/*
* 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.List;
import org.apache.beam.sdk.values.TypeDescriptor;
/**
* A {@link CoderProvider} provides {@link Coder}s.
*
* <p>It may operate on a parameterized type, such as {@link List}, in which case the
* {@link #coderFor} method accepts a list of coders to use for the type parameters.
*/
public abstract class CoderProvider {
/**
* Returns a {@code Coder<T>} to use for values of a particular type, given the Coders for each of
* the type's generic parameter types.
*
* <p>Throws {@link CannotProvideCoderException} if this {@link CoderProvider} cannot provide
* a coder for this type and components.
*/
public abstract <T> Coder<T> coderFor(
TypeDescriptor<T> typeDescriptor, List<? extends Coder<?>> componentCoders)
throws CannotProvideCoderException;
}