org.apache.flink.formats.protobuf.deserialize.PbCodegenArrayDeserializer Maven / Gradle / Ivy
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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,
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package org.apache.flink.formats.protobuf.deserialize;
import org.apache.flink.formats.protobuf.PbCodegenAppender;
import org.apache.flink.formats.protobuf.PbCodegenException;
import org.apache.flink.formats.protobuf.PbCodegenUtils;
import org.apache.flink.formats.protobuf.PbCodegenVarId;
import org.apache.flink.table.types.logical.LogicalType;
import com.google.protobuf.Descriptors;
public class PbCodegenArrayDeserializer implements PbCodegenDeserializer {
private Descriptors.FieldDescriptor fd;
private LogicalType elementType;
private boolean readDefaultValues;
private PbCodegenAppender appender = new PbCodegenAppender();
public PbCodegenArrayDeserializer(
Descriptors.FieldDescriptor fd, LogicalType elementType, boolean readDefaultValues) {
this.fd = fd;
this.elementType = elementType;
this.readDefaultValues = readDefaultValues;
}
@Override
public String codegen(String returnVarName, String messageGetStr) throws PbCodegenException {
// The type of messageGetStr is a native List object,
// it should be converted to ArrayData of flink internal type
PbCodegenVarId varUid = PbCodegenVarId.getInstance();
int uid = varUid.getAndIncrement();
String protoTypeStr = PbCodegenUtils.getTypeStrFromProto(fd, false);
String listPbVar = "list" + uid;
String newArrDataVar = "newArr" + uid;
String subReturnDataVar = "subReturnVar" + uid;
String iVar = "i" + uid;
String subPbObjVar = "subObj" + uid;
appender.appendLine("List<" + protoTypeStr + "> " + listPbVar + "=" + messageGetStr);
appender.appendLine(
"Object[] " + newArrDataVar + "= new " + "Object[" + listPbVar + ".size()]");
appender.appendSegment(
"for(int " + iVar + "=0;" + iVar + " < " + listPbVar + ".size(); " + iVar + "++){");
appender.appendLine("Object " + subReturnDataVar + " = null");
appender.appendLine(
protoTypeStr
+ " "
+ subPbObjVar
+ " = ("
+ protoTypeStr
+ ")"
+ listPbVar
+ ".get("
+ iVar
+ ")");
PbCodegenDeserializer codegenDes =
PbCodegenDeserializeFactory.getPbCodegenDes(fd, elementType, readDefaultValues);
String code = codegenDes.codegen(subReturnDataVar, subPbObjVar);
appender.appendSegment(code);
appender.appendLine(newArrDataVar + "[" + iVar + "]=" + subReturnDataVar + "");
appender.appendSegment("}");
appender.appendLine(returnVarName + " = new GenericArrayData(" + newArrDataVar + ")");
return appender.code();
}
}