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///////////////////////////////////////////////////////////////////////////////
//
// JTOpen (IBM Toolbox for Java - OSS version)
//
// Filename: DBColumnDescriptorsDataFormat.java
//
// The source code contained herein is licensed under the IBM Public License
// Version 1.0, which has been approved by the Open Source Initiative.
// Copyright (C) 1997-2001 International Business Machines Corporation and
// others. All rights reserved.
//
///////////////////////////////////////////////////////////////////////////////
package com.ibm.as400.access;
import java.io.UnsupportedEncodingException;
import java.sql.SQLException;
/**
The DBColumnDescriptorsDataFormat describes the
data in the variable length column descriptor.
**/
class DBColumnDescriptorsDataFormat
{
private static final String copyright = "Copyright (C) 1997-2001 International Business Machines Corporation and others.";
// Store these as byte arrays so we can
private byte[] baseColumnName_;
private byte[] baseTableName_;
private byte[] baseTableSchemaName_;
// Column label is a string because we are given the CCSID in the field if we receive
// a column label from the system.
private String columnLabel_;
private int jobCCSID_; // Fix for JTOpen Bug 4034
BidiConversionProperties bidiConversionProperties_ = null; // @Q8A Bidi Conversion properties
/**
Constructs a DBColumnDescriptorsDataFormat object. Use this when overlaying
on a reply datastream. The cached data will be set when overlay()
is called.
**/
DBColumnDescriptorsDataFormat(SQLConversionSettings settings) /*@Q8C*/
{
/*@Q8A*/
int bidiStringType = BidiStringType.ST5; /*@Q8C*/
boolean bidiImplicitReordering = true;
boolean bidiNumericOrdering = false ;
if (settings != null) {
bidiStringType = settings.getBidiStringType();
// if bidiStringType is not set by user, use the default 5
if(bidiStringType == -1)
bidiStringType = BidiStringType.ST5;
bidiImplicitReordering = settings.getBidiImplicitReordering();
bidiNumericOrdering = settings.getBidiNumericOrdering();
}
bidiConversionProperties_ = new BidiConversionProperties(bidiStringType);
bidiConversionProperties_.setBidiImplicitReordering(bidiImplicitReordering);
bidiConversionProperties_.setBidiNumericOrderingRoundTrip(bidiNumericOrdering);
}
// Fix for JTOpen Bug 4034
/**
Constructs a DBColumnDescriptorsDataFormat object. Use this when overlaying
on a reply datastream. The cached data will be set when overlay()
is called.
@param jobCCSID The ccsid of the server job.
@param settings The conversion settings used when converting the column names
**/
DBColumnDescriptorsDataFormat(int jobCCSID, SQLConversionSettings settings) //@Q8C
{
this(settings);
jobCCSID_ = jobCCSID;
}
/**
Positions the overlay structure. This reads the cached data only
when it was not previously set by the constructor.
**/
void overlay (byte[] rawBytes, int offset, int variableColumnInfoLength)
throws SQLException
{
// Parse through how ever many of the 3900, 3901, 3902, and 3904 there are (can be 0
// to 4).
// Make sure variableColumnInfoLength is greater than 0. If it is 0,
// that means the query did not return us variable column information.
while (variableColumnInfoLength > 0)
{
int length = BinaryConverter.byteArrayToInt (rawBytes, offset);
short codePoint = BinaryConverter.byteArrayToShort (rawBytes, offset + 4);
switch (codePoint)
{
case 0x3900:
// base column name
baseColumnName_ = new byte[length-6];
System.arraycopy(rawBytes, offset + 6, baseColumnName_, 0, length-6);
break;
case 0x3901:
// base table name
baseTableName_ = new byte[length-6];
System.arraycopy(rawBytes, offset + 6, baseTableName_, 0, length-6);
break;
case 0x3902:
// column label (carries its own CCSID, so make it a String, not a byte array)
int ccsid = BinaryConverter.byteArrayToShort (rawBytes, offset + 6);
if(ccsid == -1) // Fix for JTOpen Bug 4034 - CCSID is 65535, use the server job's ccsid
ccsid = jobCCSID_; // Fix for JTOpen Bug 4034
try
{
columnLabel_ = (ConvTable.getTable(ccsid, null)).byteArrayToString(rawBytes,
offset + 8,
length-8,
bidiConversionProperties_); //@Q8C
}
catch (UnsupportedEncodingException e)
{
JDError.throwSQLException (JDError.EXC_INTERNAL, e);
}
break;
case 0x3904:
// schema name
baseTableSchemaName_ = new byte[length-6];
System.arraycopy(rawBytes, offset + 6, baseTableSchemaName_, 0, length-6);
break;
}
//Subtract off the length what we took off the datastream.
variableColumnInfoLength = variableColumnInfoLength - length;
//Move the offset to the next code point.
offset = offset + length;
}
}
String getBaseColumnName(ConvTable convTable)
{
//We don't have to be returned a baseColumnName by the system, depending on the query
if (baseColumnName_ != null)
{
return convTable.byteArrayToString (baseColumnName_, 0, baseColumnName_.length, bidiConversionProperties_); //@Q8C
}
else
return null;
}
String getBaseTableName(ConvTable convTable)
{
//We don't have to be returned a baseTableName by the system, depending on the query
if (baseTableName_ != null)
{
return convTable.byteArrayToString (baseTableName_, 0, baseTableName_.length, bidiConversionProperties_); //@Q8C
}
else
return null;
}
String getBaseTableSchemaName(ConvTable convTable)
{
//We don't have to be returned a baseTableSchemaName by the system, depending on the query
if (baseTableSchemaName_ != null)
{
return convTable.byteArrayToString (baseTableSchemaName_, 0,
baseTableSchemaName_.length,bidiConversionProperties_); //@Q8C
}
else
return null;
}
String getColumnLabel(ConvTable convTable)
{
//We don't have to be returned a column label by the system, depending on the query.
//In fact, if the column label is the same as the base column name, we will not be returned
//it. If we get a base column name and not a column label, we can assume that the column
//label is the same as the base column name and return that.
if (columnLabel_ != null)
{
// If we have a column label, we already converted it based on the CCSID provided
// by the database, so don't use the converter the user passed in.
return columnLabel_;
}
// We weren't returned a column label, so try to return the base column name.
//@D9 If a alias is being used, the base column name will be different from the alias name
// We should be returning the alias name
//@D9D else if (baseColumnName_ != null)
//@D9D {
//@D9D return convTable.byteArrayToString (baseColumnName_, 0, baseColumnName_.length);
//@D9D }
// We weren't returned a column label or a base column name, so return null.
else
return null;
}
}