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Warning: This is a facade provided for use by user code, not for implementation in user code.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 a 'comma x' pattern.
     */
    public void testCommaPattern() throws Exception {
        ExpressionContext context = createExpressionContext();
        ExpressionFactory factory = context.getFactory();
        Function tokenize = new TokenizeFunction();
        Sequence sequence = createSequence(factory,
                new String[]{"thexcat,x,xxxsatxxxxon,thexxxxxmat"});
        Value pattern = factory.createStringValue(",x");
        Value retVal = tokenize.invoke(context,

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    public Object startElement(
            DynamicProcess dynamicProcess, ExpandedName element,
            Attributes attributes) throws SAXException {


        XMLPipelineContext pipelineContext = dynamicProcess.getPipelineContext();
        ExpressionContext context = pipelineContext.getExpressionContext();


        // Get the expr attribute.
        String expr = attributes.getValue("expr");
        if (expr == null) {
            forwardError(dynamicProcess,

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    /**
     * Tests when input matches pattern, a sequence with an empty string
     * results.
     */
    public void testStringEqualsPattern() throws Exception {
        ExpressionContext context = createExpressionContext();
        ExpressionFactory factory = context.getFactory();
        Function tokenize = new TokenizeFunction();
        Sequence sequence = createSequence(factory,
                new String[]{"one big long missspelt sentence"});
        Value pattern =
                factory.createStringValue("one big long missspelt sentence");

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     * Tests when input equals multiple occurrences of pattern that a sequence
     * of empty strings (one for each match, plus one extra) results.
     */
    public void testStringEqualsMultipleSingleLetterPattern()
            throws Exception {
        ExpressionContext context = createExpressionContext();
        ExpressionFactory factory = context.getFactory();
        Function tokenize = new TokenizeFunction();
        Sequence sequence = createSequence(factory,
                new String[]{"xxxxxxxxxx"});
        Value pattern = factory.createStringValue("x");
        Value retVal = tokenize.invoke(context,

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     * Tests when input equals multiple occurrences of pattern that a sequence
     * of empty strings (one for each match, plus one extra) results.
     */
    public void testStringEqualsMultipleMultipleLetterPattern()
            throws Exception {
        ExpressionContext context = createExpressionContext();
        ExpressionFactory factory = context.getFactory();
        Function tokenize = new TokenizeFunction();
        Sequence sequence = createSequence(factory,
                new String[]{"abcabcabcabcabcabcabcabcabcabc"});
        Value pattern = factory.createStringValue("abc");
        Value retVal = tokenize.invoke(context,

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     * Tests when input is a multiple concatenation of pattern with a
     * 'leftover', that each match generates an empty string and the last
     * sequence member is the leftover bit.
     */
    public void testRemainderX() throws Exception {
        ExpressionContext context = createExpressionContext();
        ExpressionFactory factory = context.getFactory();
        Function tokenize = new TokenizeFunction();
        Sequence sequence = createSequence(factory,
                new String[]{"xxxxxxxxxx"});
        Value pattern = factory.createStringValue("xxx");
        Value retVal = tokenize.invoke(context,

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    /**
     * Tests that failure occurs when function is given no arguments.
     */
    public void testNoArguments() throws Exception {
        try {
            ExpressionContext context = createExpressionContext();
            Function tokenize = new TokenizeFunction();
            Value retVal = tokenize.invoke(context, new Value[]{});
            fail("Should have failed when invoked with no arguments");
        } catch (ExpressionException expected) {
        }

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    /**
     * Tests that failure occurs when function is given one argument.
     */
    public void testOneArgument() throws Exception {
        try {
            ExpressionContext context = createExpressionContext();
            ExpressionFactory factory = context.getFactory();
            Sequence sequence = createSequence(factory,
                    new String[]{"xxxxxxxxxx"});
            Function tokenize = new TokenizeFunction();
            Value retVal = tokenize.invoke(context, new Value[]{sequence});
            fail("Should have failed when invoked with only one argument");

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    /**
     * Tests that failure occurs when function is given three arguments.
     */
    public void testThreeArguments() throws Exception {
        try {
            ExpressionContext context = createExpressionContext();
            ExpressionFactory factory = context.getFactory();
            Sequence sequence = createSequence(factory,
                    new String[]{"xxxxxxxxxx"});
            Value pattern = factory.createStringValue("xxx");
            Function tokenize = new TokenizeFunction();
            Value retVal = tokenize.invoke(context,

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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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Examples of com.volantis.xml.expression.ExpressionContext

Current Scope

Stack Frames

Namespace Resolving

Custom Properties

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