/*
 * *************************************************************************************
 *  Copyright (C) 2008 EsperTech, Inc. All rights reserved.                            *
 *  http://esper.codehaus.org                                                          *
 *  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;

import junit.framework.TestCase;
import com.espertech.esper.support.epl.SupportExprNodeFactory;
import com.espertech.esper.support.epl.SupportExprNode;
import com.espertech.esper.support.bean.SupportBean;
import com.espertech.esper.support.event.SupportEventBeanFactory;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.view.window.RandomAccessByIndexGetter;
import com.espertech.esper.view.window.IStreamRandomAccess;

public class TestExprPreviousNode extends TestCase {
    private ExprPreviousNode prevNode;

    public void setUp() throws Exception
    {
        prevNode = SupportExprNodeFactory.makePreviousNode();
    }

    public void testGetType()  throws Exception
    {
        assertEquals(Double.class, prevNode.getType());
    }

    public void testValidate() throws Exception
    {
        prevNode = new ExprPreviousNode(PreviousType.PREV);

        // No subnodes: Exception is thrown.
        tryInvalidValidate(prevNode);

        // singe child node not possible, must be 2 at least
        prevNode.addChildNode(new SupportExprNode(new Integer(4)));
        tryInvalidValidate(prevNode);
    }

    public void testEquals()  throws Exception
    {
        ExprPreviousNode node1 = new ExprPreviousNode(PreviousType.PREV);
        assertTrue(node1.equalsNode(prevNode));
    }

    public void testToExpressionString() throws Exception
    {
        assertEquals("prev(s1.intPrimitive, s1.doublePrimitive)", prevNode.toExpressionString());
    }

    private void tryInvalidValidate(ExprPreviousNode exprPrevNode) throws Exception
    {
        try {
            exprPrevNode.validate(ExprValidationContextFactory.makeEmpty());
            fail();
        }
        catch (ExprValidationException ex)
        {
            // expected
        }
    }
}