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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.search.aggregations.bucket.composite;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.Version;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.search.DocValueFormat;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.InternalAggregation;
import org.elasticsearch.search.aggregations.InternalAggregations;
import org.elasticsearch.search.aggregations.InternalMultiBucketAggregation;
import org.elasticsearch.search.aggregations.KeyComparable;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import java.io.IOException;
import java.util.AbstractMap;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.PriorityQueue;
import java.util.Set;
public class InternalComposite
extends InternalMultiBucketAggregation implements CompositeAggregation {
private final int size;
private final List buckets;
private final CompositeKey afterKey;
private final int[] reverseMuls;
private final List sourceNames;
private final List formats;
private final boolean earlyTerminated;
InternalComposite(String name, int size, List sourceNames, List formats,
List buckets, CompositeKey afterKey, int[] reverseMuls, boolean earlyTerminated,
List pipelineAggregators, Map metaData) {
super(name, pipelineAggregators, metaData);
this.sourceNames = sourceNames;
this.formats = formats;
this.buckets = buckets;
this.afterKey = afterKey;
this.size = size;
this.reverseMuls = reverseMuls;
this.earlyTerminated = earlyTerminated;
}
public InternalComposite(StreamInput in) throws IOException {
super(in);
this.size = in.readVInt();
this.sourceNames = in.readStringList();
this.formats = new ArrayList<>(sourceNames.size());
for (int i = 0; i < sourceNames.size(); i++) {
if (in.getVersion().onOrAfter(Version.V_6_3_0)) {
formats.add(in.readNamedWriteable(DocValueFormat.class));
} else {
formats.add(DocValueFormat.RAW);
}
}
this.reverseMuls = in.readIntArray();
this.buckets = in.readList((input) -> new InternalBucket(input, sourceNames, formats, reverseMuls));
if (in.getVersion().onOrAfter(Version.V_6_3_0)) {
this.afterKey = in.readBoolean() ? new CompositeKey(in) : null;
} else {
this.afterKey = buckets.size() > 0 ? buckets.get(buckets.size()-1).key : null;
}
this.earlyTerminated = in.getVersion().onOrAfter(Version.V_7_6_0) ? in.readBoolean() : false;
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeVInt(size);
out.writeStringCollection(sourceNames);
if (out.getVersion().onOrAfter(Version.V_6_3_0)) {
for (DocValueFormat format : formats) {
out.writeNamedWriteable(format);
}
}
out.writeIntArray(reverseMuls);
out.writeList(buckets);
if (out.getVersion().onOrAfter(Version.V_6_3_0)) {
out.writeBoolean(afterKey != null);
if (afterKey != null) {
afterKey.writeTo(out);
}
}
if (out.getVersion().onOrAfter(Version.V_7_6_0)) {
out.writeBoolean(earlyTerminated);
}
}
@Override
public XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
return CompositeAggregation.toXContentFragment(this, builder, params);
}
@Override
public String getWriteableName() {
return CompositeAggregationBuilder.NAME;
}
@Override
public InternalComposite create(List newBuckets) {
/**
* This is used by pipeline aggregations to filter/remove buckets so we
* keep the afterKey of the original aggregation in order
* to be able to retrieve the next page even if all buckets have been filtered.
*/
return new InternalComposite(name, size, sourceNames, formats, newBuckets, afterKey,
reverseMuls, earlyTerminated, pipelineAggregators(), getMetaData());
}
@Override
public InternalBucket createBucket(InternalAggregations aggregations, InternalBucket prototype) {
return new InternalBucket(prototype.sourceNames, prototype.formats, prototype.key, prototype.reverseMuls,
prototype.docCount, aggregations);
}
public int getSize() {
return size;
}
@Override
public List getBuckets() {
return buckets;
}
/**
* The formats used when writing the keys. Package private for testing.
