Coverage Summary for Class: BlockAccessor (co.rsk.pcc.blockheader)
Class |
Class, %
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Method, %
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Line, %
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BlockAccessor |
0%
(0/1)
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0%
(0/2)
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0%
(0/11)
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1 /*
2 * This file is part of RskJ
3 * Copyright (C) 2019 RSK Labs Ltd.
4 * (derived from ethereumJ library, Copyright (c) 2016 <ether.camp>)
5 *
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU Lesser General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20 package co.rsk.pcc.blockheader;
21
22 import co.rsk.pcc.ExecutionEnvironment;
23 import co.rsk.pcc.exception.NativeContractIllegalArgumentException;
24 import org.ethereum.core.Block;
25
26 import java.util.Optional;
27
28 /**
29 * Helper class to provide Block access to the BlockHeaderContract native methods.
30 *
31 * @author Diego Masini
32 */
33 public class BlockAccessor {
34 private final short maximumBlockDepth;
35
36 public BlockAccessor(short maximumBlockDepth) {
37 this.maximumBlockDepth = maximumBlockDepth;
38 }
39
40 public Optional<Block> getBlock(short blockDepth, ExecutionEnvironment environment) throws NativeContractIllegalArgumentException {
41 if (blockDepth < 0) {
42 throw new NativeContractIllegalArgumentException(String.format(
43 "Invalid block depth '%d' (should be a non-negative value)",
44 blockDepth
45 ));
46 }
47
48 // If blockDepth is bigger or equal to the max depth, return an empty optional instead of throwing an exception
49 // to allow users of this method to decide if they want to throw an exception or return a default
50 // (probably empty) value (e.g. an empty byte array).
51 if (blockDepth >= maximumBlockDepth) {
52 return Optional.empty();
53 }
54
55 // If block is null, return an empty optional instead of throwing an exception to allow users of this method to
56 // decide if they want to throw an exception or return a default (probably empty) value (e.g. an empty byte array).
57 Block block = environment.getBlockStore().getBlockAtDepthStartingAt(blockDepth, environment.getBlock().getParentHash().getBytes());
58 if (block == null) {
59 return Optional.empty();
60 }
61
62 return Optional.of(block);
63 }
64 }