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/*
* 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.parquet.bytes;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.WritableByteChannel;
import java.util.Arrays;
import java.util.List;
import com.facebook.presto.hive.$internal.org.slf4j.Logger;
import com.facebook.presto.hive.$internal.org.slf4j.LoggerFactory;
/**
* A source of bytes capable of writing itself to an output.
* A BytesInput should be consumed right away.
* It is not a container.
* For example if it is referring to a stream,
* subsequent BytesInput reads from the stream will be incorrect
* if the previous has not been consumed.
*/
abstract public class BytesInput {
private static final Logger LOG = LoggerFactory.getLogger(BytesInput.class);
private static final EmptyBytesInput EMPTY_BYTES_INPUT = new EmptyBytesInput();
/**
* logically concatenate the provided inputs
* @param inputs the inputs to concatenate
* @return a concatenated input
*/
public static BytesInput concat(BytesInput... inputs) {
return new SequenceBytesIn(Arrays.asList(inputs));
}
/**
* logically concatenate the provided inputs
* @param inputs the inputs to concatenate
* @return a concatenated input
*/
public static BytesInput concat(List inputs) {
return new SequenceBytesIn(inputs);
}
/**
* @param in an input stream
* @param bytes number of bytes to read
* @return a BytesInput that will read that number of bytes from the stream
*/
public static BytesInput from(InputStream in, int bytes) {
return new StreamBytesInput(in, bytes);
}
/**
* @param buffers an array of byte buffers
* @return a BytesInput that will read the given bytes from the ByteBuffers
*/
public static BytesInput from(ByteBuffer... buffers) {
if (buffers.length == 1) {
return new ByteBufferBytesInput(buffers[0]);
}
return new BufferListBytesInput(Arrays.asList(buffers));
}
/**
* @param buffers a list of byte buffers
* @return a BytesInput that will read the given bytes from the ByteBuffers
*/
public static BytesInput from(List buffers) {
if (buffers.size() == 1) {
return new ByteBufferBytesInput(buffers.get(0));
}
return new BufferListBytesInput(buffers);
}
/**
*
* @param in a byte array
* @return a Bytes input that will write the given bytes
*/
public static BytesInput from(byte[] in) {
LOG.debug("BytesInput from array of {} bytes", in.length);
return new ByteArrayBytesInput(in, 0 , in.length);
}
public static BytesInput from(byte[] in, int offset, int length) {
LOG.debug("BytesInput from array of {} bytes", length);
return new ByteArrayBytesInput(in, offset, length);
}
/**
* @param intValue the int to write
* @return a BytesInput that will write 4 bytes in little endian
*/
public static BytesInput fromInt(int intValue) {
return new IntBytesInput(intValue);
}
/**
* @param intValue the int to write
* @return a BytesInput that will write var int
*/
public static BytesInput fromUnsignedVarInt(int intValue) {
return new UnsignedVarIntBytesInput(intValue);
}
/**
*
* @param intValue the int to write
* @return a ByteInput that contains the int value as a variable-length zig-zag encoded int
*/
public static BytesInput fromZigZagVarInt(int intValue) {
int zigZag = (intValue << 1) ^ (intValue >> 31);
return new UnsignedVarIntBytesInput(zigZag);
}
/**
* @param longValue the long to write
* @return a BytesInput that will write var long
*/
public static BytesInput fromUnsignedVarLong(long longValue) {
return new UnsignedVarLongBytesInput(longValue);
}
/**
*
* @param longValue the long to write
* @return a ByteInput that contains the long value as a variable-length zig-zag encoded long
*/
public static BytesInput fromZigZagVarLong(long longValue) {
long zigZag = (longValue << 1) ^ (longValue >> 63);
return new UnsignedVarLongBytesInput(zigZag);
}
/**
* @param arrayOut a capacity byte array output stream to wrap into a BytesInput
