception ex2) {
// re-throw original exception if workaround does not work.
throw ex;
}
}
if (someRes instanceof List) {
result = (List) someRes;
__log.debug("Returned list of size " + result.size());
if ((result.size() == 1) && !(result.get(0) instanceof Node)) {
// Dealing with a Java class
Object simpleType = result.get(0);
// Dates get a separate treatment as we don't want to call toString on them
String textVal;
if (simpleType instanceof Date)
textVal = ISO8601DateParser.format((Date) simpleType);
else
textVal = simpleType.toString();
// Wrapping in a document
Document d = DOMUtils.newDocument();
// Giving our node a parent just in case it's an LValue expression
Element wrapper = d.createElement("wrapper");
Text text = d.createTextNode(textVal);
wrapper.appendChild(text);
d.appendChild(wrapper);
result = Collections.singletonList(text);
}
} else if (someRes instanceof NodeList) {
NodeList retVal = (NodeList) someRes;
__log.debug("Returned node list of size " + retVal.getLength());
result = new ArrayList(retVal.getLength());
for (int m = 0; m < retVal.getLength(); ++m) {
Node val = retVal.item(m);
if (val.getNodeType() == Node.DOCUMENT_NODE)
val = ((Document) val).getDocumentElement();
result.add(val);
}
} else {
result = null;
}
return result;
}
public Node evaluateNode(OExpression cexp, EvaluationContext ctx) throws FaultException {
List retVal = evaluate(cexp, ctx);
if (retVal.size() == 0)
throw new FaultException(cexp.getOwner().constants.qnSelectionFailure, "No results for expression: "
+ cexp);
if (retVal.size() > 1)
throw new FaultException(cexp.getOwner().constants.qnSelectionFailure,
"Multiple results for expression: " + cexp);
return (Node) retVal.get(0);
}
public Calendar evaluateAsDate(OExpression cexp, EvaluationContext context) throws FaultException {
List literal = DOMUtils.toList(evaluate(cexp, context, XPathConstants.NODESET));
if (literal.size() == 0)
throw new FaultException(cexp.getOwner().constants.qnSelectionFailure, "No results for expression: "
+ cexp);
if (literal.size() > 1)
throw new FaultException(cexp.getOwner().constants.qnSelectionFailure,
"Multiple results for expression: " + cexp);
Object date = literal.get(0);
if (date instanceof Calendar)
return (Calendar) date;
if (date instanceof Date) {
Calendar cal = Calendar.getInstance();
cal.setTime((Date) date);
return cal;
}
if (date instanceof Element)
date = ((Element) date).getTextContent();
try {
return ISO8601DateParser.parseCal(date.toString());
} catch (Exception ex) {
String errmsg = "Invalid date format: " + literal;
__log.error(errmsg);
throw new FaultException(cexp.getOwner().constants.qnInvalidExpressionValue, errmsg);
}
}
public Duration evaluateAsDuration(OExpression cexp, EvaluationContext context) throws FaultException {
String literal = this.evaluateAsString(cexp, context);
try {
return new Duration(literal);
} catch (Exception ex) {
String errmsg = "Invalid duration: " + literal;
__log.error(errmsg, ex);
throw new FaultException(cexp.getOwner().constants.qnInvalidExpressionValue, errmsg);
}
}
private Object evaluate(OExpression cexp, EvaluationContext ctx, QName type) throws FaultException {
try {
OXPath10Expression oxpath = (OXPath10Expression) cexp;
__log.debug("JAXP runtime: evaluating " + oxpath.xpath);
// use default XPath implementation
XPathFactory xpf = XPathFactory.newInstance();
__log.debug("JAXP runtime: XPathFactory impl = " + xpf.getClass());
XPath xpe = xpf.newXPath();
xpe.setXPathFunctionResolver(new JaxpFunctionResolver(ctx, oxpath));
xpe.setXPathVariableResolver(new JaxpVariableResolver(ctx, oxpath));
xpe.setNamespaceContext(oxpath.namespaceCtx);
XPathExpression expr = xpe.compile(((OXPath10Expression) cexp).xpath);
Object evalResult =
expr.evaluate(ctx.getRootNode() == null ? DOMUtils.newDocument() : ctx.getRootNode(), type);
if (evalResult != null && __log.isDebugEnabled()) {
__log.debug("Expression " + cexp.toString() + " generated result " + evalResult + " - type="
+ evalResult.getClass().getName());
if (ctx.getRootNode() != null)
__log.debug("Was using context node " + DOMUtils.domToString(ctx.getRootNode()));
}
return evalResult;
} catch (XPathExpressionException e) {
// Extracting the real cause from all this wrapping isn't a simple task
Throwable cause = e.getCause() != null ? e.getCause() : e;
throw new FaultException(cexp.getOwner().constants.qnSubLanguageExecutionFault, cause.getMessage(),
cause);
} catch (WrappedFaultException wre) {
__log.debug("Could not evaluate expression because of ", wre);
throw (FaultException) wre.getCause();
} catch (Throwable t) {
__log.debug("Could not evaluate expression because of ", t);
throw new FaultException(cexp.getOwner().constants.qnSubLanguageExecutionFault, t.getMessage(), t);
}
}
}