godot/core/string_db.cpp

/*************************************************************************/
/*  string_db.cpp                                                        */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "string_db.h"
#include "print_string.h"

StaticCString StaticCString::create(const char *p_ptr) {
	StaticCString scs; scs.ptr=p_ptr; return scs;
}

StringName::_Data *StringName::_table[STRING_TABLE_LEN];

StringName _scs_create(const char *p_chr) {

	return (p_chr[0]?StringName(StaticCString::create(p_chr)):StringName());
}

bool StringName::configured=false;

void StringName::setup() {
	
	ERR_FAIL_COND(configured);
	for(int i=0;i<STRING_TABLE_LEN;i++) {
		
		_table[i]=NULL;
	}
	configured=true;
}

void StringName::cleanup() {
	
	_global_lock();	
	for(int i=0;i<STRING_TABLE_LEN;i++) {
		
		while(_table[i]) {
			
			_Data*d=_table[i];
			_table[i]=_table[i]->next;
			memdelete(d);
		}
	}
	_global_unlock();	
}

void StringName::unref() {
	
	ERR_FAIL_COND(!configured);

	if (_data && _data->refcount.unref()) {
		
		_global_lock();	

		if (_data->prev) {
			_data->prev->next=_data->next;
		} else {
			if (_table[_data->idx]!=_data) {
				ERR_PRINT("BUG!");
			}
			_table[_data->idx]=_data->next;
		}
		
		if (_data->next) {
			_data->next->prev=_data->prev;

		}
		memdelete(_data);
		_global_unlock();		
	}
	
	_data=NULL;
	
}

bool StringName::operator==(const String& p_name) const {
	
	if (!_data) {
		
		return (p_name.length()==0);
	}
	
	return (_data->get_name()==p_name);
}

bool StringName::operator==(const char* p_name) const {

	if (!_data) {

		return (p_name[0]==0);
	}

	return (_data->get_name()==p_name);
}

bool StringName::operator!=(const String& p_name) const {
	
	return !(operator==(p_name));
}



bool StringName::operator!=(const StringName& p_name) const {
	
	// the real magic of all this mess happens here. 
	// this is why path comparisons are very fast
	return _data!=p_name._data;
	
}


void StringName::operator=(const StringName& p_name) {
	
	if (this==&p_name)
		return;
	
	unref();
	
	if (p_name._data && p_name._data->refcount.ref()) {
		
		_data = p_name._data;		
	}
}

StringName::operator String() const {
	
	if (_data)
		return _data->get_name();
	
	return "";
}

StringName::StringName(const StringName& p_name) {
	
	ERR_FAIL_COND(!configured);
	_data=NULL;
	if (p_name._data && p_name._data->refcount.ref()) {
		
		_data = p_name._data;		
	}	
}

StringName::StringName(const char *p_name) {

	_data=NULL;

	ERR_FAIL_COND(!configured);

	ERR_FAIL_COND( !p_name || !p_name[0]);
	
	_global_lock();	
	
	uint32_t hash = String::hash(p_name);
	
	uint32_t idx=hash&STRING_TABLE_MASK;
	
	_data=_table[idx];
	
	while(_data) {
		
		// compare hash first
		if (_data->hash==hash && _data->get_name()==p_name)
			break;
		_data=_data->next;
	}


	if (_data) {
		if (_data->refcount.ref()) {
			// exists
			_global_unlock();
			return;
		} else {

		}
	}

	_data = memnew( _Data );
	_data->name=p_name;
	_data->refcount.init();
	_data->hash=hash;
	_data->idx=idx;
	_data->cname=NULL;
	_data->next=_table[idx];
	_data->prev=NULL;
	if (_table[idx])
		_table[idx]->prev=_data;
	_table[idx]=_data;


	_global_unlock();
	
}

StringName::StringName(const StaticCString& p_static_string) {

	_data=NULL;

	ERR_FAIL_COND(!configured);

