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JsonFormatFactory.java
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JsonFormatFactory.java
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/*
* 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.Internal;
import org.apache.flink.api.common.serialization.DeserializationSchema;
import org.apache.flink.api.common.serialization.SerializationSchema;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.configuration.ConfigOption;
import org.apache.flink.configuration.ReadableConfig;
import org.apache.flink.formats.common.TimestampFormat;
import org.apache.flink.table.connector.ChangelogMode;
import org.apache.flink.table.connector.Projection;
import org.apache.flink.table.connector.format.DecodingFormat;
import org.apache.flink.table.connector.format.EncodingFormat;
import org.apache.flink.table.connector.format.ProjectableDecodingFormat;
import org.apache.flink.table.connector.sink.DynamicTableSink;
import org.apache.flink.table.connector.source.DynamicTableSource;
import org.apache.flink.table.data.RowData;
import org.apache.flink.table.factories.DeserializationFormatFactory;
import org.apache.flink.table.factories.DynamicTableFactory;
import org.apache.flink.table.factories.FactoryUtil;
import org.apache.flink.table.factories.SerializationFormatFactory;
import org.apache.flink.table.types.DataType;
import org.apache.flink.table.types.logical.RowType;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import static org.apache.flink.formats.json.JsonFormatOptions.DECODE_JSON_PARSER_ENABLED;
import static org.apache.flink.formats.json.JsonFormatOptions.ENCODE_DECIMAL_AS_PLAIN_NUMBER;
import static org.apache.flink.formats.json.JsonFormatOptions.ENCODE_IGNORE_NULL_FIELDS;
import static org.apache.flink.formats.json.JsonFormatOptions.FAIL_ON_MISSING_FIELD;
import static org.apache.flink.formats.json.JsonFormatOptions.IGNORE_PARSE_ERRORS;
import static org.apache.flink.formats.json.JsonFormatOptions.MAP_NULL_KEY_LITERAL;
import static org.apache.flink.formats.json.JsonFormatOptions.MAP_NULL_KEY_MODE;
import static org.apache.flink.formats.json.JsonFormatOptions.TIMESTAMP_FORMAT;
/**
* Table format factory for providing configured instances of JSON to RowData {@link
* SerializationSchema} and {@link DeserializationSchema}.
*/
@Internal
public class JsonFormatFactory implements DeserializationFormatFactory, SerializationFormatFactory {
public static final String IDENTIFIER = "json";
@Override
public DecodingFormat<DeserializationSchema<RowData>> createDecodingFormat(
DynamicTableFactory.Context context, ReadableConfig formatOptions) {
FactoryUtil.validateFactoryOptions(this, formatOptions);
JsonFormatOptionsUtil.validateDecodingFormatOptions(formatOptions);
final boolean failOnMissingField = formatOptions.get(FAIL_ON_MISSING_FIELD);
final boolean ignoreParseErrors = formatOptions.get(IGNORE_PARSE_ERRORS);
final boolean jsonParserEnabled = formatOptions.get(DECODE_JSON_PARSER_ENABLED);
TimestampFormat timestampOption = JsonFormatOptionsUtil.getTimestampFormat(formatOptions);
return new ProjectableDecodingFormat<DeserializationSchema<RowData>>() {
@Override
public DeserializationSchema<RowData> createRuntimeDecoder(
DynamicTableSource.Context context,
DataType physicalDataType,
int[][] projections) {
final DataType producedDataType =
Projection.of(projections).project(physicalDataType);
final RowType rowType = (RowType) producedDataType.getLogicalType();
final TypeInformation<RowData> rowDataTypeInfo =
context.createTypeInformation(producedDataType);
if (jsonParserEnabled) {
return new JsonParserRowDataDeserializationSchema(
rowType,
rowDataTypeInfo,
failOnMissingField,
ignoreParseErrors,
timestampOption,
toProjectedNames(
(RowType) physicalDataType.getLogicalType(), projections));
} else {
return new JsonRowDataDeserializationSchema(
rowType,
rowDataTypeInfo,
failOnMissingField,
ignoreParseErrors,
timestampOption);
}
}
@Override
public ChangelogMode getChangelogMode() {
return ChangelogMode.insertOnly();
}
@Override
public boolean supportsNestedProjection() {
return jsonParserEnabled;
}
};
}
private String[][] toProjectedNames(RowType type, int[][] projectedFields) {
String[][] projectedNames = new String[projectedFields.length][];
for (int i = 0; i < projectedNames.length; i++) {
int[] fieldIndices = projectedFields[i];
String[] fieldNames = new String[fieldIndices.length];
projectedNames[i] = fieldNames;
// convert fieldIndices to fieldNames
RowType currentType = type;
for (int j = 0; j < fieldIndices.length; j++) {
int index = fieldIndices[j];
fieldNames[j] = currentType.getFieldNames().get(index);
if (j != fieldIndices.length - 1) {
currentType = (RowType) currentType.getTypeAt(index);
}
}
}
return projectedNames;
}
@Override
public EncodingFormat<SerializationSchema<RowData>> createEncodingFormat(
DynamicTableFactory.Context context, ReadableConfig formatOptions) {
FactoryUtil.validateFactoryOptions(this, formatOptions);
JsonFormatOptionsUtil.validateEncodingFormatOptions(formatOptions);
TimestampFormat timestampOption = JsonFormatOptionsUtil.getTimestampFormat(formatOptions);
JsonFormatOptions.MapNullKeyMode mapNullKeyMode =
JsonFormatOptionsUtil.getMapNullKeyMode(formatOptions);
String mapNullKeyLiteral = formatOptions.get(MAP_NULL_KEY_LITERAL);
final boolean encodeDecimalAsPlainNumber =
formatOptions.get(ENCODE_DECIMAL_AS_PLAIN_NUMBER);
final boolean ignoreNullFields = formatOptions.get(ENCODE_IGNORE_NULL_FIELDS);
return new EncodingFormat<SerializationSchema<RowData>>() {
@Override
public SerializationSchema<RowData> createRuntimeEncoder(
DynamicTableSink.Context context, DataType consumedDataType) {
final RowType rowType = (RowType) consumedDataType.getLogicalType();
return new JsonRowDataSerializationSchema(
rowType,
timestampOption,
mapNullKeyMode,
mapNullKeyLiteral,
encodeDecimalAsPlainNumber,
ignoreNullFields);
}
@Override
public ChangelogMode getChangelogMode() {
return ChangelogMode.insertOnly();
}
};
}
@Override
public String factoryIdentifier() {
return IDENTIFIER;
}
@Override
public Set<ConfigOption<?>> requiredOptions() {
return Collections.emptySet();
}
@Override
public Set<ConfigOption<?>> optionalOptions() {
Set<ConfigOption<?>> options = new HashSet<>();
options.add(FAIL_ON_MISSING_FIELD);
options.add(IGNORE_PARSE_ERRORS);
options.add(TIMESTAMP_FORMAT);
options.add(MAP_NULL_KEY_MODE);
options.add(MAP_NULL_KEY_LITERAL);
options.add(ENCODE_DECIMAL_AS_PLAIN_NUMBER);
options.add(ENCODE_IGNORE_NULL_FIELDS);
return options;
}
@Override
public Set<ConfigOption<?>> forwardOptions() {
Set<ConfigOption<?>> options = new HashSet<>();
options.add(TIMESTAMP_FORMAT);
options.add(MAP_NULL_KEY_MODE);
options.add(MAP_NULL_KEY_LITERAL);
options.add(ENCODE_DECIMAL_AS_PLAIN_NUMBER);
options.add(ENCODE_IGNORE_NULL_FIELDS);
return options;
}
}