/* Copyright (C) 2004 - 2008  db4objects Inc.  http://www.db4o.com

This file is part of the db4o open source object database.

db4o is free software; you can redistribute it and/or modify it under
the terms of version 2 of the GNU General Public License as published
by the Free Software Foundation and as clarified by db4objects' GPL 
interpretation policy, available at
http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
Suite 350, San Mateo, CA 94403, USA.

db4o is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. */
package com.db4o.diagnostic;

import com.db4o.query.*;

/**
 * Diagnostic, if Native Query can not be run optimized.
 */
public class NativeQueryNotOptimized extends DiagnosticBase{
    
    private final Predicate _predicate;
    private final Exception _details;
    
    public NativeQueryNotOptimized(Predicate predicate, Exception details) {
        _predicate = predicate;
        _details = details;
    }

    public Object reason() {
    	if (_details == null) return _predicate;
    	return _predicate != null ? _predicate.toString() : ""  + "\n" + _details.getMessage();
    }

    public String problem() {
        return "Native Query Predicate could not be run optimized";
    }

    public String solution() {
        return "This Native Query was run by instantiating all objects of the candidate class. "
        + "Consider simplifying the expression in the Native Query method. If you feel that "
        + "the Native Query processor should understand your code better, you are invited to "
        + "post yout query code to db4o forums at http://developer.db4o.com/forums";
    }

}
