path: root/c++/src/H5File.cpp

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  * Copyright by the Board of Trustees of the University of Illinois.         *
  * All rights reserved.                                                      *
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#include <string>
#ifdef OLD_HEADER_FILENAME
#include <iostream.h>
#else
#include <iostream>
#endif

#include "H5Include.h"
#include "H5Exception.h"
#include "H5IdComponent.h"
#include "H5PropList.h"
#include "H5Object.h"
#include "H5FaccProp.h"
#include "H5FcreatProp.h"
#include "H5DxferProp.h"
#include "H5DcreatProp.h"
#include "H5CommonFG.h"
#include "H5Group.h"
#include "H5AbstractDs.h"
#include "H5DataSpace.h"
#include "H5DataSet.h"
#include "H5File.h"
#include "H5Alltypes.h"

#ifndef H5_NO_NAMESPACE
namespace H5 {
#endif

//--------------------------------------------------------------------------
// Function	Default constructor
///\brief	Default constructor - Creates a stub hdf5 file object.
///\par Description
///		The id of this hdf5 file is set to 0.
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
H5File::H5File() : IdComponent() {}

//--------------------------------------------------------------------------
// Function:	H5File overloaded constructor
///\brief	Creates or opens an HDF5 file depending on the parameter flags.
///\param	name - IN: Name of the file
///\param	flags - IN: File access flags
///\param	create_plist - IN: File creation property list, used when 
///		modifying default file meta-data.  Default to 
///		FileCreatPropList::DEFAULT
///\param	access_plist - IN: File access property list.  Default to 
///		FileCreatPropList::DEFAULT
///\par Description
///		Valid values of \a flags include:
///		\li \c H5F_ACC_TRUNC - Truncate file, if it already exists, 
///				       erasing all data previously stored in 
///				       the file. 
///		\li \c H5F_ACC_EXCL - Fail if file already exists. 
///			\c H5F_ACC_TRUNC and \c H5F_ACC_EXCL are mutually exclusive
///		\li \c H5F_ACC_DEBUG - print debug information. This flag is 
///			used only by HDF5 library developers; it is neither 
///			tested nor supported for use in applications. 
///\par
///		For info on file creation in the case of an already-open file,
///		please refer to the \b Special \b case section in the C layer
///		Reference Manual at:
/// http://hdf.ncsa.uiuc.edu/HDF5/doc/RM_H5F.html#File-Create
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
H5File::H5File( const string& name, unsigned int flags, const FileCreatPropList& create_plist, const FileAccPropList& access_plist ) : IdComponent()
{
   p_get_file( name.c_str(), flags, create_plist, access_plist );
}

//--------------------------------------------------------------------------
// Function:	H5File overloaded constructor
///\brief	This is another overloaded constructor.  It differs from the 
///		above constructor only in the type of the \a name argument.
///\param	name - IN: Name of the file
///\param	flags - IN: File access flags
///\param	create_plist - IN: File creation property list, used when 
///		modifying default file meta-data.  Default to 
///		FileCreatPropList::DEFAULT
///\param	access_plist - IN: File access property list.  Default to 
///		FileCreatPropList::DEFAULT
///\param	name - IN: Name of the file - \c std::string
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
H5File::H5File( const char* name, unsigned int flags, const FileCreatPropList& create_plist, const FileAccPropList& access_plist ) : IdComponent()
{
   p_get_file( name, flags, create_plist, access_plist );
}

//--------------------------------------------------------------------------
// This function is private and contains common code between the 
// constructors taking a string or a char*
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
void H5File::p_get_file( const char* name, unsigned int flags, const FileCreatPropList& create_plist, const FileAccPropList& access_plist )
{
    // These bits only set for creation, so if any of them are set,
    // create the file.
    if( flags & (H5F_ACC_EXCL|H5F_ACC_TRUNC|H5F_ACC_DEBUG ))
    {
	hid_t create_plist_id = create_plist.getId();
	hid_t access_plist_id = access_plist.getId();
	id = H5Fcreate( name, flags, create_plist_id, access_plist_id );
	if( id <= 0 )  // throw an exception when open/create fail
	{
	    throw FileIException("H5File constructor", "H5Fcreate failed");
	}
    }
    // Open the file if none of the bits above are set.
    else
    {
	// use create_plist for access plist because of the default argument
	hid_t access_plist_id = create_plist.getId();
	id = H5Fopen( name, flags, access_plist_id );
	if( id <= 0 )  // throw an exception when open/create fail
	{
	    throw FileIException("H5File constructor", "H5Fopen failed");
	}
    }
}

//--------------------------------------------------------------------------
// Function:	Copy Constructor
///\brief	Copy Constructor: Makes a copy of the original
///		H5File object
///\param	original - IN: H5File instance to copy
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
H5File::H5File( const H5File& original ) : IdComponent( original ) {}

