/*
* Copyright (c) 2015 Spotify AB.
*
* 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 com.spotify.heroic.aggregation;
import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.common.collect.ImmutableMap;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
public class CollapseInstance extends GroupingAggregation {
public static final Map<String, String> NO_GROUP = ImmutableMap.of();
@JsonCreator
public CollapseInstance(
@JsonProperty("of") Optional<List<String>> of,
@JsonProperty("each") AggregationInstance each
) {
super(of, each);
}
@Override
protected Map<String, String> key(final Map<String, String> tags) {
return getOf().map(of -> {
// group by 'everything'
if (of.isEmpty()) {
return tags;
}
final Map<String, String> key = new HashMap<>(tags);
for (final String o : of) {
key.remove(o);
}
return key;
}).orElse(NO_GROUP);
}
@Override
protected AggregationInstance newInstance(
final Optional<List<String>> of, final AggregationInstance each
) {
return new CollapseInstance(of, each);
}
}