Examples of com.dtrules.entity.REntity

com.dtrules.entity.REntity
Entities serve as the dictionaries of the Rules Engine. These Dictionaries are typed Hashtables. In other words, you can't just put any old object into an Entity. There has to be an attribute with the appropriate name and type in order to put a particular object with that name into an Entity.

This structure catches many data entry and program structure errors, as well as provides for a number of convienent automatic data conversions (if the compiler writer cares to provide such facilities). @author Paul Snow


    public void endTag(String[] tagstk, int tagstkptr, String tag, String body,
            HashMap attribs) throws Exception, IOException 
    {
      String  attr;
    REntity entity = null;
    
    if(attribs.containsKey("create entity")){                // For create Entity Tags, we pop the Entity from the Entity Stack on the End Tag.
      entity = (REntity) state.entitypop();
      Iterator pairs  = map.attribute2listPairs.iterator();
      body = "";                                                      // Don't care about the Body if we created an Entity.
      while(pairs.hasNext()){
        Object [] pair =  (Object []) pairs.next();
          if(entity.containsAttribute(RName.getRName((String)pair[0]))){
            RName.getRName((String) pair[1],true).execute(state);
            state.entitypush(entity);
            RName.getRName("addto",true).execute(state);
            
          }

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              errorMsgs += "Bad Default Value '"+defaultv+"' encountered on entity: '"+entityname+"' attribute: '"+attribute+"' \n";
              succeeded = false;
          }
      RName  entityRName = RName.getRName(entityname.trim(),false);
      RName  attributeRName = RName.getRName(attribute.trim(),false);
      REntity entity = ef.findcreateRefEntity(false,entityRName);
          int    intType = -1;
          try {
      intType = RSession.typeStr2Int(type,entityname,attribute);
      } catch (RulesException e) { 
      errorMsgs += "Bad Type: '"+type+"' encountered on entity: '"+entityname+"' attribute: '"+attribute+"' \n";
      succeeded = false;
      }
      
      String errstr  = entity.addAttribute(attributeRName,
                                           defaultv, 
                                           defaultO,
                                           writeable,
                                           readable,
                                           intType,

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        IRObject defaultO = EntityFactory.computeDefaultValue(session, ef, default_value, itype) ;
        
        RName  entityRName = RName.getRName(entityname.trim(),false);
        RName  attributeRName = RName.getRName(attrib_name.trim(),false);
        REntity entity = ef.findcreateRefEntity(false,entityRName);
        int    intType = -1;


        try {
          intType = RSession.typeStr2Int(type,entityname,attrib_name);
        } catch (RulesException e) { 
          errorMsgs += "Bad Type: '"+type+"' encountered on entity: '"+entityname+"' attribute: '"+attrib_name+"' \n";
          succeeded = false;
        }
        String errstr  = entity.addAttribute(attributeRName,
                                             default_value, 
                                             defaultO,
                                             writeable,
                                             readable,
                                             intType,

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     */
  public IREntity createEntity(Object id, RName name) throws RulesException{
      if(id==null){
          id = getUniqueID()+"";
      }
    REntity ref = ef.findRefEntity(name);
        if(ref==null){
            throw new RulesException("undefined","session.createEntity","An attempt ws made to create the entity "+name.stringValue()+"\n" +
                    "This entity isn't defined in the EDD");
        }
        if(!ref.isReadOnly()){
            REntity e = (REntity) ref.clone(this);
            entityInstances.put(id,e);
            return e;
        }
    return ref;
  }

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    public void endTag(String[] tagstk, int tagstkptr, String tag, Object body,
            HashMap attribs) throws Exception, IOException 
    {
      String  attr;
    REntity entity = null;
    
    if(attribs.containsKey("create entity")){                // For create Entity Tags, we pop the Entity from the Entity Stack on the End Tag.
          attribs.remove("create entity");
        entity = (REntity) state.entitypop();
      Iterator pairs  = map.attribute2listPairs.iterator();
      body = "";                                                      // Don't care about the Body if creating an Entity, but it can't be null either.
      while(pairs.hasNext()){
        Object [] pair =  (Object []) pairs.next();
          if(entity.containsAttribute(RName.getRName((String)pair[0]))){
            RName.getRName((String) pair[1],true).execute(state);
            state.entitypush(entity);
            RName.getRName("addto",true).execute(state);
            
          }

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    public void endTag(String[] tagstk, int tagstkptr, String tag, String body,
            HashMap attribs) throws Exception, IOException 
    {
      String  attr;
    REntity entity = null;
    
    if(attribs.containsKey("create entity")){                // For create Entity Tags, we pop the Entity from the Entity Stack on the End Tag.
      entity = (REntity) state.entitypop();
      Iterator pairs  = map.attribute2listPairs.iterator();
      body = "";                                                      // Don't care about the Body if we created an Entity.
      while(pairs.hasNext()){
        Object [] pair =  (Object []) pairs.next();
          if(entity.containsAttribute(RName.getRName((String)pair[0]))){
            RName.getRName((String) pair[1],true).execute(state);
            state.entitypush(entity);
            RName.getRName("addto",true).execute(state);
            
          }

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   * 
   * @param name
   */
  public REntity findcreateRefEntity(boolean readonly, RName name)throws RulesException {
    if(!referenceEntities.containsKey(name)){
      IREntity entity = new REntity(getUniqueID(), readonly, name); 
      referenceEntities.put(name,entity);
    }
    return (REntity) referenceEntities.get(name);
  }

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                         "length",   array.size()+"",
                         "by",       rname.stringValue(),
                         "arrayID",  rarray.getID()+"",
                         asc ? "true" : "false");
              }
        REntity temp = null;
        int size = array.size();
                int greaterthan = asc ? 1 : -1;
        for(int i=0; i<size; i++){
                    boolean done = true;
          for(int j=0; j<size-1-i; j++){

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              entityInstances.put(id,e);
            }
            return e;
      }else{
        REntity e = (REntity) ref.clone(this);
        return e;
      }
   
  }

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        types = new HashMap<RName, RType>();
        Iterator<RName> entities = ef.getEntityRNameIterator();
        while(entities.hasNext()){
            RName    name    = entities.next();
            REntity  entity  = ef.findRefEntity(name);
            Iterator<RName> attribs = entity.getAttributeIterator();
            addType(entity,entity.getName(),IRObject.iEntity);
            while(attribs.hasNext()){
                RName        attribname = attribs.next();
                REntityEntry entry      = entity.getEntry(attribname);
                addType(entity,attribname,entry.type);
            }
        }
        
        Iterator<RName> tables = ef.getDecisionTableRNameIterator();

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