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package org.mule.module.xml.transformer; |
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import org.mule.api.lifecycle.InitialisationException; |
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import org.mule.api.transformer.TransformerException; |
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import org.mule.config.i18n.MessageFactory; |
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import org.mule.transformer.AbstractTransformer; |
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import org.mule.transformer.types.DataTypeFactory; |
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import java.util.Arrays; |
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import java.util.Collections; |
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import java.util.Iterator; |
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import java.util.Map; |
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import javax.xml.namespace.NamespaceContext; |
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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.XPathExpressionException; |
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import javax.xml.xpath.XPathFactory; |
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import org.xml.sax.InputSource; |
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public class XPathExtractor extends AbstractTransformer |
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{ |
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|
41 | 0 | public enum ResultType |
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{ |
43 | 0 | NODESET, |
44 | 0 | NODE, |
45 | 0 | STRING, |
46 | 0 | BOOLEAN, |
47 | 0 | NUMBER |
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} |
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50 | 0 | private volatile XPath xpath = XPathFactory.newInstance().newXPath(); |
51 | 0 | private volatile Map<String, String> prefixToNamespaceMap = null; |
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private volatile String expression; |
53 | 0 | private volatile ResultType resultType = ResultType.STRING; |
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public XPathExtractor() |
56 | 0 | { |
57 | 0 | registerSourceType(DataTypeFactory.create(org.w3c.dom.Node.class)); |
58 | 0 | registerSourceType(DataTypeFactory.create(InputSource.class)); |
59 | 0 | } |
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@Override |
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public void initialise() throws InitialisationException |
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{ |
64 | 0 | super.initialise(); |
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66 | 0 | if (expression == null) |
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{ |
68 | 0 | throw new InitialisationException( |
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MessageFactory.createStaticMessage("An expression must be supplied to the StandardXPathExtractor"), |
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this); |
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} |
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73 | 0 | final Map<String, String> prefixToNamespaceMap = this.prefixToNamespaceMap; |
74 | 0 | if (prefixToNamespaceMap != null) |
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{ |
76 | 0 | getXpath().setNamespaceContext(new NamespaceContext() |
77 | 0 | { |
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public String getNamespaceURI(String prefix) |
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{ |
80 | 0 | return prefixToNamespaceMap.get(prefix); |
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} |
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public String getPrefix(String namespaceURI) |
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{ |
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86 | 0 | for (Map.Entry<String, String> entry : prefixToNamespaceMap.entrySet()) |
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{ |
88 | 0 | if (namespaceURI.equals(entry.getValue())) |
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{ |
90 | 0 | return entry.getKey(); |
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} |
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} |
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94 | 0 | return null; |
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} |
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public Iterator getPrefixes(String namespaceURI) |
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{ |
99 | 0 | String prefix = getPrefix(namespaceURI); |
100 | 0 | if (prefix == null) |
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{ |
102 | 0 | return Collections.emptyList().iterator(); |
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} |
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else |
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{ |
106 | 0 | return Arrays.asList(prefix).iterator(); |
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} |
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} |
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}); |
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} |
111 | 0 | } |
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@Override |
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public Object doTransform(Object src, String encoding) throws TransformerException |
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{ |
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QName resultType; |
117 | 0 | switch (getResultType()) |
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{ |
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case BOOLEAN : |
120 | 0 | resultType = XPathConstants.BOOLEAN; |
121 | 0 | break; |
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case NODE : |
123 | 0 | resultType = XPathConstants.NODE; |
124 | 0 | break; |
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case NODESET : |
126 | 0 | resultType = XPathConstants.NODESET; |
127 | 0 | break; |
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case NUMBER : |
129 | 0 | resultType = XPathConstants.NUMBER; |
130 | 0 | break; |
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default : |
132 | 0 | resultType = XPathConstants.STRING; |
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break; |
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} |
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try |
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{ |
138 | 0 | if (src instanceof InputSource) |
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{ |
140 | 0 | return xpath.evaluate(expression, (InputSource) src, resultType); |
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} |
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else |
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{ |
144 | 0 | return xpath.evaluate(expression, src, resultType); |
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} |
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} |
147 | 0 | catch (XPathExpressionException e) |
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{ |
149 | 0 | throw new TransformerException(this, e); |
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} |
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} |
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public String getExpression() |
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{ |
158 | 0 | return expression; |
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} |
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public void setExpression(String expression) |
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{ |
166 | 0 | this.expression = expression; |
167 | 0 | } |
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public ResultType getResultType() |
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{ |
176 | 0 | return resultType; |
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} |
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public void setResultType(ResultType resultType) |
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{ |
186 | 0 | this.resultType = resultType; |
187 | 0 | } |
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public XPath getXpath() |
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{ |
196 | 0 | return xpath; |
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} |
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public void setXpath(XPath xPath) |
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{ |
206 | 0 | this.xpath = xPath; |
207 | 0 | } |
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public Map<String, String> getNamespaces() |
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{ |
216 | 0 | return prefixToNamespaceMap; |
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} |
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public void setNamespaces(Map<String, String> prefixToNamespaceMap) |
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{ |
226 | 0 | this.prefixToNamespaceMap = prefixToNamespaceMap; |
227 | 0 | } |
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} |