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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.indexinglanguage.expressions;
import com.yahoo.document.DataType;
import com.yahoo.document.datatypes.FieldValue;
import com.yahoo.document.datatypes.IntegerFieldValue;
import com.yahoo.document.datatypes.StringFieldValue;
import org.junit.Test;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import static com.yahoo.vespa.indexinglanguage.expressions.ExpressionAssert.assertVerify;
import static com.yahoo.vespa.indexinglanguage.expressions.ExpressionAssert.assertVerifyThrows;
import static org.junit.Assert.*;
/**
* @author Simon Thoresen Hult
*/
public class SwitchTestCase {
@Test
public void requireThatAccessorsWork() {
Map<String, Expression> cases = new HashMap<>();
Expression foo = new AttributeExpression("foo");
Expression bar = new AttributeExpression("bar");
Expression baz = new AttributeExpression("baz");
cases.put("foo", foo);
cases.put("bar", bar);
SwitchExpression exp = new SwitchExpression(cases, baz);
assertEquals(2, exp.getCases().size());
assertSame(foo, exp.getCases().get("foo"));
assertSame(bar, exp.getCases().get("bar"));
assertSame(baz, exp.getDefaultExpression());
}
@Test
public void requireThatHashCodeAndEqualsAreImplemented() {
Map<String, Expression> cases = new HashMap<>();
Expression foo = new AttributeExpression("foo");
Expression bar = new AttributeExpression("bar");
Expression baz = new AttributeExpression("baz");
cases.put("foo", foo);
cases.put("bar", bar);
SwitchExpression exp = new SwitchExpression(cases, baz);
assertFalse(exp.equals(new Object()));
assertFalse(exp.equals(new SwitchExpression(Collections.singletonMap("foo", foo))));
assertFalse(exp.equals(new SwitchExpression(Collections.singletonMap("foo", foo), baz)));
assertFalse(exp.equals(new SwitchExpression(cases)));
assertEquals(exp, new SwitchExpression(cases, baz));
assertEquals(exp.hashCode(), new SwitchExpression(cases, baz).hashCode());
}
@Test
public void requireThatExpressionCanBeVerified() {
Expression foo = SimpleExpression.newConversion(DataType.STRING, DataType.INT);
Expression exp = new SwitchExpression(Collections.singletonMap("foo", foo));
assertVerify(DataType.STRING, exp, DataType.STRING); // does not touch output
assertVerifyThrows(null, exp, "Expected string input, but no input is specified");
assertVerifyThrows(DataType.INT, exp, "Expected string input, got int");
}
@Test
public void requireThatCasesAreVerified() {
Map<String, Expression> cases = new HashMap<>();
cases.put("foo", SimpleExpression.newRequired(DataType.INT));
assertVerifyThrows(DataType.STRING, new SwitchExpression(cases),
"Expected int input, got string");
assertVerifyThrows(DataType.STRING, new SwitchExpression(Collections.<String, Expression>emptyMap(),
SimpleExpression.newRequired(DataType.INT)),
"Expected int input, got string");
}
@Test
public void requireThatIllegalArgumentThrows() {
try {
new SwitchExpression(Collections.<String, Expression>emptyMap()).execute(new IntegerFieldValue(69));
fail();
} catch (IllegalArgumentException e) {
assertEquals("Expected string input, got int", e.getMessage());
}
}
@Test
public void requireThatDefaultExpressionIsNullIfNotGiven() {
assertNull(new SwitchExpression(Collections.<String, Expression>emptyMap()).getDefaultExpression());
}
@Test
public void requireThatIsEmptyReflectsOnBothCasesAndDefault() {
assertTrue(new SwitchExpression(Collections.<String, Expression>emptyMap()).isEmpty());
assertTrue(new SwitchExpression(Collections.<String, Expression>emptyMap(), null).isEmpty());
assertFalse(new SwitchExpression(Collections.<String, Expression>emptyMap(),
new AttributeExpression("foo")).isEmpty());
assertFalse(new SwitchExpression(Collections.singletonMap("foo", new AttributeExpression("foo")),
null).isEmpty());
assertFalse(new SwitchExpression(Collections.singletonMap("foo", new AttributeExpression("foo")),
new AttributeExpression("foo")).isEmpty());
}
@Test
public void requireThatCorrectExpressionIsExecuted() {
Map<String, Expression> cases = new HashMap<>();
cases.put("foo", new StatementExpression(new ConstantExpression(new StringFieldValue("bar")),
new SetVarExpression("out")));
cases.put("baz", new StatementExpression(new ConstantExpression(new StringFieldValue("cox")),
new SetVarExpression("out")));
Expression exp = new SwitchExpression(cases);
assertEvaluate(new StringFieldValue("foo"), exp, new StringFieldValue("bar"));
assertEvaluate(new StringFieldValue("baz"), exp, new StringFieldValue("cox"));
assertEvaluate(new StringFieldValue("???"), exp, null);
}
@Test
public void requireThatDefaultExpressionIsExecuted() {
Map<String, Expression> cases = new HashMap<>();
cases.put("foo", new StatementExpression(new ConstantExpression(new StringFieldValue("bar")),
new SetVarExpression("out")));
Expression defaultExp = new StatementExpression(new ConstantExpression(new StringFieldValue("cox")),
new SetVarExpression("out"));
Expression exp = new SwitchExpression(cases, defaultExp);
assertEvaluate(new StringFieldValue("foo"), exp, new StringFieldValue("bar"));
assertEvaluate(new StringFieldValue("baz"), exp, new StringFieldValue("cox"));
assertEvaluate(null, exp, new StringFieldValue("cox"));
}
private static void assertEvaluate(FieldValue input, Expression exp, FieldValue expectedOutVar) {
assertEquals(expectedOutVar, new ExecutionContext().setValue(input).execute(exp).getVariable("out"));
}
}
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