path: root/c++/src/H5Object.cpp

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

#include <string>

#include "H5private.h"          // for HDmemset
#include "H5Include.h"
#include "H5Exception.h"
#include "H5IdComponent.h"
#include "H5PropList.h"
#include "H5DataSpace.h"
#include "H5AbstractDs.h"
#include "H5LaccProp.h"
#include "H5Location.h"
#include "H5Attribute.h"
#include "H5Object.h"
#include "H5DataType.h"

namespace H5 {

#ifndef DOXYGEN_SHOULD_SKIP_THIS
// userAttrOpWrpr simply interfaces between the user's function and the
// C library function H5Aiterate2; used to resolve the different prototype
// problem.  May be moved to Iterator later.
 /* extern "C" herr_t userAttrOpWrpr(hid_t loc_id, const char *attr_name,
    const H5A_info_t *ainfo, void *op_data)
{
    H5std_string s_attr_name = H5std_string(attr_name);
#ifdef NO_STATIC_CAST
    UserData4Aiterate* myData = (UserData4Aiterate *) op_data;
#else
    UserData4Aiterate* myData = static_cast <UserData4Aiterate *> (op_data);
#endif
    myData->op(*myData->location, s_attr_name, myData->opData);
    return 0;
}
 */ 

//--------------------------------------------------------------------------
// Function:    H5Object default constructor (protected)
// Programmer   Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
H5Object::H5Object() : H5Location() {}

//--------------------------------------------------------------------------
// Function:    H5Object overloaded constructor (protected)
// Purpose      Creates an H5Object object using the id of an existing HDF5
//              object.
// Parameters   object_id - IN: Id of an existing HDF5 object
// Programmer   Binh-Minh Ribler - 2000
// *** Deprecation warning ***
// This constructor is no longer appropriate because the data member "id" had
// been moved to the sub-classes.  It will be removed in 1.10 release.  If its
// removal does not raise any problems in 1.10, it will be removed from 1.8 in
// subsequent releases.
// Removed in 1.8.18 and 1.10.1 - Aug 2016
//--------------------------------------------------------------------------
//H5Object::H5Object(const hid_t object_id) : H5Location() {}

//--------------------------------------------------------------------------
// Function:    H5Object copy constructor
///\brief       Copy constructor: makes a copy of the original H5Object
///             instance.
///\param       original - IN: H5Object instance to copy
// Programmer   Binh-Minh Ribler - 2000
// *** Deprecation warning ***
// This constructor is no longer appropriate because the data member "id" had
// been moved to the sub-classes.  It is removed from 1.8.15 because it is
// a noop and it can be generated by the compiler if needed.
//--------------------------------------------------------------------------
// H5Object::H5Object(const H5Object& original) : H5Location() {}

/***************************************************************************
                           Notes for H5A wrappers
                           ======================
May, 2017 (1.8.19)
        These H5A wrappers are copied from H5Location to prevent an attribute
        id being passed in to H5A APIs.  The original H5A wrapper functions
        in H5Location will be deprecated in future releases.

***************************************************************************/

//--------------------------------------------------------------------------
// Function:    H5Object::createAttribute
///\brief       Creates an attribute for a group, dataset, or named datatype.
///\param       name - IN: Name of the attribute
///\param       data_type - IN: Datatype for the attribute
///\param       data_space - IN: Dataspace for the attribute - only simple
///             dataspaces are allowed at this time
///\param       create_plist - IN: Creation property list - default to
///             PropList::DEFAULT
///\return      Attribute instance
///\exception   H5::AttributeIException
///\par Description
///             The attribute name specified in \a name must be unique.
///             Attempting to create an attribute with the same name as an
///             existing attribute will raise an exception, leaving the
///             pre-existing attribute intact. To overwrite an existing
///             attribute with a new attribute of the same name, first
///             delete the existing one with \c H5Object::removeAttr, then
///             recreate it with this function.
// Programmer   Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
Attribute H5Object::createAttribute(const char* name, const DataType& data_type, const DataSpace& data_space, const PropList& create_plist) const
{
    hid_t type_id = data_type.getId();
    hid_t space_id = data_space.getId();
    hid_t plist_id = create_plist.getId();
    hid_t attr_id = H5Acreate2(getId(), name, type_id, space_id, plist_id, H5P_DEFAULT);

    // If the attribute id is valid, create and return the Attribute object
    if (attr_id > 0)
    {
        Attribute attr;
        f_Attribute_setId(&attr, attr_id);
        return(attr);
    }
    else
        throw AttributeIException(inMemFunc("createAttribute"), "H5Acreate2 failed");
}

