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ToRow.java
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ToRow.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.beam.sdk.nexmark.model.sql;
import java.util.Map;
import org.apache.beam.sdk.nexmark.model.Event;
import org.apache.beam.sdk.nexmark.model.KnownSize;
import org.apache.beam.sdk.nexmark.model.sql.adapter.ModelAdaptersMapping;
import org.apache.beam.sdk.nexmark.model.sql.adapter.ModelFieldsAdapter;
import org.apache.beam.sdk.transforms.DoFn;
import org.apache.beam.sdk.transforms.ParDo;
import org.apache.beam.sdk.values.Row;
/**
* Convert Java model object to Row.
*/
public class ToRow {
static final ToRow INSTANCE = new ToRow(ModelAdaptersMapping.ADAPTERS);
private Map<Class, ModelFieldsAdapter> modelTypeAdapters;
private ToRow(Map<Class, ModelFieldsAdapter> modelTypeAdapters) {
this.modelTypeAdapters = modelTypeAdapters;
}
private Row toRow(Event event) {
if (event == null) {
return null;
}
KnownSize model = getModel(event);
Class modelClass = model.getClass();
if (!modelTypeAdapters.containsKey(modelClass)) {
throw new IllegalArgumentException(
"Beam SQL record type adapter is not registered for " + model.getClass().getSimpleName());
}
ModelFieldsAdapter adapter = modelTypeAdapters.get(modelClass);
return Row
.withRowType(adapter.getRowType())
.addValues(adapter.getFieldsValues(model))
.build();
}
private KnownSize getModel(Event event) {
if (event.newAuction != null) {
return event.newAuction;
} else if (event.newPerson != null) {
return event.newPerson;
} else if (event.bid != null) {
return event.bid;
}
throw new IllegalStateException("Unsupported event type " + event);
}
public static ParDo.SingleOutput<Event, Row> parDo() {
return ParDo.of(new DoFn<Event, Row>() {
@ProcessElement
public void processElement(ProcessContext c) {
Row row = INSTANCE.toRow(c.element());
c.output(row);
}
});
}
}