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package org.mule.module.xml.expression; |
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import org.mule.api.MuleContext; |
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import org.mule.api.MuleMessage; |
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import org.mule.api.MuleRuntimeException; |
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import org.mule.api.context.MuleContextAware; |
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import org.mule.api.context.notification.MuleContextNotificationListener; |
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import org.mule.api.expression.ExpressionEvaluator; |
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import org.mule.api.lifecycle.Disposable; |
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import org.mule.api.lifecycle.Initialisable; |
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import org.mule.api.lifecycle.InitialisationException; |
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import org.mule.api.registry.RegistrationException; |
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import org.mule.context.notification.MuleContextNotification; |
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import org.mule.module.xml.i18n.XmlMessages; |
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import org.mule.module.xml.stax.MapNamespaceContext; |
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import org.mule.module.xml.util.NamespaceManager; |
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import org.mule.transformer.types.DataTypeFactory; |
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import java.util.Map; |
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import java.util.WeakHashMap; |
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import javax.xml.namespace.QName; |
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import javax.xml.xpath.XPath; |
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import javax.xml.xpath.XPathConstants; |
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import javax.xml.xpath.XPathExpression; |
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import javax.xml.xpath.XPathExpressionException; |
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import javax.xml.xpath.XPathFactory; |
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import org.w3c.dom.Node; |
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49 | 0 | public class JaxpXPathExpressionEvaluator implements ExpressionEvaluator, Initialisable, Disposable, MuleContextAware |
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{ |
51 | 0 | private Map<String, XPathExpression> cache = new WeakHashMap<String, XPathExpression>(8); |
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private MuleContext muleContext; |
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private NamespaceManager namespaceManager; |
55 | 0 | private QName returnType = XPathConstants.STRING; |
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public JaxpXPathExpressionEvaluator() |
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{ |
59 | 0 | super(); |
60 | 0 | } |
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public String getName() |
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{ |
64 | 0 | return "xpath2"; |
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} |
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public void setMuleContext(MuleContext context) |
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{ |
69 | 0 | this.muleContext = context; |
70 | 0 | } |
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public void initialise() throws InitialisationException |
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{ |
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try |
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{ |
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87 | 0 | this.muleContext.registerListener(new MuleContextNotificationListener<MuleContextNotification>(){ |
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public void onNotification(MuleContextNotification notification) |
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{ |
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92 | 0 | if (MuleContextNotification.CONTEXT_STARTING == notification.getAction()) |
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{ |
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try |
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{ |
96 | 0 | namespaceManager = muleContext.getRegistry().lookupObject(NamespaceManager.class); |
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} |
98 | 0 | catch (RegistrationException e) |
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{ |
100 | 0 | throw new RuntimeException(e); |
101 | 0 | } |
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} |
103 | 0 | } |
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}); |
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} |
106 | 0 | catch (Throwable t) |
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{ |
108 | 0 | throw new InitialisationException(t, this); |
109 | 0 | } |
110 | 0 | } |
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public Object evaluate(String expression, MuleMessage message) |
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{ |
117 | 0 | QName retType = returnType; |
118 | 0 | if (expression.startsWith("[")) |
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{ |
120 | 0 | int x = expression.indexOf("]"); |
121 | 0 | if (x == -1) |
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{ |
123 | 0 | throw new IllegalArgumentException("Expression is malformed: " + expression); |
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} |
125 | 0 | String type = expression.substring(1, x); |
126 | 0 | expression = expression.substring(x + 1); |
127 | 0 | if (type.equalsIgnoreCase("boolean")) |
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{ |
129 | 0 | retType = XPathConstants.BOOLEAN; |
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} |
131 | 0 | else if (type.equalsIgnoreCase("string")) |
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{ |
133 | 0 | retType = XPathConstants.STRING; |
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} |
135 | 0 | else if (type.equalsIgnoreCase("node")) |
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{ |
137 | 0 | retType = XPathConstants.NODE; |
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} |
139 | 0 | else if (type.equalsIgnoreCase("nodeset")) |
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{ |
141 | 0 | retType = XPathConstants.NODESET; |
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} |
143 | 0 | else if (type.equalsIgnoreCase("number")) |
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{ |
145 | 0 | retType = XPathConstants.NUMBER; |
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} |
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else |
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{ |
149 | 0 | throw new IllegalArgumentException("Result type not recognised: " + type + ". Use either boolean, string, number, node or nodeset."); |
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} |
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} |
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try |
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{ |
154 | 0 | Node payload = message.getPayload(DataTypeFactory.create(Node.class)); |
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156 | 0 | XPathExpression xpath = getXPath(expression); |
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158 | 0 | return xpath.evaluate(payload, retType); |
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} |
160 | 0 | catch (Exception e) |
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{ |
162 | 0 | throw new MuleRuntimeException(XmlMessages.failedToProcessXPath(expression), e); |
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} |
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} |
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public final void setName(String name) |
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{ |
171 | 0 | throw new UnsupportedOperationException("setName"); |
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} |
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protected XPathExpression getXPath(String expression) throws XPathExpressionException |
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{ |
176 | 0 | String key = expression + getClass().getName(); |
177 | 0 | XPathExpression xpath = cache.get(key); |
178 | 0 | if (xpath == null) |
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{ |
180 | 0 | xpath = createXPath(expression); |
181 | 0 | cache.put(key, xpath); |
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} |
183 | 0 | return xpath; |
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} |
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protected XPathExpression createXPath(String expression) throws XPathExpressionException |
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{ |
188 | 0 | XPath xp = XPathFactory.newInstance().newXPath(); |
189 | 0 | if (getNamespaceManager() != null) |
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{ |
191 | 0 | xp.setNamespaceContext(new MapNamespaceContext(getNamespaceManager().getNamespaces())); |
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} |
193 | 0 | return xp.compile(expression); |
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} |
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public void dispose() |
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{ |
203 | 0 | cache.clear(); |
204 | 0 | } |
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public NamespaceManager getNamespaceManager() |
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{ |
208 | 0 | return namespaceManager; |
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} |
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public void setNamespaceManager(NamespaceManager namespaceManager) |
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{ |
213 | 0 | this.namespaceManager = namespaceManager; |
214 | 0 | } |
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public MuleContext getMuleContext() |
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{ |
218 | 0 | return muleContext; |
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} |
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public QName getReturnType() |
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{ |
223 | 0 | return returnType; |
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} |
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public void setReturnType(QName returnType) |
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{ |
228 | 0 | this.returnType = returnType; |
229 | 0 | } |
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} |
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