/*
* 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.flink.api.java.typeutils;
import org.apache.flink.api.common.functions.InvalidTypesException;
import org.apache.flink.api.common.typeinfo.TypeInfoFactory;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.types.Either;
import java.lang.reflect.Type;
import java.util.Map;
public class EitherTypeInfoFactory<L, R> extends TypeInfoFactory<Either<L, R>> {
@Override
public TypeInformation<Either<L, R>> createTypeInfo(Type t, Map<String, TypeInformation<?>> genericParameters) {
TypeInformation<?> leftType = genericParameters.get("L");
TypeInformation<?> rightType = genericParameters.get("R");
if (leftType == null) {
throw new InvalidTypesException("Type extraction is not possible on Either" +
" type as it does not contain information about the 'left' type.");
}
if (rightType == null) {
throw new InvalidTypesException("Type extraction is not possible on Either" +
" type as it does not contain information about the 'right' type.");
}
return new EitherTypeInfo(leftType, rightType);
}
}