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Warning: This is a facade provided for use by user code, not for implementation in user code.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

        EnvironmentInteraction rootEnvironmentInteraction =
                createRootEnvironmentInteraction(
                        httpRequest, httpResponse);
        envTracker.pushEnvironmentInteraction(rootEnvironmentInteraction);


        final ExpressionContext exprContext =
                pipelineFactory.getExpressionFactory().
                createExpressionContext(envTracker, namespaceTracker);

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     * @return a new pipeline, should not be null.
     */
    private XMLPipeline createPipeline(MarinerRequestContext context) {
        XMLPipelineFactory factory = getPipelineFactory(context);


        ExpressionContext expressionContext =
            MCSExpressionHelper.getExpressionContext(context);


            // create the pipeline configuration. This particular factory will
            // create a configuration based on the MCS config file.
            XMLPipelineConfiguration pipelineConfiguration =

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        ServiceDefinition service =
                ServiceDefinitionHelper.retrieveService(request);


        if (service != null) {
            // we need to store this away in the Expression context
            ExpressionContext expressionContext =
                    environmentContext.getExpressionContext();
            expressionContext.setProperty(ServiceDefinition.class,
                                          service,
                                          false);
        }
    }

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            ExpressionFactory.getDefaultInstance();
        final NamespacePrefixTracker prefixTracker =
            NamespaceFactory.getDefaultInstance().createPrefixTracker();
        prefixTracker.startPrefixMapping("meta-property",
            XDIMESchemata.XDIME2_MCS_NAMESPACE);
        final ExpressionContext expressionContext =
            expressionFactory.createExpressionContext(null, prefixTracker);


        final EnvironmentContextMock environmentContextMock =
            new EnvironmentContextMock("environmentContextMock", expectations);
        environmentContextMock.expects.getExpressionContext()

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                        attributes.getPrecept()));
            }
        }


        if (attributes.getExpr() != null) {
            ExpressionContext expressionContext =
                    ContextInternals.getEnvironmentContext(context).
                            getExpressionContext();


            try {
                expr = expressionContext.getFactory().
                        createExpressionParser().
                        parse(attributes.getExpr()).evaluate(expressionContext);
            } catch (ExpressionException e) {
                throw new PAPIException(e);
            }

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            pipelineInitialization.getPipelineFactory();


        // create the pipeline context
        XMLPipelineContext pipelineContext = null;


       ExpressionContext expressionContext = null;


        // We might already have a valid expression context set up
        expressionContext =
            MCSExpressionHelper.getExpressionContext(requestContext);

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        // the same way as before.
        FormatReference ref = null;
        if (formatRef.startsWith("{") && formatRef.endsWith("}")) {
            stem = formatRef.substring(1, formatRef.length() - 1);
            MarinerRequestContext mrc = pageContext.getRequestContext();
            ExpressionContext ec =
                    MCSExpressionHelper.getExpressionContext(mrc);


            try {
                Expression expr = MCSExpressionHelper.createUnquotedExpression(
                        stem, mrc);

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        ContextInternals.setEnvironmentContext(requestContext,
                environmentContext);


        ExpressionFactory expressionFactory = ExpressionFactory.getDefaultInstance();


        ExpressionContext expressionContext =
                expressionFactory.createExpressionContext(
                        null,
                        NamespaceFactory.getDefaultInstance()
                        .createPrefixTracker());


        expressionContext.setProperty(MarinerRequestContext.class,
                                      requestContext, false);


        RuntimeProject project = new RuntimeProjectMock("runtimeProjectMock",
                expectations);
        volantisBean.setDefaultProject(project);


        final CurrentProjectProviderMock projectProviderMock =
                new CurrentProjectProviderMock("projectProviderMock",
                        expectations);
        projectProviderMock.expects.getCurrentProject().returns(project).any();


        // Add a project provider in for resolving relative policy expressions
        // without a project into absolute IDs containing a project.
        expressionContext.setProperty(CurrentProjectProvider.class,
                projectProviderMock, false);


        environmentContext.setExpressionContext(expressionContext);


        // Initialise the page context.

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        environmentContext.pushEnvironmentInteraction(envTracker);


        // See if an expression context already exists or not; an expression
        // context is shared throughout the lifetime of the request but is
        // lazily instantiated
        ExpressionContext expressionContext =
                MCSExpressionHelper.getExpressionContext(context);


        if (expressionContext == null) {
            // create the expression context, register the functions that are
            // needed and store this expression context away in the page
            // context
            expressionContext =
                    factory.createExpressionContext(
                            envTracker,
                            NamespaceFactory.getDefaultInstance().
                    createPrefixTracker());


            registerFunctions(expressionContext);


            // Store the ExpressionContext in the EnvironmentContext. This
            // allows the expression context to be shared across all
            // sub-requests of a request.


            // The expression context needs to set this property so that expressions
            // work when rendered at runtime.
            expressionContext.setProperty(MarinerRequestContext.class,
                                          context,
                                          false);


            // Allow XPath expressions access to the device
            registerDevicePolicyValueAccessor(expressionContext, devicePolicyValueAccessor);

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        } else if (!state.isMatched() ||
                (state.getPrecept() == Precept.MATCH_EVERY)) {
            // Can continue to see if this when should be evaluated since
            // every precept can be matched or no matches have yet been found
            if (attributes.getExpr() != null) {
                ExpressionContext expressionContext =
                        ContextInternals.getEnvironmentContext(context).
                                getExpressionContext();


                try {
                    // Determine whether the when expression matches that in
                    // the containing select
                    expr = expressionContext.getFactory().
                            createExpressionParser().parse(attributes.getExpr())
                            .
                                    evaluate(expressionContext);


                    if (PipelineExpressionHelper.equals(

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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