ImmitableByteArray.java

import com.shamanland.annotations.NonNull;
import com.shamanland.annotations.Nullable;

public final class ImmutableByteArray {
    @NonNull
    private final byte[] bytes;

    @NonNull
    public byte[] getBytes() {
        return bytes.clone();
    }

    public ImmutableByteArray(@NonNull byte[] bytes, int offset, int length) {
        this.bytes = new byte[length];
        System.arraycopy(bytes, offset, this.bytes, 0, length);
    }

    public boolean equalsArray(@Nullable byte[] bytes) {
        if (bytes == null) {
            return false;
        }

        if (this.bytes.length != bytes.length) {
            return false;
        }

        for (int i = 0, n = bytes.length; i < n; i++) {
            if (this.bytes[i] != bytes[i]) {
                return false;
            }
        }

        return true;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        } else if (o == null || getClass() != o.getClass()) {
            return false;
        } else {
            return equalsArray(((ImmutableByteArray) o).bytes);
        }
    }

    @Override
    public int hashCode() {
        int result = 1;

        for (byte element : bytes) {
            result = 31 * result + element;
        }

        return result;
    }
}