Examples of com.volantis.xml.expression.ExpressionFactory

com.volantis.xml.expression.ExpressionFactory
A class for creating expression specific objects.
Note: it is not possible to pass a null value to the overloaded {@link #createSequence} functions without an explicitcast. However, it is better to use {@link Sequence.EMPTY} to obtain anempty sequence. The same issue exists for the methods {@link #createDateTimeValue}, {@link #createDateValue} and {@link #createTimeValue}.

Warning: This is a facade provided for use by user code, not for implementation in user code.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.
@volantis-api-include-in PublicAPI @volantis-api-include-in ProfessionalServicesAPI @volantis-api-include-in InternalAPI @mock.generate

     * 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,
                new Value[]{sequence, pattern});


        final Sequence retSeq = retVal.getSequence();

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     * 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,
                new Value[]{sequence, pattern});


        final Sequence retSeq = retVal.getSequence();

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     * '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,
                new Value[]{sequence, pattern});


        final Sequence retSeq = retVal.getSequence();

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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,
                    new Value[]{sequence, pattern, pattern});
            fail("Should have failed when invoked with three arguments");
        } catch (ExpressionException expected) {

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    public static boolean evaluateExpression(
            XMLPipelineContext pipelineContext,
            String expressionString)
            throws ExpressionException {


        ExpressionFactory expressionFactory =
                ExpressionFactory.getDefaultInstance();


        ExpressionContext expressionContext =
                pipelineContext.getExpressionContext();


        Expression expression =
                expressionFactory.createExpressionParser().parse(
                    expressionString);
        Value result = expression.evaluate(expressionContext);
        return PipelineExpressionHelper.fnBoolean(result.getSequence())
                .asJavaBoolean();
    }

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public class ErrorCodeNameFunction extends AbstractErrorFunction {


    public Value invoke(ExpressionContext context, Value[] arguments) throws ExpressionException {
        assertArgumentCount(arguments, 0);
        SAXParseException x = getException(context);
        ExpressionFactory factory = context.getFactory();
        Value result = Sequence.EMPTY;


        if (x instanceof XMLPipelineException) {
            XMLPipelineException pipelineException = (XMLPipelineException) x;
            String codeName = pipelineException.getErrorCodeName();
            if (codeName != null) {
                result = factory.createStringValue(codeName);
            }
        }


        return result;
    }

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public class ErrorMessageFunction extends AbstractErrorFunction {


    public Value invoke(ExpressionContext context, Value[] arguments) throws ExpressionException {
        assertArgumentCount(arguments, 0);
        SAXParseException x = getException(context);
        ExpressionFactory factory = context.getFactory();
        Value result = Sequence.EMPTY;


        if (x != null) {
            result = factory.createStringValue(x.getMessage());            
        }


        return result;
    }

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        String expr = attributes.getValue("expr");
        if (expr == null) {
            forwardError(dynamicProcess,
                    "'expr' attribute must be specified on " + element);
        } else {
            ExpressionFactory factory = ExpressionFactory.getDefaultInstance();
            ExpressionParser parser = factory.createExpressionParser();
            try {
                // Parse, and evaluate the expression.
                Expression expression = parser.parse(expr);
                Value value = expression.evaluate(context);

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                = new DynamicRuleProcess(this, configuration);


        // initalize the parser that will be use to parse XPath expressions
        XMLPipelineFactory pipelineFactory =
                getPipelineContext().getPipelineFactory();
        ExpressionFactory expressionFactory =
                pipelineFactory.getExpressionFactory();
        ExpressionParser parser = expressionFactory.createExpressionParser();


        // create a process that can evaluate expressions
        ExpressionProcess expressionProcess = createExpressionProcess(parser);


        DISelectConditionalProcess diSelectProcess = new DISelectConditionalProcess(parser);

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