//--------------------------------------------------------------------------
// Function:    H5Object::createAttribute
///\brief       This is an overloaded member function, provided for convenience.
///             It differs from the above function in that it takes
///             a reference to an \c H5std_string for \a name.
// Programmer   Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
Attribute H5Object::createAttribute(const H5std_string& name, const DataType& data_type, const DataSpace& data_space, const PropList& create_plist) const
{
    return(createAttribute(name.c_str(), data_type, data_space, create_plist));
}

//--------------------------------------------------------------------------
// Function:    H5Object::openAttribute
///\brief       Opens an attribute given its name.
///\param       name - IN: Name of the attribute
///\return      Attribute instance
///\exception   H5::AttributeIException
// Programmer   Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
Attribute H5Object::openAttribute(const char* name) const
{
    hid_t attr_id = H5Aopen(getId(), name, H5P_DEFAULT);
    if (attr_id > 0)
    {
        Attribute attr;
        f_Attribute_setId(&attr, attr_id);
        return(attr);
    }
    else
    {
        throw AttributeIException(inMemFunc("openAttribute"), "H5Aopen failed");
    }
}

//--------------------------------------------------------------------------
// Function:    H5Object::openAttribute
///\brief       This is an overloaded member function, provided for convenience.
///             It differs from the above function in that it takes
///             a reference to an \c H5std_string for \a name.
// Programmer   Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
Attribute H5Object::openAttribute(const H5std_string& name) const
{
    return(openAttribute(name.c_str()));
}

//--------------------------------------------------------------------------
// Function:    H5Object::openAttribute
///\brief       Opens an attribute given its index.
///\param       idx - IN: Index of the attribute, a 0-based, non-negative integer
///\return      Attribute instance
///\exception   H5::AttributeIException
// Programmer   Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
Attribute H5Object::openAttribute(const unsigned int idx) const
{
    hid_t attr_id = H5Aopen_by_idx(getId(), ".", H5_INDEX_CRT_ORDER,
              H5_ITER_INC, static_cast<hsize_t>(idx), H5P_DEFAULT, H5P_DEFAULT);
    if (attr_id > 0)
    {
        Attribute attr;
        f_Attribute_setId(&attr, attr_id);
        return(attr);
    }
    else
    {
        throw AttributeIException(inMemFunc("openAttribute"), "H5Aopen_by_idx failed");
    }
}

//--------------------------------------------------------------------------
// Function:    H5Object::attrExists
///\brief       Checks whether the named attribute exists at this location.
///\param       name - IN: Name of the attribute to be queried
///\exception   H5::AttributeIException
// Programmer   Binh-Minh Ribler - 2013
//--------------------------------------------------------------------------
bool H5Object::attrExists(const char* name) const
{
    // Call C routine H5Aexists to determine whether an attribute exists
    // at this location, which could be specified by a file, group, dataset,
    // or named datatype.
    herr_t ret_value = H5Aexists(getId(), name);
    if(ret_value > 0)
        return true;
    else if(ret_value == 0)
        return false;
    else // Raise exception when H5Aexists returns a negative value
        throw AttributeIException(inMemFunc("attrExists"), "H5Aexists failed");
}

//--------------------------------------------------------------------------
// Function:    H5Object::attrExists
///\brief       This is an overloaded member function, provided for convenience.
///             It differs from the above function in that it takes
///             a reference to an \c H5std_string for \a name.
// Programmer   Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
bool H5Object::attrExists(const H5std_string& name) const
{
    return(attrExists(name.c_str()));
}

//--------------------------------------------------------------------------
// Function:    H5Object::removeAttr
///\brief       Removes the named attribute from this object.
///\param       name - IN: Name of the attribute to be removed
///\exception   H5::AttributeIException
// Programmer   Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
void H5Object::removeAttr(const char* name) const
{
    herr_t ret_value = H5Adelete(getId(), name);
    if(ret_value < 0)
        throw AttributeIException(inMemFunc("removeAttr"), "H5Adelete failed");
}

//--------------------------------------------------------------------------
// Function:    H5Object::removeAttr
///\brief       This is an overloaded member function, provided for convenience.
///             It differs from the above function in that it takes
///             a reference to an \c H5std_string for \a name.
// Programmer   Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
void H5Object::removeAttr(const H5std_string& name) const
{
    removeAttr(name.c_str());
}

//--------------------------------------------------------------------------
// Function:    H5Object::renameAttr
///\brief       Renames the named attribute from this object.
///\param       oldname - IN: Name of the attribute to be renamed
///\param       newname - IN: New name ame of the attribute
///\exception   H5::AttributeIException
// Programmer   Binh-Minh Ribler - Mar, 2005
//--------------------------------------------------------------------------
void H5Object::renameAttr(const char* oldname, const char* newname) const
{
    herr_t ret_value = H5Arename(getId(), oldname, newname);
    if (ret_value < 0)
        throw AttributeIException(inMemFunc("renameAttr"), "H5Arename failed");
}

