freeswitch/src/switch_core_hash.c

/* 
 * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
 * Copyright (C) 2005-2011, Anthony Minessale II <anthm@freeswitch.org>
 *
 * Version: MPL 1.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
 *
 * The Initial Developer of the Original Code is
 * Anthony Minessale II <anthm@freeswitch.org>
 * Portions created by the Initial Developer are Copyright (C)
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * 
 * Anthony Minessale II <anthm@freeswitch.org>
 * Michael Jerris <mike@jerris.com>
 * Paul D. Tinsley <pdt at jackhammer.org>
 *
 *
 * switch_core_hash.c -- Main Core Library (hash functions)
 *
 */

#include <switch.h>
#include "private/switch_core_pvt.h"
#include <sqlite3.h>
#include "../../../libs/sqlite/src/hash.h"

struct switch_hash {
	Hash table;
	switch_memory_pool_t *pool;
};

SWITCH_DECLARE(switch_status_t) switch_core_hash_init_case(switch_hash_t **hash, switch_memory_pool_t *pool, switch_bool_t case_sensitive)
{
	switch_hash_t *newhash;

	if (pool) {
		newhash = switch_core_alloc(pool, sizeof(*newhash));
		newhash->pool = pool;
	} else {
		switch_zmalloc(newhash, sizeof(*newhash));
	}

	switch_assert(newhash);

	sqlite3HashInit(&newhash->table, case_sensitive ? SQLITE_HASH_BINARY : SQLITE_HASH_STRING, 1);
	*hash = newhash;

	return SWITCH_STATUS_SUCCESS;
}

SWITCH_DECLARE(switch_status_t) switch_core_hash_destroy(switch_hash_t **hash)
{
	switch_assert(hash != NULL && *hash != NULL);
	sqlite3HashClear(&(*hash)->table);

	if (!(*hash)->pool) {
		free(*hash);
	}

	*hash = NULL;

	return SWITCH_STATUS_SUCCESS;
}

SWITCH_DECLARE(switch_status_t) switch_core_hash_insert(switch_hash_t *hash, const char *key, const void *data)
{
	sqlite3HashInsert(&hash->table, key, (int) strlen(key) + 1, (void *) data);
	return SWITCH_STATUS_SUCCESS;
}

SWITCH_DECLARE(switch_status_t) switch_core_hash_insert_locked(switch_hash_t *hash, const char *key, const void *data, switch_mutex_t *mutex)
{
	if (mutex) {
		switch_mutex_lock(mutex);
	}

	sqlite3HashInsert(&hash->table, key, (int) strlen(key) + 1, (void *) data);

	if (mutex) {
		switch_mutex_unlock(mutex);
	}

	return SWITCH_STATUS_SUCCESS;
}

SWITCH_DECLARE(switch_status_t) switch_core_hash_delete(switch_hash_t *hash, const char *key)
{
	sqlite3HashInsert(&hash->table, key, (int) strlen(key) + 1, NULL);
	return SWITCH_STATUS_SUCCESS;
}

SWITCH_DECLARE(switch_status_t) switch_core_hash_delete_locked(switch_hash_t *hash, const char *key, switch_mutex_t *mutex)
{
	if (mutex) {
		switch_mutex_lock(mutex);
	}

	sqlite3HashInsert(&hash->table, key, (int) strlen(key) + 1, NULL);

	if (mutex) {
		switch_mutex_unlock(mutex);
	}

	return SWITCH_STATUS_SUCCESS;
}

SWITCH_DECLARE(switch_status_t) switch_core_hash_delete_multi(switch_hash_t *hash, switch_hash_delete_callback_t callback, void *pData) {

	switch_hash_index_t *hi = NULL;
	switch_event_t *event = NULL;
	switch_event_header_t *header = NULL;
	switch_status_t status = SWITCH_STATUS_GENERR;
	
	switch_event_create_subclass(&event, SWITCH_EVENT_CLONE, NULL);
	switch_assert(event);
	
	/* iterate through the hash, call callback, if callback returns true, put the key on the list (event)
	   When done, iterate through the list deleting hash entries
	 */
	
	for (hi = switch_hash_first(NULL, hash); hi; hi = switch_hash_next(hi)) {
		const void *key;
		void *val;
		switch_hash_this(hi, &key, NULL, &val);
		if (callback(key, val, pData)) {
			switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "delete", (const char *) key);
		}
	}
	
	/* now delete them */
	for (header = event->headers; header; header = header->next) {
		if (switch_core_hash_delete(hash, header->value) == SWITCH_STATUS_SUCCESS) {
			status = SWITCH_STATUS_SUCCESS;
		}
	}

	switch_event_destroy(&event);
	
	return status;
}


SWITCH_DECLARE(void *) switch_core_hash_find(switch_hash_t *hash, const char *key)
{
	return sqlite3HashFind(&hash->table, key, (int) strlen(key) + 1);
}

SWITCH_DECLARE(void *) switch_core_hash_find_locked(switch_hash_t *hash, const char *key, switch_mutex_t *mutex)
{
	void *val;

	if (mutex) {
		switch_mutex_lock(mutex);
	}

	val = sqlite3HashFind(&hash->table, key, (int) strlen(key) + 1);

	if (mutex) {
		switch_mutex_unlock(mutex);
	}

	return val;
}

SWITCH_DECLARE(switch_hash_index_t *) switch_hash_first(char *depricate_me, switch_hash_t *hash)
{
	return (switch_hash_index_t *) sqliteHashFirst(&hash->table);
}

SWITCH_DECLARE(switch_hash_index_t *) switch_hash_next(switch_hash_index_t *hi)
{
	return (switch_hash_index_t *) sqliteHashNext((HashElem *) hi);
}

SWITCH_DECLARE(void) switch_hash_this(switch_hash_index_t *hi, const void **key, switch_ssize_t *klen, void **val)
{
	if (key) {
		*key = sqliteHashKey((HashElem *) hi);
		if (klen) {
			*klen = strlen((char *) *key) + 1;
		}
	}
	if (val) {
		*val = sqliteHashData((HashElem *) hi);
	}
}

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