vgroup.cc

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// This file is part of the hdf4 data handler for the OPeNDAP data server.

// Copyright (c) 2005 OPeNDAP, Inc.
// Author: James Gallagher <jgallagher@opendap.org>
//
// This is free software; you can redistribute it and/or modify it under the
// terms of the GNU Lesser General Public License as published by the Free
// Software Foundation; either version 2.1 of the License, or (at your
// option) any later version.
//
// This software 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 Lesser General Public
// License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this software; if not, write to the Free Software Foundation,
// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
// You can contact OPeNDAP, Inc. at PO Box 112, Saunderstown, RI. 02874-0112.

// Copyright 1998, by the California Institute of Technology.
// ALL RIGHTS RESERVED. United States Government Sponsorship
// acknowledged. Any commercial use must be negotiated with the
// Office of Technology Transfer at the California Institute of
// Technology. This software may be subject to U.S. export control
// laws and regulations. By accepting this software, the user
// agrees to comply with all applicable U.S. export laws and
// regulations. User has the responsibility to obtain export
// licenses, or other export authority as may be required before
// exporting such information to foreign countries or providing
// access to foreign persons.
//
// U.S. Government Sponsorship under NASA Contract
// NAS7-1260 is acknowledged.
//
// Author: Todd.K.Karakashian@jpl.nasa.gov
//         Jake.Hamby@jpl.nasa.gov
//
// $RCSfile: vgroup.cc,v $ - classes for HDF VGROUP
//

#include "config_hdf.h"

#include <mfhdf.h>

#ifdef __POWERPC__
#undef isascii
#endif

#include <string>
#include <vector>
#include <set>
#include <algorithm>

using std::vector;
using std::set;
using std::less;

#include <hcstream.h>
#include <hdfclass.h>

#include <BESDebug.h>

static bool IsInternalVgroup(int32 fid, int32 ref);

//
// hdfistream_vgroup -- protected member functions
//

// initialize hdfistream_vgroup
void hdfistream_vgroup::_init(void)
{
    _vgroup_id = _index = _attr_index = _nattrs = 0;
    _meta = false;
    _vgroup_refs.clear();
    _recs.set = false;
    return;
}

void hdfistream_vgroup::_get_fileinfo(void)
{

    // build list ref numbers of all Vgroup's in the file
    int32 ref = -1;
    while ((ref = Vgetid(_file_id, ref)) != -1) {
        if (!IsInternalVgroup(_file_id, ref))
            _vgroup_refs.push_back(ref);
    }

    return;
}

void hdfistream_vgroup::_seek_next(void)
{
    _index++;
    if (!eos())
        _seek(_vgroup_refs[_index]);
    return;
}

void hdfistream_vgroup::_seek(const char *name)
{
    int32 ref = Vfind(_file_id, name);
    if (ref < 0)
        THROW(hcerr_vgroupfind);
    else
        _seek(ref);

    return;
}

void hdfistream_vgroup::_seek(int32 ref)
{
    if (_vgroup_id != 0)
        Vdetach(_vgroup_id);
    vector < int32 >::iterator r =
        find(_vgroup_refs.begin(), _vgroup_refs.end(), ref);
    if (r == _vgroup_refs.end())
        THROW(hcerr_vgroupfind);
    _index = r - _vgroup_refs.begin();
    if ((_vgroup_id = Vattach(_file_id, ref, "r")) < 0) {
        _vgroup_id = 0;
        THROW(hcerr_vgroupopen);
    }
    _attr_index = 0;
    _nattrs = Vnattrs(_vgroup_id);
    return;
}

string hdfistream_vgroup::_memberName(int32 ref)
{
    char mName[hdfclass::MAXSTR];
    int member_id;

    if ((member_id = Vattach(_file_id, ref, "r")) >= 0) {
        if (Vgetname(member_id, mName) < 0) {
            Vdetach(member_id);
            THROW(hcerr_vgroupopen);
        }
        Vdetach(member_id);
        return mName;
    }

    return "";
}


//
// hdfistream_vgroup -- public member functions
//

hdfistream_vgroup::hdfistream_vgroup(const string filename):hdfistream_obj
    (filename)
{
    _init();
    if (_filename.length() != 0)        // if ctor specified a null filename
        open(_filename.c_str());
    return;
}

void hdfistream_vgroup::open(const string & filename)
{
    open(filename.c_str());
    return;
}

void hdfistream_vgroup::open(const char *filename)
{
    if (_file_id != 0)
        close();
    if ((_file_id = Hopen(filename, DFACC_RDONLY, 0)) < 0)
        THROW(hcerr_openfile);
    if (Vstart(_file_id) < 0)
        THROW(hcerr_openfile);

