[svn-r2897] Purpose:

	C++ API for 1.3.x branch

Description:
	The *.C and *.h files named different than those in 1.2.x.
	They are in the form: 'H5' + classname, or just classname if
	the classname is already prefixed with 'H5' to avoid ambiguity
	in documentation context.  This version has several hidden bugs
	fixed and an improvement on the reference counting approach.
	The classes and their inheritance structure are listed below:
	---------------------------------------
	H5Library
	Exception
	RefCounter
	IdComponent
		H5File
		DataSpace
		H5Object
			Group
			AbstractDs
				DataSet
				Attribute
			DataType
				PredType
				EnumType
				CompType
				AtomType
					StrType
					IntType
					FloatType
		PropList
			FileCreatPropList
			FileAccPropList
			DSetCreatPropList
			DSetMemXferPropList
	---------------------------------------
	IdComponent uses RefCounter to keep track of opened objects
	so proper termination of HDF5 objects can be maintained.
	Each class has a .h file containing the class declaration and
	a .C file containing its definition.  In addition to the classes
	files, the following files do not have class information:

	- H5Cpp.h: header file to be included in user's application
	- H5Idtemplates.h: contains a template function used by several classes
	- H5Classes.h: contains forward class declarations
	- H5CommonFG.*: contains common code used by classes H5File and Group
	- H5Include.h: contains the hdf5.h header file and the #undef RCSID
		to work around the problem: multiple defined RcsId
	- H5Alltypes.h: simply serves as a container to hold the header
		files of all datatypes to simplify the header file inclusion

Platforms:
	Solaris (arabica) and Linux

1 files changed, 122 insertions, 0 deletions

diff --git a/c++/src/H5Attribute.C b/c++/src/H5Attribute.C
new file mode 100644
index 0000000..b38267c
--- /dev/null
+++ b/c++/src/H5Attribute.C
@@ -0,0 +1,122 @@
+#include <string>
+
+#include "H5Include.h"
+#include "H5Exception.h"
+#include "H5RefCounter.h"
+#include "H5IdComponent.h"
+#include "H5Idtemplates.h"
+#include "H5PropList.h"
+#include "H5Object.h"
+#include "H5AbstractDs.h"
+#include "H5Attribute.h"
+#include "H5DataType.h"
+#include "H5DataSpace.h"
+
+#ifndef H5_NO_NAMESPACE
+namespace H5 {
+#endif
+
+// Copy constructor: makes a copy of the original object; simply invokes
+// the base class copy constructor.
+Attribute::Attribute( const Attribute& original ) : AbstractDs( original ) {};
+
+// Creates a copy of an existing attribute using an id
+Attribute::Attribute( const hid_t attr_id ) : AbstractDs( attr_id ) {}
+
+// Writes data to this attribute.
+void Attribute::write( const DataType& mem_type, void *buf ) const
+{
+   herr_t ret_value = H5Awrite( id, mem_type.getId(), buf );
+   if( ret_value < 0 )
+   {
+      throw AttributeIException();
+   }
+}
+
+// Reads data from this attribute.
+void Attribute::read( const DataType& mem_type, void *buf ) const
+{
+   herr_t ret_value = H5Aread( id, mem_type.getId(), buf );
+   if( ret_value < 0 )
+   {
+      throw AttributeIException();
+   }
+}
+
+// Gets a copy of the dataspace for this attribute.
+DataSpace Attribute::getSpace() const
+{
+   // Calls C function H5Aget_space to get the id of the dataspace
+   hid_t dataspace_id = H5Aget_space( id );
+
+   // If the dataspace id is valid, create and return the DataSpace object
+   if( dataspace_id > 0 )
+   {
+      DataSpace dataspace( dataspace_id );
+      return( dataspace );
+   }
+   else
+   {
+      throw AttributeIException();
+   }
+}
+
+// This private member function calls the C API to get the generic datatype
+// of the datatype that is used by this attribute.  This function is used
+// by the overloaded functions getDataType defined in AbstractDs for the 
+// generic datatype and specific sub-types.
+hid_t Attribute::p_getType() const
+{
+   hid_t type_id = H5Aget_type( id );
+   if( type_id > 0 )
+      return( type_id );
+   else
+   {
+      throw AttributeIException();
+   }
+}
+
+// Gets the name of this attribute.
+string Attribute::getName( size_t buf_size ) const
+{
+   char* name_C = new char[buf_size+1];  // temporary C-string for C API
+
+   // Calls C routine H5Aget_name to get the name of the attribute
+   herr_t name_size = H5Aget_name( id, buf_size, name_C );
+
+   // If H5Aget_name returns a negative value, raise an exception,
+   if( name_size < 0 )
+   {
+      throw AttributeIException();
+   }
+   // otherwise, create the string to hold the attribute name and return it
+   string name = string( name_C );
+   delete name_C;
+   return( name );
+}
+
+// This private function calls the C API H5Aclose to close this attribute.
+// Used by the IdComponent::reset.
+void Attribute::p_close() const
+{
+   herr_t ret_value = H5Aclose( id );
+   if( ret_value < 0 )
+   {
+      throw AttributeIException();
+   }
+}
+
+// The destructor of this instance calls IdComponent::reset to
+// reset its identifier - no longer true
+// Older compilers (baldric) don't support template member functions
+// and IdComponent::reset is one; so at this time, the resetId is not
+// a member function so it can be template to work around that problem.
+Attribute::~Attribute()
+{
+   // The attribute id will be closed properly
+   resetIdComponent( this );
+}
+
+#ifndef H5_NO_NAMESPACE
+} // end namespace
+#endif