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Warning: This is a facade provided for use by user code, not for implementation in user code.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


    // javadoc inherited
    public void startProcess() throws SAXException {


        // declare the variabe in the current ExpressionContext.
        ExpressionContext expressionContext
                = getPipelineContext().getExpressionContext();


        // The given name could be a prefixed name, so go through these hoops
        // to ensure that we register the variable against the correct
        // namespace (the namespace for no prefix is "no namespace" according
        // to http://www.w3.org/TR/xpath20/#id-variables - this is modelled
        // using the "default namespace" for variables)
        expressionContext.getCurrentScope().declareVariable(
            expressionContext.getNamespacePrefixTracker().
            resolveQName(new ImmutableQName(variableName), ""),
            expressionContext.getFactory().
            createStringValue(variableValue));
    }

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    }


    // javadoc inherited
    public void startProcess() throws SAXException {
        // declare a variable scope
        ExpressionContext context = 
                getPipelineContext().getExpressionContext();
        context.pushStackFrame();
    }

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    }


    // javadoc inherited
    public void stopProcess() throws SAXException {
        // undeclare a variable scope
        ExpressionContext context = 
                getPipelineContext().getExpressionContext();
        context.popStackFrame();
    }

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        ProtocolBuilder builder = new ProtocolBuilder();
        DOMProtocol protocol = (DOMProtocol) builder.build(
                new TestProtocolRegistry.TestDOMProtocolFactory(),
                InternalDeviceTestHelper.createTestDevice());


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


        ContextInternals.setEnvironmentContext(requestContext, environmentContext);
        ContextInternals.setMarinerPageContext(requestContext, pageContext);
        MCSExpressionHelper.setExpressionContext(requestContext, expressionContext);


        pageContext.pushRequestContext(requestContext);
        pageContext.setProtocol(protocol);


        ExpressionSupport.registerFunctions(expressionContext);
        expressionContext.setProperty(MarinerRequestContext.class,
                                      requestContext,
                                      true);


        protocol.setMarinerPageContext(pageContext);

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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);


        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);
        return requestContext;
    }

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    public void testParameters() throws Exception {
        ExpressionFactory factory = new JXPathExpressionFactory();
        TestFunction testFunction = new TestFunction(factory);
        // @todo later fix parameters
        ExpressionContext context = factory.createExpressionContext(null, null);
        JXPathExpressionFunctionAdapter adapter =
                new JXPathExpressionFunctionAdapter(factory,
                                                    testFunction,
                                                    context);
        Item[] items = {factory.createIntValue(1),

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                pipelineFactory.createPipelineContext(
                        createPipelineConfiguration(),
                        createRootEnvironmentInteraction());


        // extract the expression context
        ExpressionContext expressionContext
                = pipelineContext.getExpressionContext();


        // allow subclasses to register functions that are specific to
        // their tests
        registerExpressionFunctions(expressionContext);

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        // create the actual parser
        XMLReader parser = XMLReaderFactory.createXMLReader(false);


        // extract the expression context
        ExpressionContext expresisonContext
                = context.getExpressionContext();


        // allow subclasses to register functions that are specific to
        // their tests
        registerExpressionFunctions(expresisonContext);

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        // Create an expression context for the environment context.
        final ExpressionFactory factory = ExpressionFactory.getDefaultInstance();
        final EnvironmentInteractionTracker simpleTracker =
                new SimpleEnvironmentInteractionTracker();
        final ExpressionContext exprContext = factory.
                createExpressionContext(simpleTracker,
                        new DefaultNamespacePrefixTracker());


        // Associate the expression context with the environment context.
        envContext.setExpressionContext(exprContext);

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        // Get the initial environment and expression contexts from the page
        // context.
        final TestEnvironmentContext initialEnvContext =
                (TestEnvironmentContext) pageContext.getEnvironmentContext();
        final ExpressionContext initialExprContext =
                initialEnvContext.getExpressionContext();


        // Retrieve the initial MarinerRequestContext.
        final MarinerRequestContext initialRequestContext =
                pageContext.getRequestContext();


        assertSame("Expression context should be copied to first nested " +
                "context",
                initialRequestContext.getEnvironmentContext().
                getExpressionContext(),
                initialExprContext);


        // Initially, the  expression context is associated with the page
        // context's request context.
        assertSame("MRC class property should be the same for the page " +
                "context's request context",
                initialExprContext.getProperty(MarinerRequestContext.class),
                initialRequestContext);


        // Create the first nested context.
        MarinerRequestContext nestedContext1 =
                initialRequestContext.createNestedContext();


        // Test that the initial expression context has been copied to the
        // first nested context.
        assertSame("Expression context should be copied to first nested " +
                "context",
                nestedContext1.getEnvironmentContext().getExpressionContext(),
                initialExprContext);


        // The expression context is now associated with the
        // MarinerServletRequestContext.
        assertSame("MRC class property should be the same on first nested " +
                "context",
                initialExprContext.getProperty(MarinerRequestContext.class),
                nestedContext1);


        // Create the second nested context.
        MarinerRequestContext nestedContext2 =
                nestedContext1.createNestedContext();


        // Test that the initial expression context has been copied to the
        // second nested context.
        assertSame("Expression context should be copied to second nested " +
                "context",
                nestedContext2.getEnvironmentContext().getExpressionContext(),
                initialExprContext);


        // The expression context is now associated with the second nested
        // context.
        assertSame("MRC class property should be the same on second nested " +
                "context",
                initialExprContext.getProperty(MarinerRequestContext.class),
                nestedContext2);


        // Clean up the context's resources; in particular the expression
        // context should be "reset".
        nestedContext2.release();


        // After releasing, the expression context should now be re-associated
        // with the first nested context.
        assertSame("MRC class property should be the same on first nested " +
                "context after second nested context release",
                initialExprContext.getProperty(MarinerRequestContext.class),
                nestedContext1);


        // Clean up the context's resources; in particular the expression
        // context should be "reset".
        nestedContext1.release();


        // After releasing, the expression context should now be re-associated
        // with the internal request context.
        assertSame("MRC class property should be the same on " +
                "MarinerServletRequestContext after first nested release",
                initialExprContext.getProperty(MarinerRequestContext.class),
                initialRequestContext);
    }

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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