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      1 /*
      2  * Copyright (c) 2014, The Android Open Source Project
      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 android.net.wifi;
     18 
     19 import android.os.Parcel;
     20 import android.os.Parcelable;
     21 
     22 /**
     23  * Wifi Channel
     24  *
     25  * @see ScanSettings
     26  *
     27  * @hide
     28  */
     29 public class WifiChannel implements Parcelable {
     30 
     31     private static final int MIN_FREQ_MHZ = 2412;
     32     private static final int MAX_FREQ_MHZ = 5825;
     33 
     34     private static final int MIN_CHANNEL_NUM = 1;
     35     private static final int MAX_CHANNEL_NUM = 196;
     36 
     37     /** frequency */
     38     public int freqMHz;
     39 
     40     /** channel number */
     41     public int channelNum;
     42 
     43     /** is it a DFS channel? */
     44     public boolean isDFS;
     45 
     46     /** public constructor */
     47     public WifiChannel() { }
     48 
     49     /** check for validity */
     50     public boolean isValid() {
     51         if (freqMHz < MIN_FREQ_MHZ || freqMHz > MAX_FREQ_MHZ) return false;
     52         if (channelNum < MIN_CHANNEL_NUM || channelNum > MAX_CHANNEL_NUM) return false;
     53         return true;
     54     }
     55 
     56     /** implement Parcelable interface */
     57     @Override
     58     public int describeContents() {
     59         return 0;
     60     }
     61 
     62     /** implement Parcelable interface */
     63     @Override
     64     public void writeToParcel(Parcel out, int flags) {
     65         out.writeInt(freqMHz);
     66         out.writeInt(channelNum);
     67         out.writeInt(isDFS ? 1 : 0);
     68     }
     69 
     70     /** implement Parcelable interface */
     71     public static final Parcelable.Creator<WifiChannel> CREATOR =
     72             new Parcelable.Creator<WifiChannel>() {
     73         @Override
     74         public WifiChannel createFromParcel(Parcel in) {
     75             WifiChannel channel = new WifiChannel();
     76             channel.freqMHz = in.readInt();
     77             channel.channelNum = in.readInt();
     78             channel.isDFS = in.readInt() != 0;
     79             return channel;
     80         }
     81 
     82         @Override
     83         public WifiChannel[] newArray(int size) {
     84             return new WifiChannel[size];
     85         }
     86     };
     87 }
     88