com.hazelcast.jet.sql.impl.aggregate.ValueSqlAggregation Maven / Gradle / Ivy
/*
* Copyright 2021 Hazelcast Inc.
*
* Licensed under the Hazelcast Community License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://hazelcast.com/hazelcast-community-license
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.hazelcast.jet.sql.impl.aggregate;
import com.hazelcast.internal.nio.IOUtil;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.spi.impl.SerializationServiceSupport;
import javax.annotation.concurrent.NotThreadSafe;
import java.io.IOException;
/**
* Special-case aggregation that aggregates multiple instances of the same
* value. The result is the value. Asserts that no non-equal value is
* accumulated.
*/
@NotThreadSafe
public class ValueSqlAggregation implements SqlAggregation {
private Object value;
@Override
public void accumulate(Object value) {
this.value = value;
}
@Override
public void combine(SqlAggregation other0) {
ValueSqlAggregation other = (ValueSqlAggregation) other0;
this.value = other.value;
}
@Override
public Object collect() {
return value;
}
@Override
public void writeData(ObjectDataOutput out) throws IOException {
IOUtil.writeData(out, ((SerializationServiceSupport) out).getSerializationService().toData(value));
}
@Override
public void readData(ObjectDataInput in) throws IOException {
value = IOUtil.readData(in);
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy