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JAXPExtensionsProvider.javaAPI DocJava SE 6 API8219Tue Jun 10 00:23:16 BST 2008com.sun.org.apache.xpath.internal.jaxp

JAXPExtensionsProvider

public class JAXPExtensionsProvider extends Object implements ExtensionsProvider
author
Ramesh Mandava ( ramesh.mandava@sun.com )

Fields Summary
private final XPathFunctionResolver
resolver
private boolean
extensionInvocationDisabled
Constructors Summary
public JAXPExtensionsProvider(XPathFunctionResolver resolver)

	
       
        this.resolver = resolver;
        this.extensionInvocationDisabled = false;
    
public JAXPExtensionsProvider(XPathFunctionResolver resolver, boolean featureSecureProcessing)

        this.resolver = resolver;
        this.extensionInvocationDisabled = featureSecureProcessing;
    
Methods Summary
public booleanelementAvailable(java.lang.String ns, java.lang.String elemName)
Is the extension element available?

        return false;
    
public java.lang.ObjectextFunction(java.lang.String ns, java.lang.String funcName, java.util.Vector argVec, java.lang.Object methodKey)
Execute the extension function.

        try {

            if ( funcName == null ) {
                String fmsg = XSLMessages.createXPATHMessage(
                    XPATHErrorResources.ER_ARG_CANNOT_BE_NULL,
                    new Object[] {"Function Name"} );
                throw new NullPointerException ( fmsg ); 
            }
            //Find the XPathFunction corresponding to namespace and funcName
            javax.xml.namespace.QName myQName = new QName( ns, funcName );

            // JAXP 1.3 spec says When XMLConstants.FEATURE_SECURE_PROCESSING 
            // feature is set then invocation of extension functions need to
            // throw XPathFunctionException
            if ( extensionInvocationDisabled ) {
                String fmsg = XSLMessages.createXPATHMessage(
                    XPATHErrorResources.ER_EXTENSION_FUNCTION_CANNOT_BE_INVOKED,
                    new Object[] { myQName.toString() } );
                throw new XPathFunctionException ( fmsg );
            }

            // Assuming user is passing all the needed parameters ( including
            // default values )
            int arity = argVec.size();

            javax.xml.xpath.XPathFunction xpathFunction = 
                resolver.resolveFunction ( myQName, arity );

            // not using methodKey
            ArrayList argList = new ArrayList( arity);
            for ( int i=0; i<arity; i++ ) {
                Object argument = argVec.elementAt( i );
                // XNodeSet object() returns NodeVector and not NodeList
                // Explicitly getting NodeList by using nodelist()
                if ( argument instanceof XNodeSet ) {
                    argList.add ( i, ((XNodeSet)argument).nodelist() );
                } else if ( argument instanceof XObject ) {
                    Object passedArgument = ((XObject)argument).object();
                    argList.add ( i, passedArgument );
                } else {
                    argList.add ( i, argument );
                }
            }

            return ( xpathFunction.evaluate ( argList ));
        } catch ( XPathFunctionException xfe ) {
            // If we get XPathFunctionException then we want to terminate
            // further execution by throwing WrappedRuntimeException 
            throw new com.sun.org.apache.xml.internal.utils.WrappedRuntimeException ( xfe );
        } catch ( Exception e ) {
            throw new javax.xml.transform.TransformerException ( e );
        }
    
    
public java.lang.ObjectextFunction(com.sun.org.apache.xpath.internal.functions.FuncExtFunction extFunction, java.util.Vector argVec)
Execute the extension function.

        try {
            String namespace = extFunction.getNamespace();
            String functionName = extFunction.getFunctionName();
            int arity = extFunction.getArgCount();
            javax.xml.namespace.QName myQName = 
                new javax.xml.namespace.QName( namespace, functionName );

            // JAXP 1.3 spec says  When XMLConstants.FEATURE_SECURE_PROCESSING
            // feature is set then invocation of extension functions need to
            // throw XPathFunctionException
            if ( extensionInvocationDisabled ) {
                String fmsg = XSLMessages.createXPATHMessage(
                    XPATHErrorResources.ER_EXTENSION_FUNCTION_CANNOT_BE_INVOKED,                    new Object[] { myQName.toString() } );
                throw new XPathFunctionException ( fmsg );
            }

            XPathFunction xpathFunction = 
                resolver.resolveFunction( myQName, arity );

            ArrayList argList = new ArrayList( arity);
            for ( int i=0; i<arity; i++ ) {
                Object argument = argVec.elementAt( i );
                // XNodeSet object() returns NodeVector and not NodeList
                // Explicitly getting NodeList by using nodelist()
                if ( argument instanceof XNodeSet ) {
                    argList.add ( i, ((XNodeSet)argument).nodelist() );
                } else if ( argument instanceof XObject ) {
                    Object passedArgument = ((XObject)argument).object();
                    argList.add ( i, passedArgument );
                } else {
                    argList.add ( i, argument );
                }
            }
       
            return ( xpathFunction.evaluate ( argList ));

        } catch ( XPathFunctionException xfe ) {
            // If we get XPathFunctionException then we want to terminate 
            // further execution by throwing WrappedRuntimeException
            throw new com.sun.org.apache.xml.internal.utils.WrappedRuntimeException ( xfe );
        } catch ( Exception e ) {
            throw new javax.xml.transform.TransformerException ( e );
        }
    
public booleanfunctionAvailable(java.lang.String ns, java.lang.String funcName)
Is the extension function available?

      try {
        if ( funcName == null ) {
            String fmsg = XSLMessages.createXPATHMessage( 
                XPATHErrorResources.ER_ARG_CANNOT_BE_NULL,
                new Object[] {"Function Name"} );
            throw new NullPointerException ( fmsg ); 
        }
        //Find the XPathFunction corresponding to namespace and funcName
        javax.xml.namespace.QName myQName = new QName( ns, funcName );
        javax.xml.xpath.XPathFunction xpathFunction = 
            resolver.resolveFunction ( myQName, 0 );
        if (  xpathFunction == null ) {
            return false;
        }
        return true;
      } catch ( Exception e ) {
        return false;
      }