| /* |
| * 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.beam.sdk.coders; |
| |
| 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; |
| import org.apache.beam.sdk.values.TypeDescriptor; |
| |
| /** A {@link BigEndianShortCoder} encodes {@link Short Shorts} in 2 bytes, big-endian. */ |
| public class BigEndianShortCoder extends AtomicCoder<Short> { |
| |
| public static BigEndianShortCoder of() { |
| return INSTANCE; |
| } |
| |
| ///////////////////////////////////////////////////////////////////////////// |
| |
| private static final BigEndianShortCoder INSTANCE = new BigEndianShortCoder(); |
| private static final TypeDescriptor<Short> TYPE_DESCRIPTOR = new TypeDescriptor<Short>() {}; |
| |
| private BigEndianShortCoder() {} |
| |
| @Override |
| public void encode(Short value, OutputStream outStream) throws IOException { |
| if (value == null) { |
| throw new CoderException("cannot encode a null Short"); |
| } |
| new DataOutputStream(outStream).writeShort(value); |
| } |
| |
| @Override |
| public Short decode(InputStream inStream) throws IOException, CoderException { |
| try { |
| return new DataInputStream(inStream).readShort(); |
| } catch (EOFException | UTFDataFormatException exn) { |
| // These exceptions correspond to decoding problems, so change |
| // what kind of exception they're branded as. |
| throw new CoderException(exn); |
| } |
| } |
| |
| @Override |
| public void verifyDeterministic() {} |
| |
| /** |
| * {@inheritDoc} |
| * |
| * @return {@code true}. This coder is injective. |
| */ |
| @Override |
| public boolean consistentWithEquals() { |
| return true; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * @return {@code true}, because {@link #getEncodedElementByteSize} runs in constant time. |
| */ |
| @Override |
| public boolean isRegisterByteSizeObserverCheap(Short value) { |
| return true; |
| } |
| |
| @Override |
| public TypeDescriptor<Short> getEncodedTypeDescriptor() { |
| return TYPE_DESCRIPTOR; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * @return {@code 2}, the size in bytes of an short's big endian encoding. |
| */ |
| @Override |
| protected long getEncodedElementByteSize(Short value) throws Exception { |
| if (value == null) { |
| throw new CoderException("cannot encode a null Short"); |
| } |
| return 2; |
| } |
| } |