1 // Copyright 2012 Google Inc. All Rights Reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #include "polo/pairing/message/configurationmessage.h" 16 17 #include <algorithm> 18 #include <sstream> 19 #include <string> 20 21 namespace polo { 22 namespace pairing { 23 namespace message { 24 25 ConfigurationMessage::ConfigurationMessage( 26 const encoding::EncodingOption& encoding, 27 message::OptionsMessage::ProtocolRole client_role) 28 : PoloMessage(PoloMessage::kConfiguration), 29 encoding_(encoding), 30 client_role_(client_role) { 31 } 32 33 const encoding::EncodingOption& ConfigurationMessage::encoding() const { 34 return encoding_; 35 } 36 37 OptionsMessage::ProtocolRole ConfigurationMessage::client_role() const { 38 return client_role_; 39 } 40 41 std::string ConfigurationMessage::ToString() const { 42 std::ostringstream ss; 43 ss << "[ConfigurationMessage encoding=" << encoding_.ToString() 44 << ", client_role=" << client_role_ << "]"; 45 return ss.str(); 46 } 47 48 ConfigurationMessage* ConfigurationMessage::GetBestConfiguration( 49 const OptionsMessage &local_options, 50 const OptionsMessage &peer_options) { 51 // Compute the intersection of the available encodings. The sets use the 52 // 'less' comparator so they are ordered using EncodingOption's less-than 53 // operator. 54 encoding::EncodingOption::EncodingSet common_outputs; 55 std::insert_iterator<encoding::EncodingOption::EncodingSet> outputs_inserter( 56 common_outputs, 57 common_outputs.begin()); 58 set_intersection(local_options.output_encodings().begin(), 59 local_options.output_encodings().end(), 60 peer_options.output_encodings().begin(), 61 peer_options.output_encodings().end(), 62 outputs_inserter, 63 encoding::EncodingOption::EncodingOptionComparator()); 64 65 encoding::EncodingOption::EncodingSet common_inputs; 66 std::insert_iterator<encoding::EncodingOption::EncodingSet> inputs_inserter( 67 common_inputs, 68 common_inputs.begin()); 69 set_intersection(local_options.input_encodings().begin(), 70 local_options.input_encodings().end(), 71 peer_options.input_encodings().begin(), 72 peer_options.input_encodings().end(), 73 inputs_inserter, 74 encoding::EncodingOption::EncodingOptionComparator()); 75 76 if (common_outputs.size() == 0 || common_inputs.size() == 0) { 77 return NULL; 78 } 79 80 const encoding::EncodingOption* best_input = NULL; 81 const encoding::EncodingOption* best_output = NULL; 82 83 // Use the last option as the best encoding since that one will be the most 84 // complex based on the sorting order. 85 if (common_outputs.size() > 0) { 86 best_output = &*(--common_outputs.end()); 87 } 88 89 if (common_inputs.size() > 0) { 90 best_input = &*(--common_inputs.end()); 91 } 92 93 if (local_options.protocol_role_preference() 94 == OptionsMessage::kDisplayDevice) { 95 if (best_input) { 96 return new ConfigurationMessage(*best_input, 97 OptionsMessage::kDisplayDevice); 98 } else { 99 return new ConfigurationMessage(*best_output, 100 OptionsMessage::kInputDevice); 101 } 102 } else { 103 if (best_output) { 104 return new ConfigurationMessage(*best_output, 105 OptionsMessage::kInputDevice); 106 } else { 107 return new ConfigurationMessage(*best_input, 108 OptionsMessage::kDisplayDevice); 109 } 110 } 111 } 112 113 } // namespace message 114 } // namespace pairing 115 } // namespace polo 116
