path: root/c++/src/H5Group.cpp

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 * Copyright by The HDF Group.                                               *
 * All rights reserved.                                                      *
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 * terms governing use, modification, and redistribution, is contained in    *
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 * help@hdfgroup.org.                                                        *
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#include <iostream>
#include <string>

#include "H5Include.h"
#include "H5Exception.h"
#include "H5IdComponent.h"
#include "H5PropList.h"
#include "H5FaccProp.h"
#include "H5FcreatProp.h"
#include "H5OcreatProp.h"
#include "H5DcreatProp.h"
#include "H5DxferProp.h"
#include "H5LcreatProp.h"
#include "H5LaccProp.h"
#include "H5DaccProp.h"
#include "H5Location.h"
#include "H5Object.h"
#include "H5AbstractDs.h"
#include "H5DataSpace.h"
#include "H5DataSet.h"
#include "H5CommonFG.h"
#include "H5Attribute.h"
#include "H5Group.h"
#include "H5File.h"
#include "H5Alltypes.h"

namespace H5 {
using std::cerr;
using std::endl;

//--------------------------------------------------------------------------
// Function:    Group default constructor
///\brief       Default constructor: creates a stub Group.
//--------------------------------------------------------------------------
Group::Group() : H5Object(), CommonFG(), id(H5I_INVALID_HID)
{
}

//--------------------------------------------------------------------------
// Function:    Group copy constructor
///\brief       Copy constructor: same HDF5 object as \a original
///\param       original - IN: Original group to copy
//--------------------------------------------------------------------------
Group::Group(const Group &original) : H5Object(), CommonFG(), id(original.id)
{
    incRefCount(); // increment number of references to this id
}

//--------------------------------------------------------------------------
// Function:    Group::closeObjId
///\brief       Closes an object, which was opened with Group::getObjId
///
///\exception   H5::FileIException or H5::GroupIException
//--------------------------------------------------------------------------
void
Group::closeObjId(hid_t obj_id) const
{
    herr_t ret_value = H5Oclose(obj_id);
    if (ret_value < 0) {
        throwException("Group::closeObjId", "H5Oclose failed");
    }
}

//--------------------------------------------------------------------------
// Function:    Group::getLocId
// Purpose:     Get the id of this group
// Description
//              This function is a redefinition of CommonFG::getLocId.  It
//              is used by CommonFG member functions to get the file id.
// Deprecated:
//      Aug 18, 2016 -BMR
//              After HDFFV-9920, the Group's methods can use getId() and
//              getLocId() is kept for backward compatibility.
//--------------------------------------------------------------------------
hid_t
Group::getLocId() const
{
    return (getId());
}

//--------------------------------------------------------------------------
// Function:    Group overloaded constructor
///\brief       Creates a Group object using the id of an existing group.
///\param       existing_id - IN: Id of an existing group
//--------------------------------------------------------------------------
Group::Group(const hid_t existing_id) : H5Object(), CommonFG(), id(existing_id)
{
    incRefCount(); // increment number of references to this id
}

//--------------------------------------------------------------------------
// Function:    Group overload constructor - dereference
///\brief       Given a reference, ref, to an hdf5 group, creates a Group object
///\param       loc - IN: Specifying location referenced object is in
///\param       ref - IN: Reference pointer
///\param       ref_type - IN: Reference type - default to H5R_OBJECT
///\param       plist - IN: Property list - default to PropList::DEFAULT
///\exception   H5::ReferenceException
///\par Description
///             \c obj can be DataSet, Group, or named DataType, that
///             is a datatype that has been named by DataType::commit.
//--------------------------------------------------------------------------
Group::Group(const H5Location &loc, const void *ref, H5R_type_t ref_type, const PropList &plist)
    : H5Object(), CommonFG(), id(H5I_INVALID_HID)
{
    id = H5Location::p_dereference(loc.getId(), ref, ref_type, plist, "constructor - by dereference");
}

//--------------------------------------------------------------------------
// Function:    Group::getNumObjs
///\brief       Returns the number of objects in this group.
///\return      Number of objects
///\exception   H5::FileIException or H5::GroupIException
//--------------------------------------------------------------------------
hsize_t
Group::getNumObjs() const
{
    H5G_info_t ginfo; // Group information

    herr_t ret_value = H5Gget_info(getId(), &ginfo);
    if (ret_value < 0)
        throwException("getNumObjs", "H5Gget_info failed");
    return (ginfo.nlinks);
}

