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// Copyright Vespa.ai. 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.collections.Pair;
import com.yahoo.document.DataType;
import com.yahoo.document.DocumentType;
import com.yahoo.document.Field;
import com.yahoo.document.datatypes.FieldValue;
import com.yahoo.vespa.indexinglanguage.ExpressionConverter;
import com.yahoo.vespa.objects.ObjectOperation;
import com.yahoo.vespa.objects.ObjectPredicate;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
/**
* @author Simon Thoresen Hult
*/
public final class SelectInputExpression extends CompositeExpression {
private final List<Pair<String, Expression>> cases;
@SafeVarargs
@SuppressWarnings("varargs")
public SelectInputExpression(Pair<String, Expression>... cases) {
this(Arrays.asList(cases));
}
public SelectInputExpression(List<Pair<String, Expression>> cases) {
super(null);
this.cases = cases;
}
@Override
public SelectInputExpression convertChildren(ExpressionConverter converter) {
return new SelectInputExpression(cases.stream()
.map(c -> new Pair<>(c.getFirst(), converter.branch().convert(c.getSecond())))
.toList());
}
@Override
public void setStatementOutput(DocumentType documentType, Field field) {
for (var casePair : cases)
casePair.getSecond().setStatementOutput(documentType, field);
}
@Override
protected void doExecute(ExecutionContext context) {
FieldValue input = context.getValue();
for (Pair<String, Expression> entry : cases) {
FieldValue val = context.getInputValue(entry.getFirst());
if (val != null) {
context.setValue(val).execute(entry.getSecond());
break;
}
}
context.setValue(input);
}
@Override
protected void doVerify(VerificationContext context) {
DataType input = context.getValueType();
for (Pair<String, Expression> entry : cases) {
DataType val = context.getInputType(this, entry.getFirst());
if (val == null) {
throw new VerificationException(this, "Field '" + entry.getFirst() + "' not found");
}
context.setValueType(val).execute(entry.getSecond());
}
context.setValueType(input);
}
@Override
public void selectMembers(ObjectPredicate predicate, ObjectOperation operation) {
for (Pair<String, Expression> entry : cases) {
select(entry.getSecond(), predicate, operation);
}
}
@Override
public DataType createdOutputType() {
return null;
}
public List<Pair<String, Expression>> getCases() {
return Collections.unmodifiableList(cases);
}
@Override
public String toString() {
StringBuilder ret = new StringBuilder();
ret.append("select_input { ");
for (Pair<String, Expression> entry : cases) {
ret.append(entry.getFirst()).append(": ");
Expression exp = entry.getSecond();
ret.append(exp).append("; ");
}
ret.append("}");
return ret.toString();
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof SelectInputExpression rhs)) return false;
if (!cases.equals(rhs.cases)) return false;
return true;
}
@Override
public int hashCode() {
return getClass().hashCode() + cases.hashCode();
}
}
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