    BESDEBUG("h4", "vgroup file opened: id=" << _file_id << endl);

    _filename = filename;
    _get_fileinfo();
    rewind();
    return;
}

void hdfistream_vgroup::close(void)
{
    BESDEBUG("h4", "vgroup file closed: id=" << _file_id << ", this: " << this << endl);

    int status;

    if (_vgroup_id != 0) {
        status = Vdetach(_vgroup_id);
        BESDEBUG("h4", "vgroup Vdetach status: " << status << ", this: " << this << endl);
    }

    if (_file_id != 0) {
        status = Vend(_file_id);
        BESDEBUG("h4", "vgroup vend status: " << status << ", this: " << this << endl);

        status = Hclose(_file_id);
        BESDEBUG("h4", "vgroup HClose status: " << status << ", this: " << this << endl);
        BESDEBUG("h4", "Error: " << HEstring((hdf_err_code_t)HEvalue(1)) << endl);
    }
    _vgroup_id = _file_id = _index = _attr_index = _nattrs = 0;
    _vgroup_refs = vector < int32 > (); // clear refs
    _recs.set = false;
    return;
}

void hdfistream_vgroup::seek(int index)
{
    if (index < 0 || index >= (int) _vgroup_refs.size())
        THROW(hcerr_range);
    _seek(_vgroup_refs[index]);
    _index = index;
    return;
}

void hdfistream_vgroup::seek_ref(int ref)
{
    _seek(ref);                 // _seek() sets _index
    return;
}

void hdfistream_vgroup::seek(const string & name)
{
    seek(name.c_str());
}

void hdfistream_vgroup::seek(const char *name)
{
    _seek(name);
    return;
}

string hdfistream_vgroup::memberName(int32 ref)
{
    string mName = _memberName(ref);
    return mName;
}


// read all Vgroup's in the stream
hdfistream_vgroup & hdfistream_vgroup::operator>>(vector < hdf_vgroup >
                                                  &hvv)
{
    for (hdf_vgroup hv; !eos();) {
        *this >> hv;
        hvv.push_back(hv);
    }
    return *this;
}

// read a Vgroup from the stream
hdfistream_vgroup & hdfistream_vgroup::operator>>(hdf_vgroup & hv)
{

    // delete any previous data in hv
    hv.tags.clear();
    hv.refs.clear();
    hv.vnames.clear();
    hv.vclass = hv.name = string();

    if (_vgroup_id == 0)
        THROW(hcerr_invstream); // no vgroup open!
    if (eos())
        return *this;

    // assign Vgroup ref
    hv.ref = _vgroup_refs[_index];
    // retrieve Vgroup attributes
    *this >> hv.attrs;
    // retrieve Vgroup name, class, number of entries
    char name[hdfclass::MAXSTR];
    char vclass[hdfclass::MAXSTR];
    int32 nentries;
    if (Vinquire(_vgroup_id, &nentries, name) < 0)
        THROW(hcerr_vgroupinfo);
    hv.name = string(name);
    if (Vgetclass(_vgroup_id, vclass) < 0)
        THROW(hcerr_vgroupinfo);
    hv.vclass = string(vclass);

    // retrieve entry tags and refs
    int32 npairs = Vntagrefs(_vgroup_id);
    hdfistream_vdata vdin(_filename);

    for (int i = 0; i < npairs; ++i) {
        int32 tag, ref;
        string vname;
        if (Vgettagref(_vgroup_id, i, &tag, &ref) < 0)
            THROW(hcerr_vgroupread);
        switch (tag) {
        case DFTAG_VH:
            if (!vdin.isInternalVdata(ref)) {
                hv.tags.push_back(tag);
                hv.refs.push_back(ref);
                hv.vnames.push_back(memberName(ref));
            }
            break;
        default:
            hv.tags.push_back(tag);
            hv.refs.push_back(ref);
            hv.vnames.push_back(memberName(ref));
        }
    }
    vdin.close();
    _seek_next();
    return *this;
}

