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/************************************************************************/
/* */
/* Centre for Speech Technology Research */
/* University of Edinburgh, UK */
/* Copyright (c) 1996,1997 */
/* All Rights Reserved. */
/* */
/* Permission is hereby granted, free of charge, to use and distribute */
/* this software and its documentation without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of this work, and to */
/* permit persons to whom this work is furnished to do so, subject to */
/* the following conditions: */
/* 1. The code must retain the above copyright notice, this list of */
/* conditions and the following disclaimer. */
/* 2. Any modifications must be clearly marked as such. */
/* 3. Original authors' names are not deleted. */
/* 4. The authors' names are not used to endorse or promote products */
/* derived from this software without specific prior written */
/* permission. */
/* */
/* THE UNIVERSITY OF EDINBURGH AND THE CONTRIBUTORS TO THIS WORK */
/* DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING */
/* ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT */
/* SHALL THE UNIVERSITY OF EDINBURGH NOR THE CONTRIBUTORS BE LIABLE */
/* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES */
/* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN */
/* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, */
/* ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF */
/* THIS SOFTWARE. */
/* */
/*************************************************************************/
#ifndef __EST_FEATUREFUNCTIONCONTEXT_H__
#define __EST_FEATUREFUNCTIONCONTEXT_H__
/** A feature function context is the interface through which feature
* functions are looked up. It is basically a list of feature function
* packages.
*
* @author Richard Caley <rjc@cstr.ed.ac.uk>
* @version $Id: EST_FeatureFunctionContext.h,v 1.3 2004/05/04 00:00:17 awb Exp $ */
#include "ling_class/EST_FeatureFunctionPackage.h"
class ling_class_init;
class EST_FeatureFunctionContext {
private:
EST_TList <EST_FeatureFunctionPackage *> packages;
EST_TStringHash <EST_Item_featfunc> cache;
protected:
static EST_FeatureFunctionContext *global;
void add_package(EST_FeatureFunctionPackage *package);
EST_FeatureFunctionPackage *get_package(const EST_String name) const;
EST_String get_featfunc_name(const EST_Item_featfunc func, int &found) const;
public:
static const EST_String separator;
EST_FeatureFunctionContext(void);
~EST_FeatureFunctionContext(void);
void clear_cache(void);
void add_package(const EST_String name);
bool package_included(const EST_String name) const;
const EST_Item_featfunc get_featfunc(const EST_String name,
int must=0);
const EST_Item_featfunc get_featfunc(const EST_String package,
const EST_String name,
int must=0);
protected:
static void class_init(void);
friend class ling_class_init;
friend void EST_register_feature_function_package(const char *name, void (*init_fn)(EST_FeatureFunctionPackage &p));
friend void register_featfunc(const EST_String &name, const EST_Item_featfunc func);
friend const EST_Item_featfunc get_featfunc(const EST_String &name,int must);
friend EST_String get_featname(const EST_Item_featfunc func);
};
#endif
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