TestExprMinMaxRowNode.java example

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/*
 ***************************************************************************************
 *  Copyright (C) 2006 EsperTech, Inc. All rights reserved.                            *
 *  http://www.espertech.com/esper                                                     *
 *  http://www.espertech.com                                                           *
 *  ---------------------------------------------------------------------------------- *
 *  The software in this package is published under the terms of the GPL license       *
 *  a copy of which has been included with this distribution in the license.txt file.  *
 ***************************************************************************************
 */
package com.espertech.esper.epl.expression.ops;

import com.espertech.esper.epl.expression.core.ExprNodeUtility;
import com.espertech.esper.epl.expression.core.ExprValidationException;
import com.espertech.esper.epl.expression.funcs.ExprMinMaxRowNode;
import com.espertech.esper.supportunit.epl.SupportExprNode;
import com.espertech.esper.type.MinMaxTypeEnum;
import com.espertech.esper.util.support.SupportExprValidationContextFactory;
import junit.framework.TestCase;

public class TestExprMinMaxRowNode extends TestCase {
    private ExprMinMaxRowNode minMaxNode;

    public void setUp() {
        minMaxNode = new ExprMinMaxRowNode(MinMaxTypeEnum.MAX);
    }

    public void testGetType() throws Exception {
        minMaxNode.addChildNode(new SupportExprNode(Double.class));
        minMaxNode.addChildNode(new SupportExprNode(Integer.class));
        minMaxNode.validate(SupportExprValidationContextFactory.makeEmpty());
        assertEquals(Double.class, minMaxNode.getType());

        minMaxNode.addChildNode(new SupportExprNode(Double.class));
        minMaxNode.validate(SupportExprValidationContextFactory.makeEmpty());
        assertEquals(Double.class, minMaxNode.getType());
    }

    public void testToExpressionString() throws Exception {
        minMaxNode.addChildNode(new SupportExprNode(9d));
        minMaxNode.addChildNode(new SupportExprNode(6));
        assertEquals("max(9.0,6)", ExprNodeUtility.toExpressionStringMinPrecedenceSafe(minMaxNode));
        minMaxNode.addChildNode(new SupportExprNode(0.5d));
        assertEquals("max(9.0,6,0.5)", ExprNodeUtility.toExpressionStringMinPrecedenceSafe(minMaxNode));
    }

    public void testValidate() {
        // Must have 2 or more subnodes
        try {
            minMaxNode.validate(SupportExprValidationContextFactory.makeEmpty());
            fail();
        } catch (ExprValidationException ex) {
            // Expected
        }

        // Must have only number-type subnodes
        minMaxNode.addChildNode(new SupportExprNode(String.class));
        minMaxNode.addChildNode(new SupportExprNode(Integer.class));
        try {
            minMaxNode.validate(SupportExprValidationContextFactory.makeEmpty());
            fail();
        } catch (ExprValidationException ex) {
            // Expected
        }
    }

    public void testEvaluate() throws Exception {
        minMaxNode = new ExprMinMaxRowNode(MinMaxTypeEnum.MAX);
        setupNode(minMaxNode, 10, 1.5, null);
        assertEquals(10d, minMaxNode.evaluate(null, false, null));

        minMaxNode = new ExprMinMaxRowNode(MinMaxTypeEnum.MAX);
        setupNode(minMaxNode, 1, 1.5, null);
        assertEquals(1.5d, minMaxNode.evaluate(null, false, null));

        minMaxNode = new ExprMinMaxRowNode(MinMaxTypeEnum.MIN);
        setupNode(minMaxNode, 1, 1.5, null);
        assertEquals(1d, minMaxNode.evaluate(null, false, null));

        minMaxNode = new ExprMinMaxRowNode(MinMaxTypeEnum.MAX);
        setupNode(minMaxNode, 1, 1.5, 2.0f);
        assertEquals(2.0d, minMaxNode.evaluate(null, false, null));

        minMaxNode = new ExprMinMaxRowNode(MinMaxTypeEnum.MIN);
        setupNode(minMaxNode, 6, 3.5, 2.0f);
        assertEquals(2.0d, minMaxNode.evaluate(null, false, null));

        minMaxNode = makeNode(null, Integer.class, 5, Integer.class, 6, Integer.class);
        assertNull(minMaxNode.evaluate(null, false, null));
        minMaxNode = makeNode(7, Integer.class, null, Integer.class, 6, Integer.class);
        assertNull(minMaxNode.evaluate(null, false, null));
        minMaxNode = makeNode(3, Integer.class, 5, Integer.class, null, Integer.class);
        assertNull(minMaxNode.evaluate(null, false, null));
        minMaxNode = makeNode(null, Integer.class, null, Integer.class, null, Integer.class);
        assertNull(minMaxNode.evaluate(null, false, null));
    }

    public void testEqualsNode() throws Exception {
        assertTrue(minMaxNode.equalsNode(minMaxNode, false));
        assertFalse(minMaxNode.equalsNode(new ExprMinMaxRowNode(MinMaxTypeEnum.MIN), false));
        assertFalse(minMaxNode.equalsNode(new ExprOrNode(), false));
    }

    private static void setupNode(ExprMinMaxRowNode nodeMin, int intValue, double doubleValue, Float floatValue) throws Exception {
        nodeMin.addChildNode(new SupportExprNode(new Integer(intValue)));
        nodeMin.addChildNode(new SupportExprNode(new Double(doubleValue)));
        if (floatValue != null) {
            nodeMin.addChildNode(new SupportExprNode(floatValue));
        }
        nodeMin.validate(SupportExprValidationContextFactory.makeEmpty());
    }

    private ExprMinMaxRowNode makeNode(Object valueOne, Class typeOne,
                                       Object valueTwo, Class typeTwo,
                                       Object valueThree, Class typeThree) throws Exception {
        ExprMinMaxRowNode maxNode = new ExprMinMaxRowNode(MinMaxTypeEnum.MAX);
        maxNode.addChildNode(new SupportExprNode(valueOne, typeOne));
        maxNode.addChildNode(new SupportExprNode(valueTwo, typeTwo));
        maxNode.addChildNode(new SupportExprNode(valueThree, typeThree));
        maxNode.validate(SupportExprValidationContextFactory.makeEmpty());
        return maxNode;
    }

}