/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership. The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at
    * 
   *      http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.river.reggie.proxy;
  
  import org.apache.river.proxy.ConstrainableProxyUtil;
  import java.io.IOException;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutputStream;
  import net.jini.core.constraint.MethodConstraints;
  import net.jini.core.constraint.RemoteMethodControl;
  import net.jini.security.proxytrust.ProxyTrustIterator;
  import net.jini.security.proxytrust.SingletonProxyTrustIterator;
  import org.apache.river.api.io.AtomicSerial;
  import org.apache.river.api.io.AtomicSerial.GetArg;
  
  /**
   * Registration subclass that supports constraints.
   *
   * @author Sun Microsystems, Inc.
   *
   */
  @AtomicSerial
  final class ConstrainableRegistration
      extends Registration implements RemoteMethodControl
  {
      private static final long serialVersionUID = 2L;
  
      /** Client constraints for this proxy, or null */
      private final MethodConstraints constraints;
  
      private static MethodConstraints check(GetArg arg) throws IOException {
  	MethodConstraints constraints = (MethodConstraints) arg.get("constraints", null);
  	Registration reg = new Registration(arg);
  	MethodConstraints proxyCon = null;
  	if (reg.server instanceof RemoteMethodControl && 
  	    (proxyCon = ((RemoteMethodControl)reg.server).getConstraints()) != null) {
  	    // Constraints set during proxy deserialization.
  	    return ConstrainableProxyUtil.reverseTranslateConstraints(
  		    proxyCon, methodMappings);
  	}
  	ConstrainableProxyUtil.verifyConsistentConstraints(
  	    constraints, reg.server, methodMappings);
  	return constraints;
      }
     
      ConstrainableRegistration(GetArg arg) throws IOException {
  	this(arg, check(arg));
      }
      
      ConstrainableRegistration(GetArg arg, MethodConstraints constraints) throws IOException{
  	super(arg);
  	this.constraints = constraints;
      }
  
      /**
       * Creates new ConstrainableRegistration with given server reference,
       * service lease and client constraints.
       */
      ConstrainableRegistration(  Registrar server,
  			      ServiceLease lease,
  				MethodConstraints constraints,
  				boolean setConstraints)
      {
  	super( setConstraints ? (Registrar) ((RemoteMethodControl) server).setConstraints(
  		  translateConstraints(constraints)): server,lease);
  	this.constraints = constraints;
      }
  
      // javadoc inherited from RemoteMethodControl.setConstraints
      @Override
      public RemoteMethodControl setConstraints(MethodConstraints constraints) {
  	return new ConstrainableRegistration(server, lease, constraints, true);
      }
  
      // javadoc inherited from RemoteMethodControl.getConstraints
      @Override
      public MethodConstraints getConstraints() {
  	return constraints;
      }
  
      /**
       * Returns iterator used by ProxyTrustVerifier to retrieve a trust verifier
       * for this object.
       */
     private ProxyTrustIterator getProxyTrustIterator() {
 	return new SingletonProxyTrustIterator(server);
     }
 
     private void writeObject(ObjectOutputStream out) throws IOException {
 	out.defaultWriteObject();
     }
 
     /**
      * Verifies that the client constraints for this proxy are consistent with
      * those set on the underlying server ref.
      */
     private void readObject(ObjectInputStream in)
 	throws IOException, ClassNotFoundException
     {
 	in.defaultReadObject();
 	ConstrainableProxyUtil.verifyConsistentConstraints(
 	    constraints, server, methodMappings);
     }
 }