org.h2.expression.function.Function1_2 Maven / Gradle / Ivy
/*
* 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.function;
import org.h2.engine.SessionLocal;
import org.h2.expression.Expression;
import org.h2.expression.Operation1_2;
import org.h2.message.DbException;
import org.h2.value.Value;
import org.h2.value.ValueNull;
/**
* Function with two arguments.
*/
public abstract class Function1_2 extends Operation1_2 implements NamedExpression {
protected Function1_2(Expression left, Expression right) {
super(left, right);
}
@Override
public Value getValue(SessionLocal session) {
Value v1 = left.getValue(session);
if (v1 == ValueNull.INSTANCE) {
return ValueNull.INSTANCE;
}
Value v2;
if (right != null) {
v2 = right.getValue(session);
if (v2 == ValueNull.INSTANCE) {
return ValueNull.INSTANCE;
}
} else {
v2 = null;
}
return getValue(session, v1, v2);
}
/**
* Returns the value of this function.
*
* @param session
* the session
* @param v1
* the value of first argument
* @param v2
* the value of second argument, or {@code null}
* @return the resulting value
*/
protected Value getValue(SessionLocal session, Value v1, Value v2) {
throw DbException.getInternalError();
}
@Override
public StringBuilder getUnenclosedSQL(StringBuilder builder, int sqlFlags) {
left.getUnenclosedSQL(builder.append(getName()).append('('), sqlFlags);
if (right != null) {
right.getUnenclosedSQL(builder.append(", "), sqlFlags);
}
return builder.append(')');
}
}