Examples of com.volantis.xml.expression.ExpressionContext

com.volantis.xml.expression.ExpressionContext
Encapsulates all the information needed to execute an expression.
Warning: This is a facade provided for use by user code, not for implementation in user code. User implementations of this interface are highly likely to be incompatible with future releases of the product at both binary and source levels.

Current Scope

Initially when the expression context is first created the current scope is the global scope. The global scope is visible from all other scopes within the expression context and so global variables can be accessed from all scopes unless they have been hidden by a variable with the same name in a closer enclosing scope.

Stack Frames

A stack frame is used to hold a set of variables that are independent of variables used within other stack frames. Each stack frame consists of a new scope in which variables can be declared. This scope is connected to the global scope associated with the environment expression but is not connected to scopes from the enclosing stack frame.

Namespace Resolving

It is often necessary within an expression to resolve a prefix name to an expanded name. e.g. variable references typically use {@link com.volantis.xml.namespace.QName}s to refer to variables rather than expanded names. Therefore, when an expression context is created it is given with a namespace prefix resolver to use. It is the responsibility of some external mechanism to ensure that the mappings held by that resolver are update properly.

Custom Properties

See {@link PropertyContainer} for more details.
@volantis-api-include-in PublicAPI @volantis-api-include-in ProfessionalServicesAPI @volantis-api-include-in InternalAPI @mock.generate

     * @throws Exception if an  error is encountered
     */
    public void testCreateContext() throws Exception {
        // ensure the correct object is created
        // @todo fix parameters
        ExpressionContext context = factory.createExpressionContext(null, null);
        assertTrue("JXPathExpressionFactory createContext() should create " +
                   "JXPathExpressionContext instance", 
                   (context instanceof JXPathExpressionContext));
    }

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                    Expression expression = parser.parse(expressionStr);
                    // obtain the ExpressionContext from the PipelineContext
                    // the ExpressionContext is needed in order to evaluate the
                    // expression parsed
                    ExpressionContext expressionContext =
                            getPipelineContext().getExpressionContext();


                    // evaluate the experssion
                    Value result = expression.evaluate(expressionContext);
                    if (result.getSequence().getLength() == 0) {

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                               final ExpandedName element,
                               final Attributes attributes) throws SAXException {


        // create a new stack frame and execute the pending variable
        // declarations 
        final ExpressionContext expressionContext =
            dynamicProcess.getPipelineContext().getExpressionContext();
        expressionContext.pushStackFrame();
        final TemplateModel model = getModel(dynamicProcess);
        model.executePendingVariableDeclarations();
        return super.startElement(dynamicProcess, element, attributes);
    }

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    protected void endElementImpl(final DynamicProcess dynamicProcess,
                                  final ExpandedName element,
                                  final Object object) throws SAXException {
        super.endElementImpl(dynamicProcess, element, object);
        // remove the stack frame created for the body of the template
        final ExpressionContext expressionContext =
            dynamicProcess.getPipelineContext().getExpressionContext();
        expressionContext.popStackFrame();
    }

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                                         InternalResponse response,
                                         EnvironmentContext context)
            throws IOException, MarinerContextException {


        MarinerSessionContext sessionContext = null;
        ExpressionContext expressionContext = null;
        if (context != null) {
            sessionContext = context.getCurrentSessionContext();
            expressionContext = context.getExpressionContext();
        }
        try {

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            // MarinerPageContext has been allocated but before it has been
            // initialised as this is needed during the initialisation.
            environmentContext.initialise(context);
            environmentContext.initialiseSession();


            ExpressionContext exprContext =
                    environmentContext.getExpressionContext();


            // If there is an expression context then it must have been associated
            // with an enclosing request context since we are still initialising
            // this instance of MarinerServletRequestContext. We now must associate
            // the expression context with this MarinerServletRequestContext.
            //
            // An expression context can be associated with more than one request
            // context, although not concurrently. When the request context is no
            // longer needed, the expression context (if any) should be reset to
            // the enclosing request context.
            if (exprContext == null) {
                ExpressionSupport.createExpressionEnv(this,
                        volantisBean, environmentContext,
                        context.getDevicePolicyAccessor());
            } else {
                exprContext.setProperty(MarinerRequestContext.class, this,
                        false);
            }


            ContextInternals.setEnvironmentContext(this, environmentContext);

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            }


            // If there is an expression context associated with this request
            // context then it must be reset so that it is re-associated with the
            // enclosing request context from which it originally came.
            ExpressionContext exprContext =
                    MCSExpressionHelper.getExpressionContext(this);
            if (exprContext != null) {
                exprContext.
                        setProperty(MarinerRequestContext.class,
                                enclosingRequestContext,
                                false);
            }

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            // MarinerPageContext has been allocated but before it has been
            // initialised as this is needed during the initialisation.
            environmentContext.initialise(context);
            environmentContext.initialiseSession();


            ExpressionContext exprContext =
                    environmentContext.getExpressionContext();


            // If there is an expression context then it must have been associated
            // with an enclosing request context since we are still initialising
            // this instance of MarinerServletRequestContext. We now must associate
            // the expression context with this MarinerServletRequestContext.
            //
            // An expression context can be associated with more than one request
            // context, although not concurrently. When the request context is no
            // longer needed, the expression context (if any) should be reset to
            // the enclosing request context.
            if (exprContext == null) {
                ExpressionSupport.createExpressionEnv(this,
                        volantisBean, environmentContext,
                        context.getDevicePolicyAccessor());
            } else {
                exprContext.setProperty(MarinerRequestContext.class, this,
                        false);
            }


            ContextInternals.setEnvironmentContext(this, environmentContext);

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            }


            // If there is an expression context associated with this request
            // context then it must be reset so that it is re-associated with the
            // enclosing request context from which it originally came.
            ExpressionContext exprContext =
                    MCSExpressionHelper.getExpressionContext(this);
            if (exprContext != null) {
                exprContext.
                        setProperty(MarinerRequestContext.class,
                                enclosingRequestContext,
                                false);
            }

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    /**
     * Tests that the search string is found where expected.
     */
    public void testSearchPresent() throws Exception {
        ExpressionContext context = createExpressionContext();
        ExpressionFactory factory = context.getFactory();
        Function indexOf = new IndexOfFunction();
        Sequence sequence = createStringSequence(factory,
                new String[]{"a", "dog", "and", "a", "duck"});
        Value search = factory.createStringValue("a");
        Value retVal = indexOf.invoke(context, new Value[]{sequence, search});

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Related Classes of com.volantis.xml.expression.ExpressionContext

com.volantis.mcs.context.MarinerPageContext

com.volantis.mcs.context.MarinerRequestContextTestAbstract

com.volantis.mcs.expression.ExpressionSupport

com.volantis.mcs.expression.MCSExpressionHelper

com.volantis.mcs.internal.MarinerInternalRequestContext

com.volantis.mcs.marlin.sax.MarlinSAXHelper

com.volantis.mcs.papi.impl.SelectElementImpl

com.volantis.mcs.papi.impl.WhenElementImpl

com.volantis.mcs.papi.impl.XFFormFieldElementImplTestAbstract

com.volantis.mcs.protocols.ProtocolTestAbstract

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Examples of com.volantis.xml.expression.ExpressionContext

Current Scope

Stack Frames

Namespace Resolving

Custom Properties

Related Classes of com.volantis.xml.expression.ExpressionContext