org.elasticsearch.common.io.stream.ByteBufferStreamInput Maven / Gradle / Ivy
/*
* 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.io.stream;
import java.io.EOFException;
import java.io.IOException;
import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;
public class ByteBufferStreamInput extends StreamInput {
private final ByteBuffer buffer;
public ByteBufferStreamInput(ByteBuffer buffer) {
this.buffer = buffer.mark();
}
@Override
public int read() throws IOException {
if (buffer.hasRemaining() == false) {
return -1;
}
return buffer.get() & 0xFF;
}
@Override
public byte readByte() throws IOException {
try {
return buffer.get();
} catch (BufferUnderflowException ex) {
throw newEOFException(ex);
}
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
if (buffer.hasRemaining() == false) {
return -1;
}
len = Math.min(len, buffer.remaining());
buffer.get(b, off, len);
return len;
}
@Override
public long skip(long n) throws IOException {
int remaining = buffer.remaining();
if (n > remaining) {
buffer.position(buffer.limit());
return remaining;
}
buffer.position((int) (buffer.position() + n));
return n;
}
@Override
public void readBytes(byte[] b, int offset, int len) throws IOException {
try {
buffer.get(b, offset, len);
} catch (BufferUnderflowException ex) {
throw newEOFException(ex);
}
}
@Override
public short readShort() throws IOException {
try {
return buffer.getShort();
} catch (BufferUnderflowException ex) {
throw newEOFException(ex);
}
}
@Override
public int readInt() throws IOException {
try {
return buffer.getInt();
} catch (BufferUnderflowException ex) {
throw newEOFException(ex);
}
}
@Override
public long readLong() throws IOException {
try {
return buffer.getLong();
} catch (BufferUnderflowException ex) {
throw newEOFException(ex);
}
}
private static EOFException newEOFException(RuntimeException ex) {
EOFException eofException = new EOFException();
eofException.initCause(ex);
return eofException;
}
@Override
public void reset() throws IOException {
buffer.reset();
}
@Override
public int available() throws IOException {
return buffer.remaining();
}
@Override
protected void ensureCanReadBytes(int length) throws EOFException {
final int available = buffer.remaining();
if (length > available) {
throwEOF(length, available);
}
}
@Override
public void mark(int readlimit) {
buffer.mark();
}
@Override
public boolean markSupported() {
return true;
}
@Override
public void close() throws IOException {}
}