log4j-api/src/main/java/org/apache/logging/log4j/spi/CopyOnWriteSortedArrayThreadContextMap.java [229:270]:
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    @Override
    public Map<String, String> getImmutableMapOrNull() {
        final StringMap map = localMap.get();
        return map == null ? null : Collections.unmodifiableMap(map.toMap());
    }

    @Override
    public boolean isEmpty() {
        final StringMap map = localMap.get();
        return map == null || map.isEmpty();
    }

    @Override
    public String toString() {
        final StringMap map = localMap.get();
        return map == null ? "{}" : map.toString();
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        final StringMap map = this.localMap.get();
        result = prime * result + ((map == null) ? 0 : map.hashCode());
        return result;
    }

    @Override
    public boolean equals(final Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof ThreadContextMap)) {
            return false;
        }
        final ThreadContextMap other = (ThreadContextMap) obj;
        final Map<String, String> map = this.getImmutableMapOrNull();
        final Map<String, String> otherMap = other.getImmutableMapOrNull();
        return Objects.equals(map, otherMap);
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log4j-api/src/main/java/org/apache/logging/log4j/spi/GarbageFreeSortedArrayThreadContextMap.java [221:262]:
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    @Override
    public Map<String, String> getImmutableMapOrNull() {
        final StringMap map = localMap.get();
        return map == null ? null : Collections.unmodifiableMap(map.toMap());
    }

    @Override
    public boolean isEmpty() {
        final StringMap map = localMap.get();
        return map == null || map.isEmpty();
    }

    @Override
    public String toString() {
        final StringMap map = localMap.get();
        return map == null ? "{}" : map.toString();
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        final StringMap map = this.localMap.get();
        result = prime * result + ((map == null) ? 0 : map.hashCode());
        return result;
    }

    @Override
    public boolean equals(final Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (!(obj instanceof ThreadContextMap)) {
            return false;
        }
        final ThreadContextMap other = (ThreadContextMap) obj;
        final Map<String, String> map = this.getImmutableMapOrNull();
        final Map<String, String> otherMap = other.getImmutableMapOrNull();
        return Objects.equals(map, otherMap);
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