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Warning: This is a facade provided for use by user code, not for implementation in user code.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(new Item[]
                                    {factory.createStringValue("one"),
                                     factory.createStringValue("two")}));




        Expression exp = compileExpression("concat('con', $seq)");


        try {
            exp.evaluate(context);
            fail("calling concat with a single argument should result " +
                 "in a JXPathException");
        } catch (ExpressionException e) {
            // expected condition
        }

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     * test for the AND operator
     * @throws Exception if an error occurs
     */
    public void testSimpleAndOperator() throws Exception {


        Expression exp = compileExpression("2 = 2 and 3 = 3");


        Value result = exp.evaluate(context);


        assertTrue("AND expression should result in a boolean value",
                   result instanceof BooleanValue);


        assertTrue("AND expression result should be true",

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        context.getCurrentScope().declareVariable(
                new ImmutableExpandedName("", "myVar"),
                one);




        Expression exp = compileExpression("$myVar <= 1 and 4 > $myVar");


        Value result = exp.evaluate(context);


        assertTrue("AND expression should result in a boolean value",
                   result instanceof BooleanValue);


        assertTrue("AND expression result should be true",

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     * test for the OR operator
     * @throws Exception if an error occurs
     */
    public void testSimpleOrOperator() throws Exception {


        Expression exp = compileExpression("2 = 3 or 3 = 3");


        Value result = exp.evaluate(context);


        assertTrue("OR expression should result in a boolean value",
                   result instanceof BooleanValue);


        assertTrue("OR expression result should be true",

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        context.getCurrentScope().declareVariable(
                new ImmutableExpandedName("", "myVar"),
                one);




        Expression exp = compileExpression("$myVar <= 1 or 0 > $myVar");


        Value result = exp.evaluate(context);


        assertTrue("OR expression should result in a boolean value",
                   result instanceof BooleanValue);


        assertTrue("OR expression result should be true",

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


        Expression exp = compileExpression("$myVar != \"" +
                                           result.stringValue().
                                           asJavaString() + "\"");
        Value result = exp.evaluate(context);


        assertTrue("Inequality expression should result in a boolean value",
                   result instanceof BooleanValue);
        assertFalse("Inequality expression result should be false",
                    ((BooleanValue) result).asJavaBoolean());

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                      }
                    }                    
                });


        Expression exp = compileExpression("function:test(((\"a\"),\"b\"), " 
                          + "(\"c\",\"d\"), \"e\")");


        Value eval = exp.evaluate(context);
        
        assertTrue("Expression should result in a string value",
                   eval instanceof StringValue);


        assertEquals("Expression result not as",

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                        return factory.createStringValue(buffer.toString());
                    }
                });


        // Literal numbers are promoted to double values, not ints
        Expression exp = compileExpression("function:test('a', 2, $myVar)");


        Value eval = exp.evaluate(context);


        assertTrue("Expression should result in a string value",
                   eval instanceof StringValue);


        assertEquals("Expression result not as",

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                        throw new ExpressionException();
                    }
                });


        // Compile and execute the function
        Expression exp = compileExpression("function:test()");


        try {
            Value eval = exp.evaluate(context);
            fail("Function should have thrown ExpressionException, but " +
                    "no exception thrown.");
        } catch (ExpressionException ee) {
            // Expected result - test successful
        }

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     * @throws Exception if an error occurs
     */
    public void testInvokeNonExistentFunction() throws Exception {


        // pasre the expression
        Expression exp = compileExpression("undeclaredFuntion()");


        try {
            // try to evaluate the expression. The function has not been
            // registered with the context so we expect a ExpressionException
            // to be thrown.
            exp.evaluate(context);
            fail("Evaluating a non existent function should result in an " +
                 "ExpressionException");
        } catch (ExpressionException e) {
            // expected
        }

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