/*
***************************************************************************************
* 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.client.EventBean;
import com.espertech.esper.epl.expression.core.ExprNodeUtility;
import com.espertech.esper.epl.expression.core.ExprValidationException;
import com.espertech.esper.epl.expression.funcs.ExprCaseNode;
import com.espertech.esper.supportunit.bean.SupportBean;
import com.espertech.esper.supportunit.epl.SupportExprNode;
import com.espertech.esper.supportunit.epl.SupportExprNodeFactory;
import com.espertech.esper.supportunit.event.SupportEventBeanFactory;
import com.espertech.esper.util.support.SupportExprValidationContextFactory;
import junit.framework.TestCase;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class TestExprCaseNode extends TestCase {
public void testGetType() throws Exception {
// Template expression is:
// case when (so.floatPrimitive>s1.shortBoxed) then count(5) when (so.LongPrimitive>s1.intPrimitive) then (25 + 130.5) else (3*3) end
ExprCaseNode caseNode = SupportExprNodeFactory.makeCaseSyntax1Node();
assertEquals(String.class, caseNode.getType());
// case when (2.5>2) then count(5) when (1>3) then (25 + 130.5) else (3*3) end
// First when node is true, case node type is the first when node type.
caseNode = SupportExprNodeFactory.makeCaseSyntax2Node();
assertEquals(String.class, caseNode.getType());
}
public void testValidate() throws Exception {
ExprCaseNode caseNode = SupportExprNodeFactory.makeCaseSyntax1Node();
caseNode.validate(SupportExprValidationContextFactory.makeEmpty());
caseNode = SupportExprNodeFactory.makeCaseSyntax2Node();
caseNode.validate(SupportExprValidationContextFactory.makeEmpty());
// No subnodes: Exception is thrown.
tryInvalidValidate(new ExprCaseNode(false));
tryInvalidValidate(new ExprCaseNode(true));
// singe child node not possible, must be 2 at least
caseNode = new ExprCaseNode(false);
caseNode.addChildNode(new SupportExprNode(new Integer(4)));
tryInvalidValidate(caseNode);
// in a case 1 expression (e.g. case when a=b then 1 else 2) the when child nodes must return boolean
caseNode.addChildNode(new SupportExprNode(new Integer(2)));
tryInvalidValidate(caseNode);
// in a case 2 expression (e.g. case a when b then 1 else 2) then a and b types must be comparable
caseNode = new ExprCaseNode(true);
caseNode.addChildNode(new SupportExprNode("a"));
caseNode.addChildNode(new SupportExprNode(1));
caseNode.addChildNode(new SupportExprNode(2));
tryInvalidValidate(caseNode);
}
public void testEvaluate() throws Exception {
ExprCaseNode caseNode = SupportExprNodeFactory.makeCaseSyntax1Node();
caseNode.validate(SupportExprValidationContextFactory.makeEmpty());
assertEquals("a", caseNode.evaluate(makeEvent(1), false, null));
assertEquals("b", caseNode.evaluate(makeEvent(2), false, null));
assertEquals("c", caseNode.evaluate(makeEvent(3), false, null));
caseNode = SupportExprNodeFactory.makeCaseSyntax2Node();
caseNode.validate(SupportExprValidationContextFactory.makeEmpty());
assertEquals("a", caseNode.evaluate(makeEvent(1), false, null));
assertEquals("b", caseNode.evaluate(makeEvent(2), false, null));
assertEquals("c", caseNode.evaluate(makeEvent(3), false, null));
}
public void testEquals() throws Exception {
ExprCaseNode caseNode = SupportExprNodeFactory.makeCaseSyntax1Node();
ExprCaseNode otherCaseNode = SupportExprNodeFactory.makeCaseSyntax1Node();
ExprCaseNode caseNodeSyntax2 = SupportExprNodeFactory.makeCaseSyntax2Node();
ExprCaseNode otherCaseNodeSyntax2 = SupportExprNodeFactory.makeCaseSyntax2Node();
assertTrue(caseNode.equalsNode(otherCaseNode, false));
assertTrue(otherCaseNode.equalsNode(caseNode, false));
assertFalse(caseNode.equalsNode(caseNodeSyntax2, false));
assertFalse(caseNodeSyntax2.equalsNode(caseNode, false));
assertTrue(caseNodeSyntax2.equalsNode(otherCaseNodeSyntax2, false));
}
public void testToExpressionString() throws Exception {
ExprCaseNode _caseNode = SupportExprNodeFactory.makeCaseSyntax1Node();
assertEquals("case when s0.intPrimitive=1 then \"a\" when s0.intPrimitive=2 then \"b\" else \"c\" end", ExprNodeUtility.toExpressionStringMinPrecedenceSafe(_caseNode));
_caseNode = SupportExprNodeFactory.makeCaseSyntax2Node();
assertEquals("case s0.intPrimitive when 1 then \"a\" when 2 then \"b\" else \"c\" end", ExprNodeUtility.toExpressionStringMinPrecedenceSafe(_caseNode));
}
private void tryInvalidValidate(ExprCaseNode exprCaseNode) throws Exception {
try {
exprCaseNode.validate(SupportExprValidationContextFactory.makeEmpty());
fail();
} catch (ExprValidationException ex) {
// expected
}
}
private EventBean[] makeEvent(int intPrimitive) {
SupportBean theEvent = new SupportBean();
theEvent.setIntPrimitive(intPrimitive);
return new EventBean[]{SupportEventBeanFactory.createObject(theEvent)};
}
private static final Logger log = LoggerFactory.getLogger(TestExprCaseNode.class);
}