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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.Field;
import com.yahoo.document.datatypes.*;
import com.yahoo.document.serialization.FieldReader;
import com.yahoo.document.serialization.FieldWriter;
import com.yahoo.document.serialization.XmlStream;
import com.yahoo.vespa.indexinglanguage.SimpleTestAdapter;
import org.junit.Test;
import java.util.Arrays;
import java.util.List;
import static com.yahoo.vespa.indexinglanguage.expressions.ExpressionAssert.assertVerify;
import static com.yahoo.vespa.indexinglanguage.expressions.ExpressionAssert.assertVerifyThrows;
import static com.yahoo.vespa.indexinglanguage.expressions.IfThenExpression.Comparator;
import static org.junit.Assert.*;
/**
* @author Simon Thoresen Hult
*/
public class IfThenTestCase {
@Test
public void requireThatAccessorsWork() {
Expression lhs = new AttributeExpression("lhs");
Expression rhs = new AttributeExpression("rhs");
Expression ifTrue = new AttributeExpression("ifTrue");
Expression ifFalse = new AttributeExpression("ifFalse");
IfThenExpression exp = new IfThenExpression(lhs, Comparator.EQ, rhs, ifTrue, ifFalse);
assertSame(lhs, exp.getLeftHandSide());
assertSame(rhs, exp.getRightHandSide());
assertEquals(Comparator.EQ, exp.getComparator());
assertSame(ifTrue, exp.getIfTrueExpression());
assertSame(ifFalse, exp.getIfFalseExpression());
}
@Test
public void requireThatRequiredInputTypeCompatibilityIsVerified() {
Expression exp = newRequiredInput(DataType.STRING, Comparator.EQ, DataType.STRING,
DataType.STRING, DataType.STRING);
assertVerify(DataType.STRING, exp, DataType.STRING);
assertVerifyThrows(null, exp, "Expected string input, but no input is specified");
assertVerifyThrows(DataType.INT, exp, "Expected string input, got int");
assertVerifyThrows(null, () -> newRequiredInput(DataType.INT, Comparator.EQ, DataType.STRING,
DataType.STRING, DataType.STRING),
"Operands require conflicting input types, int vs string");
assertVerifyThrows(null, () -> newRequiredInput(DataType.STRING, Comparator.EQ, DataType.INT,
DataType.STRING, DataType.STRING),
"Operands require conflicting input types, string vs int");
assertVerifyThrows(null, () -> newRequiredInput(DataType.STRING, Comparator.EQ, DataType.STRING,
DataType.INT, DataType.STRING),
"Operands require conflicting input types, string vs int");
assertVerifyThrows(null, () -> newRequiredInput(DataType.STRING, Comparator.EQ, DataType.STRING,
DataType.STRING, DataType.INT),
"Operands require conflicting input types, string vs int");
}
@Test
public void requireThatExpressionCanBeVerified() {
assertVerify(DataType.STRING, new FlattenExpression(), DataType.STRING);
assertVerifyThrows(null, new FlattenExpression(),
"Expected string input, but no input is specified");
assertVerifyThrows(DataType.INT, new FlattenExpression(),
"Expected string input, got int");
}
@Test
public void requireThatIfFalseDefaultsToNull() {
IfThenExpression exp = new IfThenExpression(new AttributeExpression("lhs"), Comparator.EQ,
new AttributeExpression("rhs"), new AttributeExpression("ifTrue"));
assertNull(exp.getIfFalseExpression());
}
@Test
public void requireThatHashCodeAndEqualsAreImplemented() {
Expression lhs = new AttributeExpression("lhs");
Expression rhs = new AttributeExpression("rhs");
Expression ifTrue = new AttributeExpression("ifTrue");
Expression ifFalse = new AttributeExpression("ifFalse");
Expression exp = new IfThenExpression(lhs, Comparator.EQ, rhs, ifTrue, ifFalse);
assertFalse(exp.equals(new Object()));
assertFalse(exp.equals(new IfThenExpression(new IndexExpression("lhs"), Comparator.NE,
new IndexExpression("rhs"),
new IndexExpression("ifTrue"),
new IndexExpression("ifFalse"))));
assertFalse(exp.equals(new IfThenExpression(new AttributeExpression("lhs"), Comparator.NE,
new IndexExpression("rhs"),
new IndexExpression("ifTrue"),
new IndexExpression("ifFalse"))));
assertFalse(exp.equals(new IfThenExpression(new AttributeExpression("lhs"), Comparator.EQ,
new IndexExpression("rhs"),
new IndexExpression("ifTrue"),
new IndexExpression("ifFalse"))));
