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/**
* @file geis_attr.h
* @brief internal GeisAttr facilities
*
* Copyright 2010 Canonical Ltd.
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 3 of the License, or (at your option) any
* later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef GEIS_ATTR_H_
#define GEIS_ATTR_H_
#include <geis/geis.h>
typedef struct _GeisAttrBag *GeisAttrBag;
typedef void (*GeisAttrDestructor)(void *);
/**
* Creates a new Geis Attribute container.
*/
GeisAttrBag geis_attr_bag_new(GeisSize size_hint);
/**
* Destroys a Geis Attribute container.
*/
void geis_attr_bag_delete(GeisAttrBag bag);
/**
* Tells how any entires in a Geis Attribute container.
*/
GeisSize geis_attr_bag_count(GeisAttrBag bag);
/**
* Pulls an indicated attr out of a bag.
*/
GeisAttr geis_attr_bag_attr(GeisAttrBag bag, GeisSize index);
/**
* Inserts an attribute in an attribute container.
*/
GeisStatus geis_attr_bag_insert(GeisAttrBag bag, GeisAttr attr);
/**
* Replaces an attribute in an attribute container.
*/
GeisStatus geis_attr_bag_replace(GeisAttrBag bag, GeisAttr attr);
/**
* Looks for an attribute in an attribute container.
*/
GeisAttr geis_attr_bag_find(GeisAttrBag bag, GeisString attr_name);
/**
* Creates a Geis Attribute object.
*/
GeisAttr geis_attr_new(GeisString attr_name, GeisAttrType attr_type, void* attr_value);
/**
* Destroys a Geis Attribute object.
*/
void geis_attr_delete(GeisAttr attr);
/**
* Gets the (generic) attribute value.
*/
void *geis_attr_value(GeisAttr attr);
/**
* Set a destructor for a pointer attr.
*
* @param[in] attr An attr.
* @param[in] destructor A destrutor function for a pointer attr value.
*/
void geis_attr_set_destructor(GeisAttr attr, GeisAttrDestructor destructor);
/**
* Compares two attributes using a filter operation.
*
* @param[in] lhs The attr on the left-hand side of the comparison.
* @param[in] rhs The attr on the right-hand side of the comparison.
* @param[in] op The filter operation.
*
* Returns GEIS_TRUE if the comparison is true, GEIS_FALSE otherwise.
*/
GeisBoolean geis_attr_compare(GeisAttr lhs, GeisAttr rhs, GeisFilterOperation op);
#endif /* GEIS_ATTR_H_ */
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