what to write here

what to write here

https://github.com/apache/incubator-wayang/blob/3a461b516bda004c2fa7d6d4392ed0ee23da96cf/wayang-platforms/wayang-java/src/main/java/org/apache/wayang/java/operators/JavaGoogleCloudStorageSource.java#L77

```java

/*
* 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.wayang.java.operators;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.stream.Stream;

import org.apache.wayang.basic.operators.AmazonS3Source;
import org.apache.wayang.basic.operators.GoogleCloudStorageSource;
import org.apache.wayang.core.api.exception.WayangException;
import org.apache.wayang.core.optimizer.OptimizationContext;
import org.apache.wayang.core.optimizer.OptimizationContext.OperatorContext;
import org.apache.wayang.core.optimizer.costs.LoadProfileEstimators;
import org.apache.wayang.core.platform.ChannelDescriptor;
import org.apache.wayang.core.platform.ChannelInstance;
import org.apache.wayang.core.platform.lineage.ExecutionLineageNode;
import org.apache.wayang.core.util.Tuple;
import org.apache.wayang.java.channels.StreamChannel;
import org.apache.wayang.java.execution.JavaExecutor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class JavaGoogleCloudStorageSource extends GoogleCloudStorageSource implements JavaExecutionOperator {
private static final Logger logger = LoggerFactory.getLogger(JavaGoogleCloudStorageSource.class);

public JavaGoogleCloudStorageSource(String bucket, String blobName, String filePathToCredentialsFile) {
super(bucket, blobName, filePathToCredentialsFile);
}

public JavaGoogleCloudStorageSource(GoogleCloudStorageSource that) {
super(that);
}

@Override
public Tuple, Collection> evaluate(ChannelInstance[] inputs,
ChannelInstance[] outputs, JavaExecutor javaExecutor, OperatorContext operatorContext) {
assert inputs.length == this.getNumInputs();
assert outputs.length == this.getNumOutputs();

try {

BufferedReader buffereadReder = new BufferedReader(new InputStreamReader(super.getInputStream()));
Stream lines = buffereadReder.lines();
((StreamChannel.Instance) outputs[0]).accept(lines);
}
catch (Exception e) {
throw new WayangException("Failed to read file from Google CLoud storage with error", e);
}

//TODO what to write here
ExecutionLineageNode prepareLineageNode = new ExecutionLineageNode(operatorContext);
prepareLineageNode.add(LoadProfileEstimators.createFromSpecification(
//TODO what to write here

"wayang.java.googlecloudstoragesource.load.prepare", javaExecutor.getConfiguration()
));
ExecutionLineageNode mainLineageNode = new ExecutionLineageNode(operatorContext);
mainLineageNode.add(LoadProfileEstimators.createFromSpecification(
//TODO what to write here

"wayang.java.googlecloudstoragesource.load.main", javaExecutor.getConfiguration()
));

outputs[0].getLineage().addPredecessor(mainLineageNode);

return prepareLineageNode.collectAndMark();
}

@Override
public Collection getLoadProfileEstimatorConfigurationKeys() {
return Arrays.asList("wayang.java.googlecloudstoragesource.load.prepare", "wayang.java.googlecloudstoragesource.load.main");
}

@Override
public JavaGoogleCloudStorageSource copy() {
return new JavaGoogleCloudStorageSource(this.getBucket(), this.getBlobName(), this.getfilePathToCredentialsFile());
}

@Override
public List getSupportedInputChannels(int index) {
throw new UnsupportedOperationException(String.format("%s does not have input channels.", this));
}

@Override
public List getSupportedOutputChannels(int index) {
assert index <= this.getNumOutputs() || (index == 0 && this.getNumOutputs() == 0);
return Collections.singletonList(StreamChannel.DESCRIPTOR);
}

}

```

f740d8a227d5cab0353230614cf0accb3c94c5cf

Start with wayang-platforms/wayang-java/src/main/java/org/apache/wayang/java/operators/JavaGoogleCloudStorageSource.java, focusing on evaluate and its two load-profile TODOs. Compare related Java source operators to determine the intended lineage and estimator configuration, then verify that both TODOs are resolved and the operator’s output lineage remains correct.

Written by the indexing model from the issue text.