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package org.hsqldb.types;
import org.hsqldb.Session;
import org.hsqldb.SessionInterface;
import org.hsqldb.Tokens;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
Type subclass for untyped NULL values.
Author: Fred Toussi (fredt@users dot sourceforge.net) Version: 2.3.1 Since: 1.9.0
/**
* Type subclass for untyped NULL values.<p>
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.3.1
* @since 1.9.0
*/
public final class NullType extends Type {
static final NullType nullType = new NullType();
private NullType() {
super(Types.SQL_ALL_TYPES, Types.SQL_ALL_TYPES, 0, 0);
}
public int displaySize() {
return 4;
}
public int getJDBCTypeCode() {
return typeCode;
}
public Class getJDBCClass() {
return java.lang.Void.class;
}
public String getJDBCClassName() {
return "java.lang.Void";
}
public String getNameString() {
return Tokens.T_NULL;
}
public String getDefinition() {
return Tokens.T_NULL;
}
public Type getAggregateType(Type other) {
return other;
}
public Type getCombinedType(Session session, Type other, int operation) {
return other;
}
public int compare(Session session, Object a, Object b) {
throw Error.runtimeError(ErrorCode.U_S0500, "NullType");
}
public Object convertToTypeLimits(SessionInterface session, Object a) {
return null;
}
public Object convertToType(SessionInterface session, Object a,
Type otherType) {
return null;
}
public Object convertToDefaultType(SessionInterface session, Object a) {
return null;
}
public String convertToString(Object a) {
return Tokens.T_NULL;
}
public String convertToSQLString(Object a) {
return Tokens.T_NULL;
}
public boolean canConvertFrom(Type otherType) {
return true;
}
public static Type getNullType() {
return nullType;
}
}