* @return a BytesInput that will write the content of the buffer
*/
public static BytesInput from(CapacityByteArrayOutputStream arrayOut) {
return new CapacityBAOSBytesInput(arrayOut);
}
/**
* @param baos - stream to wrap into a BytesInput
* @return a BytesInput that will write the content of the buffer
*/
public static BytesInput from(ByteArrayOutputStream baos) {
return new BAOSBytesInput(baos);
}
/**
* @return an empty bytes input
*/
public static BytesInput empty() {
return EMPTY_BYTES_INPUT;
}
/**
* copies the input into a new byte array
* @param bytesInput a BytesInput
* @return a copy of the BytesInput
* @throws IOException if there is an exception when reading bytes from the BytesInput
*/
public static BytesInput copy(BytesInput bytesInput) throws IOException {
return from(bytesInput.toByteArray());
}
/**
* writes the bytes into a stream
* @param out an output stream
* @throws IOException if there is an exception writing
*/
abstract public void writeAllTo(OutputStream out) throws IOException;
/**
*
* @return a new byte array materializing the contents of this input
* @throws IOException if there is an exception reading
*/
public byte[] toByteArray() throws IOException {
BAOS baos = new BAOS((int)size());
this.writeAllTo(baos);
LOG.debug("converted {} to byteArray of {} bytes", size() , baos.size());
return baos.getBuf();
}
/**
*
* @return a new ByteBuffer materializing the contents of this input
* @throws IOException if there is an exception reading
*/
public ByteBuffer toByteBuffer() throws IOException {
return ByteBuffer.wrap(toByteArray());
}
/**
*
* @return a new InputStream materializing the contents of this input
* @throws IOException if there is an exception reading
*/
public ByteBufferInputStream toInputStream() throws IOException {
return ByteBufferInputStream.wrap(toByteBuffer());
}
/**
*
* @return the size in bytes that would be written
*/
abstract public long size();
private static final class BAOS extends ByteArrayOutputStream {
private BAOS(int size) {
super(size);
}
public byte[] getBuf() {
return this.buf;
}
}
private static class StreamBytesInput extends BytesInput {
private static final Logger LOG = LoggerFactory.getLogger(BytesInput.StreamBytesInput.class);
private final InputStream in;
private final int byteCount;
private StreamBytesInput(InputStream in, int byteCount) {
super();
this.in = in;
this.byteCount = byteCount;
}
@Override
public void writeAllTo(OutputStream out) throws IOException {
LOG.debug("write All {} bytes", byteCount);
// TODO: more efficient
out.write(this.toByteArray());
}
public byte[] toByteArray() throws IOException {
LOG.debug("read all {} bytes", byteCount);
byte[] buf = new byte[byteCount];
new DataInputStream(in).readFully(buf);
return buf;
}
@Override
public long size() {
return byteCount;
}
}
private static class SequenceBytesIn extends BytesInput {
private static final Logger LOG = LoggerFactory.getLogger(BytesInput.SequenceBytesIn.class);
private final List inputs;
private final long size;
private SequenceBytesIn(List inputs) {
this.inputs = inputs;
long total = 0;
for (BytesInput input : inputs) {
total += input.size();
}
this.size = total;
}
@SuppressWarnings("unused")
@Override
public void writeAllTo(OutputStream out) throws IOException {
for (BytesInput input : inputs) {
LOG.debug("write {} bytes to out", input.size());
if (input instanceof SequenceBytesIn) LOG.debug("{");
input.writeAllTo(out);
if (input instanceof SequenceBytesIn) LOG.debug("}");
}
}
@Override
public long size() {
return size;
}
}
private static class IntBytesInput extends BytesInput {
private final int intValue;
public IntBytesInput(int intValue) {
this.intValue = intValue;
}
@Override
public void writeAllTo(OutputStream out) throws IOException {
