Str.h

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00001 
00002 // -*- mode: c++; c-basic-offset:4 -*-
00003 
00004 // This file is part of libdap, A C++ implementation of the OPeNDAP Data
00005 // Access Protocol.
00006 
00007 // Copyright (c) 2002,2003 OPeNDAP, Inc.
00008 // Author: James Gallagher <jgallagher@opendap.org>
00009 //
00010 // This library is free software; you can redistribute it and/or
00011 // modify it under the terms of the GNU Lesser General Public
00012 // License as published by the Free Software Foundation; either
00013 // version 2.1 of the License, or (at your option) any later version.
00014 //
00015 // This library is distributed in the hope that it will be useful,
00016 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018 // Lesser General Public License for more details.
00019 //
00020 // You should have received a copy of the GNU Lesser General Public
00021 // License along with this library; if not, write to the Free Software
00022 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00023 //
00024 // You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.
00025 
00026 // (c) COPYRIGHT URI/MIT 1995-1999
00027 // Please read the full copyright statement in the file COPYRIGHT_URI.
00028 //
00029 // Authors:
00030 //      jhrg,jimg       James Gallagher <jgallagher@gso.uri.edu>
00031 
00032 // Interface for Str type.
00033 //
00034 // jhrg 9/7/94
00035 
00036 #ifndef _str_h
00037 #define _str_h 1
00038 
00039 #include <string>
00040 
00041 #include "dods-limits.h"
00042 #include "BaseType.h"
00043 
00044 // max_str_len should be large since we always send strings with length bytes
00045 // as a prefix (so xdr_string will always know how much memory to malloc) but
00046 // if deserialize gets confused and thinks a ctor (in particular) is a string
00047 // xdr_string in turn will max_str_len if it cannot get a length byte. A long
00048 // term solution is to fix libdap, but strings should not routinely be > 32k
00049 // for the time being... jhrg 4/30/97
00050 
00051 const unsigned int max_str_len = DODS_USHRT_MAX - 1;
00052 
00059 class Str: public BaseType
00060 {
00061 
00062 protected:
00063     string _buf;
00064 
00065 public:
00066     Str(const string &n = "");
00067 
00068     virtual ~Str()
00069     {}
00070 
00071     Str(const Str &copy_from);
00072 
00073     Str &operator=(const Str &rhs);
00074 
00075     virtual BaseType *ptr_duplicate();
00076 
00077     virtual unsigned int width();
00078 
00079     // Return the length of the stored string or zero if no string has been
00080     // stored in the instance's internal buffer.
00081     unsigned int length();
00082 
00083     virtual bool serialize(const string &dataset, ConstraintEvaluator &eval,
00084                            DDS &dds, Marshaller &m, bool ce_eval = true);
00085     virtual bool deserialize(UnMarshaller &um, DDS *dds, bool reuse = false);
00086 
00087     virtual unsigned int val2buf(void *val, bool reuse = false);
00088     virtual unsigned int buf2val(void **val);
00089 
00090     virtual bool set_value(const string &value);
00091     virtual string value() const;
00092 
00093     virtual void print_val(FILE *out, string space = "",
00094                            bool print_decl_p = true);
00095     virtual void print_val(ostream &out, string space = "",
00096                            bool print_decl_p = true);
00097 
00098     virtual bool ops(BaseType *b, int op, const string &dataset);
00099 
00100     virtual void dump(ostream &strm) const ;
00101 };
00102 
00103 #endif // _str_h
00104 

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