Java tutorial
/* * 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.v1.xpath10.jaxp; import java.net.URI; import java.net.URISyntaxException; import java.util.HashMap; import java.util.List; import javax.xml.namespace.QName; import javax.xml.transform.dom.DOMSource; import javax.xml.xpath.XPathFunction; import javax.xml.xpath.XPathFunctionException; import javax.xml.xpath.XPathFunctionResolver; 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.Constants; import org.apache.ode.bpel.rtrep.v1.EvaluationContext; import org.apache.ode.bpel.rtrep.v1.OLink; import org.apache.ode.bpel.rtrep.v1.OProcess; import org.apache.ode.bpel.rtrep.v1.OScope; import org.apache.ode.bpel.rtrep.v1.OXslSheet; import org.apache.ode.bpel.rtrep.v1.xpath10.OXPath10Expression; import org.apache.ode.bpel.rtrep.v1.xpath10.OXPath10ExpressionBPEL20; import org.apache.ode.bpel.rtrep.v1.xpath10.XslRuntimeUriResolver; import org.apache.ode.utils.DOMUtils; import org.apache.ode.utils.Namespaces; import org.apache.ode.utils.xsl.XslTransformHandler; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; /** * JAXP function resolver for BPEL XPath functions */ public class JaxpFunctionResolver implements XPathFunctionResolver { private static final Log __log = LogFactory.getLog(JaxpFunctionResolver.class); private EvaluationContext _ectx; private OXPath10Expression _oxpath; public JaxpFunctionResolver(EvaluationContext ectx, OXPath10Expression oxpath) { _ectx = ectx; _oxpath = oxpath; } public XPathFunction resolveFunction(QName functionName, int arity) { __log.debug("JAXP runtime: Resolving function " + functionName); final String namespaceURI = functionName.getNamespaceURI(); if (namespaceURI == null) { throw new NullPointerException("Undeclared namespace for " + functionName); } if (namespaceURI.equals(Namespaces.BPEL11_NS) || namespaceURI.equals(Namespaces.WS_BPEL_20_NS) || namespaceURI.equals(Namespaces.WSBPEL2_0_FINAL_EXEC)) { String localName = functionName.getLocalPart(); if (Constants.EXT_FUNCTION_GETVARIABLEDATA.equals(localName)) { return new GetVariableData(); } if (Constants.EXT_FUNCTION_GETVARIABLEPROPERTY.equals(localName)) { return new GetVariableProperty(); } if (Constants.EXT_FUNCTION_GETLINKSTATUS.equals(localName)) { return new GetLinkStatus(); } if (Constants.EXT_FUNCTION_DOXSLTRANSFORM.equals(localName)) { return new DoXslTransform(); } throw new NullPointerException("Unknown BPEL function: " + functionName); } return null; } public class GetLinkStatus implements XPathFunction { public Object evaluate(List args) throws XPathFunctionException { if (args.size() != 1) throw new XPathFunctionException(new FaultException( new QName(Namespaces.ODE_EXTENSION_NS, "getLinkStatusInvalidSource"), "Illegal Arguments")); OLink olink = _oxpath.links.get(args.get(0)); try { return _ectx.isLinkActive(olink) ? Boolean.TRUE : Boolean.FALSE; } catch (FaultException e) { throw new XPathFunctionException(new FaultException( new QName(Namespaces.ODE_EXTENSION_NS, "getLinkStatusInvalidSource"), e)); } } } public class GetVariableData implements XPathFunction { public Object evaluate(List args) throws XPathFunctionException { if (__log.isDebugEnabled()) { __log.debug("call(context=" + _ectx + " args=" + args + ")"); } String varname = (String) args.get(0); String partname = args.size() > 1 ? (String) args.get(1) : null; String xpathStr = args.size() > 2 ? (String) args.get(2) : null; OXPath10Expression.OSigGetVariableData sig = _oxpath.resolveGetVariableDataSig(varname, partname, xpathStr); if (sig == null) { String msg = "InternalError: Attempt to use an unknown getVariableData signature: " + args; if (__log.isFatalEnabled()) __log.fatal(msg); throw new XPathFunctionException(msg); } try { Node ret = _ectx.readVariable(sig.variable, sig.part); if (sig.location != null) ret = _ectx.evaluateQuery(ret, sig.location); if (__log.isDebugEnabled()) { __log.debug("bpws:getVariableData(" + args + ")' = " + ret); } return ret; } catch (FaultException e) { __log.error("bpws:getVariableData(" + args + ") threw FaultException"); throw new XPathFunctionException(e); } } } public class GetVariableProperty implements XPathFunction { public Object evaluate(List args) throws XPathFunctionException { if (args.size() != 2) { throw new XPathFunctionException(new FaultException( new QName(Namespaces.ODE_EXTENSION_NS, "getVariablePropertyInvalidSource"), "Missing required arguments")); } OScope.Variable var = _oxpath.vars.get(args.get(0)); OProcess.OProperty property = _oxpath.properties.get(args.get(1)); if (__log.isDebugEnabled()) { __log.debug("function call:'bpws:getVariableProperty(" + var + "," + property + ")'"); } try { return _ectx.readMessageProperty(var, property); } catch (FaultException e) { throw new XPathFunctionException(e); } } } public class DoXslTransform implements XPathFunction { public Object evaluate(List args) throws XPathFunctionException { if (args.size() < 2 || (args.size() % 2) != 0) throw new XPathFunctionException( new FaultException(new QName(Namespaces.ODE_EXTENSION_NS, "doXslTransformInvalidSource"), "Invalid arguments")); if (__log.isDebugEnabled()) { __log.debug("call(context=" + _ectx + " args=" + args + ")"); } if (!(_oxpath instanceof OXPath10ExpressionBPEL20)) { throw new IllegalStateException("XPath function bpws:doXslTransform not supported in BPEL 1.1!"); } Element varElmt; try { if (args.get(1) instanceof List) { List elmts = (List) args.get(1); if (elmts.size() != 1) throw new XPathFunctionException(new FaultException( _oxpath.getOwner().constants.qnXsltInvalidSource, "Second parameter of the bpws:doXslTransform function MUST point to a single " + "element node.")); varElmt = (Element) elmts.get(0); } else { varElmt = (Element) args.get(1); } } catch (ClassCastException e) { throw new XPathFunctionException( new FaultException(_oxpath.getOwner().constants.qnXsltInvalidSource, "Second parameter of the bpws:doXslTransform function MUST point to a single " + "element node.")); } URI xslUri; try { xslUri = new URI((String) args.get(0)); } catch (URISyntaxException use) { // Shouldn't happen, checked at compilation time throw new XPathFunctionException("First parameter of the bpws:doXslTransform isn't a valid URI!"); } OXslSheet xslSheet = _oxpath.xslSheets.get(xslUri); // Shouldn't happen, checked at compilation time if (xslSheet == null) throw new XPathFunctionException("Couldn't find the XSL sheet " + args.get(0) + ", process compilation or deployment was probably incomplete!"); if (!(varElmt instanceof Element)) { throw new XPathFunctionException( new FaultException(_oxpath.getOwner().constants.qnXsltInvalidSource, "Second parameter of the bpws:doXslTransform function MUST point to a single " + "element node.")); } HashMap<QName, Object> parametersMap = null; if (args.size() > 2) { parametersMap = new HashMap<QName, Object>(); for (int idx = 2; idx < args.size(); idx += 2) { QName keyQName = _oxpath.namespaceCtx.derefQName((String) args.get(idx)); Object paramElmt; if (args.get(idx + 1) instanceof List) { paramElmt = ((List) args.get(idx + 1)).get(0); } else paramElmt = args.get(idx + 1); parametersMap.put(keyQName, paramElmt); } } if (__log.isDebugEnabled()) __log.debug("Executing XSL sheet " + args.get(0) + " on element " + DOMUtils.domToString(varElmt)); Document varDoc = DOMUtils.newDocument(); varDoc.appendChild(varDoc.importNode(varElmt, true)); Object result; DOMSource source = new DOMSource(varDoc); XslRuntimeUriResolver resolver = new XslRuntimeUriResolver(_oxpath, _ectx.getBaseResourceURI()); XslTransformHandler.getInstance().cacheXSLSheet(_ectx.getBaseResourceURI(), xslUri, xslSheet.sheetBody, resolver); try { result = XslTransformHandler.getInstance().transform(_ectx.getBaseResourceURI(), xslUri, source, parametersMap, resolver); } catch (Exception e) { e.printStackTrace(); throw new XPathFunctionException( new FaultException(_oxpath.getOwner().constants.qnSubLanguageExecutionFault, e.toString())); } if (result instanceof Node) return ((Node) result).getChildNodes(); else return result; } } }