ANQPData.java revision 5bee0e4616e2f8025d60cbfe3eec3e274a68a452 
1package com.android.server.wifi.hotspot2;
2
3import com.android.server.wifi.anqp.ANQPElement;
4import com.android.server.wifi.anqp.Constants;
5
6import java.util.Collections;
7import java.util.Map;
8
9public class ANQPData {
10    /**
11     * The regular cache time for entries with a non-zero domain id.
12     */
13    private static final long ANQP_QUALIFIED_CACHE_TIMEOUT = 3600000L;
14    /**
15     * The cache time for entries with a zero domain id. The zero domain id indicates that ANQP
16     * data from the AP may change at any time, thus a relatively short cache time is given to
17     * such data, but still long enough to avoid excessive querying.
18     */
19    private static final long ANQP_UNQUALIFIED_CACHE_TIMEOUT = 60000L;
20    /**
21     * This is the hold off time for pending queries, i.e. the time during which subsequent queries
22     * are squelched.
23     */
24    private static final long ANQP_HOLDOFF_TIME = 10000L;
25
26    private final NetworkDetail mNetwork;
27    private final Map<Constants.ANQPElementType, ANQPElement> mANQPElements;
28    private final long mCtime;
29    private final long mExpiry;
30
31    public ANQPData(NetworkDetail network,
32                    Map<Constants.ANQPElementType, ANQPElement> anqpElements) {
33
34        mNetwork = network;
35        mANQPElements = anqpElements != null ? Collections.unmodifiableMap(anqpElements) : null;
36        mCtime = System.currentTimeMillis();
37        if (anqpElements == null) {
38            mExpiry = mCtime + ANQP_HOLDOFF_TIME;
39        }
40        else if (network.getAnqpDomainID() == 0) {
41            mExpiry = mCtime + ANQP_UNQUALIFIED_CACHE_TIMEOUT;
42        }
43        else {
44            mExpiry = mCtime + ANQP_QUALIFIED_CACHE_TIMEOUT;
45        }
46    }
47
48    public Map<Constants.ANQPElementType, ANQPElement> getANQPElements() {
49        return Collections.unmodifiableMap(mANQPElements);
50    }
51
52    public NetworkDetail getNetwork() {
53        return mNetwork;
54    }
55
56    public boolean expired() {
57        return expired(System.currentTimeMillis());
58    }
59
60    public boolean expired(long at) {
61        return mExpiry <= at;
62    }
63
64    protected boolean isValid(NetworkDetail nwk) {
65        return mANQPElements != null &&
66                nwk.getAnqpDomainID() == mNetwork.getAnqpDomainID() &&
67                mExpiry > System.currentTimeMillis();
68    }
69
70    @Override
71    public String toString() {
72        StringBuilder sb = new StringBuilder();
73        sb.append(mNetwork.toKeyString()).append(", domid ").append(mNetwork.getAnqpDomainID());
74        if (mANQPElements == null) {
75            sb.append(", unresolved, ");
76        }
77        else {
78            sb.append(", ").append(mANQPElements.size()).append(" elements, ");
79        }
80        long now = System.currentTimeMillis();
81        sb.append(Utils.toHMS(now-mCtime)).append(" old, expires in ").
82                append(Utils.toHMS(mExpiry-now)).append(' ');
83        sb.append(expired(now) ? 'x' : '-');
84        sb.append(mANQPElements == null ? 'u' : '-');
85        return sb.toString();
86    }
87}
88