assertFalse(exp.equals(new IfThenExpression(new AttributeExpression("lhs"), Comparator.EQ,
new AttributeExpression("rhs"),
new IndexExpression("ifTrue"),
new IndexExpression("ifFalse"))));
assertFalse(exp.equals(new IfThenExpression(new AttributeExpression("lhs"), Comparator.EQ,
new AttributeExpression("rhs"),
new AttributeExpression("ifTrue"),
new IndexExpression("ifFalse"))));
assertEquals(exp, new IfThenExpression(new AttributeExpression("lhs"), Comparator.EQ,
new AttributeExpression("rhs"),
new AttributeExpression("ifTrue"),
new AttributeExpression("ifFalse")));
assertEquals(exp.hashCode(), new IfThenExpression(new AttributeExpression("lhs"), Comparator.EQ,
new AttributeExpression("rhs"),
new AttributeExpression("ifTrue"),
new AttributeExpression("ifFalse")).hashCode());
}
@Test
public void requireThatAllChildrenSeeInputValue() {
FieldValueAdapter adapter = createTestAdapter();
new StatementExpression(new ConstantExpression(new IntegerFieldValue(69)),
new IfThenExpression(new AttributeExpression("lhs"),
Comparator.EQ,
new AttributeExpression("rhs"),
new AttributeExpression("ifTrue"),
new AttributeExpression("ifFalse"))).execute(adapter);
assertEquals(new IntegerFieldValue(69), adapter.getInputValue("lhs"));
assertEquals(new IntegerFieldValue(69), adapter.getInputValue("rhs"));
assertEquals(new IntegerFieldValue(69), adapter.getInputValue("ifTrue"));
assertNull(null, adapter.getInputValue("ifFalse"));
adapter = createTestAdapter();
new StatementExpression(new ConstantExpression(new IntegerFieldValue(69)),
new IfThenExpression(new AttributeExpression("lhs"),
Comparator.NE,
new AttributeExpression("rhs"),
new AttributeExpression("ifTrue"),
new AttributeExpression("ifFalse"))).execute(adapter);
assertEquals(new IntegerFieldValue(69), adapter.getInputValue("lhs"));
assertEquals(new IntegerFieldValue(69), adapter.getInputValue("rhs"));
assertNull(null, adapter.getInputValue("ifTrue"));
assertEquals(new IntegerFieldValue(69), adapter.getInputValue("ifFalse"));
}
@Test
public void requireThatElseExpIsOptional() {
ExecutionContext ctx = new ExecutionContext();
Expression exp = new IfThenExpression(new ConstantExpression(new IntegerFieldValue(6)),
Comparator.GT,
new ConstantExpression(new IntegerFieldValue(9)),
new ConstantExpression(new StringFieldValue("69")));
FieldValue val = ctx.setValue(new IntegerFieldValue(96)).execute(exp).getValue();
assertTrue(val instanceof IntegerFieldValue);
assertEquals(96, ((IntegerFieldValue)val).getInteger());
}
@Test
public void requireThatNonNumericValuesUseFieldValueCompareTo() {
FieldValue small = new MyFieldValue(6);
FieldValue large = new MyFieldValue(9);
assertCmpTrue(small, Comparator.EQ, small);
assertCmpFalse(small, Comparator.NE, small);
assertCmpFalse(small, Comparator.GT, small);
assertCmpTrue(small, Comparator.GE, small);
assertCmpFalse(small, Comparator.LT, small);
assertCmpTrue(small, Comparator.LE, small);
assertCmpFalse(small, Comparator.EQ, large);
assertCmpTrue(small, Comparator.NE, large);
assertCmpFalse(small, Comparator.GT, large);
assertCmpFalse(small, Comparator.GE, large);
assertCmpTrue(small, Comparator.LT, large);
assertCmpTrue(small, Comparator.LE, large);
}
@Test
public void requireThatNumericValuesSupportNumericCompareTo() {
List<NumericFieldValue> sixes = Arrays.asList(new ByteFieldValue((byte)6),
new DoubleFieldValue(6.0),
new FloatFieldValue(6.0f),
new IntegerFieldValue(6),
new LongFieldValue(6L));
List<NumericFieldValue> nines = Arrays.asList(new ByteFieldValue((byte)9),
new DoubleFieldValue(9.0),
new FloatFieldValue(9.0f),
new IntegerFieldValue(9),
new LongFieldValue(9L));
for (NumericFieldValue lhs : sixes) {
for (NumericFieldValue rhs : sixes) {
assertCmpTrue(lhs, Comparator.EQ, rhs);
assertCmpFalse(lhs, Comparator.NE, rhs);
assertCmpFalse(lhs, Comparator.GT, rhs);
assertCmpTrue(lhs, Comparator.GE, rhs);
assertCmpFalse(lhs, Comparator.LT, rhs);
assertCmpTrue(lhs, Comparator.LE, rhs);
}
for (NumericFieldValue rhs : nines) {
assertCmpFalse(lhs, Comparator.EQ, rhs);
assertCmpTrue(lhs, Comparator.NE, rhs);
assertCmpFalse(lhs, Comparator.GT, rhs);
assertCmpFalse(lhs, Comparator.GE, rhs);
assertCmpTrue(lhs, Comparator.LT, rhs);
