org.h2.expression.condition.Condition Maven / Gradle / Ivy
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/*
* Copyright 2004-2022 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (https://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.expression.condition;
import org.h2.engine.SessionLocal;
import org.h2.expression.Expression;
import org.h2.expression.function.CastSpecification;
import org.h2.value.TypeInfo;
import org.h2.value.Value;
/**
* Represents a condition returning a boolean value, or NULL.
*/
abstract class Condition extends Expression {
/**
* Add a cast around the expression (if necessary) so that the type is boolean.
*
* @param session the session
* @param expression the expression
* @return the new expression
*/
static Expression castToBoolean(SessionLocal session, Expression expression) {
if (expression.getType().getValueType() == Value.BOOLEAN) {
return expression;
}
return new CastSpecification(expression, TypeInfo.TYPE_BOOLEAN);
}
@Override
public TypeInfo getType() {
return TypeInfo.TYPE_BOOLEAN;
}
}