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      1 /*
      2  * Copyright (C) 2009 Google Inc.  All rights reserved.
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.google.polo.pairing;
     18 
     19 import com.google.polo.exception.NoConfigurationException;
     20 import com.google.polo.exception.PoloException;
     21 import com.google.polo.pairing.message.ConfigurationAckMessage;
     22 import com.google.polo.pairing.message.ConfigurationMessage;
     23 import com.google.polo.pairing.message.EncodingOption;
     24 import com.google.polo.pairing.message.OptionsMessage.ProtocolRole;
     25 import com.google.polo.pairing.message.PairingRequestAckMessage;
     26 import com.google.polo.pairing.message.PairingRequestMessage;
     27 import com.google.polo.pairing.message.PoloMessage.PoloMessageType;
     28 import com.google.polo.wire.PoloWireInterface;
     29 
     30 import java.io.IOException;
     31 
     32 /**
     33  * Pairing session state machine implementation for a server.
     34  */
     35 public class ServerPairingSession extends PairingSession {
     36   /**
     37    * Optional server name.
     38    */
     39   private final String mServerName;
     40 
     41   public ServerPairingSession(PoloWireInterface protocol,
     42       PairingContext context) {
     43     this(protocol, context, null);
     44   }
     45 
     46   public ServerPairingSession(PoloWireInterface protocol,
     47       PairingContext context, String serverName) {
     48     super(protocol, context);
     49     mServerName = serverName;
     50   }
     51 
     52   @Override
     53   protected void doInitializationPhase() throws PoloException, IOException {
     54     logDebug("Waiting for PairingRequest...");
     55     PairingRequestMessage request = (PairingRequestMessage)
     56         getNextMessage(PoloMessageType.PAIRING_REQUEST);
     57 
     58     logDebug("Requested service to pair: " + request.getServiceName());
     59     mServiceName = request.getServiceName();
     60 
     61     if (request.hasClientName()) {
     62       logDebug("Client name: " + request.getClientName());
     63       mPeerName = request.getClientName();
     64     } else {
     65       mPeerName = null;
     66     }
     67 
     68     logDebug("Sending PairingRequestAck ...");
     69     PairingRequestAckMessage ack = new PairingRequestAckMessage(mServerName);
     70     sendMessage(ack);
     71 
     72     logDebug("Waiting for Options ...");
     73     // Nothing to do with these; the client is responsible for intersecting
     74     // our options with its, and proposing a valid configuration.
     75     getNextMessage(PoloMessageType.OPTIONS);
     76 
     77     logDebug("Sending Options...");
     78     sendMessage(mLocalOptions);
     79   }
     80 
     81   @Override
     82   protected void doConfigurationPhase() throws PoloException, IOException {
     83     logDebug("Waiting for Configuration...");
     84     setConfiguration((ConfigurationMessage) getNextMessage(
     85         PoloMessageType.CONFIGURATION));
     86 
     87     // Verify the configuration
     88     EncodingOption encoding = mSessionConfig.getEncoding();
     89 
     90     if (getLocalRole() == ProtocolRole.DISPLAY_DEVICE) {
     91       if (!mLocalOptions.supportsOutputEncoding(encoding)) {
     92         throw new NoConfigurationException("Cannot support requested  " +
     93             "output encoding: " + encoding.getType());
     94       }
     95     } else if (getLocalRole() == ProtocolRole.INPUT_DEVICE) {
     96       if (!mLocalOptions.supportsInputEncoding(encoding)) {
     97         throw new NoConfigurationException("Cannot support requested " +
     98             "input encoding: " + encoding.getType());
     99       }
    100     } else {
    101       throw new IllegalStateException(); // should never happen
    102     }
    103 
    104     // Configuration accepted
    105     logDebug("Sending ConfigurationAck...");
    106     sendMessage(new ConfigurationAckMessage());
    107   }
    108 
    109   /**
    110    * Returns {@code true} if server name is set.
    111    */
    112   public boolean hasServerName() {
    113     return mServerName != null;
    114   }
    115 
    116   /**
    117    * Returns {@code true} if client name is set.
    118    */
    119   public boolean hasClientName() {
    120     return hasPeerName();
    121   }
    122 
    123   /**
    124    * Returns server name, or {@code null} if not set.
    125    */
    126   public String getServerName() {
    127     return mServerName;
    128   }
    129 
    130   /**
    131    * Returns client name, or {@code null} if not set.
    132    */
    133   public String getClientName() {
    134     return getPeerName();
    135   }
    136 }
    137