Move NetworkStatsFactory to faster ProcFileReader.

import com.android.internal.util.ProcFileReader;

import com.google.android.collect.Lists;

import com.google.android.collect.Maps;

import com.google.android.collect.Sets;

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.HashSet;

import java.util.StringTokenizer;

    /** Path to {@code /proc/net/xt_qtaguid/stats}. */

    private final File mStatsXtUid;

    /** {@link #mStatsXtUid} and {@link #mStatsXtIfaceAll} headers. */

    private static final String KEY_IDX = "idx";

    private static final String KEY_IFACE = "iface";

    private static final String KEY_ACTIVE = "active";

    private static final String KEY_UID = "uid_tag_int";

    private static final String KEY_COUNTER_SET = "cnt_set";

    private static final String KEY_TAG_HEX = "acct_tag_hex";

    private static final String KEY_SNAP_RX_BYTES = "snap_rx_bytes";

    private static final String KEY_SNAP_RX_PACKETS = "snap_rx_packets";

    private static final String KEY_SNAP_TX_BYTES = "snap_tx_bytes";

    private static final String KEY_SNAP_TX_PACKETS = "snap_tx_packets";

    private static final String KEY_RX_BYTES = "rx_bytes";

    private static final String KEY_RX_PACKETS = "rx_packets";

    private static final String KEY_TX_BYTES = "tx_bytes";

    private static final String KEY_TX_PACKETS = "tx_packets";

    public NetworkStatsFactory() {

        this(new File("/proc/"));

    }

        final NetworkStats stats = new NetworkStats(SystemClock.elapsedRealtime(), 6);

        final NetworkStats.Entry entry = new NetworkStats.Entry();

        // TODO: transition to ProcFileReader

        // TODO: read directly from proc once headers are added

        final ArrayList<String> keys = Lists.newArrayList(KEY_IFACE, KEY_ACTIVE, KEY_SNAP_RX_BYTES,

                KEY_SNAP_RX_PACKETS, KEY_SNAP_TX_BYTES, KEY_SNAP_TX_PACKETS, KEY_RX_BYTES,

                KEY_RX_PACKETS, KEY_TX_BYTES, KEY_TX_PACKETS);

        final ArrayList<String> values = Lists.newArrayList();

        final HashMap<String, String> parsed = Maps.newHashMap();

        BufferedReader reader = null;

        ProcFileReader reader = null;

        try {

            reader = new BufferedReader(new FileReader(mStatsXtIfaceAll));

            reader = new ProcFileReader(new FileInputStream(mStatsXtIfaceAll));

            String line;

            while ((line = reader.readLine()) != null) {

                splitLine(line, values);

                parseLine(keys, values, parsed);

                entry.iface = parsed.get(KEY_IFACE);

            while (reader.hasMoreData()) {

                entry.iface = reader.nextString();

                entry.uid = UID_ALL;

                entry.set = SET_DEFAULT;

                entry.tag = TAG_NONE;

                final boolean active = reader.nextInt() != 0;

                // always include snapshot values

                entry.rxBytes = getParsedLong(parsed, KEY_SNAP_RX_BYTES);

                entry.rxPackets = getParsedLong(parsed, KEY_SNAP_RX_PACKETS);

                entry.txBytes = getParsedLong(parsed, KEY_SNAP_TX_BYTES);

                entry.txPackets = getParsedLong(parsed, KEY_SNAP_TX_PACKETS);

                entry.rxBytes = reader.nextLong();

                entry.rxPackets = reader.nextLong();

                entry.txBytes = reader.nextLong();

                entry.txPackets = reader.nextLong();

                // fold in active numbers, but only when active

                final boolean active = getParsedInt(parsed, KEY_ACTIVE) != 0;

                if (active) {

                    entry.rxBytes += getParsedLong(parsed, KEY_RX_BYTES);

                    entry.rxPackets += getParsedLong(parsed, KEY_RX_PACKETS);

                    entry.txBytes += getParsedLong(parsed, KEY_TX_BYTES);

                    entry.txPackets += getParsedLong(parsed, KEY_TX_PACKETS);

                    entry.rxBytes += reader.nextLong();

                    entry.rxPackets += reader.nextLong();

                    entry.txBytes += reader.nextLong();

                    entry.txPackets += reader.nextLong();

                }

                stats.addValues(entry);

                reader.finishLine();

            }

        } catch (NullPointerException e) {

            throw new IllegalStateException("problem parsing stats: " + e);

        return stats;

    }

    @Deprecated

    private static int getParsedInt(HashMap<String, String> parsed, String key) {

        final String value = parsed.get(key);

        return value != null ? Integer.parseInt(value) : 0;

    }

    @Deprecated

    private static long getParsedLong(HashMap<String, String> parsed, String key) {

        final String value = parsed.get(key);

        return value != null ? Long.parseLong(value) : 0;

    }

    /**

     * Split given line into {@link ArrayList}.

     */

        }

    }

    /**

     * Zip the two given {@link ArrayList} as key and value pairs into

     * {@link HashMap}.

     */

    @Deprecated

    private static void parseLine(

            ArrayList<String> keys, ArrayList<String> values, HashMap<String, String> outParsed) {

        outParsed.clear();

        final int size = Math.min(keys.size(), values.size());

        for (int i = 0; i < size; i++) {

            outParsed.put(keys.get(i), values.get(i));

        }

    }

    /**

     * Utility method to read a single plain-text {@link Long} from the given

     * {@link File}, usually from a {@code /proc/} filesystem.