Examples of org.dmd.dmc.DmcObject

org.dmd.dmc.DmcObject
The Dark Matter Core (DMC) Object is the basic entity on which all aspects of the Dark Matter Data framework are based.
The DMC object is basically a typed holder for a collection of attributes. At this level, the DMC is abstract; it is the derived, auto-generated, Dark Matter Objects (DMOs) that give a DMC identity. Storing the attributes as a collection introduces a small amount of overhead to DMOs, but allows for operational concepts such as serialization, modification, formatting, cloning, staging etc. that are all provided automatically. It also allows for the use of DMOs in environments where accessing values by name (for example in GWT-based applications) is a necessity.
In addition to the attribute collection, the only constant overhead for a DMC object is the info Vector. The info Vector will contain various information at various times during the life cycle of an object, but will only take up additional space as required. Again, there is some overhead, but the benefits of that overhead are very useful.
There are currently 6 additional pieces of information stored for a DMC object:
- CONTAINER[0] - if the DMO is wrapped by a DMW generated class, this holds the reference to the DMW. This supports the automatic casting of a DMO to its DMW wrapper type via the use of auto generated Iterable classes.
- BACKREFS[1] - in order to behave nicely with Java garbage collection, the named object reference mechanisms of Dark Matter will maintain knowledge of which resolved reference attributes are pointing at a particular DMO instance. If the DMO is deleted, it can automatically remove the reference to itself in the reference attributes. This is a work around for the fact that the GWT JRE Emulation mechanisms don't support the java.lang.ref.WeakReference mechanisms. Back reference tracking must be enabled via the DmcOmni.instance.backRefTracking() method.
- MODIFIER[2] - the Modifier is used to record changes that are made to an object so that the modifications can be distributed via the Dark Matter Protocol Event (DMPEvent) and then applied to remote objects. This mechanism supports very succinct notification of changes to objects and only includes the object deltas, not the entire object. The MODIFIER and the LASTVAL (described next) will only exist on the object if it has been modified.
- LASTVAL[3] - the LASTVAL is just a handle to the last value that was added to or deleted from a multi-valued attribute. It is required to support the Modifier concept.
- MODREC[4] - the MODREC flag is just a Boolean to indicate that the object is a temporary construct that will be used as a MODification RECorder to populate a DmcTypeModifier with a set of changes to be applied to an object in a cache or a remote object. This value is set when a DMO/DMW is constructed with a DmcTypeModifierMV. This distinction is required to prevent applying backrefs to an object when an object referring to it is in MODREC mode. If we didn't keep track of this, we would wind up tracking references twice.
- STAGING[5] - the STAGING flag is used to indicate that the current object is a staging area for the evaluation of a set of modifications that are about to be applied to an existing object. This mechanism exists to facilitate the application of validation rules to the results of a set of modifications. Instead of cloning an entire object, which could be costly, a staging object will only clone the attributes of a target object that are referred to in the modifications; the other attributes of the staging object are merely references to those in the target object. The staging object can then be passed to the rule manager for validation and, if the resulting object is valid, the modifier can be applied to the target object. While in STAGING mode, the object reference tracking mechanisms are disabled so that we don't track changes that could, in the end not be valid (and also, we don't want to apply them twice).

   * @throws DmcValueException 
   * @throws ClassNotFoundException 
   * @throws ClassNotFoundException  
   */
  public DmcObject createObject(DmcUncheckedObject uco) throws ResultException, DmcValueException, ClassNotFoundException {
    DmcObject      dmo  = null;
    ClassDefinition    cd  = null;
    AttributeDefinition  ad  = null;
    
    if ((cd = schema.isClass((String)uco.classes.get(0))) == null){
          ResultException ex = new ResultException();
            ex.result.addResult(Result.ERROR,"Unknown class: " + uco.classes.get(0));
            throw(ex);
    }
    
//    DebugInfo.debug(uco.toOIF(15));
    
    dmo = cd.newDMOInstance();
    
    // Add the object class
    DmcTypeClassDefinitionREFMV cref = new DmcTypeClassDefinitionREFMV();
    cref.add(cd.getObjectName());
    
    dmo.add(DmcObject.__objectClass, cref);
    
    // And add any auxiliary classes if we have them
    for(int i=1; i<uco.classes.size(); i++){
      if ((cd = schema.isClass((String)uco.classes.get(i))) == null){
            ResultException ex = new ResultException();
              ex.result.addResult(Result.ERROR,"Unknown class: " + uco.classes.get(i));
              throw(ex);
      }
      cref.add(cd.getObjectName());
      dmo.add("objectClass", cref);
    }
    
    Iterator<String> names = uco.getAttributeNames();
    while(names.hasNext()){
      String n = names.next();
      ad = schema.adef(n);
      
      if (ad == null){
            ResultException ex = new ResultException();
              ex.result.addResult(Result.ERROR,"Unknown attribute: " + n);
              throw(ex);
      }
      
