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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.DocumentType;
import com.yahoo.document.Field;
import com.yahoo.document.datatypes.FieldValue;
import com.yahoo.document.datatypes.NumericFieldValue;
import com.yahoo.vespa.indexinglanguage.ExpressionConverter;
import com.yahoo.vespa.objects.ObjectOperation;
import com.yahoo.vespa.objects.ObjectPredicate;
import java.math.BigDecimal;
/**
* @author Simon Thoresen Hult
*/
public final class IfThenExpression extends CompositeExpression {
public enum Comparator {
EQ("=="),
NE("!="),
LT("<"),
LE("<="),
GT(">"),
GE(">=");
private final String img;
private Comparator(String img) {
this.img = img;
}
@Override
public String toString() {
return img;
}
}
private final Expression lhs;
private final Comparator cmp;
private final Expression rhs;
private final Expression ifTrue;
private final Expression ifFalse;
public IfThenExpression(Expression lhs, Comparator cmp, Expression rhs, Expression ifTrue) {
this(lhs, cmp, rhs, ifTrue, null);
}
public IfThenExpression(Expression lhs, Comparator cmp, Expression rhs, Expression ifTrue, Expression ifFalse) {
super(resolveInputType(lhs, rhs, ifTrue, ifFalse));
this.lhs = lhs;
this.cmp = cmp;
this.rhs = rhs;
this.ifTrue = ifTrue;
this.ifFalse = ifFalse;
}
@Override
public IfThenExpression convertChildren(ExpressionConverter converter) {
return new IfThenExpression(converter.branch().convert(lhs),
cmp,
converter.branch().convert(rhs),
converter.branch().convert(ifTrue),
converter.branch().convert(ifFalse));
}
@Override
public void setStatementOutput(DocumentType documentType, Field field) {
lhs.setStatementOutput(documentType, field);
rhs.setStatementOutput(documentType, field);
ifTrue.setStatementOutput(documentType, field);
ifFalse.setStatementOutput(documentType, field);
}
public Expression getLeftHandSide() {
return lhs;
}
public Comparator getComparator() {
return cmp;
}
public Expression getRightHandSide() {
return rhs;
}
public Expression getIfTrueExpression() {
return ifTrue;
}
public Expression getIfFalseExpression() {
return ifFalse;
}
@Override
protected void doExecute(ExecutionContext context) {
FieldValue input = context.getValue();
FieldValue lhsVal = context.setValue(input).execute(lhs).getValue();
if (lhsVal == null) {
context.setValue(null);
return;
}
FieldValue rhsVal = context.setValue(input).execute(rhs).getValue();
if (rhsVal == null) {
context.setValue(null);
return;
}
context.setValue(input);
if (isTrue(lhsVal, cmp, rhsVal)) {
ifTrue.execute(context);
} else if (ifFalse != null) {
ifFalse.execute(context);
}
}
@Override
protected void doVerify(VerificationContext context) {
DataType input = context.getValueType();
context.setValueType(input).execute(lhs);
context.setValueType(input).execute(rhs);
context.setValueType(input).execute(ifTrue);
context.setValueType(input).execute(ifFalse);
context.setValueType(input);
}
@Override
public void selectMembers(ObjectPredicate predicate, ObjectOperation operation) {
select(lhs, predicate, operation);
select(rhs, predicate, operation);
select(ifTrue, predicate, operation);
select(ifFalse, predicate, operation);
}
private static DataType resolveInputType(Expression lhs, Expression rhs, Expression ifTrue, Expression ifFalse) {
DataType input = null;
input = resolveRequiredInputType(input, lhs.requiredInputType());
input = resolveRequiredInputType(input, rhs.requiredInputType());
input = resolveRequiredInputType(input, ifTrue.requiredInputType());
if (ifFalse != null) {
input = resolveRequiredInputType(input, ifFalse.requiredInputType());
}
return input;
}
@Override
public DataType createdOutputType() {
return null;
}
@Override
public String toString() {
StringBuilder ret = new StringBuilder();
ret.append("if (").append(lhs).append(" ").append(cmp).append(" ").append(rhs).append(") ");
ret.append(toScriptBlock(ifTrue));
if (ifFalse != null) {
ret.append(" else ").append(toScriptBlock(ifFalse));
}
return ret.toString();
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof IfThenExpression exp)) {
return false;
}
if (!lhs.equals(exp.lhs)) {
return false;
}
if (!cmp.equals(exp.cmp)) {
return false;
}
if (!rhs.equals(exp.rhs)) {
return false;
}
if (!ifTrue.equals(exp.ifTrue)) {
return false;
}
if (!equals(ifFalse, exp.ifFalse)) {
return false;
}
return true;
}
@Override
public int hashCode() {
int ret = getClass().hashCode() + lhs.hashCode() + cmp.hashCode() + rhs.hashCode() + ifTrue.hashCode();
if (ifFalse != null) {
ret += ifFalse.hashCode();
}
return ret;
}
private static DataType resolveRequiredInputType(DataType prev, DataType next) {
if (next == null) {
return prev;
}
if (prev == null) {
return next;
}
if (!prev.equals(next)) {
throw new VerificationException(IfThenExpression.class, "Operands require conflicting input types, " +
prev.getName() + " vs " + next.getName() + ".");
}
return prev;
}
private static boolean isTrue(FieldValue lhs, Comparator cmp, FieldValue rhs) {
int res;
if (lhs instanceof NumericFieldValue && rhs instanceof NumericFieldValue) {
BigDecimal lhsVal = ArithmeticExpression.asBigDecimal((NumericFieldValue)lhs);
BigDecimal rhsVal = ArithmeticExpression.asBigDecimal((NumericFieldValue)rhs);
res = lhsVal.compareTo(rhsVal);
} else {
res = lhs.compareTo(rhs);
}
return switch (cmp) {
case EQ -> res == 0;
case NE -> res != 0;
case GT -> res > 0;
case GE -> res >= 0;
case LT -> res < 0;
case LE -> res <= 0;
};
}
}
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