//--------------------------------------------------------------------------
// Function:	H5File::isHdf5
///\brief	Determines whether a file in HDF5 format
///\param	name - IN: Name of the file
///\return	true if the file is in HDF5 format, and false, otherwise
///\exception	H5::FileIException
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
bool H5File::isHdf5(const char* name ) 
{
   // Calls C routine H5Fis_hdf5 to determine whether the file is in 
   // HDF5 format.  It returns positive value, 0, or negative value
   htri_t ret_value = H5Fis_hdf5( name );
   if( ret_value > 0 )
      return true;
   else if( ret_value == 0 )
      return false;
   else // Raise exception when H5Fis_hdf5 returns a negative value 
   {
      throw FileIException("H5File::isHdf5", "H5Fis_hdf5 returned negative value");
   }
}
//--------------------------------------------------------------------------
// Function:	H5File::isHdf5
///\brief	This is an overloaded member function, provided for convenience.
///		It takes an \c std::string for \a name.
///\param	name - IN: Name of the file
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
bool H5File::isHdf5(const string& name ) 
{
   return( isHdf5( name.c_str()) );
}

//--------------------------------------------------------------------------
// Function:	H5File::reopen
///\brief	Reopens this file
///\exception	H5::FileIException
// Description
//		If this object has represented another HDF5 file, the previous
//		HDF5 file need to be closed first.
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
void H5File::reopen()
{
   // reset the identifier of this H5File - send 'this' in so that
   // H5Fclose can be called appropriately
    try {
        decRefCount();
    }
    catch (Exception close_error) {
        throw FileIException("H5File::reopen", close_error.getDetailMsg());
    }

   // call C routine to reopen the file - Note: not sure about this
   // does id need to be closed later?  which id to be the parameter?
   id = H5Freopen( id );
   if( id <= 0 ) // Raise exception when H5Freopen returns a neg value
      throw FileIException("H5File::reopen", "H5Freopen failed");
}

//--------------------------------------------------------------------------
// Function:	H5File::getCreatePlist
///\brief	Returns the creation property list of this file
///\return	FileCreatPropList object
///\exception	H5::FileIException
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
FileCreatPropList H5File::getCreatePlist() const
{
   hid_t create_plist_id = H5Fget_create_plist( id );

   // if H5Fget_create_plist returns a valid id, create and return
   // the FileCreatPropList object for this property list
   if( create_plist_id > 0 )
   {
      FileCreatPropList create_plist( create_plist_id );
      return( create_plist );
   }
   else
   {
      throw FileIException("H5File::getCreatePlist", "H5Fget_create_plist failed");
   }
}

//--------------------------------------------------------------------------
// Function:	H5File::getAccessPlist
///\brief	Returns the access property list of this file
///\return	FileAccPropList object
///\exception	H5::FileIException
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
FileAccPropList H5File::getAccessPlist() const
{
   hid_t access_plist_id = H5Fget_access_plist( id );

   // if H5Fget_access_plist returns a valid id, create and return
   // the FileAccPropList object for this property list
   if( access_plist_id > 0 )
   {
      FileAccPropList access_plist( access_plist_id );
      return access_plist;
   }
   else // Raise an exception
   {
      throw FileIException("H5File::getAccessPlist", "H5Fget_access_plist failed");
   }
}

//--------------------------------------------------------------------------
// Function:	H5File::getFreeSpace
///\brief	Returns the amount of free space in the file.
///\return	Amount of free space
///\exception	H5::FileIException
// Programmer   Binh-Minh Ribler - May 2004
//--------------------------------------------------------------------------
hssize_t H5File::getFreeSpace() const
{
   hssize_t free_space = H5Fget_freespace(id);
   if( free_space < 0 )
   {
      throw FileIException("H5File::getFreeSpace", "H5Fget_freespace failed");
   }
   return (free_space);
}


//--------------------------------------------------------------------------
// Function:	H5File::getObjCount
///\brief	Returns the number of opened object IDs (files, datasets, 
///		groups and datatypes) in the same file.
///\param	types - Type of object to retrieve the count 
///\return	Number of opened object IDs
///\exception	H5::FileIException
///\par Description
///		The valid values for \a types include:
///		\li \c H5F_OBJ_FILE  Files only  
///		\li \c H5F_OBJ_DATASET  Datasets only  
///		\li \c H5F_OBJ_GROUP  Groups only  
///		\li \c H5F_OBJ_DATATYPE    Named datatypes only  
///		\li \c H5F_OBJ_ATTR    Attributes only  
///		\li \c H5F_OBJ_ALL  All of the above 
///		\li \c (i.e., H5F_OBJ_FILE | H5F_OBJ_DATASET | H5F_OBJ_GROUP | H5F_OBJ_DATATYPE | H5F_OBJ_ATTR )  
/// Multiple object types can be combined with the logical OR operator (|).
// Programmer   Binh-Minh Ribler - May 2004
//--------------------------------------------------------------------------
int H5File::getObjCount(unsigned types) const
{
   int num_objs = H5Fget_obj_count(id, types);
   if( num_objs < 0 )
   {
      throw FileIException("H5File::getObjCount", "H5Fget_obj_count failed");
   }
   return (num_objs);
}

