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///////////////////////////////////////////////////////////////////////////////
//                                                                             
// JTOpen (IBM Toolbox for Java - OSS version)                              
//                                                                             
// Filename: IFSLookupRep.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) 2016-2016 International Business Machines Corporation and     
// others. All rights reserved.                                                
//                                                                             
///////////////////////////////////////////////////////////////////////////////

package com.ibm.as400.access;

import java.io.UnsupportedEncodingException;

/**
 * Create Working Directory Handle reply.
 **/
class IFSLookupRep extends IFSDataStream
{
    private static final String copyright = "Copyright (C) 2004-2004 International Business Machines Corporation and others.";

    private static final int LLCP_LENGTH = 6;

    private static final int TEMPLATE_LENGTH_OFFSET = 16;
    private static final int OBJECT_HANDLE_OFFSET = 22;

    static final int OA_NONE = IFSLookupReq.OA_NONE;
    static final int OA1 = IFSLookupReq.OA1;
    static final int OA2 = IFSLookupReq.OA2;

    /**
     * Get object handle.
     * 
     * @return the object handle.
     **/
    int getHandle() {
        return get32bit(OBJECT_HANDLE_OFFSET);
    }

    /**
     * Get ASP number
     * 
     * @return the ASP number
     * @throws UnsupportedEncodingException If the Character Encoding is not supported.
     */
    int getASP() throws UnsupportedEncodingException {
        return new IFSObjAttrs1(getObjAttrBytes(OA1)).getASP();
    }

    int getCCSID(int datastreamLevel) {
        return new IFSObjAttrs2(getObjAttrBytes(OA2)).getCCSID(datastreamLevel);
    }

    String getOwnerName(int systemCcsid) throws UnsupportedEncodingException {
        return new IFSObjAttrs1(getObjAttrBytes(OA1)).getOwnerName(systemCcsid);
    }

    /**
     * Generate a new instance of this type.
     * 
     * @return a reference to the new instance
     **/
    @Override
    public Object getNewDataStream() {
        return new IFSLookupRep();
    }

    /**
     * Generates a hash code for this data stream.
     * 
     * @return the hash code
     **/
    @Override
    public int hashCode() {
        return 0x800C;
    }
  
    private final byte[] getObjAttrBytes(int type)
    {
        if (type == OA_NONE)
            return null;

        // Find the first OA structure in the reply's "Optional/Variable Section".
        int offset = HEADER_LENGTH + get16bit(TEMPLATE_LENGTH_OFFSET);
        int oaCodePoint = (type == OA1 ? 0x0010 : 0x000F); // OA1: CP == 0x0010; OA2: CP == 0x000F
        byte[] buf = null;
        
        while (buf == null && offset < data_.length)
        {
            // Look for an LLCP with a CP value that specifies an OA* structure.
            int length = get32bit(offset); // Get the LL value.
            short codePoint = (short) get16bit(offset + 4); // Get the CP value.
            if (codePoint == oaCodePoint) 
            {
                // We found an OA* of the desired type.
                int OAlength = length - LLCP_LENGTH; // Exclude the LLCP.
                buf = new byte[OAlength];
                System.arraycopy(data_, offset + LLCP_LENGTH, buf, 0, OAlength);
            } 
            else 
            { 
                // not what we're looking for, so keep looking
                offset += length; // skip to next LLCP
            }
        }

        if (buf == null) {
            Trace.log(Trace.ERROR, "The reply does not contain an OA" + type + " structure.");
            throw new InternalErrorException(InternalErrorException.UNKNOWN);
        }

        return buf;
    }
}