*/
List getFormats() {
return formats;
}
@Override
public Map afterKey() {
if (afterKey != null) {
return new ArrayMap(sourceNames, formats, afterKey.values());
}
return null;
}
// Visible for tests
boolean isTerminatedEarly() {
return earlyTerminated;
}
// Visible for tests
int[] getReverseMuls() {
return reverseMuls;
}
@Override
public InternalAggregation reduce(List aggregations, ReduceContext reduceContext) {
PriorityQueue pq = new PriorityQueue<>(aggregations.size());
boolean earlyTerminated = false;
for (InternalAggregation agg : aggregations) {
InternalComposite sortedAgg = (InternalComposite) agg;
earlyTerminated |= sortedAgg.earlyTerminated;
BucketIterator it = new BucketIterator(sortedAgg.buckets);
if (it.next() != null) {
pq.add(it);
}
}
InternalBucket lastBucket = null;
List buckets = new ArrayList<>();
List result = new ArrayList<>();
while (pq.size() > 0) {
BucketIterator bucketIt = pq.poll();
if (lastBucket != null && bucketIt.current.compareKey(lastBucket) != 0) {
InternalBucket reduceBucket = reduceBucket(buckets, reduceContext);
buckets.clear();
reduceContext.consumeBucketsAndMaybeBreak(1);
result.add(reduceBucket);
if (result.size() >= size) {
break;
}
}
lastBucket = bucketIt.current;
buckets.add(bucketIt.current);
if (bucketIt.next() != null) {
pq.add(bucketIt);
}
}
if (buckets.size() > 0) {
InternalBucket reduceBucket = reduceBucket(buckets, reduceContext);
reduceContext.consumeBucketsAndMaybeBreak(1);
result.add(reduceBucket);
}
List reducedFormats = formats;
CompositeKey lastKey = null;
if (result.size() > 0) {
lastBucket = result.get(result.size() - 1);
/* Attach the formats from the last bucket to the reduced composite
* so that we can properly format the after key. */
reducedFormats = lastBucket.formats;
lastKey = lastBucket.getRawKey();
}
return new InternalComposite(name, size, sourceNames, reducedFormats, result, lastKey, reverseMuls,
earlyTerminated, pipelineAggregators(), metaData);
}
@Override
protected InternalBucket reduceBucket(List buckets, ReduceContext context) {
assert buckets.size() > 0;
List aggregations = new ArrayList<>(buckets.size());
long docCount = 0;
for (InternalBucket bucket : buckets) {
docCount += bucket.docCount;
aggregations.add(bucket.aggregations);
}
InternalAggregations aggs = InternalAggregations.reduce(aggregations, context);
/* Use the formats from the bucket because they'll be right to format
* the key. The formats on the InternalComposite doing the reducing are
* just whatever formats make sense for *its* index. This can be real
* trouble when the index doing the reducing is unmapped. */
List reducedFormats = buckets.get(0).formats;
return new InternalBucket(sourceNames, reducedFormats, buckets.get(0).key, reverseMuls, docCount, aggs);
}
@Override
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj == null || getClass() != obj.getClass()) return false;
if (super.equals(obj) == false) return false;
InternalComposite that = (InternalComposite) obj;
return Objects.equals(size, that.size) &&
Objects.equals(buckets, that.buckets) &&
Objects.equals(afterKey, that.afterKey) &&
Arrays.equals(reverseMuls, that.reverseMuls);
}
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), size, buckets, afterKey, Arrays.hashCode(reverseMuls));
}
private static class BucketIterator implements Comparable {
final Iterator it;
InternalBucket current;
private BucketIterator(List buckets) {
this.it = buckets.iterator();
}
@Override
public int compareTo(BucketIterator other) {
return current.compareKey(other.current);
}
InternalBucket next() {
return current = it.hasNext() ? it.next() : null;
}
}
public static class InternalBucket extends InternalMultiBucketAggregation.InternalBucket
implements CompositeAggregation.Bucket, KeyComparable {
private final CompositeKey key;
private final long docCount;
private final InternalAggregations aggregations;
private final transient int[] reverseMuls;
private final transient List sourceNames;
private final transient List formats;
InternalBucket(List sourceNames, List formats, CompositeKey key, int[] reverseMuls, long docCount,
InternalAggregations aggregations) {
this.key = key;
this.docCount = docCount;
this.aggregations = aggregations;
this.reverseMuls = reverseMuls;
this.sourceNames = sourceNames;
this.formats = formats;
}
InternalBucket(StreamInput in, List sourceNames, List formats, int[] reverseMuls) throws IOException {
this.key = new CompositeKey(in);
this.docCount = in.readVLong();
this.aggregations = new InternalAggregations(in);
this.reverseMuls = reverseMuls;
this.sourceNames = sourceNames;
this.formats = formats;
}
@Override
public void writeTo(StreamOutput out) throws IOException {
key.writeTo(out);
out.writeVLong(docCount);
aggregations.writeTo(out);
}
@Override
public int hashCode() {
return Objects.hash(getClass(), docCount, key, aggregations);
}
@Override
public boolean equals(Object obj) {
if (obj == null || getClass() != obj.getClass()) {
return false;
}
InternalBucket that = (InternalBucket) obj;
return Objects.equals(docCount, that.docCount)
&& Objects.equals(key, that.key)
&& Objects.equals(aggregations, that.aggregations);
}
@Override
public Map getKey() {
// returns the formatted key in a map
return new ArrayMap(sourceNames, formats, key.values());
}
// get the raw key (without formatting to preserve the natural order).