//--------------------------------------------------------------------------
// Function:    H5Object::renameAttr
///\brief       This is an overloaded member function, provided for convenience.
///             It differs from the above function in that it takes
///             a reference to an \c H5std_string for the names.
// Programmer   Binh-Minh Ribler - Mar, 2005
//--------------------------------------------------------------------------
void H5Object::renameAttr(const H5std_string& oldname, const H5std_string& newname) const
{
   renameAttr (oldname.c_str(), newname.c_str());
}

// end of Notes for H5A wrappers

//--------------------------------------------------------------------------
// Function:    H5Object::getNumAttrs
///\brief       Returns the number of attributes attached to this HDF5 object.
///\return      Number of attributes
///\exception   H5::AttributeIException
// Programmer   Binh-Minh Ribler - 2000
// Modification
//          - Moved from H5Location in 1.8.20. -BMR Oct, 2017
//--------------------------------------------------------------------------
int H5Object::getNumAttrs() const
{
   H5O_info_t oinfo;    /* Object info */

    if(H5Oget_info(getId(), &oinfo) < 0)
        throw AttributeIException(inMemFunc("getNumAttrs"), "H5Oget_info failed");
    else
        return(static_cast<int>(oinfo.num_attrs));
}

//--------------------------------------------------------------------------
// Function:    getObjName
///\brief       Given an id, returns the type of the object.
///\return      The name of the object
// Programmer   Binh-Minh Ribler - Mar, 2014
//--------------------------------------------------------------------------
ssize_t H5Object::getObjName(char *obj_name, size_t buf_size) const
{
    // H5Iget_name will get buf_size-1 chars of the name to null terminate it
    ssize_t name_size = H5Iget_name(getId(), obj_name, buf_size);

    // If H5Iget_name returns a negative value, raise an exception
    if (name_size < 0)
    {
        throw Exception(inMemFunc("getObjName"), "H5Iget_name failed");
    }
    else if (name_size == 0)
    {
        throw Exception(inMemFunc("getObjName"), "Object must have a name, but name length is 0");
    }
    // Return length of the name
    return(name_size);
}

//--------------------------------------------------------------------------
// Function:    H5Object::getObjName
///\brief       Returns the name of this object as an \a H5std_string.
///\return      Name of the object
///\exception   H5::Exception
// Programmer   Binh-Minh Ribler - Mar, 2014
// Modification
//--------------------------------------------------------------------------
H5std_string H5Object::getObjName() const
{
    H5std_string obj_name(""); // object name to return

    // Preliminary call to get the size of the object name
    ssize_t name_size = H5Iget_name(getId(), NULL, static_cast<size_t>(0));

    // If H5Iget_name failed, throw exception
    if (name_size < 0)
    {
        throw Exception(inMemFunc("getObjName"), "H5Iget_name failed");
    }
    else if (name_size == 0)
    {
        throw Exception(inMemFunc("getObjName"), "Object must have a name, but name length is 0");
    }
    // Object's name exists, retrieve it
    else if (name_size > 0)
    {
        char* name_C = new char[name_size+1];  // temporary C-string
        HDmemset(name_C, 0, name_size+1); // clear buffer

        // Use overloaded function
        name_size = getObjName(name_C, name_size+1);

        // Convert the C object name to return
        obj_name = name_C;

        // Clean up resource
        delete []name_C;
    }
    // Return object's name
    return(obj_name);
}

//--------------------------------------------------------------------------
// Function:    H5Object::getObjName
///\brief       Gets the name of this object, returning its length.
///\param       obj_name - OUT: Buffer for the name string as \a H5std_string
///\param       len  -  IN: Desired length of the name, default to 0
///\return      Actual length of the object name
///\exception   H5::Exception
///\par Description
///             This function retrieves the object's name as an std string.
///             buf_size can specify a specific length or default to 0, in
///             which case the entire name will be retrieved.
// Programmer   Binh-Minh Ribler - Mar, 2014
//--------------------------------------------------------------------------
ssize_t H5Object::getObjName(H5std_string& obj_name, size_t len) const
{
    ssize_t name_size = 0;

    // If no length is provided, get the entire object name
    if (len == 0)
    {
        obj_name = getObjName();
        name_size = obj_name.length();
    }
    // If length is provided, get that number of characters in name
    else
    {
        char* name_C = new char[len+1];  // temporary C-string
        HDmemset(name_C, 0, len+1); // clear buffer

        // Use overloaded function
        name_size = getObjName(name_C, len+1);

        // Convert the C object name to return
        obj_name = name_C;

        // Clean up resource
        delete []name_C;
    }
    // Otherwise, keep obj_name intact

    // Return name size
    return(name_size);
}

//--------------------------------------------------------------------------
// Function:    H5Object destructor
///\brief       Noop destructor.
// Programmer   Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
H5Object::~H5Object() {}
#endif // DOXYGEN_SHOULD_SKIP_THIS

} // end namespace