org.h2.expression.function.SignalFunction 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 java.util.regex.Pattern;
import org.h2.engine.SessionLocal;
import org.h2.expression.Expression;
import org.h2.message.DbException;
import org.h2.value.TypeInfo;
import org.h2.value.Value;
/**
* A SIGNAL function.
*/
public final class SignalFunction extends Function2 {
private static final Pattern SIGNAL_PATTERN = Pattern.compile("[0-9A-Z]{5}");
public SignalFunction(Expression arg1, Expression arg2) {
super(arg1, arg2);
}
@Override
public Value getValue(SessionLocal session, Value v1, Value v2) {
String sqlState = v1.getString();
if (sqlState.startsWith("00") || !SIGNAL_PATTERN.matcher(sqlState).matches()) {
throw DbException.getInvalidValueException("SQLSTATE", sqlState);
}
throw DbException.fromUser(sqlState, v2.getString());
}
@Override
public Expression optimize(SessionLocal session) {
left = left.optimize(session);
right = right.optimize(session);
type = TypeInfo.TYPE_NULL;
return this;
}
@Override
public String getName() {
return "SIGNAL";
}
}