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From twalthr <...@git.apache.org>
Subject [GitHub] flink pull request #5491: [FLINK-8630] [table] To support JSON schema to Typ...
Date Thu, 15 Feb 2018 14:37:24 GMT
Github user twalthr commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5491#discussion_r168493184
  
    --- Diff: flink-formats/flink-json/src/main/java/org/apache/flink/formats/json/JsonRowSerializationSchema.java
---
    @@ -0,0 +1,208 @@
    +/*
    + * 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.formats.json;
    +
    +import org.apache.flink.annotation.PublicEvolving;
    +import org.apache.flink.api.common.serialization.SerializationSchema;
    +import org.apache.flink.api.common.typeinfo.BasicArrayTypeInfo;
    +import org.apache.flink.api.common.typeinfo.PrimitiveArrayTypeInfo;
    +import org.apache.flink.api.common.typeinfo.TypeInformation;
    +import org.apache.flink.api.common.typeinfo.Types;
    +import org.apache.flink.api.java.typeutils.ObjectArrayTypeInfo;
    +import org.apache.flink.api.java.typeutils.RowTypeInfo;
    +import org.apache.flink.types.Row;
    +import org.apache.flink.util.Preconditions;
    +
    +import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.JsonNode;
    +import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.ObjectMapper;
    +import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.ArrayNode;
    +import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.ContainerNode;
    +import org.apache.flink.shaded.jackson2.com.fasterxml.jackson.databind.node.ObjectNode;
    +
    +import java.math.BigDecimal;
    +import java.math.BigInteger;
    +import java.sql.Time;
    +import java.sql.Timestamp;
    +import java.text.SimpleDateFormat;
    +
    +/**
    + * Serialization schema that serializes an object of Flink types into a JSON bytes.
    + *
    + * <p>Serializes the input Flink object into a JSON string and
    + * converts it into <code>byte[]</code>.
    + *
    + * <p>Result <code>byte[]</code> messages can be deserialized using
{@link JsonRowDeserializationSchema}.
    + */
    +@PublicEvolving
    +public class JsonRowSerializationSchema implements SerializationSchema<Row> {
    +
    +	private static final long serialVersionUID = -2885556750743978636L;
    +
    +	/** Type information describing the input type. */
    +	private final TypeInformation<Row> typeInfo;
    +
    +	/** Object mapper that is used to create output JSON objects. */
    +	private final ObjectMapper mapper = new ObjectMapper();
    +
    +	/** Formatter for RFC 3339-compliant string representation of a time value (with UTC
timezone, without milliseconds). */
    +	private SimpleDateFormat timeFormat = new SimpleDateFormat("HH:mm:ss'Z'");
    +
    +	/** Formatter for RFC 3339-compliant string representation of a time value (with UTC
timezone). */
    +	private SimpleDateFormat timeFormatWithMillis = new SimpleDateFormat("HH:mm:ss.SSS'Z'");
    +
    +	/** Formatter for RFC 3339-compliant string representation of a timestamp value (with
UTC timezone). */
    +	private SimpleDateFormat timestampFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
    +
    +	/** Reusable object node. */
    +	private transient ObjectNode node;
    +
    +	/**
    +	 * Creates a JSON serialization schema for the given type information.
    +	 *
    +	 * @param typeInfo The field names of {@link Row} are used to map to JSON properties.
    +	 */
    +	public JsonRowSerializationSchema(TypeInformation<Row> typeInfo) {
    +		Preconditions.checkNotNull(typeInfo, "Type information");
    +		this.typeInfo = typeInfo;
    +	}
    +
    +	/**
    +	 * Creates a JSON serialization schema for the given JSON schema.
    +	 *
    +	 * @param jsonSchema JSON schema describing the result type
    +	 *
    +	 * @see <a href="http://json-schema.org/">http://json-schema.org/</a>
    +	 */
    +	public JsonRowSerializationSchema(String jsonSchema) {
    +		this(JsonSchemaConverter.convert(jsonSchema));
    +	}
    +
    +	@Override
    +	public byte[] serialize(Row row) {
    --- End diff --
    
    The framework takes care of duplicating the class.


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