//--------------------------------------------------------------------------
// Function:    Group::getObjId
///\brief       Opens an object via object header.
///\param       obj_name - IN: Path to the object
///\param       plist    - IN: Access property list for the link pointing to
///                            the object
///\exception   H5::FileIException or H5::GroupIException
///\par Description
///             This function opens an object in a group or file, using
///             H5Oopen.  Thus, an object can be opened without knowing
///             the object's type.
//--------------------------------------------------------------------------
hid_t
Group::getObjId(const char *obj_name, const PropList &plist) const
{
    hid_t ret_value = H5Oopen(getId(), obj_name, plist.getId());
    if (ret_value < 0) {
        throwException("Group::getObjId", "H5Oopen failed");
    }
    return (ret_value);
}

//--------------------------------------------------------------------------
// Function:    Group::getObjId
///\brief       This is an overloaded member function, provided for convenience.
///             It takes a reference to a \c H5std_string for the object's name.
///\param       obj_name - IN: Path to the object
///\param       plist    - IN: Access property list for the link pointing to
///                            the object
///\exception   H5::FileIException or H5::GroupIException
//--------------------------------------------------------------------------
hid_t
Group::getObjId(const H5std_string &obj_name, const PropList &plist) const
{
    return (getObjId(obj_name.c_str(), plist));
}

//--------------------------------------------------------------------------
// Function:    Group::getId
///\brief       Get the id of this group
///\return      Group identifier
// Modification:
//      May 2008 - BMR
//              Class hierarchy is revised to address bugzilla 1068.  Class
//              AbstractDS and Attribute are moved out of H5Object.  In
//              addition, member IdComponent::id is moved into subclasses, and
//              IdComponent::getId now becomes pure virtual function.
//--------------------------------------------------------------------------
hid_t
Group::getId() const
{
    return (id);
}

#ifndef DOXYGEN_SHOULD_SKIP_THIS
//--------------------------------------------------------------------------
// Function:    Group::p_setId
///\brief       Sets the identifier of this object to a new value.
///
///\exception   H5::IdComponentException when the attempt to close the HDF5
///             object fails
// Description:
//              The underlying reference counting in the C library ensures
//              that the current valid id of this object is properly closed.
//              Then the object's id is reset to the new id.
//--------------------------------------------------------------------------
void
Group::p_setId(const hid_t new_id)
{
    // handling references to this old id
    try {
        close();
    }
    catch (Exception &close_error) {
        throwException("Group::p_setId", close_error.getDetailMsg());
    }
    // reset object's id to the given id
    id = new_id;
}
#endif // DOXYGEN_SHOULD_SKIP_THIS

//--------------------------------------------------------------------------
// Function:    Group::close
///\brief       Closes this group.
///
///\exception   H5::GroupIException
//--------------------------------------------------------------------------
void
Group::close()
{
    if (p_valid_id(id)) {
        herr_t ret_value = H5Gclose(id);
        if (ret_value < 0) {
            throwException("Group::close", "H5Gclose failed");
        }
        // reset the id
        id = H5I_INVALID_HID;
    }
}

//--------------------------------------------------------------------------
// Function:    Group::throwException
///\brief       Throws H5::GroupIException.
///\param       func_name - Name of the function where failure occurs
///\param       msg       - Message describing the failure
///\exception   H5::GroupIException
// Description
//              This function is also used in H5Location's methods so that
//              proper exception can be thrown for file or group.  The
//              "Group::" will be inserted to indicate the function called is
//              an implementation of Group.
//--------------------------------------------------------------------------
void
Group::throwException(const H5std_string &func_name, const H5std_string &msg) const
{
    H5std_string full_name = func_name;
    full_name.insert(0, "Group::");
    throw GroupIException(full_name, msg);
}

//--------------------------------------------------------------------------
// Function:    Group destructor
///\brief       Properly terminates access to this group.
// Modification
//              - Replaced resetIdComponent() with decRefCount() to use C
//              library ID reference counting mechanism - BMR, Feb 20, 2005
//              - Replaced decRefCount with close() to let the C library
//              handle the reference counting - BMR, Jun 1, 2006
//--------------------------------------------------------------------------
Group::~Group()
{
    try {
        close();
    }
    catch (Exception &close_error) {
        cerr << "Group::~Group - " << close_error.getDetailMsg() << endl;
    }
}

} // namespace H5