//
// hdf_vgroup related member functions
//

bool hdf_vgroup::_ok(void) const
{

    // make sure there are tags stored in this vgroup
    if (tags.size() == 0)
        return false;

    // make sure there are refs stored in this vgroup
    if (refs.size() == 0)
        return false;

    return true;                // passed all the tests
}

bool IsInternalVgroup(int32 fid, int32 ref)
{
    // block vgroups used internally
    set < string, less < string > >reserved_names;
    reserved_names.insert("RIATTR0.0N");
    reserved_names.insert("RIG0.0");

    set < string, less < string > >reserved_classes;
    reserved_classes.insert("Attr0.0");
    reserved_classes.insert("RIATTR0.0C");
    reserved_classes.insert("DimVal0.0");
    reserved_classes.insert("DimVal0.1");
    reserved_classes.insert("CDF0.0");
    reserved_classes.insert("Var0.0");
    reserved_classes.insert("Dim0.0");
    reserved_classes.insert("UDim0.0");
    reserved_classes.insert("Data0.0");
    reserved_classes.insert("RI0.0");

    // get name, class of vgroup
    int vid;
    if ((vid = Vattach(fid, ref, "r")) < 0) {
        THROW(hcerr_vgroupopen);
    }

    char name[hdfclass::MAXSTR];
    char vclass[hdfclass::MAXSTR];
    if (Vgetname(vid, name) < 0) {
        Vdetach(vid);
        THROW(hcerr_vgroupinfo);
    }
    if (reserved_names.find(string(name)) != reserved_names.end()) {
        Vdetach(vid);
        return true;
    }

    if (Vgetclass(vid, vclass) < 0) {
        Vdetach(vid);
        THROW(hcerr_vgroupinfo);
    }

    Vdetach(vid);

    if (reserved_classes.find(string(vclass)) != reserved_classes.end())
        return true;

    return false;
}

// check to see if stream is positioned past the last attribute in the
// currently open Vgroup
bool hdfistream_vgroup::eo_attr(void) const
{
    if (_filename.length() == 0)        // no file open
        THROW(hcerr_invstream);
    if (eos() && !bos())        // if eos(), then always eo_attr()
        return true;
    else {
        return (_attr_index >= _nattrs);        // or positioned after last Vgroup attr?
    }
}

// Read all attributes in the stream
hdfistream_vgroup & hdfistream_vgroup::operator>>(vector < hdf_attr > &hav)
{
//    hav = vector<hdf_attr>0;  // reset vector
    for (hdf_attr att; !eo_attr();) {
        *this >> att;
        hav.push_back(att);
    }
    return *this;
}

// read an attribute from the stream
hdfistream_vgroup & hdfistream_vgroup::operator>>(hdf_attr & ha)
{
    // delete any previous data in ha
    ha.name = string();
    ha.values = hdf_genvec();

    if (_filename.length() == 0)        // no file open
        THROW(hcerr_invstream);
    if (eo_attr())              // if positioned past last attr, do nothing
        return *this;

    char name[hdfclass::MAXSTR];
    int32 number_type, count, size;
    if (Vattrinfo
        (_vgroup_id, _attr_index, name, &number_type, &count, &size) < 0)
        THROW(hcerr_vgroupinfo);

    // allocate a temporary C array to hold data from VSgetattr()
    char *data;
    data = new char[count * DFKNTsize(number_type)];
    if (data == 0)
        THROW(hcerr_nomemory);

    // read attribute values and store them in an hdf_genvec
    if (Vgetattr(_vgroup_id, _attr_index, data) < 0) {
        delete[]data;           // problem: clean up and throw an exception
        THROW(hcerr_vgroupinfo);
    }
    // try { // try to allocate an hdf_genvec
    if (count > 0) {
        ha.values = hdf_genvec(number_type, data, count);
        // }
        // catch(...) { // problem allocating hdf_genvec: clean up and rethrow
        //    delete []data;
        //    throw;
        // }
    }
    delete[]data;               // deallocate temporary C array

    // increment attribute index to next attribute
    ++_attr_index;
    ha.name = name;             // assign attribute name
    return *this;
}