BytesUtils.writeIntLittleEndian(out, intValue);
}
public ByteBuffer toByteBuffer() throws IOException {
return ByteBuffer.allocate(4).putInt(0, intValue);
}
@Override
public long size() {
return 4;
}
}
private static class UnsignedVarIntBytesInput extends BytesInput {
private final int intValue;
public UnsignedVarIntBytesInput(int intValue) {
this.intValue = intValue;
}
@Override
public void writeAllTo(OutputStream out) throws IOException {
BytesUtils.writeUnsignedVarInt(intValue, out);
}
public ByteBuffer toByteBuffer() throws IOException {
ByteBuffer ret = ByteBuffer.allocate((int) size());
BytesUtils.writeUnsignedVarInt(intValue, ret);
return ret;
}
@Override
public long size() {
int s = (38 - Integer.numberOfLeadingZeros(intValue)) / 7;
return s == 0 ? 1 : s;
}
}
private static class UnsignedVarLongBytesInput extends BytesInput {
private final long longValue;
public UnsignedVarLongBytesInput(long longValue) {
this.longValue = longValue;
}
@Override
public void writeAllTo(OutputStream out) throws IOException {
BytesUtils.writeUnsignedVarLong(longValue, out);
}
@Override
public long size() {
int s = (70 - Long.numberOfLeadingZeros(longValue)) / 7;
return s == 0 ? 1 : s;
}
}
private static class EmptyBytesInput extends BytesInput {
@Override
public void writeAllTo(OutputStream out) throws IOException {
}
@Override
public long size() {
return 0;
}
public ByteBuffer toByteBuffer() throws IOException {
return ByteBuffer.allocate(0);
}
}
private static class CapacityBAOSBytesInput extends BytesInput {
private final CapacityByteArrayOutputStream arrayOut;
private CapacityBAOSBytesInput(CapacityByteArrayOutputStream arrayOut) {
this.arrayOut = arrayOut;
}
@Override
public void writeAllTo(OutputStream out) throws IOException {
arrayOut.writeTo(out);
}
@Override
public long size() {
return arrayOut.size();
}
}
private static class BAOSBytesInput extends BytesInput {
private final ByteArrayOutputStream arrayOut;
private BAOSBytesInput(ByteArrayOutputStream arrayOut) {
this.arrayOut = arrayOut;
}
@Override
public void writeAllTo(OutputStream out) throws IOException {
arrayOut.writeTo(out);
}
@Override
public long size() {
return arrayOut.size();
}
}
private static class ByteArrayBytesInput extends BytesInput {
private final byte[] in;
private final int offset;
private final int length;
private ByteArrayBytesInput(byte[] in, int offset, int length) {
this.in = in;
this.offset = offset;
this.length = length;
}
@Override
public void writeAllTo(OutputStream out) throws IOException {
out.write(in, offset, length);
}
public ByteBuffer toByteBuffer() throws IOException {
return java.nio.ByteBuffer.wrap(in, offset, length);
}
@Override
public long size() {
return length;
}
}
private static class BufferListBytesInput extends BytesInput {
private final List buffers;
private final long length;
public BufferListBytesInput(List buffers) {
this.buffers = buffers;
long totalLen = 0;
for (ByteBuffer buffer : buffers) {
totalLen += buffer.remaining();
}
this.length = totalLen;
}
@Override
public void writeAllTo(OutputStream out) throws IOException {
WritableByteChannel channel = Channels.newChannel(out);
for (ByteBuffer buffer : buffers) {
channel.write(buffer.duplicate());
}
}
@Override
public ByteBufferInputStream toInputStream() {
return ByteBufferInputStream.wrap(buffers);
}
@Override
public long size() {
return length;
}
}
private static class ByteBufferBytesInput extends BytesInput {
private final ByteBuffer buffer;
private ByteBufferBytesInput(ByteBuffer buffer) {
this.buffer = buffer;
}
@Override
public void writeAllTo(OutputStream out) throws IOException {
Channels.newChannel(out).write(buffer.duplicate());
}
@Override
public ByteBufferInputStream toInputStream() {
return ByteBufferInputStream.wrap(buffer);
}
@Override
public long size() {
return buffer.remaining();
}
}
}
