/*
 * Microsoft JDBC Driver for SQL Server Copyright(c) Microsoft Corporation All rights reserved. This program is made
 * available under the terms of the MIT License. See the LICENSE file in the project root for more information.
 */

package com.microsoft.sqlserver.jdbc;

UDTTDSHeader is helper class used to read and write the UDT TDS 7.2x header from a TDS stream.
Typical UDT header->
UDT header with schema/type/assembly information
F0 21 00 <- MaxLen (2 byte length) 03|54 00 44 00 53 00 <- DB_NAME (1 byte length in UNICODE chars) 03|64 00 62 00 6F
00 <- SCHEMA_NAME (1 byte length in UNICODE chars) 12|4D 00 79 00 43 00 68 00 75 00 6E 00 6B 00 79 <- TYPE_NAME (1
byte length in UNICODE chars) 00 46 00 75 00 6E 00 6B 00 79 00 54 00 79 00 70 00 65 00 32 00 63 00|4D 00 79 00 43 00
68 00 75 00 6E 00 6B 00 <- ASSEMBLY_QUALIFIED_NAME (2 byte length in UNICODE chars) 79 00 46 00 75 00 6E 00 6B 00 79
00 54 00 79 00 70 00 65 00 32 00 2C 00 20 00 53 00 71 00 6C 00
/**
 * UDTTDSHeader is helper class used to read and write the UDT TDS 7.2x header from a TDS stream.
 * 
 * Typical UDT header->
 *
 * UDT header with schema/type/assembly information
 *
 * F0 21 00 <- MaxLen (2 byte length) 03|54 00 44 00 53 00 <- DB_NAME (1 byte length in UNICODE chars) 03|64 00 62 00 6F
 * 00 <- SCHEMA_NAME (1 byte length in UNICODE chars) 12|4D 00 79 00 43 00 68 00 75 00 6E 00 6B 00 79 <- TYPE_NAME (1
 * byte length in UNICODE chars) 00 46 00 75 00 6E 00 6B 00 79 00 54 00 79 00 70 00 65 00 32 00 63 00|4D 00 79 00 43 00
 * 68 00 75 00 6E 00 6B 00 <- ASSEMBLY_QUALIFIED_NAME (2 byte length in UNICODE chars) 79 00 46 00 75 00 6E 00 6B 00 79
 * 00 54 00 79 00 70 00 65 00 32 00 2C 00 20 00 53 00 71 00 6C 00
 * 
 */

final class UDTTDSHeader {
    private final int maxLen; // MaxLen read from UDT type (not used when writing).
    @SuppressWarnings("unused")
    private final String databaseName; // Database name where UDT type resides.
    @SuppressWarnings("unused")
    private final String schemaName; // Schema where UDT resides.
    private final String typeName; // Type name of UDT.
    @SuppressWarnings("unused")
    private final String assemblyQualifiedName; // Assembly qualified name of UDT.

    UDTTDSHeader(TDSReader tdsReader) throws SQLServerException {
        maxLen = tdsReader.readUnsignedShort();
        databaseName = tdsReader.readUnicodeString(tdsReader.readUnsignedByte());
        schemaName = tdsReader.readUnicodeString(tdsReader.readUnsignedByte());
        typeName = tdsReader.readUnicodeString(tdsReader.readUnsignedByte());
        assemblyQualifiedName = tdsReader.readUnicodeString(tdsReader.readUnsignedShort());
    }

    int getMaxLen() {
        return maxLen;
    }

    String getTypeName() {
        return typeName;
    }
}