152 lines
4.3 KiB
C
152 lines
4.3 KiB
C
/*
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* Copyright (c) 2006, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)$Id: crtk.c,v 1.1 2007/05/23 23:23:23 oliverschmidt Exp $
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*/
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/*
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* RUNES CRTK Implementation
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* Version 0.3
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*
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* Stefanos Zachariadis, UCL, s.zachariadis@cs.ucl.ac.uk
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*/
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#include <stdio.h>
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#include <string.h>
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#include "crtk.h"
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static Attribute a = { "Author", "Stefanos Zachariadis", NULL };
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static Entity attributes = { 0, COMPONENT, "crtk", &a, NULL };
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static int entities;
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static void construct(void) {
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printf("Instantiating RUNES middleware\n");
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}
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static void destroy(void) {
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printf("RUNES Middleware going away...\n");
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}
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static void printregistry(void) {
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printf("The Registry Currently Contains:\n");
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Entity *current;
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current=&attributes;
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while(current!=NULL) {
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Attribute *attrs;
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attrs=current->attributes;
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printf("Entity (%d,%d) \n",current->id, current->type);
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while(attrs!=NULL) {
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printf(" (%s,%s)\n",attrs->key,(char *)(attrs->value));
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attrs=attrs->next;
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}
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current=current->next;
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}
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}
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static void delent(Entity *e) {
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Entity *previous = &attributes; /* Not allowed to delete first! */
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Entity *current = previous->next;
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while(current != NULL) {
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if(e->id == current->id) {
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previous->next = current->next;
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current->next = NULL;
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return;
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}
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previous = current;
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current = current->next;
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}
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}
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static void putattr(Entity *e, Attribute *a) {
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Entity *current, *previous = NULL;
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current=&attributes;
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while(NULL!=current) {
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//printf("looping\n");
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if(e->id==current->id) { //the entity already exists in our databas
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//we need to see if an attribute with the same key exists
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Attribute *tmp;
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for(tmp=current->attributes;tmp->next!=NULL;tmp=tmp->next) {
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if(strcmp(tmp->key,a->key)==0) { //it does exist
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tmp->value=a->value;
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return;
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}
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}
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//we need to add this attribute
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tmp->next=a;
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a->next=NULL;
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return;
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}
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previous=current;
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current=current->next;
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}
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e->next=NULL;
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previous->next=e;
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e->attributes=a;
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a->next=NULL;
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}
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static void getattr(Entity e, char *key, Attribute **atr) {
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//right, so we're going to go through our registry.
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Entity *current;
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current=&attributes;
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while(current!=NULL) {
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if(e.id==current->id) { //we found the element
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Attribute *tmp;
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for(tmp=current->attributes;tmp!=NULL;tmp=tmp->next) {
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if(strcmp(tmp->key,key)==0) { //the key does exist
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*atr=tmp;
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return;
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}
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}
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}
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current=current->next;
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}
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atr=NULL;
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}
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static void connect(Interface i, Receptacle *r) {
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*r=i;
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}
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static void instantiate(Entity *e, Attribute *init) {
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e->id=entities++;
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putattr(e,init);
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}
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static void getentities(Entity **e) {
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*e=&attributes;
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}
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IMPLEMENT_COMPONENT(crtk, { printregistry, delent, putattr, getattr,
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connect, instantiate, getentities });
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