org.apache.flink.formats.protobuf.serialize.PbCodegenArraySerializer 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,
* 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.protobuf.serialize;
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 PbCodegenArraySerializer implements PbCodegenSerializer {
private Descriptors.FieldDescriptor fd;
private LogicalType elementType;
public PbCodegenArraySerializer(Descriptors.FieldDescriptor fd, LogicalType elementType) {
this.fd = fd;
this.elementType = elementType;
}
@Override
public String codegen(String returnVarName, String rowFieldGetter) throws PbCodegenException {
PbCodegenVarId varUid = PbCodegenVarId.getInstance();
int uid = varUid.getAndIncrement();
PbCodegenAppender appender = new PbCodegenAppender();
String protoTypeStr = PbCodegenUtils.getTypeStrFromProto(fd, false);
String pbListVar = "pbList" + uid;
String arrayDataVar = "arrData" + uid;
String elementDataVar = "eleData" + uid;
String elementPbVar = "elementPbVar" + uid;
String iVar = "i" + uid;
appender.appendLine("ArrayData " + arrayDataVar + " = " + rowFieldGetter);
appender.appendLine("List<" + protoTypeStr + "> " + pbListVar + "= new ArrayList()");
appender.appendSegment(
"for(int "
+ iVar
+ "=0;"
+ iVar
+ " < "
+ arrayDataVar
+ ".size(); "
+ iVar
+ "++){");
String elementGenCode =
PbCodegenUtils.generateArrElementCodeWithDefaultValue(
arrayDataVar, iVar, elementPbVar, elementDataVar, fd, elementType);
appender.appendSegment(elementGenCode);
// add pb element to result list
appender.appendLine(pbListVar + ".add( " + elementPbVar + ")");
// end for
appender.appendSegment("}");
appender.appendLine(returnVarName + " = " + pbListVar);
return appender.code();
}
}