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Scope is a APM for tests to give engineering teams unprecedented visibility into their CI process to quickly identify, troubleshoot and fix failed builds. This artifact contains dependencies for Scope.

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package com.undefinedlabs.scope.deps.okhttp3.internal.http2;

import java.util.Arrays;

public final class Settings {
    /**
     * From the HTTP/2 specs, the default initial window size for all streams is 64 KiB. (Chrome 25
     * uses 10 MiB).
     */
    static final int DEFAULT_INITIAL_WINDOW_SIZE = 65535;

    /** HTTP/2: Size in bytes of the table used to decode the sender's header blocks. */
    static final int HEADER_TABLE_SIZE = 1;
    /** HTTP/2: The peer must not send a PUSH_PROMISE frame when this is 0. */
    static final int ENABLE_PUSH = 2;
    /** Sender's maximum number of concurrent streams. */
    static final int MAX_CONCURRENT_STREAMS = 4;
    /** HTTP/2: Size in bytes of the largest frame payload the sender will accept. */
    static final int MAX_FRAME_SIZE = 5;
    /** HTTP/2: Advisory only. Size in bytes of the largest header list the sender will accept. */
    static final int MAX_HEADER_LIST_SIZE = 6;
    /** Window size in bytes. */
    static final int INITIAL_WINDOW_SIZE = 7;

    /** Total number of settings. */
    static final int COUNT = 10;

    /** Bitfield of which flags that values. */
    private int set;

    /** Flag values. */
    private final int[] values = new int[COUNT];

    void clear() {
        set = 0;
        Arrays.fill(values, 0);
    }

    Settings set(int id, int value) {
        if (id >= values.length) {
            return this; // Discard unknown settings.
        }

        int bit = 1 << id;
        set |= bit;
        values[id] = value;
        return this;
    }

    /** Returns true if a value has been assigned for the setting {@code id}. */
    boolean isSet(int id) {
        int bit = 1 << id;
        return (set & bit) != 0;
    }

    /** Returns the value for the setting {@code id}, or 0 if unset. */
    int get(int id) {
        return values[id];
    }

    /** Returns the number of settings that have values assigned. */
    int size() {
        return Integer.bitCount(set);
    }

    /** Returns -1 if unset. */
    int getHeaderTableSize() {
        int bit = 1 << HEADER_TABLE_SIZE;
        return (bit & set) != 0 ? values[HEADER_TABLE_SIZE] : -1;
    }

    // TODO: honor this setting.
    boolean getEnablePush(boolean defaultValue) {
        int bit = 1 << ENABLE_PUSH;
        return ((bit & set) != 0 ? values[ENABLE_PUSH] : defaultValue ? 1 : 0) == 1;
    }

    int getMaxConcurrentStreams(int defaultValue) {
        int bit = 1 << MAX_CONCURRENT_STREAMS;
        return (bit & set) != 0 ? values[MAX_CONCURRENT_STREAMS] : defaultValue;
    }

    int getMaxFrameSize(int defaultValue) {
        int bit = 1 << MAX_FRAME_SIZE;
        return (bit & set) != 0 ? values[MAX_FRAME_SIZE] : defaultValue;
    }

    int getMaxHeaderListSize(int defaultValue) {
        int bit = 1 << MAX_HEADER_LIST_SIZE;
        return (bit & set) != 0 ? values[MAX_HEADER_LIST_SIZE] : defaultValue;
    }

    int getInitialWindowSize() {
        int bit = 1 << INITIAL_WINDOW_SIZE;
        return (bit & set) != 0 ? values[INITIAL_WINDOW_SIZE] : DEFAULT_INITIAL_WINDOW_SIZE;
    }

    /**
     * Writes {@code other} into this. If any setting is populated by this and {@code other}, the
     * value and flags from {@code other} will be kept.
     */
    void merge(Settings other) {
        for (int i = 0; i < COUNT; i++) {
            if (!other.isSet(i)) continue;
            set(i, other.get(i));
        }
    }
}