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Diff for /pegasus/src/Pegasus/WQL/WQLParser.h between version 1.1 and 1.1.2.6

version 1.1, 2001/11/30 02:53:56

version 1.1.2.6, 2001/12/07 00:37:56

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//%/////////////////////////////////////////////////////////////////////////////

// The Open Group, Tivoli Systems

// 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: Mike Brasher (mbrasher@bmc.com)

// Modified By:

//%/////////////////////////////////////////////////////////////////////////////

#ifndef Pegasus_WQLParser_h

#define Pegasus_WQLParser_h

#include <Pegasus/Common/Config.h>

#include <Pegasus/Common/Array.h>

#include <Pegasus/WQL/Linkage.h>

#include <Pegasus/WQL/WQLSelectStatement.h>

PEGASUS_NAMESPACE_BEGIN

/** This class provides the parser interface for the WQL parser.

Here is an example of how to parse a SELECT statement using this

class:

<pre>

const char TEXT[] = "SELECT X,Y FROM MyClass WEHERE X > 10 AND Y < 3";

Array<Sint8> text(TEXT, sizeof(TEXT));

WQLSelectStatement selectStatement;

WQLParser parser;

try

{

parser.parse(text, selectStatement);

}

catch (ParseError&)

{

...

}

catch (MissingNullTerminator&)

{

...

}

</pre>

NOTE: the text must be NULL terminated or else the MissingNullTerminator

exception is thrown.

class PEGASUS_WQL_LINKAGE WQLParser

{

public:

/** Parse the SELECT statement given by the text parameter and initialize

the statement parameter accordingly.

Please note that this method is not thread safe. It must be guarded

with mutexes by the caller.

@param text null terminated array of characters containing a SELECT

statement.

@param statement object which holds the compiled version of the SELECT

statement upon return.

@exception throws ParseError if text is not a valid SELECT statement.

@exception throws MissingNullTerminator if text argument is not

terminated with a null.

static void parse(

const Array<Sint8>& text,

WQLSelectStatement& statement);

private:

/** This method cleans up all the strings which were created by LEX and

passed to YACC. These strings cannot be cleaned up by YACC actions

since the actions that clean up certain strings are not always reached

when errors occur.

static void cleanup();

/** Private constructor to avoid user from creating instance of this class.

WQLParser() { }

};

PEGASUS_NAMESPACE_END

#endif /* Pegasus_WQLParser_h */

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