Examples of org.apache.cayenne.exp.Expression.evaluate()

org.apache.cayenne.exp.Expression.evaluate()
Calculates expression value with object as a context for path expressions. @since 1.1

        Object root = selectQuery.getRoot();


        // totally invalid path would result in ExpressionException
        try {
            Expression exp = Expression.fromString(prefetch);
            Object object = exp.evaluate(root);
            if (object instanceof Relationship) {
                return ((Relationship) object).isToMany();
            }
            else {
                return false;

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    public int compare(Object o1, Object o2) {
        Expression exp = getSortSpec();
        Object value1 = null;
        Object value2 = null;
        try {
            value1 = exp.evaluate(o1);
        }
        catch (ExpressionException e) {
            if (pathExceptionSuppressed
                    && e.getCause() instanceof org.apache.cayenne.reflect.UnresolvablePathException) {
                // do nothing, we expect this

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                throw e;
            }
        }


        try {
            value2 = exp.evaluate(o2);
        }
        catch (ExpressionException e) {
            if (pathExceptionSuppressed
                    && e.getCause() instanceof org.apache.cayenne.reflect.UnresolvablePathException) {
                // do nothing, we expect this

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    public void testEvaluateADD() throws Exception {
        Expression add = new ASTAdd(new Object[] {
                new Integer(1), new Double(5.5)
        });
        assertEquals(6.5, ((Number) add.evaluate(null)).doubleValue(), 0.0001);
    }


    public void testEvaluateSubtract() throws Exception {
        Expression subtract = new ASTSubtract(new Object[] {
                new Integer(1), new Double(0.1), new Double(0.2)

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    public void testEvaluateSubtract() throws Exception {
        Expression subtract = new ASTSubtract(new Object[] {
                new Integer(1), new Double(0.1), new Double(0.2)
        });
        assertEquals(0.7, ((Number) subtract.evaluate(null)).doubleValue(), 0.0001);
    }


    public void testEvaluateMultiply() throws Exception {
        Expression multiply = new ASTMultiply(new Object[] {
                new Integer(2), new Double(3.5)

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    public void testEvaluateMultiply() throws Exception {
        Expression multiply = new ASTMultiply(new Object[] {
                new Integer(2), new Double(3.5)
        });
        assertEquals(7, ((Number) multiply.evaluate(null)).doubleValue(), 0.0001);
    }


    public void testEvaluateDivide() throws Exception {
        Expression divide = new ASTDivide(new Object[] {
                new BigDecimal("7.0"), new BigDecimal("2.0")

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    public void testEvaluateDivide() throws Exception {
        Expression divide = new ASTDivide(new Object[] {
                new BigDecimal("7.0"), new BigDecimal("2.0")
        });
        assertEquals(3.5, ((Number) divide.evaluate(null)).doubleValue(), 0.0001);
    }


    public void testEvaluateNegate() throws Exception {
        assertEquals(-3, ((Number) new ASTNegate(new Integer(3)).evaluate(null))
                .intValue());

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        ObjEntity ae = runtime.getDataDomain().getEntityResolver().lookupObjEntity(
                Artist.class);
        DbEntity ade = ae.getDbEntity();


        Object objTarget = e.evaluate(ae);
        assertTrue(objTarget instanceof DbAttribute);


        Object dbTarget = e.evaluate(ade);
        assertTrue(dbTarget instanceof DbAttribute);
    }

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        DbEntity ade = ae.getDbEntity();


        Object objTarget = e.evaluate(ae);
        assertTrue(objTarget instanceof DbAttribute);


        Object dbTarget = e.evaluate(ade);
        assertTrue(dbTarget instanceof DbAttribute);
    }


    public void testEvaluateEQUAL_TOBigDecimal() throws Exception {
        BigDecimal bd1 = new BigDecimal("2.0");

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