/*
 * @(#)RoleResult.java	1.27 05/12/01
 * 
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.management.relation;

import java.util.Iterator;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamField;
import java.io.Serializable;

import java.security.AccessController;
import java.security.PrivilegedAction;

import com.sun.jmx.mbeanserver.GetPropertyAction;

/**
 * Represents the result of a multiple access to several roles of a relation
 * (either for reading or writing).
 *
 * <p>The <b>serialVersionUID</b> of this class is <code>-6304063118040985512L</code>.
 * 
 * @since 1.5
 */
public class RoleResult implements Serializable {

    // Serialization compatibility stuff:
    // Two serial forms are supported in this class. The selected form depends
    // on system property "jmx.serial.form":
    //  - "1.0" for JMX 1.0
    //  - any other value for JMX 1.1 and higher
    //
    // Serial version for old serial form 
    private static final long oldSerialVersionUID = 3786616013762091099L;
    //
    // Serial version for new serial form 
    private static final long newSerialVersionUID = -6304063118040985512L;
    //
    // Serializable fields in old serial form
    private static final ObjectStreamField[] oldSerialPersistentFields = 
    {
      new ObjectStreamField("myRoleList", RoleList.class),
      new ObjectStreamField("myRoleUnresList", RoleUnresolvedList.class)
    };
    //
    // Serializable fields in new serial form
    private static final ObjectStreamField[] newSerialPersistentFields = 
    {
      new ObjectStreamField("roleList", RoleList.class),
      new ObjectStreamField("unresolvedRoleList", RoleUnresolvedList.class)
    };
    //
    // Actual serial version and serial form
    private static final long serialVersionUID;
    /**
     * @serialField roleList RoleList List of roles successfully accessed
     * @serialField unresolvedRoleList RoleUnresolvedList List of roles unsuccessfully accessed
     */
    private static final ObjectStreamField[] serialPersistentFields;
    private static boolean compat = false;  
    static {
	try {
	    GetPropertyAction act = new GetPropertyAction("jmx.serial.form");
	    String form = AccessController.doPrivileged(act);
	    compat = (form != null && form.equals("1.0"));
	} catch (Exception e) {
	    // OK : Too bad, no compat with 1.0
	}
	if (compat) {
	    serialPersistentFields = oldSerialPersistentFields;
	    serialVersionUID = oldSerialVersionUID;
	} else {
	    serialPersistentFields = newSerialPersistentFields;
	    serialVersionUID = newSerialVersionUID;
	}
    }
    //
    // END Serialization compatibility stuff

    //
    // Private members
    //

    /**
     * @serial List of roles successfully accessed
     */
    private RoleList roleList = null;

    /**
     * @serial List of roles unsuccessfully accessed
     */
    private RoleUnresolvedList unresolvedRoleList = null;

    //
    // Constructor
    //

    /**
     * Constructor.
     *
     * @param list  list of roles successfully accessed.
     * @param unresolvedList  list of roles not accessed (with problem
     * descriptions).
     */
    public RoleResult(RoleList list,
		      RoleUnresolvedList unresolvedList) {

	setRoles(list);
	setRolesUnresolved(unresolvedList);
	return;
    }

    //
    // Accessors
    //

    /**
     * Retrieves list of roles successfully accessed.
     *
     * @return a RoleList
     *
     * @see #setRoles
     */
    public RoleList getRoles() {
	return roleList;
    }

    /**
     * Retrieves list of roles unsuccessfully accessed.
     *
     * @return a RoleUnresolvedList.
     *
     * @see #setRolesUnresolved
     */
    public RoleUnresolvedList getRolesUnresolved() {
	return unresolvedRoleList;
    }

    /**
     * Sets list of roles successfully accessed.
     *
     * @param list  list of roles successfully accessed
     *
     * @see #getRoles
     */
    public void setRoles(RoleList list) {
	if (list != null) {

	    roleList = new RoleList();

	    for (Iterator roleIter = list.iterator();
		 roleIter.hasNext();) {
		Role currRole = (Role)(roleIter.next());
		roleList.add((Role)(currRole.clone()));
	    }
	} else {
	    roleList = null;
	}
	return;
    }

    /**
     * Sets list of roles unsuccessfully accessed.
     *
     * @param unresolvedList  list of roles unsuccessfully accessed
     *
     * @see #getRolesUnresolved
     */
    public void setRolesUnresolved(RoleUnresolvedList unresolvedList) {
	if (unresolvedList != null) {

	    unresolvedRoleList = new RoleUnresolvedList();

	    for (Iterator roleUnresIter = unresolvedList.iterator();
		 roleUnresIter.hasNext();) {
		RoleUnresolved currRoleUnres =
		    (RoleUnresolved)(roleUnresIter.next());
		unresolvedRoleList.add((RoleUnresolved)(currRoleUnres.clone()));
	    }
	} else {
	    unresolvedRoleList = null;
	}
	return;
    }

    /**
     * Deserializes a {@link RoleResult} from an {@link ObjectInputStream}.
     */
    private void readObject(ObjectInputStream in)
	    throws IOException, ClassNotFoundException {
      if (compat)
      {
        // Read an object serialized in the old serial form
        //
        ObjectInputStream.GetField fields = in.readFields();
	roleList = (RoleList) fields.get("myRoleList", null);
	if (fields.defaulted("myRoleList"))
        {
          throw new NullPointerException("myRoleList");
        }
	unresolvedRoleList = (RoleUnresolvedList) fields.get("myRoleUnresList", null);
	if (fields.defaulted("myRoleUnresList"))
        {
          throw new NullPointerException("myRoleUnresList");
        }
      }
      else
      {
        // Read an object serialized in the new serial form
        //
        in.defaultReadObject();
      }
    }


    /**
     * Serializes a {@link RoleResult} to an {@link ObjectOutputStream}.
     */
    private void writeObject(ObjectOutputStream out)
	    throws IOException {
      if (compat)
      {
        // Serializes this instance in the old serial form
        //
        ObjectOutputStream.PutField fields = out.putFields();
	fields.put("myRoleList", roleList);
	fields.put("myRoleUnresList", unresolvedRoleList);
	out.writeFields();
      }
      else
      {
        // Serializes this instance in the new serial form
        //
        out.defaultWriteObject();
      }
    }
}