//--------------------------------------------------------------------------
// Function:	H5File::getObjCount
///\brief	This is an overloaded member function, provided for convenience.
///		It takes no parameter and returns the object count of all 
///		object types.
///\return	Number of opened object IDs
///\exception	H5::FileIException
// Programmer   Binh-Minh Ribler - May 2004
//--------------------------------------------------------------------------
int H5File::getObjCount() const
{
   int num_objs = H5Fget_obj_count(id, H5F_OBJ_ALL);
   if( num_objs < 0 )
   {
      throw FileIException("H5File::getObjCount", "H5Fget_obj_count failed");
   }
   return (num_objs);
}

//--------------------------------------------------------------------------
// Function:	H5File::getObjIDs
///\brief	Retrieves a list of opened object IDs (files, datasets, 
///		groups and datatypes) in the same file.
///\param	types    - Type of object to retrieve the count 
///\param	max_objs - Maximum number of object identifiers to place 
///			   into obj_id_list.
///\param	oid_list - List of open object identifiers
///\exception	H5::FileIException
///\par Description
///		The valid values for \a types include:
///		\li \c H5F_OBJ_FILE  Files only  
///		\li \c H5F_OBJ_DATASET  Datasets only  
///		\li \c H5F_OBJ_GROUP  Groups only  
///		\li \c H5F_OBJ_DATATYPE    Named datatypes only  
///		\li \c H5F_OBJ_ATTR    Attributes only  
///		\li \c H5F_OBJ_ALL  All of the above 
///		\li \c (I.e., H5F_OBJ_FILE | H5F_OBJ_DATASET | H5F_OBJ_GROUP | H5F_OBJ_DATATYPE | H5F_OBJ_ATTR )  
/// Multiple object types can be combined with the logical OR operator (|).
//
// Notes: will do the overload for this one after hearing from Quincey???
// Programmer   Binh-Minh Ribler - May 2004
//--------------------------------------------------------------------------
void H5File::getObjIDs(unsigned types, int max_objs, hid_t *oid_list) const
{
   herr_t ret_value = H5Fget_obj_ids(id, types, max_objs, oid_list);
   if( ret_value < 0 )
   {
      throw FileIException("H5File::getObjIDs", "H5Fget_obj_ids failed");
   }
}

//--------------------------------------------------------------------------
// Function:	H5File::getVFDHandle
///\brief	Returns the pointer to the file handle of the low-level file
///		driver.
///\param	fapl        - File access property list
///\param	file_handle - Pointer to the file handle being used by
///			      the low-level virtual file driver
///\exception	H5::FileIException
///\par Description
///		For the FAMILY or MULTI drivers, \a fapl should be 
///		defined through the property list functions: 
///		\c FileAccPropList::setFamilyOffset for the FAMILY driver 
///		and \c FileAccPropList::setMultiType for the MULTI driver.
///
///		The obtained file handle is dynamic and is valid only while 
///		the file remains open; it will be invalid if the file is 
///		closed and reopened or opened during a subsequent session.
// Programmer   Binh-Minh Ribler - May 2004
//--------------------------------------------------------------------------
void H5File::getVFDHandle(FileAccPropList& fapl, void **file_handle) const
{
   hid_t fapl_id = fapl.getId();
   herr_t ret_value = H5Fget_vfd_handle(id, fapl_id, file_handle);
   if( ret_value < 0 )
   {
      throw FileIException("H5File::getVFDHandle", "H5Fget_vfd_handle failed");
   }
}

//--------------------------------------------------------------------------
// Function:	H5File::getVFDHandle
///\brief	This is an overloaded member function, provided for convenience.
///		It differs from the above function only in what arguments it
///		accepts.
///\param	file_handle - Pointer to the file handle being used by
///			      the low-level virtual file driver
///\exception	H5::FileIException
// Programmer   Binh-Minh Ribler - May 2004
//--------------------------------------------------------------------------
void H5File::getVFDHandle(void **file_handle) const
{
   herr_t ret_value = H5Fget_vfd_handle(id, H5P_DEFAULT, file_handle);
   if( ret_value < 0 )
   {
      throw FileIException("H5File::getVFDHandle", "H5Fget_vfd_handle failed");
   }
}

