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package org.hsqldb.types;

import org.hsqldb.OpTypes;
import org.hsqldb.Session;
import org.hsqldb.SessionInterface;
import org.hsqldb.Tokens;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.jdbc.JDBCClobClient;

Type object for CLOB.

Author:
Fred Toussi (fredt@users dot sourceforge.net)
Version:
2.5.0
Since:
1.9.0/**
 * Type object for CLOB.<p>
 *
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 2.5.0
 * @since 1.9.0
 */
public final class ClobType extends CharacterType {

    public static final long maxClobPrecision     = 1024L * 1024 * 1024 * 1024;
    public static final int  defaultClobSize      = 1024 * 1024 * 1024;
    public static final int  defaultShortClobSize = 16 * 1024 * 1024;

    public ClobType(long precision) {
        super(Types.SQL_CLOB, precision);
    }

    public ClobType(Collation collation, long precision) {
        super(collation, Types.SQL_CLOB, precision);
    }

    public int displaySize() {
        return precision > Integer.MAX_VALUE ? Integer.MAX_VALUE
                                             : (int) precision;
    }

    public int getJDBCTypeCode() {
        return Types.CLOB;
    }

    public Class getJDBCClass() {
        return java.sql.Clob.class;
    }

    public String getJDBCClassName() {
        return "java.sql.Clob";
    }

    public int getSQLGenericTypeCode() {
        return typeCode;
    }

    public String getDefinition() {

        long   factor     = precision;
        String multiplier = null;

        if (precision % (1024) == 0) {
            if (precision % (1024 * 1024 * 1024) == 0) {
                factor     = precision / (1024 * 1024 * 1024);
                multiplier = Tokens.T_G_FACTOR;
            } else if (precision % (1024 * 1024) == 0) {
                factor     = precision / (1024 * 1024);
                multiplier = Tokens.T_M_FACTOR;
            } else {
                factor     = precision / (1024);
                multiplier = Tokens.T_K_FACTOR;
            }
        }

        StringBuilder sb = new StringBuilder(16);

        sb.append(getNameString());
        sb.append('(');
        sb.append(factor);

        if (multiplier != null) {
            sb.append(multiplier);
        }

        sb.append(')');

        return sb.toString();
    }

    public long getMaxPrecision() {
        return maxClobPrecision;
    }

    public boolean isLobType() {
        return true;
    }

    
@todo
- collation comparison/** @todo - collation comparison */
    public int compare(Session session, Object a, Object b) {
        return compare(session, a, b, OpTypes.EQUAL);
    }

    public int compare(Session session, Object a, Object b, int opType) {

        if (a == b) {
            return 0;
        }

        if (a == null) {
            return -1;
        }

        if (b == null) {
            return 1;
        }

        if (b instanceof String) {
            long lobId = ((ClobData) a).getId();

            return session.database.lobManager.compare(collation,
                    lobId, (String) b);
        }

        return session.database.lobManager.compare(collation, (ClobData) a,
                (ClobData) b);
    }

    public Object convertToDefaultType(SessionInterface session, Object a) {

        if (a == null) {
            return null;
        }

        if (a instanceof ClobData) {
            return a;
        }

        if (a instanceof String) {
            ClobData clob = session.createClob(((String) a).length());

            clob.setString(session, 0, (String) a);

            return clob;
        }

        throw Error.error(ErrorCode.X_42561);
    }

    public String convertToString(Object a) {

        if (a == null) {
            return null;
        }

        return Long.toString(((ClobData) a).getId());
    }

    public String convertToSQLString(Object a) {

        if (a == null) {
            return Tokens.T_NULL;
        }

        return convertToString(a);
    }

    public Object convertJavaToSQL(SessionInterface session, Object a) {

        if (a == null) {
            return null;
        }

        if (a instanceof JDBCClobClient) {
            return ((JDBCClobClient) a).getClob();
        }

        throw Error.error(ErrorCode.X_42561);
    }

    public Object convertSQLToJava(SessionInterface session, Object a) {

        if (a == null) {
            return null;
        }

        if (a instanceof ClobDataID) {
            ClobDataID clob = (ClobDataID) a;

            return new JDBCClobClient(session, clob);
        }

        throw Error.error(ErrorCode.X_42561);
    }

    public long position(SessionInterface session, Object data,
                         Object otherData, Type otherType, long start) {

        if (otherType.typeCode == Types.SQL_CLOB) {
            return ((ClobData) data).position(session, (ClobData) otherData,
                                              start);
        } else if (otherType.isCharacterType()) {
            return ((ClobData) data).position(session, (String) otherData,
                                              start);
        } else {
            throw Error.runtimeError(ErrorCode.U_S0500, "ClobType");
        }
    }
}