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BUG#: 5314
TITLE: IPC Refactoring

DESCRIPTION: This patch cleans up the IPC related classes. It (1) reorganizes
related classes into their own headers, (2) makes the mutex class recursive to
eliminate recursive lock exclusion logic, (3) reimplements condition variables,
renames dozens of global functions.

//%2006////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
// Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
// Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation, The Open Group.
// Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; Symantec Corporation; The Open Group.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
// ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
// "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//==============================================================================
//
// Author: Humberto Rivero (hurivero@us.ibm.com)
//
// Modified By: David Dillard, VERITAS Software Corp.
//                  (david.dillard@veritas.com)
//              Josephine Eskaline Joyce (jojustin@in.ibm.com) for PEP#101
//
//%/////////////////////////////////////////////////////////////////////////////

#include "CQLParser.h"
#include "CQLParserState.h"
#include <Pegasus/Common/InternalException.h>
#include <Pegasus/Common/Mutex.h>
#include <Pegasus/Query/QueryCommon/QueryException.h>
#include <Pegasus/Common/Tracer.h>
#include <Pegasus/Common/PegasusVersion.h>

PEGASUS_USING_STD;

extern int CQL_parse();
extern void CQL_restart (FILE *input_file);
extern void CQL_Bison_Cleanup();

PEGASUS_NAMESPACE_BEGIN

CQLParserState* CQL_globalParserState = 0;
static Mutex CQL_mutex;

void CQLParser::parse(
    const char* text,
    CQLSelectStatement& statement)
{
    PEG_METHOD_ENTER(TRC_CQL,"CQLParser::parse");

    AutoMutex mtx(CQL_mutex);

    if (!text)
    {
        PEG_METHOD_EXIT();
        throw NullPointer();
    }

    statement.clear();
    CQL_restart (0);

    CQL_globalParserState = new CQLParserState;
    CQL_globalParserState->error = false;
    CQL_globalParserState->text = text;
    CQL_globalParserState->textSize = strlen(text) + 1;
    CQL_globalParserState->offset = 0;
    CQL_globalParserState->currentTokenPos = 0;
    CQL_globalParserState->tokenCount = 0;
    CQL_globalParserState->currentRule = String::EMPTY;
    CQL_globalParserState->statement = &statement;

    try
    {
        CQL_parse();
    }
    catch(...)
    {
        CQL_Bison_Cleanup();
        PEG_METHOD_EXIT();
        throw;
    }

    if (CQL_globalParserState->error)
    {
        String errorMessage = CQL_globalParserState->errorMessage;
        cleanup();
        Uint32 position = CQL_globalParserState->currentTokenPos;
        Uint32 token = CQL_globalParserState->tokenCount;
        String rule = CQL_globalParserState->currentRule;
        delete CQL_globalParserState;
        PEG_METHOD_EXIT();
        throw CQLSyntaxErrorException(errorMessage,token,position,rule);
    }

    cleanup();
    delete CQL_globalParserState;
    PEG_METHOD_EXIT();
}

void CQLParser::parse(
    const Buffer& text,
    CQLSelectStatement& statement)
{
    PEG_METHOD_ENTER(TRC_CQL,"CQLParser::parse");

    if (text.size() == 0 || text[text.size() - 1] != '\0')
    {
        PEG_METHOD_EXIT();
        throw MissingNullTerminator();
    }

    parse(text.getData(), statement);
    PEG_METHOD_EXIT();
}

void CQLParser::parse(
    const String& text,
    CQLSelectStatement& statement)
{
    PEG_METHOD_ENTER(TRC_CQL,"CQLParser::parse");

    parse(text.getCString(), statement);

    PEG_METHOD_EXIT();
}

void CQLParser::cleanup()
{
    PEG_METHOD_ENTER(TRC_CQL,"CQLParser::cleanup");


    Array<char*>& arr = CQL_globalParserState->outstandingStrings;

    for (Uint32 i = 0, n = arr.size(); i < n; i++)
        delete [] arr[i];

    arr.clear();

    PEG_METHOD_EXIT();
}

PEGASUS_NAMESPACE_END

PEGASUS_USING_PEGASUS;

int CQL_error(const char* errorMessage)
{
    PEG_METHOD_ENTER(TRC_CQL,"CQL_error");
    CQL_globalParserState->error = true;
    CQL_globalParserState->errorMessage = errorMessage;

    //
    //  flex does not automatically flush the input buffer in case of error
    //
    CQL_restart (0);

    PEG_METHOD_EXIT();
    return -1;
}

int CQLInput(char* buffer, int& numRead, int numRequested)
{
    PEG_METHOD_ENTER(TRC_CQL,"CQLInput");
    //
    // Be sure to account for the null terminator (the size of the text will
    // be one or more; this is fixed checked beforehand by CQLParser::parse()).
    //
    int remaining =
        CQL_globalParserState->textSize - CQL_globalParserState->offset - 1;

    if (remaining == 0)
    {
        numRead = 0;
        PEG_METHOD_EXIT();
        return 0;
    }

    if (remaining < numRequested)
        numRequested = remaining;

    memcpy(buffer,
        CQL_globalParserState->text + CQL_globalParserState->offset,
        numRequested);

    CQL_globalParserState->offset += numRequested;
    numRead = numRequested;


    PEG_METHOD_EXIT();
    return numRead;
}