/*
* 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.Serializable;
import java.util.Collections;
import java.util.List;
/**
* An abstract base class that implements all methods of {@link Coder} except {@link Coder#encode}
* and {@link Coder#decode}.
*
* @param <T> the type of values being encoded and decoded
*/
public abstract class CustomCoder<T> extends Coder<T> implements Serializable {
/**
* {@inheritDoc}.
*
* <p>Returns an empty list. A {@link CustomCoder} has no default argument {@link Coder coders}.
*/
@Override
public List<? extends Coder<?>> getCoderArguments() {
return Collections.emptyList();
}
/**
* {@inheritDoc}
*
* @throws NonDeterministicException a {@link CustomCoder} is presumed
* nondeterministic.
*/
@Override
public void verifyDeterministic() throws NonDeterministicException {
throw new NonDeterministicException(this,
"CustomCoder implementations must override verifyDeterministic,"
+ " or they are presumed nondeterministic.");
}
// This coder inherits isRegisterByteSizeObserverCheap,
// getEncodedElementByteSize and registerByteSizeObserver
// from Coder. Override if we can do better.
}