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1
17 package org.apache.servicemix.expression;
18
19 import org.apache.servicemix.jbi.jaxp.SourceTransformer;
20 import org.springframework.beans.factory.InitializingBean;
21 import org.xml.sax.SAXException  ;
22
23 import javax.jbi.messaging.MessageExchange;
24 import javax.jbi.messaging.MessagingException;
25 import javax.jbi.messaging.NormalizedMessage;
26 import javax.xml.namespace.NamespaceContext ;
27 import javax.xml.parsers.ParserConfigurationException ;
28 import javax.xml.transform.TransformerException ;
29 import javax.xml.xpath.XPath ;
30 import javax.xml.xpath.XPathException ;
31 import javax.xml.xpath.XPathExpression ;
32 import javax.xml.xpath.XPathExpressionException ;
33 import javax.xml.xpath.XPathFactory ;
34 import javax.xml.xpath.XPathFunctionResolver ;
35
36 import java.io.IOException ;
37
38
43 public class JAXPXPathExpression implements Expression, InitializingBean {
44 private String xpath;
45 private SourceTransformer transformer = new SourceTransformer();
46 private MessageVariableResolver variableResolver = new MessageVariableResolver();
47 private XPathExpression xPathExpression;
48 private XPathFunctionResolver functionResolver;
49 private NamespaceContext namespaceContext;
50 private XPathFactory factory;
51
52 public JAXPXPathExpression() {
53 }
54
55
58 public JAXPXPathExpression(String xpath) throws Exception {
59 this.xpath = xpath;
60 }
61
62
65 public void afterPropertiesSet() throws XPathExpressionException {
66 if (xPathExpression == null) {
67 if (xpath == null) {
68 throw new IllegalArgumentException ("You must specify the xpath property");
69 }
70
71 if (factory == null) {
72 factory = XPathFactory.newInstance();
73 }
74 XPath xpathObject = factory.newXPath();
75 xpathObject.setXPathVariableResolver(variableResolver);
76 if (functionResolver != null) {
77 xpathObject.setXPathFunctionResolver(functionResolver);
78 }
79 if (namespaceContext != null) {
80 xpathObject.setNamespaceContext(namespaceContext);
81 }
82 xPathExpression = xpathObject.compile(xpath);
83 }
84 }
85
86
90 public Object evaluate(MessageExchange exchange, NormalizedMessage message) throws MessagingException {
91 try {
92 afterPropertiesSet();
93 Object object = getXMLNode(exchange, message);
94 synchronized (this) {
95 variableResolver.setExchange(exchange);
96 variableResolver.setMessage(message);
97 return evaluateXPath(object);
98 }
99 }
100 catch (TransformerException e) {
101 throw new MessagingException(e);
102 }
103 catch (XPathExpressionException e) {
104 throw new MessagingException(e);
105 }
106 catch (ParserConfigurationException e) {
107 throw new MessagingException(e);
108 }
109 catch (IOException e) {
110 throw new MessagingException(e);
111 }
112 catch (SAXException e) {
113 throw new MessagingException(e);
114 }
115 }
116
117 public String getXPath() {
120 return xpath;
121 }
122
123 public void setXPath(String xpath) {
124 this.xpath = xpath;
125 }
126
127 public SourceTransformer getTransformer() {
128 return transformer;
129 }
130
131 public void setTransformer(SourceTransformer transformer) {
132 this.transformer = transformer;
133 }
134
135 public MessageVariableResolver getVariableResolver() {
136 return variableResolver;
137 }
138
139 public void setVariableResolver(MessageVariableResolver variableResolver) {
140 this.variableResolver = variableResolver;
141 }
142
143 public XPathFactory getFactory() {
144 return factory;
145 }
146
147 public void setFactory(XPathFactory factory) {
148 this.factory = factory;
149 }
150
151 public XPathFunctionResolver getFunctionResolver() {
152 return functionResolver;
153 }
154
155 public void setFunctionResolver(XPathFunctionResolver functionResolver) {
156 this.functionResolver = functionResolver;
157 }
158
159 public NamespaceContext getNamespaceContext() {
160 return namespaceContext;
161 }
162
163 public void setNamespaceContext(NamespaceContext namespaceContext) {
164 this.namespaceContext = namespaceContext;
165 }
166
167 protected Object evaluateXPath(Object object) throws XPathExpressionException {
170 return xPathExpression.evaluate(object);
171 }
172
173 protected XPathExpression getXPathExpression() {
174 return xPathExpression;
175 }
176
177 protected Object getXMLNode(MessageExchange exchange, NormalizedMessage message) throws TransformerException , MessagingException, ParserConfigurationException , IOException , SAXException {
178 return transformer.toDOMNode(message);
179 }
180 }
181 |
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