Github user StefanRRichter commented on a diff in the pull request: https://github.com/apache/flink/pull/6196#discussion_r199485075 --- Diff: flink-core/src/main/java/org/apache/flink/api/common/typeutils/CompositeSerializer.java --- @@ -0,0 +1,258 @@ +/* + * 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.common.typeutils; + +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.core.memory.DataInputView; +import org.apache.flink.core.memory.DataOutputView; +import org.apache.flink.util.Preconditions; + +import javax.annotation.Nonnull; + +import java.io.IOException; +import java.util.Arrays; +import java.util.List; +import java.util.Objects; + +/** + * Base class for composite serializers. + * + * <p>This class serializes a composite type using array of its field serializers. + * Fields are indexed the same way as their serializers. + * + * @param <T> type of custom serialized value + */ +public abstract class CompositeSerializer<T> extends TypeSerializer<T> { + private static final long serialVersionUID = 1L; + + protected final TypeSerializer<Object>[] fieldSerializers; + final boolean isImmutableTargetType; --- End diff -- I think in Java code style, a boolean field name should not be prefixed with `is...`, only the getter should be prefixed with `is...`
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