// visible for testing
CompositeKey getRawKey() {
return key;
}
@Override
public String getKeyAsString() {
StringBuilder builder = new StringBuilder();
builder.append('{');
for (int i = 0; i < key.size(); i++) {
if (i > 0) {
builder.append(", ");
}
builder.append(sourceNames.get(i));
builder.append('=');
builder.append(formatObject(key.get(i), formats.get(i)));
}
builder.append('}');
return builder.toString();
}
@Override
public long getDocCount() {
return docCount;
}
@Override
public Aggregations getAggregations() {
return aggregations;
}
/**
* The formats used when writing the keys. Package private for testing.
*/
List getFormats() {
return formats;
}
@Override
public int compareKey(InternalBucket other) {
for (int i = 0; i < key.size(); i++) {
if (key.get(i) == null) {
if (other.key.get(i) == null) {
continue;
}
return -1 * reverseMuls[i];
} else if (other.key.get(i) == null) {
return reverseMuls[i];
}
assert key.get(i).getClass() == other.key.get(i).getClass();
@SuppressWarnings("unchecked")
int cmp = key.get(i).compareTo(other.key.get(i)) * reverseMuls[i];
if (cmp != 0) {
return cmp;
}
}
return 0;
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
/**
* See {@link CompositeAggregation#bucketToXContent}
*/
throw new UnsupportedOperationException("not implemented");
}
}
/**
* Format obj using the provided {@link DocValueFormat}.
* If the format is equals to {@link DocValueFormat#RAW}, the object is returned as is
* for numbers and a string for {@link BytesRef}s.
*/
static Object formatObject(Object obj, DocValueFormat format) {
if (obj == null) {
return null;
}
if (obj.getClass() == BytesRef.class) {
BytesRef value = (BytesRef) obj;
if (format == DocValueFormat.RAW) {
return value.utf8ToString();
} else {
return format.format(value);
}
} else if (obj.getClass() == Long.class) {
long value = (long) obj;
if (format == DocValueFormat.RAW) {
return value;
} else {
return format.format(value);
}
} else if (obj.getClass() == Double.class) {
double value = (double) obj;
if (format == DocValueFormat.RAW) {
return value;
} else {
return format.format(value);
}
}
return obj;
}
static class ArrayMap extends AbstractMap implements Comparable {
final List keys;
final Comparable[] values;
final List formats;
ArrayMap(List keys, List formats, Comparable[] values) {
assert keys.size() == values.length && keys.size() == formats.size();
this.keys = keys;
this.formats = formats;
this.values = values;
}
@Override
public int size() {
return values.length;
}
@Override
public Object get(Object key) {
for (int i = 0; i < keys.size(); i++) {
if (key.equals(keys.get(i))) {
return formatObject(values[i], formats.get(i));
}
}
return null;
}
@Override
public Set> entrySet() {
return new AbstractSet>() {
@Override
public Iterator> iterator() {
return new Iterator>() {
int pos = 0;
@Override
public boolean hasNext() {
return pos < values.length;
}
@Override
public Entry next() {
SimpleEntry entry =
new SimpleEntry<>(keys.get(pos), formatObject(values[pos], formats.get(pos)));
++ pos;
return entry;
}
};
}
@Override
public int size() {
return keys.size();
}
};
}
@Override
public int compareTo(ArrayMap that) {
if (that == this) {
return 0;
}
int idx = 0;
int max = Math.min(this.keys.size(), that.keys.size());
while (idx < max) {
int compare = compareNullables(keys.get(idx), that.keys.get(idx));
if (compare == 0) {
compare = compareNullables(values[idx], that.values[idx]);
}
if (compare != 0) {
return compare;
}
idx++;
}
if (idx < keys.size()) {
return 1;
}
if (idx < that.keys.size()) {
return -1;
}
return 0;
}
}
private static int compareNullables(Comparable a, Comparable b) {
if (a == b) {
return 0;
}
if (a == null) {
return -1;
}
if (b == null) {
return 1;
}
return a.compareTo(b);
}
}