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From twalthr <...@git.apache.org>
Subject [GitHub] flink pull request #2094: [FLINK-3702] Make FieldAccessors support nested fi...
Date Tue, 23 Aug 2016 09:11:53 GMT
Github user twalthr commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2094#discussion_r75828177
  
    --- Diff: flink-core/src/main/java/org/apache/flink/api/java/typeutils/FieldAccessor.java
---
    @@ -0,0 +1,295 @@
    +/*
    + * 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.annotation.PublicEvolving;
    +import org.apache.flink.api.common.operators.Keys;
    +import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
    +import org.apache.flink.api.common.typeinfo.TypeInformation;
    +import org.apache.flink.api.java.tuple.Tuple;
    +import org.apache.flink.api.java.typeutils.runtime.FieldSerializer;
    +
    +import java.io.IOException;
    +import java.io.ObjectInputStream;
    +import java.io.ObjectOutputStream;
    +import java.io.Serializable;
    +import java.lang.reflect.Array;
    +import java.lang.reflect.Field;
    +import java.util.regex.Matcher;
    +import java.util.regex.Pattern;
    +
    +
    +/**
    + * These classes encapsulate the logic of accessing a field specified by the user as
either an index
    + * or a field expression string. TypeInformation can also be requested for the field.
    + * The position index might specify a field of a Tuple, an array, or a simple type (only
"0th field").
    + *
    + * Field expressions that specify nested fields (e.g. "f1.a.foo") result in nested field
accessors.
    + * These penetrate one layer, and then delegate the rest of the work to an "innerAccesor".
    + * (see PojoFieldAccessor, RecursiveTupleFieldAccessor, ProductFieldAccessor)
    + */
    +@PublicEvolving
    +public abstract class FieldAccessor<T, F> implements Serializable {
    +
    +	private static final long serialVersionUID = 1L;
    +
    +	protected TypeInformation fieldType;
    +
    +	/**
    +	 * Gets the TypeInformation for the type of the field.
    +	 * Note: For an array of a primitive type, it returns the corresponding basic type (Integer
for int[]).
    +	 */
    +	@SuppressWarnings("unchecked")
    +	public TypeInformation<F> getFieldType() {
    +		return fieldType;
    +	}
    +
    +
    +	/**
    +	 * Gets the value of the field (specified in the constructor) of the given record.
    +	 * @param record
    --- End diff --
    
    My IDE shows a warning here because of missing documentation.


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