org.apache.hudi.common.fs.BoundedFsDataInputStream Maven / Gradle / Ivy
/*
* 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
*/
package org.apache.hudi.common.fs;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
/**
* Implementation of {@link FSDataInputStream} with bound check based on file size.
*/
public class BoundedFsDataInputStream extends FSDataInputStream {
private FileSystem fs;
private Path file;
private long fileLen = -1L;
public BoundedFsDataInputStream(FileSystem fs, Path file, InputStream in) {
super(in);
this.fs = fs;
this.file = file;
}
@Override
public boolean markSupported() {
return false;
}
/* Return the file length */
private long getFileLength() throws IOException {
if (fileLen == -1L) {
fileLen = fs.getContentSummary(file).getLength();
}
return fileLen;
}
@Override
public synchronized void seek(long pos) throws IOException {
if (pos < 0 || pos > getFileLength()) {
throw new EOFException("Try to seek pos[" + pos + "] , but fileSize is " + getFileLength());
}
super.seek(pos);
}
@Override
public synchronized long skip(long n) throws IOException {
long curPos = getPos();
long fileLength = getFileLength();
if (n + curPos > fileLength) {
n = fileLength - curPos;
}
return super.skip(n);
}
}