      DmcAttributeInfo ai = dmo.getAttributeInfo(n);
      if (ai == null){
        ai = ad.getAttributeInfo();
      }
      
//      DmcAttributeInfo ai = DmcOmni.instance().getInfo(ad.getDmdID());
      
      if (ai == null)
        throw(new IllegalStateException("Unknown attribute id: " + ad.getDmdID() + " for attribute: " + ad.getName()));
      
      NamedStringArray values = null;
      
      switch(ad.getValueType()){
      case SINGLE:
        values = uco.get(n);
        
        try {
          // Try to get the attribute
//          DmcAttribute<?> attr = dmo.get(ad.getName().getNameString());
          DmcAttribute<?> attr = dmo.get(ai);
          
          // If we can't find the attribute container, create it
          if (attr == null)
            attr = ad.getType().getAttributeHolder(ai);
          
          // Set the value
          attr.set(values.get(0));
          
          // Store the attribute
          dmo.set(ai, attr);
        } catch (InstantiationException e) {
          e.printStackTrace();
        } catch (IllegalAccessException e) {
          e.printStackTrace();
        } catch (DmcValueException e) {
          throw(e);
        }
        break;
      case MULTI:
      case HASHMAPPED:
      case TREEMAPPED:
      case HASHSET:
      case TREESET:
        values = uco.get(n);
        
        for (String attrVal: values){
          try {
            // Try to get the attribute
//            DmcAttribute<?> attr = dmo.get(ad.getName().getNameString());
            DmcAttribute<?> attr = dmo.get(ai);
            
            // If we can't find the attribute container, create it
            if (attr == null)
              attr = ad.getType().getAttributeHolder(ai);
                        
            // Add the value to the container
            attr.add(attrVal);
          
            // Store the attribute
            dmo.add(ai, attr);
          } catch (InstantiationException e) {
            e.printStackTrace();
          } catch (IllegalAccessException e) {
            e.printStackTrace();
          } catch (DmcValueException e) {

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   * @return true if the reference can be resolved.
   */
  private boolean resolveIt(DmcObject referrer, DmcNamedObjectREF ref){
    boolean resolved = true;
    
    DmcObject obj = DmcOmni.instance().findNamedDMO(ref.getObjectName());
    
    // Couldn't find it - nuttin' we can do 'bout dat!
    if (obj == null){
      DmcOmni.instance().logDeadReference(referrer, this, ref.getObjectName());
      
      if (DmcOmni.instance().cleanUpDeadRefs())
        resolved = false;
    }
    else{
      // Set the object in the reference
      ref.setObject((DmcNamedObjectIF) obj);
      
      // And if backref tracking is on, inform the object that it's being tracked
      if (DmcOmni.instance().backRefTracking()){
        if (referrer.supportsBackrefTracking()){
          Modifier backrefMod = null;
          
          DmcAttribute<?> mod = this.getNew();
          mod.setAttributeInfo(getAttributeInfo());
          try {
            if (getAttributeInfo().valueType == ValueTypeEnum.SINGLE)
              mod.set(ref);
            else
              mod.add(ref);
          } catch (DmcValueException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
          }
          
          if (getAttributeInfo().valueType == ValueTypeEnum.SINGLE)
            backrefMod = new Modifier(ModifyTypeEnum.SET,mod,referrer);
          else
            backrefMod = new Modifier(ModifyTypeEnum.ADD,mod,referrer);
          
          obj.addBackref(backrefMod);
          
//System.out.println("Resolved ref " + ref.getObjectName().getNameString() + " hash = " + System.identityHashCode(ref));
          // And tell the reference it's back reference modifier
          ref.setBackrefModifier(backrefMod);
        }

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    @Override
    // org.dmd.dms.util.GenUtility.dumpMVType(GenUtility.java:2363)
    public DmcObject add(Object v) throws DmcValueException {
        synchronized(this){
            DmcObject rc = typeCheck(v);
            if (value == null)
                value = new ArrayList<DmcObject>();
            value.add(rc);
            return(rc);
        }

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    public DmcObject del(Object v){
        synchronized(this){
            if (value == null)
                return(null);
    
            DmcObject key = null;
            DmcObject rc = null;
            try {
                key = typeCheck(v);
            } catch (DmcValueException e) {
                throw(new IllegalStateException("Incompatible type passed to del():" + getName(),e));
            }

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                throw(new IllegalStateException("Attribute: " + getAttributeInfo().name + " is not indexed. You can't use setMVnth()."));
            
            if ( (index < 0) || (index >= getAttributeInfo().indexSize))
                throw(new IllegalStateException("Index " + index + " for attribute: " + getAttributeInfo().name + " is out of range: 0 <= index < " + getAttributeInfo().indexSize));
            