	ERR_FAIL_COND( !p_static_string.ptr || !p_static_string.ptr[0]);

	_global_lock();

	uint32_t hash = String::hash(p_static_string.ptr);

	uint32_t idx=hash&STRING_TABLE_MASK;

	_data=_table[idx];

	while(_data) {

		// compare hash first
		if (_data->hash==hash && _data->get_name()==p_static_string.ptr)
			break;
		_data=_data->next;
	}


	if (_data) {
		if (_data->refcount.ref()) {
			// exists
			_global_unlock();
			return;
		} else {

		}
	}

	_data = memnew( _Data );

	_data->refcount.init();
	_data->hash=hash;
	_data->idx=idx;	
	_data->cname=p_static_string.ptr;
	_data->next=_table[idx];
	_data->prev=NULL;
	if (_table[idx])
		_table[idx]->prev=_data;
	_table[idx]=_data;


	_global_unlock();

}


StringName::StringName(const String& p_name) {
	
	_data=NULL;

	ERR_FAIL_COND(!configured);

	_global_lock();	
	
	uint32_t hash = p_name.hash();
	
	uint32_t idx=hash&STRING_TABLE_MASK;

	_data=_table[idx];
	
	while(_data) {
		
		if (_data->hash==hash && _data->get_name()==p_name)
			break;
		_data=_data->next;
	}
		

	if (_data) {
		if (_data->refcount.ref()) {
			// exists
			_global_unlock();
			return;
		} else {


		}
	}


	_data = memnew( _Data );
	_data->name=p_name;
	_data->refcount.init();
	_data->hash=hash;
	_data->idx=idx;
	_data->cname=NULL;
	_data->next=_table[idx];
	_data->prev=NULL;
	if (_table[idx])
		_table[idx]->prev=_data;
	_table[idx]=_data;

	_global_unlock();
	
}

StringName StringName::search(const char *p_name) {

	ERR_FAIL_COND_V(!configured,StringName());

	ERR_FAIL_COND_V( !p_name, StringName() );
	if (!p_name[0])
		return StringName();

	_global_lock();

	uint32_t hash = String::hash(p_name);

	uint32_t idx=hash&STRING_TABLE_MASK;

	_Data *_data=_table[idx];

	while(_data) {

		// compare hash first
		if (_data->hash==hash && _data->get_name()==p_name)
			break;
		_data=_data->next;
	}

	if (_data && _data->refcount.ref()) {
		_global_unlock();
		return StringName(_data);

	}

	_global_unlock();
	return StringName(); //does not exist


}

StringName StringName::search(const CharType *p_name) {

	ERR_FAIL_COND_V(!configured,StringName());

	ERR_FAIL_COND_V( !p_name, StringName() );
	if (!p_name[0])
		return StringName();

	_global_lock();

	uint32_t hash = String::hash(p_name);

	uint32_t idx=hash&STRING_TABLE_MASK;

	_Data *_data=_table[idx];

	while(_data) {

		// compare hash first
		if (_data->hash==hash && _data->get_name()==p_name)
			break;
		_data=_data->next;
	}

	if (_data && _data->refcount.ref()) {
		_global_unlock();
		return StringName(_data);

	}

	_global_unlock();
	return StringName(); //does not exist

}
StringName StringName::search(const String &p_name) {

	ERR_FAIL_COND_V( p_name=="", StringName() );

	_global_lock();

	uint32_t hash = p_name.hash();

	uint32_t idx=hash&STRING_TABLE_MASK;

	_Data *_data=_table[idx];

	while(_data) {

		// compare hash first
		if (_data->hash==hash && p_name==_data->get_name())
			break;
		_data=_data->next;
	}

	if (_data && _data->refcount.ref()) {
		_global_unlock();
		return StringName(_data);

	}

	_global_unlock();
	return StringName(); //does not exist

}


StringName::StringName() {
	
	_data=NULL;
}

StringName::~StringName() {
	
	unref();
}