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
17package android.net;
18
19import android.content.Context;
20import android.net.IEthernetManager;
21import android.net.IEthernetServiceListener;
22import android.net.IpConfiguration;
23import android.os.Handler;
24import android.os.Message;
25import android.os.RemoteException;
26
27import java.util.ArrayList;
28
29/**
30 * A class representing the IP configuration of the Ethernet network.
31 *
32 * @hide
33 */
34public class EthernetManager {
35    private static final String TAG = "EthernetManager";
36    private static final int MSG_AVAILABILITY_CHANGED = 1000;
37
38    private final Context mContext;
39    private final IEthernetManager mService;
40    private final Handler mHandler = new Handler() {
41        @Override
42        public void handleMessage(Message msg) {
43            if (msg.what == MSG_AVAILABILITY_CHANGED) {
44                boolean isAvailable = (msg.arg1 == 1);
45                for (Listener listener : mListeners) {
46                    listener.onAvailabilityChanged(isAvailable);
47                }
48            }
49        }
50    };
51    private final ArrayList<Listener> mListeners = new ArrayList<Listener>();
52    private final IEthernetServiceListener.Stub mServiceListener =
53            new IEthernetServiceListener.Stub() {
54                @Override
55                public void onAvailabilityChanged(boolean isAvailable) {
56                    mHandler.obtainMessage(
57                            MSG_AVAILABILITY_CHANGED, isAvailable ? 1 : 0, 0, null).sendToTarget();
58                }
59            };
60
61    /**
62     * A listener interface to receive notification on changes in Ethernet.
63     */
64    public interface Listener {
65        /**
66         * Called when Ethernet port's availability is changed.
67         * @param isAvailable {@code true} if one or more Ethernet port exists.
68         */
69        public void onAvailabilityChanged(boolean isAvailable);
70    }
71
72    /**
73     * Create a new EthernetManager instance.
74     * Applications will almost always want to use
75     * {@link android.content.Context#getSystemService Context.getSystemService()} to retrieve
76     * the standard {@link android.content.Context#ETHERNET_SERVICE Context.ETHERNET_SERVICE}.
77     */
78    public EthernetManager(Context context, IEthernetManager service) {
79        mContext = context;
80        mService = service;
81    }
82
83    /**
84     * Get Ethernet configuration.
85     * @return the Ethernet Configuration, contained in {@link IpConfiguration}.
86     */
87    public IpConfiguration getConfiguration() {
88        try {
89            return mService.getConfiguration();
90        } catch (NullPointerException | RemoteException e) {
91            return new IpConfiguration();
92        }
93    }
94
95    /**
96     * Set Ethernet configuration.
97     */
98    public void setConfiguration(IpConfiguration config) {
99        try {
100            mService.setConfiguration(config);
101        } catch (NullPointerException | RemoteException e) {
102        }
103    }
104
105    /**
106     * Indicates whether the system currently has one or more
107     * Ethernet interfaces.
108     */
109    public boolean isAvailable() {
110        try {
111            return mService.isAvailable();
112        } catch (NullPointerException | RemoteException e) {
113            return false;
114        }
115    }
116
117    /**
118     * Adds a listener.
119     * @param listener A {@link Listener} to add.
120     * @throws IllegalArgumentException If the listener is null.
121     */
122    public void addListener(Listener listener) {
123        if (listener == null) {
124            throw new IllegalArgumentException("listener must not be null");
125        }
126        mListeners.add(listener);
127        if (mListeners.size() == 1) {
128            try {
129                mService.addListener(mServiceListener);
130            } catch (NullPointerException | RemoteException e) {
131            }
132        }
133    }
134
135    /**
136     * Removes a listener.
137     * @param listener A {@link Listener} to remove.
138     * @throws IllegalArgumentException If the listener is null.
139     */
140    public void removeListener(Listener listener) {
141        if (listener == null) {
142            throw new IllegalArgumentException("listener must not be null");
143        }
144        mListeners.remove(listener);
145        if (mListeners.isEmpty()) {
146            try {
147                mService.removeListener(mServiceListener);
148            } catch (NullPointerException | RemoteException e) {
149            }
150        }
151    }
152}
153