com.hazelcast.jet.sql.impl.aggregate.OrderedJsonArrayAggAggregation 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.core.HazelcastJsonValue;
import com.hazelcast.jet.sql.impl.ExpressionUtil;
import com.hazelcast.jet.sql.impl.expression.json.JsonCreationUtil;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.sql.impl.row.JetSqlRow;
import javax.annotation.concurrent.NotThreadSafe;
import java.util.PriorityQueue;
@NotThreadSafe
public final class OrderedJsonArrayAggAggregation implements SqlAggregation {
private final PriorityQueue objects;
private final boolean isAbsentOnNull;
private final int aggIndex;
private OrderedJsonArrayAggAggregation(ExpressionUtil.SqlRowComparator comparator, boolean isAbsentOnNull, int aggIndex) {
this.isAbsentOnNull = isAbsentOnNull;
this.aggIndex = aggIndex;
this.objects = new PriorityQueue<>(comparator);
}
public static OrderedJsonArrayAggAggregation create(
ExpressionUtil.SqlRowComparator comparator,
boolean isAbsentOnNull,
int aggIndex
) {
return new OrderedJsonArrayAggAggregation(comparator, isAbsentOnNull, aggIndex);
}
@Override
public void accumulate(Object value) {
JetSqlRow row = (JetSqlRow) value;
objects.add(row);
}
@Override
public void combine(SqlAggregation other) {
throw new UnsupportedOperationException("OrderedJsonArrayAgg combine() method should not be called");
}
@Override
public Object collect() {
StringBuilder sb = new StringBuilder();
boolean firstValue = true;
sb.append("[");
while (!objects.isEmpty()) {
JetSqlRow row = objects.poll();
Object value = row.get(aggIndex);
if (value == null) {
if (!isAbsentOnNull) {
if (!firstValue) {
sb.append(",");
}
sb.append("null");
firstValue = false;
}
} else {
if (!firstValue) {
sb.append(",");
}
sb.append(JsonCreationUtil.serializeValue(value));
firstValue = false;
}
}
sb.append("]");
if (firstValue) {
return null;
} else {
return new HazelcastJsonValue(sb.toString());
}
}
@Override
public void writeData(ObjectDataOutput out) {
throw new UnsupportedOperationException("OrderedJsonArrayAgg writeData() method should not be called");
}
@Override
public void readData(ObjectDataInput in) {
throw new UnsupportedOperationException("OrderedJsonArrayAgg readData() should not be called");
}
}
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