Examples of com.volantis.xml.expression.Expression

com.volantis.xml.expression.Expression
A parsed 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Warning: This is a facade provided for use by user code, not for implementation in user code.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.

Implementations of this interface must be thread safe and must not maintain any evaluation specific state as they may be evaluated simultaneously by multiple threads.

Expressions must have no context specific information in them. Where it is necessary to refer to named items the names must be stored as QNames which are expanded at evaluation time. This means that a given string will always result in the same Expression expression no matter where it is used.
@volantis-api-include-in PublicAPI @volantis-api-include-in ProfessionalServicesAPI @volantis-api-include-in InternalAPI

            factory.createSequence(left));
        context.getCurrentScope().declareVariable(
            new ImmutableExpandedName("", "right"),
            factory.createSequence(right));


        Expression exp = compileExpression("$left = (($right))");
        Value result = exp.evaluate(context);      
        assertTrue("Nested variable comparison failed", 
            ((BooleanValue) result).asJavaBoolean());
    }

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        context.getCurrentScope().declareVariable(
                new ImmutableExpandedName("http://myNamespace",
                                          "var"),
                result);


        Expression exp = compileExpression("$p:var");


        assertTrue("Variable expression evaluation failed",
                   exp.evaluate(context) == result);
    }

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    public void testUnqualifiedVariableEvaluate() throws Exception {
        context.getCurrentScope().declareVariable(
                new ImmutableExpandedName("", "myVar"),
                result);


        Expression exp = compileExpression("$myVar");


        assertTrue("Variable expression evaluation failed",
                   exp.evaluate(context) == result);
    }

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     * Ensures that an unqualified variable reference that has not be declared
     * cannot be evaluated
     * @throws Exception if an error occurs
     */
    public void testUnDeclaredVariableEvaluate() throws Exception {
        Expression exp = compileExpression("$myVar");
        try {
            exp.evaluate(context);


            fail("Expected an expression exception");
        } catch (ExpressionException e) {
            // Expected condition
        }

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        context.getCurrentScope().declareVariable(
                new ImmutableExpandedName("", "myVar"),
                factory.createSequence(items));


        Expression exp = compileExpression("$myVar[1]");


        assertTrue("Variable expression evaluation failed",
                   exp.evaluate(context) == items[0]);
    }

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        context.getCurrentScope().declareVariable(
                new ImmutableExpandedName("", "myVar"),
                factory.createSequence(items));


        Expression exp = compileExpression("$myVar[2]");


        assertTrue("Variable expression evaluation failed",
                   exp.evaluate(context) == items[1]);
    }

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        context.getCurrentScope().declareVariable(
                new ImmutableExpandedName("", "myVar"),
                factory.createSequence(items));


        Expression exp = compileExpression("$myVar[3]");


        assertTrue("Variable expression evaluation failed",
                   exp.evaluate(context) == items[2]);
    }

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        context.getCurrentScope().declareVariable(
                new ImmutableExpandedName("", "myVar"),
                factory.createSequence(items));


        Expression exp = compileExpression("$myVar[4]");


        Value result = exp.evaluate(context);


        // result should be an empty sequence
        assertTrue("Result is not a Sequence instance",
                   result instanceof Sequence);

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                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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        context.getCurrentScope().declareVariable(
                new ImmutableExpandedName("", "myVar"),
                factory.createSequence(items));




        Expression exp = compileExpression("$myVar[0]");


        Value result = exp.evaluate(context);


        // result should be an empty sequence
        assertTrue("Result is not a Sequence instance",
                   result instanceof Sequence);

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