            DmcObject rc = null;
            
            if (v != null)
                rc = typeCheck(v);
            
            if (value == null){

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        synchronized(this){
            if (value == null)
                return(false);


            try {
                DmcObject val = typeCheck(v);
                return(value.contains(val));
            } catch (DmcValueException e) {
                return(false);
            }
        }

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    }
    
    @Override
    // org.dmd.dms.util.GenUtility.dumpSVType(GenUtility.java:2010)
    public DmcObject set(Object v) throws DmcValueException {
        DmcObject rc = typeCheck(v);
        // We only return a value if the value actually changed. This supports
        // the applyModifier() mechanism on DmcObject where we only return true
        // if something changed as a result of the modifier
        if (value == null)
            value = rc;

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   * @throws ResultException 
   * @throws Exception 
   */
  public DmwWrapper deserialize(DmcInputStreamIF dis) throws Exception {
    DmwWrapper rc = null;
    DmcObject dmo = null;
        
    // READ: the number of classes in the objectClass
    int classCount = dis.readInt();
    
    // READ: the construction class ID
    int classID = dis.readInt();
    
    // Try to find the class in the schema
    ClassDefinition cd = schema.isClass(classID);
    
    if (cd == null)
      throw new IllegalStateException("Unknown class ID: " + classID + " ensure that you have loaded the required schemas.");
    
    // Instantiate the object
    rc = cd.newInstance();
    dmo = rc.getDmcObject();
        
    // Add the auxiliary classes if they exist
    if (classCount > 1){
      for(int i=1; i<classCount; i++){
        classID = dis.readInt();
        cd = schema.isClass(classID);
        dmo.addAux(new ClassDefinitionREF(cd.getDMO()));
      }
    }
    
    // READ: the number of attributes
    int     attrCount = dis.readAttributeCount();
    
    for(int i=0; i<attrCount; i++){
      DmcAttribute<?> attr = dis.getAttributeInstance();
      
      // READ: the current attribute
      attr.deserializeIt(dis);
      
      if (attr.getAttributeInfo().valueType == ValueTypeEnum.SINGLE)
        dmo.set(attr.getAttributeInfo(), attr);
      else
        dmo.add(attr.getAttributeInfo(), attr);
    }
    
    return(rc);
  }

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   * @throws ResultException 
   * @throws Exception 
   */
  public DmwWrapper deserializeWithConversion(DmcInputStreamIF dis) throws Exception {
    DmwWrapper rc = null;
    DmcObject dmo = null;
        
    // READ: the number of classes in the objectClass
    int classCount = dis.readInt();
    
    // READ: the construction class ID
    int classID = dis.readInt();
    
    // Try to find the class in the schema
    ClassDefinition cd = schema.isClass(classID);
    
    if (cd == null)
      throw new IllegalStateException("Unknown class ID: " + classID + " ensure that you have loaded the required schemas.");
    
    // Instantiate the object
    rc = cd.newInstance();
    dmo = rc.getDmcObject();
    
//DebugInfo.debug("*** INSTANTIATED: " + cd.getConstructionClassName());
        
    // Add the auxiliary classes if they exist
    if (classCount > 1){
      for(int i=1; i<classCount; i++){
        classID = dis.readInt();
        cd = schema.isClass(classID);
        dmo.addAux(new ClassDefinitionREF(cd.getDMO()));
      }
    }
    
    // READ: the number of attributes
    int     attrCount = dis.readAttributeCount();
//DebugInfo.debug("*** attribute count: " + attrCount);
    
    ClassSpecificInfo csi = classRI.get(dmo.getConstructionClassInfo().id);
    
    for(int i=0; i<attrCount; i++){
      DmcAttribute<?> attr = dis.getAttributeInstance();
      
//DebugInfo.debug("*** ATTRIBUTE: " + attr.getName());


      AttributeReadInterceptor ari = attrRI.get(attr.getAttributeInfo());
      
      // If we don't have a global attribute interceptor, see if there's a class specific one
      if ( (ari == null) && (csi != null) )
        ari = csi.getInterceptor(attr);
      
      if (ari == null)
        attr.deserializeIt(dis);
      else
        ari.handleAttribute(dis, attr);
      
      if (attr.getAttributeInfo().valueType == ValueTypeEnum.SINGLE)
        dmo.set(attr.getAttributeInfo(), attr);
      else
        dmo.add(attr.getAttributeInfo(), attr);
    }
    
    ObjectReadInterceptor ori = objRI.get(dmo.getConstructionClassInfo());
    if (ori != null)
      ori.handleObject(dmo);
    
    return(rc);
  }

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  public void add(DmcNamedObjectIF obj){
    data.put(obj.getObjectName(), obj);
  }
  
  public boolean delete(DmcObjectNameIF objname){
    DmcObject obj = (DmcObject) data.get(objname);
    
    if (obj == null)
      return(false);
    
    obj.youAreDeleted();
    
    data.remove(objname);
    
    return(true);
  }

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