/*
* Copyright 2004-2023 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;
import java.io.IOException;
import java.sql.ResultSetMetaData;
import org.h2.api.ErrorCode;
import org.h2.message.DbException;
import org.h2.value.Transfer;
import org.h2.value.TypeInfo;
import org.h2.value.Value;
import org.h2.value.ValueLob;
/**
* A client side (remote) parameter.
*/
public class ParameterRemote implements ParameterInterface {
private Value value;
private final int index;
private TypeInfo type = TypeInfo.TYPE_UNKNOWN;
private int nullable = ResultSetMetaData.columnNullableUnknown;
public ParameterRemote(int index) {
this.index = index;
}
@Override
public void setValue(Value newValue, boolean closeOld) {
if (closeOld && value instanceof ValueLob) {
((ValueLob) value).remove();
}
value = newValue;
}
@Override
public Value getParamValue() {
return value;
}
@Override
public void checkSet() {
if (value == null) {
throw DbException.get(ErrorCode.PARAMETER_NOT_SET_1, "#" + (index + 1));
}
}
@Override
public boolean isValueSet() {
return value != null;
}
@Override
public TypeInfo getType() {
return value == null ? type : value.getType();
}
@Override
public int getNullable() {
return nullable;
}
/**
* Read the parameter meta data from the transfer object.
*
* @param transfer the transfer object
* @throws IOException on failure
*/
public void readMetaData(Transfer transfer) throws IOException {
type = transfer.readTypeInfo();
nullable = transfer.readInt();
}
/**
* Write the parameter meta data to the transfer object.
*
* @param transfer the transfer object
* @param p the parameter
* @throws IOException on failure
*/
public static void writeMetaData(Transfer transfer, ParameterInterface p) throws IOException {
transfer.writeTypeInfo(p.getType()).writeInt(p.getNullable());
}
}