Example — Implementing an Instance Provider

The following example shows the Java source code for an instance provider, SimpleInstanceProvider, that implements the enumInstances and getInstance interfaces for the Ex_SimpleInstanceProvider class. For brevity, this example implements the deleteInstance, createInstance, setInstance, and execQuery interfaces by throwing a CIMException. In practice, an instance provider must implement all InstanceProvider interfaces.

Example 5–1 SimpleInstanceProvider Instance Provider

/*
 * "@(#)SimpleInstanceProvider.java"
 */
import com.sun.wbem.cim.*;
import com.sun.wbem.client.*;
import com.sun.wbem.provider.CIMProvider;
import com.sun.wbem.provider20.InstanceProvider;
import com.sun.wbem.provider.MethodProvider;
import java.util.*;
import java.io.*;

public class SimpleInstanceProvider implements InstanceProvider{
     static int loop = 0;
     public void initialize(CIMOMHandle cimom) throws CIMException {
     }
     public void cleanup() throws CIMException {
     }
     public Vector enumInstances(CIMObjectPath op, boolean deep, CIMClass cc,
            boolean localOnly) throws CIMException {
                return null;
     }
     /*
      * enumInstances:
      * The entire instances and not just the names are returned.
      * Deep or shallow enumeration is possible, however
      * currently the CIMOM only asks for shallow enumeration.
      */
     public Vector enumInstances(CIMObjectPath op, boolean deep, CIMClass cc)
             throws CIMException {
         if (op.getObjectName().equalsIgnoreCase("Ex_SimpleInstanceProvider")) 
             {
             Vector instances = new Vector();
             CIMObjectPath cop = new CIMObjectPath(op.getObjectName(),
                     op.getNameSpace());
                 if (loop == 0){
                     cop.addKey("First", new CIMValue("red"));
                     cop.addKey("Last", new CIMValue("apple"));
                     // To delete this class, comment this following 
	                    // line and compile it.
                     instances.addElement(cop);
                     loop += 1;
                 } else {
                     cop.addKey("First", new CIMValue("red"));
                     cop.addKey("Last", new CIMValue("apple"));
                     // To delete this class, comment this following 
                     // line and compile it.
                     instances.addElement(cop);
                     cop = new CIMObjectPath(op.getObjectName(),
                             op.getNameSpace());
                     cop.addKey("First", new CIMValue("green"));
                     cop.addKey("Last", new CIMValue("apple"));
                     // To delete this class, comment this following 
                     // line and compile it.
                     instances.addElement(cop);
                 }
             return instances;
             }
         return new Vector();
     }

     public CIMInstance getInstance(CIMObjectPath op, 
             CIMClass cc, boolean localOnly) throws CIMException {
             if (op.getObjectName().equalsIgnoreCase("Ex_SimpleInstanceProvider"))
             {
                 CIMInstance ci = cc.newInstance();
                 ci.setProperty("First", new CIMValue("yellow"));
                 ci.setProperty("Last", new CIMValue("apple"));
                 return ci;
             }
            return new CIMInstance();
      }

     public Vector execQuery(CIMObjectPath op, String query, int ql, CIMClass cc)
             throws CIMException {
                 throw(new CIMException(CIMException.CIM_ERR_NOT_SUPPORTED));
    }

     public void setInstance(CIMObjectPath op, CIMInstance ci)
             throws CIMException {
                 throw(new CIMException(CIMException.CIM_ERR_NOT_SUPPORTED));
    }

     public CIMObjectPath createInstance(CIMObjectPath op, CIMInstance ci)
              throws CIMException {
                 throw(new CIMException(CIMException.CIM_ERR_NOT_SUPPORTED));
    }

     public void deleteInstance(CIMObjectPath cp) throws CIMException {
         throw(new CIMException(CIMException.CIM_ERR_NOT_SUPPORTED));
     }
 }