godot/core/dictionary.cpp

/*************************************************************************/
/*  dictionary.cpp                                                       */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2016 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,  */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "dictionary.h"
#include "safe_refcount.h"
#include "variant.h"
#include "io/json.h"

struct _DictionaryVariantHash {

	static _FORCE_INLINE_ uint32_t hash(const Variant &p_variant)  { return p_variant.hash(); }
};


struct DictionaryPrivate {

	SafeRefCount refcount;
	HashMap<Variant,Variant,_DictionaryVariantHash> variant_map;
	bool shared;

};


void Dictionary::get_key_list( List<Variant> *p_keys) const {

	_p->variant_map.get_key_list(p_keys);
}

void Dictionary::_copy_on_write() const {

	//make a copy of what we have
	if (_p->shared)
		return;

	DictionaryPrivate *p = memnew(DictionaryPrivate);
	p->shared=_p->shared;
	p->variant_map=_p->variant_map;
	p->refcount.init();
	_unref();
	_p=p;
}

Variant& Dictionary::operator[](const Variant& p_key) {

	_copy_on_write();

	return _p->variant_map[p_key];
}

const Variant& Dictionary::operator[](const Variant& p_key) const {

	return _p->variant_map[p_key];

}
const Variant* Dictionary::getptr(const Variant& p_key) const {

	return _p->variant_map.getptr(p_key);
}
Variant* Dictionary::getptr(const Variant& p_key) {

	_copy_on_write();
	return _p->variant_map.getptr(p_key);
}

Variant Dictionary::get_valid(const Variant& p_key) const {

	const Variant *v = getptr(p_key);
	if (!v)
		return Variant();
	return *v;
}


int Dictionary::size() const {

	return _p->variant_map.size();

}
bool Dictionary::empty() const {

	return !_p->variant_map.size();
}

bool Dictionary::has(const Variant& p_key) const {

	return _p->variant_map.has(p_key);
}
void Dictionary::erase(const Variant& p_key) {
	_copy_on_write();
	_p->variant_map.erase(p_key);
}

bool Dictionary::operator==(const Dictionary& p_dictionary) const {

	return _p==p_dictionary._p;
}

void Dictionary::_ref(const Dictionary& p_from) const {

	//make a copy first (thread safe)
	if (!p_from._p->refcount.ref())
		return; // couldn't copy

	//if this is the same, unreference the other one
	if (p_from._p==_p) {
		_p->refcount.unref();
		return;
	}
	if (_p)
		_unref();
	_p=p_from._p;

}

void Dictionary::clear() {

	_copy_on_write();
	_p->variant_map.clear();
}

bool Dictionary::is_shared() const {

    return _p->shared;
}


void Dictionary::_unref() const {

	ERR_FAIL_COND(!_p);
	if (_p->refcount.unref()) {
		memdelete(_p);
	}
	_p=NULL;

}
uint32_t Dictionary::hash() const {

	uint32_t h=hash_djb2_one_32(Variant::DICTIONARY);

	List<Variant> keys;
	get_key_list(&keys);

	for (List<Variant>::Element *E=keys.front();E;E=E->next()) {

		h = hash_djb2_one_32( E->get().hash(), h);
		h = hash_djb2_one_32( operator[](E->get()).hash(), h);

	}


	return h;
}

Array Dictionary::keys() const {

	Array karr;
	karr.resize(size());
	const Variant *K=NULL;
	int idx=0;
	while((K=next(K))) {
		karr[idx++]=(*K);
	}
	return karr;

}

const Variant* Dictionary::next(const Variant* p_key) const {

	return _p->variant_map.next(p_key);
}


Error Dictionary::parse_json(const String& p_json) {

	String errstr;
	int errline=0;
	if (p_json != ""){
	Error err = JSON::parse(p_json,*this,errstr,errline);
	if (err!=OK) {
		ERR_EXPLAIN("Error parsing JSON: "+errstr+" at line: "+itos(errline));
		ERR_FAIL_COND_V(err!=OK,err);
		}
	}

	return OK;
}

String Dictionary::to_json() const {

	return JSON::print(*this);
}


void Dictionary::operator=(const Dictionary& p_dictionary) {

	_ref(p_dictionary);
}



Dictionary::Dictionary(const Dictionary& p_from) {
	_p=NULL;
	_ref(p_from);
}


Dictionary::Dictionary(bool p_shared) {

	_p=memnew( DictionaryPrivate );
	_p->refcount.init();
	_p->shared=p_shared;

}
Dictionary::~Dictionary() {

	_unref();
}