nes-proj/core/lib/crtk.c

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/*
* Copyright (c) 2006, Swedish Institute of Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)$Id: crtk.c,v 1.1 2006/06/17 22:41:17 adamdunkels Exp $
*/
/*
* RUNES CRTK Implementation
* Version 0.3
*
* Stefanos Zachariadis, UCL, s.zachariadis@cs.ucl.ac.uk
*/
#include <stdio.h>
#include <string.h>
#include "crtk.h"
static Attribute a = { "Author", "Stefanos Zachariadis", NULL };
static Entity attributes = { 0, COMPONENT, "crtk", &a, NULL };
static int entities;
static void construct(void) {
printf("Instantiating RUNES middleware\n");
}
static void destroy(void) {
printf("RUNES Middleware going away...\n");
}
static void printregistry(void) {
printf("The Registry Currently Contains:\n");
Entity *current;
current=&attributes;
while(current!=NULL) {
Attribute *attrs;
attrs=current->attributes;
printf("Entity (%d,%d) \n",current->id, current->type);
while(attrs!=NULL) {
printf(" (%s,%s)\n",attrs->key,(char *)(attrs->value));
attrs=attrs->next;
}
current=current->next;
}
}
static void delent(Entity *e) {
Entity *previous = &attributes; /* Not allowed to delete first! */
Entity *current = previous->next;
while(current != NULL) {
if(e->id == current->id) {
previous->next = current->next;
current->next = NULL;
return;
}
previous = current;
current = current->next;
}
}
static void putattr(Entity *e, Attribute *a) {
Entity *current, *previous = NULL;
current=&attributes;
while(NULL!=current) {
//printf("looping\n");
if(e->id==current->id) { //the entity already exists in our databas
//we need to see if an attribute with the same key exists
Attribute *tmp;
for(tmp=current->attributes;tmp->next!=NULL;tmp=tmp->next) {
if(strcmp(tmp->key,a->key)==0) { //it does exist
tmp->value=a->value;
return;
}
}
//we need to add this attribute
tmp->next=a;
a->next=NULL;
return;
}
previous=current;
current=current->next;
}
e->next=NULL;
previous->next=e;
e->attributes=a;
a->next=NULL;
}
static void getattr(Entity e, char *key, Attribute **atr) {
//right, so we're going to go through our registry.
Entity *current;
current=&attributes;
while(current!=NULL) {
if(e.id==current->id) { //we found the element
Attribute *tmp;
for(tmp=current->attributes;tmp!=NULL;tmp=tmp->next) {
if(strcmp(tmp->key,key)==0) { //the key does exist
*atr=tmp;
return;
}
}
}
current=current->next;
}
atr=NULL;
}
static void connect(Interface i, Receptacle *r) {
*r=i;
}
static void instantiate(Entity *e, Attribute *init) {
e->id=entities++;
putattr(e,init);
}
static void getentities(Entity **e) {
*e=&attributes;
}
IMPLEMENT_COMPONENT(crtk, { printregistry, delent, putattr, getattr,
connect, instantiate, getentities });