/*
* 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.util.Collections;
import java.util.List;
/**
* A {@link Coder} that has no component {@link Coder Coders} or other configuration.
*
* <p>Unless the behavior is overridden, atomic coders are presumed to be deterministic.
*
* <p>All atomic coders of the same class are considered to be equal to each other. As a result,
* an {@link AtomicCoder} should have no associated configuration (instance variables, etc).
*
* @param <T> the type of the values being transcoded
*/
public abstract class AtomicCoder<T> extends StructuredCoder<T> {
/**
* {@inheritDoc}.
*
* <p>Unless overridden, does not throw. An {@link AtomicCoder} is presumed to be deterministic
*
* @throws NonDeterministicException if overridden to indicate that this sublcass of
* {@link AtomicCoder} is not deterministic
*/
@Override
public void verifyDeterministic() throws NonDeterministicException {}
/**
* {@inheritDoc}.
*
* @return the empty list
*/
@Override
public List<? extends Coder<?>> getCoderArguments() {
return Collections.emptyList();
}
/**
* {@inheritDoc}.
*
* @return the empty {@link List}.
*/
@Override
public final List<? extends Coder<?>> getComponents() {
return Collections.emptyList();
}
/**
* {@inheritDoc}.
*
* @return true if the other object has the same class as this {@link AtomicCoder}.
*/
@Override
public final boolean equals(Object other) {
return other != null && this.getClass().equals(other.getClass());
}
/**
* {@inheritDoc}.
*
* @return the {@link #hashCode()} of the {@link Class} of this {@link AtomicCoder}.
*/
@Override
public final int hashCode() {
return this.getClass().hashCode();
}
}