org.elasticsearch.common.lucene.store.InputStreamIndexInput Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch Show documentation
Show all versions of elasticsearch Show documentation
Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.common.lucene.store;
import org.apache.lucene.store.IndexInput;
import java.io.IOException;
import java.io.InputStream;
public class InputStreamIndexInput extends InputStream {
private final IndexInput indexInput;
private final long limit;
private final long actualSizeToRead;
private long counter = 0;
private long markPointer;
private long markCounter;
public InputStreamIndexInput(IndexInput indexInput, long limit) {
this.indexInput = indexInput;
this.limit = limit;
if ((indexInput.length() - indexInput.getFilePointer()) > limit) {
actualSizeToRead = limit;
} else {
actualSizeToRead = indexInput.length() - indexInput.getFilePointer();
}
}
public long actualSizeToRead() {
return actualSizeToRead;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
if (b == null) {
throw new NullPointerException();
} else if (off < 0 || len < 0 || len > b.length - off) {
throw new IndexOutOfBoundsException();
}
if (indexInput.getFilePointer() >= indexInput.length()) {
return -1;
}
if (indexInput.getFilePointer() + len > indexInput.length()) {
len = (int) (indexInput.length() - indexInput.getFilePointer());
}
if (counter + len > limit) {
len = (int) (limit - counter);
}
if (len <= 0) {
return -1;
}
indexInput.readBytes(b, off, len, false);
counter += len;
return len;
}
@Override
public int read() throws IOException {
if (counter++ >= limit) {
return -1;
}
return (indexInput.getFilePointer() < indexInput.length()) ? (indexInput.readByte() & 0xff) : -1;
}
@Override
public boolean markSupported() {
return true;
}
@Override
public synchronized void mark(int readlimit) {
markPointer = indexInput.getFilePointer();
markCounter = counter;
}
@Override
public synchronized void reset() throws IOException {
indexInput.seek(markPointer);
counter = markCounter;
}
}