assertCmpTrue(lhs, Comparator.LE, rhs);
}
}
for (NumericFieldValue lhs : nines) {
for (NumericFieldValue rhs : nines) {
assertCmpTrue(lhs, Comparator.EQ, rhs);
assertCmpFalse(lhs, Comparator.NE, rhs);
assertCmpFalse(lhs, Comparator.GT, rhs);
assertCmpTrue(lhs, Comparator.GE, rhs);
assertCmpFalse(lhs, Comparator.LT, rhs);
assertCmpTrue(lhs, Comparator.LE, rhs);
}
for (NumericFieldValue rhs : sixes) {
assertCmpFalse(lhs, Comparator.EQ, rhs);
assertCmpTrue(lhs, Comparator.NE, rhs);
assertCmpTrue(lhs, Comparator.GT, rhs);
assertCmpTrue(lhs, Comparator.GE, rhs);
assertCmpFalse(lhs, Comparator.LT, rhs);
assertCmpFalse(lhs, Comparator.LE, rhs);
}
}
}
@Test
public void requireThatNullLeftOrRightHandSideEvaluatesToNull() {
Expression exp = new IfThenExpression(new GetVarExpression("lhs"), Comparator.EQ, new GetVarExpression("rhs"),
new ConstantExpression(new StringFieldValue("true")),
new ConstantExpression(new StringFieldValue("false")));
assertEquals(new StringFieldValue("true"),
exp.execute(new ExecutionContext().setVariable("lhs", new IntegerFieldValue(69))
.setVariable("rhs", new IntegerFieldValue(69))));
assertEquals(new StringFieldValue("false"),
exp.execute(new ExecutionContext().setVariable("lhs", new IntegerFieldValue(6))
.setVariable("rhs", new IntegerFieldValue(9))));
assertNull(exp.execute(new ExecutionContext().setVariable("lhs", new IntegerFieldValue(69))));
assertNull(exp.execute(new ExecutionContext().setVariable("rhs", new IntegerFieldValue(69))));
}
@Test
public void testRequiredInputType() {
var ifExpression = new IfThenExpression(new InputExpression("field1"),
Comparator.EQ,
new ConstantExpression(new IntegerFieldValue(0)),
wrapLikeTheParser(new ConstantExpression(new StringFieldValue("true"))),
wrapLikeTheParser(new ConstantExpression(new StringFieldValue("false"))));
assertNull(ifExpression.requiredInputType());
assertEquals(DataType.STRING, ifExpression.createdOutputType());
var expression = new ScriptExpression(new StatementExpression(ifExpression,
new AttributeExpression(null)));
assertNull(expression.requiredInputType());
}
private Expression wrapLikeTheParser(Expression expression) {
return new ScriptExpression(new StatementExpression(expression));
}
private static void assertCmpTrue(FieldValue lhs, Comparator cmp, FieldValue rhs) {
assertTrue(evaluateIfThen(lhs, cmp, rhs));
}
private static void assertCmpFalse(FieldValue lhs, Comparator cmp, FieldValue rhs) {
assertFalse(evaluateIfThen(lhs, cmp, rhs));
}
private static boolean evaluateIfThen(FieldValue lhs, Comparator cmp, FieldValue rhs) {
ExecutionContext ctx = new ExecutionContext(new SimpleTestAdapter());
new StatementExpression(
new ConstantExpression(new IntegerFieldValue(1)),
new IfThenExpression(new ConstantExpression(lhs), cmp, new ConstantExpression(rhs),
new SetVarExpression("true"),
new SetVarExpression("false"))).execute(ctx);
return ctx.getVariable("true") != null;
}
private static FieldValueAdapter createTestAdapter() {
return new SimpleTestAdapter(new Field("lhs", DataType.INT),
new Field("rhs", DataType.INT),
new Field("ifTrue", DataType.INT),
new Field("ifFalse", DataType.INT));
}
private static Expression newRequiredInput(DataType lhs, Comparator cmp, DataType rhs, DataType ifTrue, DataType ifFalse) {
return new IfThenExpression(new SimpleExpression(lhs), cmp,
new SimpleExpression(rhs),
new SimpleExpression(ifTrue),
ifFalse != null ? new SimpleExpression(ifFalse) : null);
}
private static class MyFieldValue extends FieldValue {
final Integer val;
MyFieldValue(int val) {
this.val = val;
}
@Override
public DataType getDataType() {
return null;
}
@Override
@Deprecated
public void printXml(XmlStream xml) {
}
@Override
public void clear() {
}
@Override
public void assign(Object o) {
}
@Override
public void serialize(Field field, FieldWriter writer) {
}
@Override
public void deserialize(Field field, FieldReader reader) {
}
@Override
public int compareTo(FieldValue rhs) {
if (!(rhs instanceof MyFieldValue)) {
throw new AssertionError();
}
return val.compareTo(((MyFieldValue)rhs).val);
}
}
}
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