| /* |
| * 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.elang.xpath10.compiler; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import javax.xml.namespace.QName; |
| |
| import org.apache.ode.bpel.compiler.api.CompilationException; |
| import org.apache.ode.bpel.compiler.api.CompilerContext; |
| import org.apache.ode.bpel.compiler.api.ExpressionCompiler; |
| import org.apache.ode.bpel.compiler.bom.Expression; |
| import org.apache.ode.bpel.elang.xpath10.o.OXPath10Expression; |
| import org.apache.ode.utils.msg.MessageBundle; |
| import org.jaxen.saxpath.SAXPathException; |
| import org.jaxen.saxpath.XPathReader; |
| import org.jaxen.saxpath.helpers.XPathReaderFactory; |
| import org.w3c.dom.Node; |
| |
| /** |
| * XPath compiler based on the JAXEN implementation. Supports both 2.0 and 1.1 |
| * BPEL. |
| */ |
| public abstract class XPath10ExpressionCompilerImpl implements ExpressionCompiler { |
| |
| private static final XPathMessages __msgs = MessageBundle.getMessages(XPathMessages.class); |
| |
| // private HashMap<String,Function> _extensionFunctions = new |
| // HashMap<String,Function>(); |
| protected CompilerContext _compilerContext; |
| |
| /** Namespace of the BPEL functions (for v2 to v1 compatibility) . */ |
| private String _bpelNsURI; |
| |
| protected QName _qnFnGetVariableData; |
| |
| protected QName _qnFnGetVariableProperty; |
| |
| protected QName _qnFnGetLinkStatus; |
| |
| protected Map<String, String> _properties = new HashMap<String, String>(); |
| |
| /** |
| * Construtor. |
| * |
| * @param bpelNsURI |
| * the BPEL extension function namespace; varies depending on |
| * BPEL version. |
| */ |
| public XPath10ExpressionCompilerImpl(String bpelNsURI) { |
| _bpelNsURI = bpelNsURI; |
| _qnFnGetVariableData = new QName(_bpelNsURI, "getVariableData"); |
| _qnFnGetVariableProperty = new QName(_bpelNsURI, "getVariableProperty"); |
| _qnFnGetLinkStatus = new QName(_bpelNsURI, "getLinkStatus"); |
| _properties.put("runtime-class", "org.apache.ode.bpel.elang.xpath10.runtime.XPath10ExpressionRuntime"); |
| } |
| |
| /** |
| * @see org.apache.ode.bpel.compiler.api.ExpressionCompiler#setCompilerContext(org.apache.ode.bpel.compiler.api.CompilerContext) |
| */ |
| public void setCompilerContext(CompilerContext compilerContext) { |
| _compilerContext = compilerContext; |
| } |
| |
| /** |
| * @see org.apache.ode.bpel.compiler.api.ExpressionCompiler#getProperties() |
| */ |
| public Map<String, String> getProperties() { |
| return _properties; |
| } |
| |
| // Dead code |
| /* |
| * private void registerExtensionFunction(String name, Class function) { try { |
| * Function jaxenFunction = (Function)function.newInstance(); |
| * _extensionFunctions.put(name, jaxenFunction); } catch |
| * (InstantiationException e) { throw new RuntimeException("unexpected error |
| * creating extension function: " + name, e); } catch |
| * (IllegalAccessException e) { throw new RuntimeException("unexpected error |
| * creating extension function: " + name, e); } catch (ClassCastException e) { |
| * throw new RuntimeException("expected extension function of type " + |
| * Function.class.getName()); } } |
| */ |
| |
| /** |
| * Verifies validity of a xpath expression. |
| */ |
| protected void doJaxenCompile(OXPath10Expression out, Expression source) throws CompilationException { |
| String xpathStr; |
| Node node = source.getExpression(); |
| if (node == null) { |
| throw new IllegalStateException("XPath string and xpath node are both null"); |
| } |
| |
| xpathStr = node.getNodeValue(); |
| xpathStr = xpathStr.trim(); |
| if (xpathStr.length() == 0) { |
| throw new CompilationException(__msgs.errXPathSyntax(xpathStr)); |
| } |
| |
| try { |
| XPathReader reader = XPathReaderFactory.createReader(); |
| JaxenBpelHandler handler = new JaxenBpelHandler(_bpelNsURI, out, source.getNamespaceContext(), |
| _compilerContext); |
| reader.setXPathHandler(handler); |
| |
| reader.parse(xpathStr); |
| out.xpath = xpathStr; |
| } catch (CompilationExceptionWrapper e) { |
| CompilationException ce = e.getCompilationException(); |
| if (ce == null) { |
| ce = new CompilationException(__msgs.errUnexpectedCompilationError(e.getMessage()), e); |
| } |
| throw ce; |
| } catch (SAXPathException e) { |
| throw new CompilationException(__msgs.errXPathSyntax(xpathStr)); |
| } |
| } |
| |
| } |