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Warning: This is a facade provided for use by user code, not for implementation in user code.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


    /**
     * Tests that the search string is not found.
     */
    public void testSearchNotPresent() 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("cat");
        Value retVal = indexOf.invoke(context, new Value[]{sequence, search});

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    /**
     * Tests that the search string is found at all positions.
     */
    public void testAllItemsMatch() throws Exception {
        ExpressionContext context = createExpressionContext();
        ExpressionFactory factory = context.getFactory();
        Function indexOf = new IndexOfFunction();
        Sequence sequence = createStringSequence(factory,
                new String[]{"abc", "abc", "abc", "abc", "abc"});
        Value search = factory.createStringValue("abc");
        Value retVal = indexOf.invoke(context, new Value[]{sequence, search});

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    /**
     * Tests that an empty search string causes the empty sequence to be
     * returned.
     */
    public void testEmptySearch() throws Exception {
        ExpressionContext context = createExpressionContext();
        ExpressionFactory factory = context.getFactory();
        Function indexOf = new IndexOfFunction();
        Sequence sequence = createStringSequence(factory,
                new String[]{"abc", "abc", "abc", "abc", "abc"});
        Value search = factory.createStringValue("");
        Value retVal = indexOf.invoke(context, new Value[]{sequence, search});

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    /**
     * Tests that an empty sequence causes the empty sequence to be
     * returned.
     */
    public void testEmptySequence() throws Exception {
        ExpressionContext context = createExpressionContext();
        ExpressionFactory factory = context.getFactory();
        Function indexOf = new IndexOfFunction();
        Sequence sequence = createStringSequence(factory, null);
        Value search = factory.createStringValue("peter");
        Value retVal = indexOf.invoke(context, new Value[]{sequence, search});

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    /**
     * Tests that an empty sequence and empty search string causes the empty
     * sequence to be returned.
     */
    public void testEmptySequenceEmptySearch() throws Exception {
        ExpressionContext context = createExpressionContext();
        ExpressionFactory factory = context.getFactory();
        Function indexOf = new IndexOfFunction();
        Sequence sequence = createStringSequence(factory, null);
        Value search = factory.createStringValue("");
        Value retVal = indexOf.invoke(context, new Value[]{sequence, search});

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    /**
     * Tests that the search integer is found where expected.
     * ((15, 40, 25, 40, 10), 40)
     */
    public void testIntegerSequence() throws Exception {
        ExpressionContext context = createExpressionContext();
        ExpressionFactory factory = context.getFactory();
        Function indexOf = new IndexOfFunction();
        Sequence sequence = createIntegerSequence(factory,
                new int[]{15, 40, 25, 40, 10});
        Value search = factory.createIntValue(40);
        Value retVal = indexOf.invoke(context, new Value[]{sequence, search});

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     */
    private ExpressionContext createExpressionContext() {
        EnvironmentInteractionTracker eit =
                new SimpleEnvironmentInteractionTracker();
        NamespacePrefixTracker npt = new DefaultNamespacePrefixTracker();
        ExpressionContext context = ExpressionFactory.getDefaultInstance().
                createExpressionContext(eit, npt);
        return context;
    }

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


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


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

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        // get hold of an ExpressionFactory
        ExpressionFactory expressionFactory =
                pipelineFactory.getExpressionFactory();
        
        // create an expression context
        ExpressionContext expressionContext = 
                expressionFactory .createExpressionContext(null, null);        
        
        // return a context 
        return factory.createPipelineContext(config, expressionContext);
    }

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    public void testSecondCreatePipelineContext() throws Exception {
        // create a config
        XMLPipelineConfiguration config = 
                factory.createPipelineConfiguration();
        
        ExpressionContext expressionContext = 
                factory.getExpressionFactory().createExpressionContext(
                        null, null);        
        
        // factor a context
        XMLPipelineContext context =

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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