com.google.cloud.dataflow.sdk.coders.BigEndianLongCoder Maven / Gradle / Ivy
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Google Cloud Dataflow Java SDK provides a simple, Java-based
interface for processing virtually any size data using Google cloud
resources. This artifact includes entire Dataflow Java SDK.
/*
* Copyright (C) 2015 Google Inc.
*
* Licensed 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 com.google.cloud.dataflow.sdk.coders;
import com.fasterxml.jackson.annotation.JsonCreator;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UTFDataFormatException;
/**
* A {@link BigEndianLongCoder} encodes {@link Long}s in 8 bytes, big-endian.
*/
public class BigEndianLongCoder extends AtomicCoder {
@JsonCreator
public static BigEndianLongCoder of() {
return INSTANCE;
}
/////////////////////////////////////////////////////////////////////////////
private static final BigEndianLongCoder INSTANCE = new BigEndianLongCoder();
private BigEndianLongCoder() {}
@Override
public void encode(Long value, OutputStream outStream, Context context)
throws IOException, CoderException {
if (value == null) {
throw new CoderException("cannot encode a null Long");
}
new DataOutputStream(outStream).writeLong(value);
}
@Override
public Long decode(InputStream inStream, Context context)
throws IOException, CoderException {
try {
return new DataInputStream(inStream).readLong();
} catch (EOFException | UTFDataFormatException exn) {
// These exceptions correspond to decoding problems, so change
// what kind of exception they're branded as.
throw new CoderException(exn);
}
}
/**
* {@inheritDoc}
*
* @return {@code true}. This coder is injective.
*/
@Override
public boolean consistentWithEquals() {
return true;
}
/**
* {@inheritDoc}
*
* @return {@code true}, since {@link #getEncodedElementByteSize} returns a constant.
*/
@Override
public boolean isRegisterByteSizeObserverCheap(Long value, Context context) {
return true;
}
/**
* {@inheritDoc}
*
* @return {@code 8}, the byte size of a big-endian encoded {@code Long}.
*/
@Override
protected long getEncodedElementByteSize(Long value, Context context)
throws Exception {
if (value == null) {
throw new CoderException("cannot encode a null Long");
}
return 8;
}
}