//--------------------------------------------------------------------------
// Function:	H5File::Reference
///\brief	Creates a reference to an Hdf5 object or a dataset region.
///\param	name - IN: Name of the object to be referenced
///\param	dataspace - IN: Dataspace with selection
///\param	ref_type - IN: Type of reference; default to \c H5R_DATASET_REGION
///\return	A reference
///\exception	H5::ReferenceIException
///\par Description
///		Note that, for H5File, name must be an absolute path to the 
///		object in the file.
// Programmer	Binh-Minh Ribler - May, 2004
//--------------------------------------------------------------------------
void* H5File::Reference(const char* name, DataSpace& dataspace, H5R_type_t ref_type) const
{
   return(p_reference(name, dataspace.getId(), ref_type));
}

//--------------------------------------------------------------------------
// Function:	H5File::Reference
///\brief	This is an overloaded function, provided for your convenience.
///		It differs from the above function in that it only creates
///		a reference to an HDF5 object, not to a dataset region.
///\param	name - IN: Name of the object to be referenced
///\return	A reference
///\exception	H5::ReferenceIException
///\par Description
//		This function passes H5R_OBJECT and -1 to the protected 
//		function for it to pass to the C API H5Rcreate
//		to create a reference to the named object.
///\par
///		Note that, for H5File, name must be an absolute path to the 
///		object in the file.
// Programmer	Binh-Minh Ribler - May, 2004
//--------------------------------------------------------------------------
void* H5File::Reference(const char* name) const
{
   return(p_reference(name, -1, H5R_OBJECT));
}

//--------------------------------------------------------------------------
// Function:	H5File::getObjType
///\brief	Retrieves the type of object that an object reference points to.
///\param		ref      - IN: Reference to query
///\param		ref_type - IN: Type of reference to query
///\return	Object type, which can be one of the following:
///			\li \c H5G_LINK Object is a symbolic link.  
///			\li \c H5G_GROUP Object is a group.  
///			\li \c H5G_DATASET   Object is a dataset.  
///			\li \c H5G_TYPE Object is a named datatype 
///\exception	H5::ReferenceIException
// Programmer	Binh-Minh Ribler - May, 2004
//--------------------------------------------------------------------------
H5G_obj_t H5File::getObjType(void *ref, H5R_type_t ref_type) const
{
   return(p_get_obj_type(ref, ref_type));
}

//--------------------------------------------------------------------------
// Function:	H5File::getRegion
///\brief	Retrieves a dataspace with the region pointed to selected.
///\param	ref      - IN: Reference to get region of
///\param	ref_type - IN: Type of reference to get region of - default
///\return	DataSpace instance
///\exception	H5::ReferenceIException
// Programmer	Binh-Minh Ribler - May, 2004
//--------------------------------------------------------------------------
DataSpace H5File::getRegion(void *ref, H5R_type_t ref_type) const
{
   DataSpace dataspace(p_get_region(ref, ref_type));
   return(dataspace);
}
//--------------------------------------------------------------------------
// Function:	H5File::getLocId
// Purpose:	Get the id of this file
// Description
//		This function is a redefinition of CommonFG::getLocId.  It
//		is used by CommonFG member functions to get the file id.
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
hid_t H5File::getLocId() const
{
   return( getId() );
}

//--------------------------------------------------------------------------
// Function:    H5File::p_close (private)
///\brief       Closes this H5 file.
///\exception   H5::FileIException
///\note
///             This function will be obsolete because its functionality
///             is recently handled by the C library layer.
// Programmer   Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
void H5File::p_close() const
{
   herr_t ret_value = H5Fclose( id );
   if( ret_value < 0 )
   {
      throw FileIException(0, "H5Fclose failed");
   }
}

//--------------------------------------------------------------------------
// Function:	H5File::throwException
///\brief	Throws file exception - initially implemented for CommonFG
///\param	func_name - Name of the function where failure occurs
///\param	msg       - Message describing the failure
///\exception	H5::FileIException
// Description
// 		This function is used in CommonFG implementation so that 
//		proper exception can be thrown for file or group.  The 
//		argument func_name is a member of CommonFG and "H5File::" 
//		will be inserted to indicate the function called is an 
//		implementation of H5File.
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
void H5File::throwException(const string func_name, const string msg) const
{
   string full_name = func_name;
   full_name.insert(0, "H5File::"); 
   throw FileIException(full_name, msg);
}

//--------------------------------------------------------------------------
// Function:	H5File destructor
///\brief	Properly terminates access to this file. 
// Programmer	Binh-Minh Ribler - 2000
//--------------------------------------------------------------------------
H5File::~H5File() 
{  
   // The HDF5 file id will be closed properly
    try {
        decRefCount();
    }
    catch (Exception close_error) {
        cerr << "H5File::~H5File - " << close_error.getDetailMsg() << endl;
    }
}  

#ifndef H5_NO_NAMESPACE
} // end namespace
#endif