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1
61
62 package org.jaxen.function.ext;
63
64 import java.util.Collections  ;
65 import java.util.List ;
66
67 import org.jaxen.Context;
68 import org.jaxen.ContextSupport;
69 import org.jaxen.Function;
70 import org.jaxen.FunctionCallException;
71 import org.jaxen.Navigator;
72 import org.jaxen.XPath;
73 import org.jaxen.function.StringFunction;
74
75
80 public class EvaluateFunction implements Function
81 {
82 public Object call( Context context, List args )
83 throws FunctionCallException
84 {
85 if ( args.size() == 1 ) {
86 return evaluate( context, args.get(0));
87 }
88
89 throw new FunctionCallException( "evaluate() requires one argument" );
90 }
91
92 public static List evaluate (Context context, Object arg)
93 throws FunctionCallException
94 {
95 List contextNodes = context.getNodeSet();
96
97 if (contextNodes.size() == 0)
98 return Collections.EMPTY_LIST;
99
100 Navigator nav = context.getNavigator();
101
102 String xpathString;
103 if ( arg instanceof String )
104 xpathString = (String )arg;
105 else
106 xpathString = StringFunction.evaluate(arg, nav);
107
108 try {
109 XPath xpath = nav.parseXPath(xpathString);
110 ContextSupport support = context.getContextSupport();
111 xpath.setVariableContext( support.getVariableContext() );
112 xpath.setFunctionContext( support.getFunctionContext() );
113 xpath.setNamespaceContext( support.getNamespaceContext() );
114 return xpath.selectNodes( context.duplicate() );
115 }
116 catch ( org.jaxen.saxpath.SAXPathException e ) {
117 throw new FunctionCallException(e.toString());
118 }
119 }
120 }
121
122 |
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