hdf5/c++/src/H5LaccProp.cpp

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * All rights reserved.                                                      *
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 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the LICENSE file, which can be found at the root of the source code       *
 * distribution tree, or in https://www.hdfgroup.org/licenses.               *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#include <string>

#include "H5Include.h"
#include "H5Exception.h"
#include "H5IdComponent.h"
#include "H5PropList.h"
#include "H5LaccProp.h"

namespace H5 {

#ifndef DOXYGEN_SHOULD_SKIP_THIS
// This DOXYGEN_SHOULD_SKIP_THIS block is a work-around approach to control
// the order of creation and deletion of the global constants.  See Design Notes
// in "H5PredType.cpp" for information.

// Initialize a pointer for the constant
LinkAccPropList *LinkAccPropList::DEFAULT_ = 0;

//--------------------------------------------------------------------------
// Function:    LinkAccPropList::getConstant
//              Creates a LinkAccPropList object representing the HDF5 constant
//              H5P_LINK_ACCESS, pointed to by LinkAccPropList::DEFAULT_
// exception    H5::PropListIException
// Description
//              If LinkAccPropList::DEFAULT_ already points to an allocated
//              object, throw a PropListIException.  This scenario should not
//              happen.
//--------------------------------------------------------------------------
LinkAccPropList *
LinkAccPropList::getConstant()
{
    // Tell the C library not to clean up, H5Library::termH5cpp will call
    // H5close - more dependency if use H5Library::dontAtExit()
    if (!IdComponent::H5dontAtexit_called) {
        (void)H5dont_atexit();
        IdComponent::H5dontAtexit_called = true;
    }

    // If the constant pointer is not allocated, allocate it. Otherwise,
    // throw because it shouldn't be.
    if (DEFAULT_ == 0)
        DEFAULT_ = new LinkAccPropList(H5P_LINK_ACCESS);
    else
        throw PropListIException("LinkAccPropList::getConstant",
                                 "LinkAccPropList::getConstant is being invoked on an allocated DEFAULT_");
    return (DEFAULT_);
}

//--------------------------------------------------------------------------
// Function:    LinkAccPropList::deleteConstants
// Purpose:     Deletes the constant object that LinkAccPropList::DEFAULT_
//              points to.
// exception    H5::PropListIException
//--------------------------------------------------------------------------
void
LinkAccPropList::deleteConstants()
{
    delete DEFAULT_;
}

//--------------------------------------------------------------------------
// Purpose:     Constant for default property
//--------------------------------------------------------------------------
const LinkAccPropList &LinkAccPropList::DEFAULT = *getConstant();

#endif // DOXYGEN_SHOULD_SKIP_THIS

//--------------------------------------------------------------------------
// Function:    Default Constructor
///\brief       Creates a file access property list
//--------------------------------------------------------------------------
LinkAccPropList::LinkAccPropList() : PropList(H5P_LINK_ACCESS)
{
}

//--------------------------------------------------------------------------
// Function:    LinkAccPropList copy constructor
///\brief       Copy Constructor: same HDF5 object as \a original
///\param       original - IN: LinkAccPropList instance to copy
//--------------------------------------------------------------------------
LinkAccPropList::LinkAccPropList(const LinkAccPropList &original) : PropList(original)
{
}

//--------------------------------------------------------------------------
// Function:    LinkAccPropList overloaded constructor
///\brief       Creates a file access property list using the id of an
///             existing one.
//--------------------------------------------------------------------------
LinkAccPropList::LinkAccPropList(const hid_t plist_id) : PropList(plist_id)
{
}

//--------------------------------------------------------------------------
// Function:    LinkAccPropList::setNumLinks
///\brief       Set the number of soft or user-defined link traversals allowed
///             before the library assumes it has found a cycle and aborts the
///             traversal.
///
///\exception   H5::PropListIException
//--------------------------------------------------------------------------
void
LinkAccPropList::setNumLinks(size_t nlinks) const
{
    herr_t ret_value = H5Pset_nlinks(id, nlinks);
    // Throw exception if H5Pset_nlinks returns failure
    if (ret_value < 0) {
        throw PropListIException("setNumLinks", "H5Pset_nlinks failed");
    }
}

//--------------------------------------------------------------------------
// Function:    LinkAccPropList::getNumLinks
///\brief       Gets the number of soft or user-defined links that can be
///             traversed before a failure occurs.
///
///\exception   H5::PropListIException
//--------------------------------------------------------------------------
size_t
LinkAccPropList::getNumLinks() const
{
    size_t nlinks    = 0;
    herr_t ret_value = H5Pget_nlinks(id, &nlinks);
    // Throw exception if H5Pget_nlinks returns failure
    if (ret_value < 0) {
        throw PropListIException("getNumLinks", "H5Pget_nlinks failed");
    }
    return (nlinks);
}

} // namespace H5