| /* |
| * 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. |
| */ |
| |
| package org.apache.cassandra.io.util; |
| |
| import java.nio.ByteBuffer; |
| |
| /** |
| * This is the same as DataInputBuffer, i.e. a stream for a fixed byte buffer, |
| * except that we also implement FileDataInput by using an offset and a file path. |
| */ |
| public class FileSegmentInputStream extends DataInputBuffer implements FileDataInput |
| { |
| private final String filePath; |
| private final long offset; |
| |
| public FileSegmentInputStream(ByteBuffer buffer, String filePath, long offset) |
| { |
| super(buffer, false); |
| this.filePath = filePath; |
| this.offset = offset; |
| } |
| |
| public String getPath() |
| { |
| return filePath; |
| } |
| |
| private long size() |
| { |
| return offset + buffer.capacity(); |
| } |
| |
| public boolean isEOF() |
| { |
| return !buffer.hasRemaining(); |
| } |
| |
| public long bytesRemaining() |
| { |
| return buffer.remaining(); |
| } |
| |
| public void seek(long pos) |
| { |
| if (pos < 0 || pos > size()) |
| throw new IllegalArgumentException(String.format("Unable to seek to position %d in %s (%d bytes) in partial mode", |
| pos, |
| getPath(), |
| size())); |
| |
| |
| buffer.position((int) (pos - offset)); |
| } |
| |
| @Override |
| public boolean markSupported() |
| { |
| return false; |
| } |
| |
| public DataPosition mark() |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void reset(DataPosition mark) |
| { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public long bytesPastMark(DataPosition mark) |
| { |
| return 0; |
| } |
| |
| public long getFilePointer() |
| { |
| return offset + buffer.position(); |
| } |
| } |