| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "Exception.h" |
| #include "ExceptionInternal.h" |
| #include "LocatedBlock.h" |
| #include "LocatedBlocks.h" |
| |
| #include <algorithm> |
| #include <cassert> |
| #include <iostream> |
| |
| namespace hdfs { |
| namespace internal { |
| |
| const LocatedBlock *LocatedBlocksImpl::findBlock(int64_t position) { |
| if (position < fileLength) { |
| LocatedBlock target(position); |
| std::vector<LocatedBlock>::iterator bound; |
| |
| if (blocks.empty()) { |
| return NULL; |
| } |
| |
| /* |
| * up is the first block which offset is not less than position. |
| */ |
| bound = std::lower_bound(blocks.begin(), blocks.end(), target, |
| std::less<LocatedBlock>()); |
| assert(bound == blocks.end() || bound->getOffset() >= position); |
| LocatedBlock * retval = NULL; |
| |
| if (bound == blocks.end()) { |
| retval = &blocks.back(); |
| } else if (bound->getOffset() > position) { |
| --bound; |
| retval = &(*bound); |
| } else { |
| retval = &(*bound); |
| } |
| |
| if (position < retval->getOffset() |
| || position >= retval->getOffset() + retval->getNumBytes()) { |
| return NULL; |
| } |
| |
| return retval; |
| } else { |
| return lastBlock.get(); |
| } |
| } |
| |
| } |
| } |