/*
* Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
* license agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership. Crate 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial agreement.
*/
package io.crate.planner.projection;
import io.crate.analyze.symbol.AggregateMode;
import io.crate.analyze.symbol.Aggregation;
import io.crate.analyze.symbol.Symbol;
import io.crate.analyze.symbol.Symbols;
import io.crate.collections.Lists2;
import io.crate.metadata.RowGranularity;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Function;
public class GroupProjection extends Projection {
private List<Symbol> keys;
private List<Aggregation> values;
private List<Symbol> outputs;
private AggregateMode mode;
private RowGranularity requiredGranularity = RowGranularity.CLUSTER;
public GroupProjection(List<Symbol> keys,
List<Aggregation> values,
AggregateMode mode,
RowGranularity requiredGranularity) {
this.keys = keys;
this.values = values;
this.mode = mode;
this.requiredGranularity = requiredGranularity;
}
public GroupProjection(StreamInput in) throws IOException {
mode = AggregateMode.readFrom(in);
keys = Symbols.listFromStream(in);
int size = in.readVInt();
values = new ArrayList<>(size);
for (int i = 0; i < size; i++) {
values.add((Aggregation) Symbols.fromStream(in));
}
requiredGranularity = RowGranularity.fromStream(in);
}
@Override
public void replaceSymbols(Function<Symbol, Symbol> replaceFunction) {
Lists2.replaceItems(keys, replaceFunction);
Lists2.replaceItems(outputs, replaceFunction);
}
public List<Symbol> keys() {
return keys;
}
public List<Aggregation> values() {
return values;
}
@Override
public ProjectionType projectionType() {
return ProjectionType.GROUP;
}
@Override
public <C, R> R accept(ProjectionVisitor<C, R> visitor, C context) {
return visitor.visitGroupProjection(this, context);
}
/**
* returns a list of outputs, with the group by keys going first,
* and the aggregations coming last
*/
@Override
public List<? extends Symbol> outputs() {
if (outputs == null) {
outputs = new ArrayList<>(keys.size() + values.size());
outputs.addAll(keys);
outputs.addAll(values);
}
return outputs;
}
@Override
public void writeTo(StreamOutput out) throws IOException {
AggregateMode.writeTo(mode, out);
Symbols.toStream(keys, out);
Symbols.toStream(values, out);
RowGranularity.toStream(requiredGranularity, out);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
GroupProjection that = (GroupProjection) o;
if (!keys.equals(that.keys)) return false;
if (values != null ? !values.equals(that.values) : that.values != null) return false;
return true;
}
@Override
public RowGranularity requiredGranularity() {
return requiredGranularity;
}
public AggregateMode mode() {
return mode;
}
}