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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.support;
import org.elasticsearch.common.Nullable;
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.AbstractAggregationBuilder;
import org.elasticsearch.search.aggregations.AggregationInitializationException;
import org.elasticsearch.search.aggregations.AggregatorFactories;
import org.elasticsearch.search.aggregations.AggregatorFactories.Builder;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
/**
* Similar to {@link ValuesSourceAggregationBuilder}, except it references multiple ValuesSources (e.g. so that an aggregation
* can pull values from multiple fields).
*
* A limitation of this class is that all the ValuesSource's being refereenced must be of the same type.
*/
public abstract class MultiValuesSourceAggregationBuilder>
extends AbstractAggregationBuilder {
public abstract static class LeafOnly>
extends MultiValuesSourceAggregationBuilder {
protected LeafOnly(String name, ValueType targetValueType) {
super(name, targetValueType);
}
protected LeafOnly(LeafOnly clone, Builder factoriesBuilder, Map metaData) {
super(clone, factoriesBuilder, metaData);
if (factoriesBuilder.count() > 0) {
throw new AggregationInitializationException("Aggregator [" + name + "] of type ["
+ getType() + "] cannot accept sub-aggregations");
}
}
/**
* Read from a stream that does not serialize its targetValueType. This should be used by most subclasses.
*/
protected LeafOnly(StreamInput in, ValueType targetValueType) throws IOException {
super(in, targetValueType);
}
@Override
public AB subAggregations(Builder subFactories) {
throw new AggregationInitializationException("Aggregator [" + name + "] of type [" +
getType() + "] cannot accept sub-aggregations");
}
}
private Map fields = new HashMap<>();
private final ValueType targetValueType;
private ValueType valueType = null;
private String format = null;
protected MultiValuesSourceAggregationBuilder(String name, ValueType targetValueType) {
super(name);
this.targetValueType = targetValueType;
}
protected MultiValuesSourceAggregationBuilder(MultiValuesSourceAggregationBuilder clone,
Builder factoriesBuilder, Map metaData) {
super(clone, factoriesBuilder, metaData);
this.fields = new HashMap<>(clone.fields);
this.targetValueType = clone.targetValueType;
this.valueType = clone.valueType;
this.format = clone.format;
}
protected MultiValuesSourceAggregationBuilder(StreamInput in, ValueType targetValueType)
throws IOException {
super(in);
assert false == serializeTargetValueType() : "Wrong read constructor called for subclass that provides its targetValueType";
this.targetValueType = targetValueType;
read(in);
}
/**
* Read from a stream.
*/
@SuppressWarnings("unchecked")
private void read(StreamInput in) throws IOException {
fields = in.readMap(StreamInput::readString, MultiValuesSourceFieldConfig::new);
valueType = in.readOptionalWriteable(ValueType::readFromStream);
format = in.readOptionalString();
}
@Override
protected final void doWriteTo(StreamOutput out) throws IOException {
if (serializeTargetValueType()) {
out.writeOptionalWriteable(targetValueType);
}
out.writeMap(fields, StreamOutput::writeString, (o, value) -> value.writeTo(o));
out.writeOptionalWriteable(valueType);
out.writeOptionalString(format);
innerWriteTo(out);
}
/**
* Write subclass' state to the stream
*/
protected abstract void innerWriteTo(StreamOutput out) throws IOException;
@SuppressWarnings("unchecked")
protected AB field(String propertyName, MultiValuesSourceFieldConfig config) {
if (config == null) {
throw new IllegalArgumentException("[config] must not be null: [" + name + "]");
}
this.fields.put(propertyName, config);
return (AB) this;
}
public Map fields() {
return fields;
}
/**
* Sets the {@link ValueType} for the value produced by this aggregation
*/
@SuppressWarnings("unchecked")
public AB valueType(ValueType valueType) {
if (valueType == null) {
throw new IllegalArgumentException("[valueType] must not be null: [" + name + "]");
}
this.valueType = valueType;
return (AB) this;
}
/**
* Gets the {@link ValueType} for the value produced by this aggregation
*/
public ValueType valueType() {
return valueType;
}
/**
* Sets the format to use for the output of the aggregation.
*/
@SuppressWarnings("unchecked")
public AB format(String format) {
if (format == null) {
throw new IllegalArgumentException("[format] must not be null: [" + name + "]");
}
this.format = format;
return (AB) this;
}
/**
* Gets the format to use for the output of the aggregation.
*/
public String format() {
return format;
}
@Override
protected final MultiValuesSourceAggregatorFactory doBuild(SearchContext context, AggregatorFactory parent,
AggregatorFactories.Builder subFactoriesBuilder) throws IOException {
ValueType finalValueType = this.valueType != null ? this.valueType : targetValueType;
Map> configs = new HashMap<>(fields.size());
fields.forEach((key, value) -> {
ValuesSourceConfig config = ValuesSourceConfig.resolve(context.getQueryShardContext(), finalValueType,
value.getFieldName(), value.getScript(), value.getMissing(), value.getTimeZone(), format);
configs.put(key, config);
});
DocValueFormat docValueFormat = resolveFormat(format, finalValueType);
return innerBuild(context, configs, docValueFormat, parent, subFactoriesBuilder);
}
private static DocValueFormat resolveFormat(@Nullable String format, @Nullable ValueType valueType) {
if (valueType == null) {
return DocValueFormat.RAW; // we can't figure it out
}
DocValueFormat valueFormat = valueType.defaultFormat;
if (valueFormat instanceof DocValueFormat.Decimal && format != null) {
valueFormat = new DocValueFormat.Decimal(format);
}
return valueFormat;
}
protected abstract MultiValuesSourceAggregatorFactory innerBuild(SearchContext context,
Map> configs, DocValueFormat format, AggregatorFactory parent,
AggregatorFactories.Builder subFactoriesBuilder) throws IOException;
/**
* Should this builder serialize its targetValueType? Defaults to false. All subclasses that override this to true
* should use the three argument read constructor rather than the four argument version.
*/
protected boolean serializeTargetValueType() {
return false;
}
@Override
public final XContentBuilder internalXContent(XContentBuilder builder, Params params) throws IOException {
builder.startObject();
if (fields != null) {
builder.field(CommonFields.FIELDS.getPreferredName(), fields);
}
if (format != null) {
builder.field(CommonFields.FORMAT.getPreferredName(), format);
}
if (valueType != null) {
builder.field(CommonFields.VALUE_TYPE.getPreferredName(), valueType.getPreferredName());
}
doXContentBody(builder, params);
builder.endObject();
return builder;
}
protected abstract XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException;
@Override
protected final int doHashCode() {
return Objects.hash(fields, format, targetValueType, valueType, innerHashCode());
}
protected abstract int innerHashCode();
@Override
protected final boolean doEquals(Object other) {
if (this == other) {
return true;
}
if (other == null || getClass() != other.getClass()) {
return false;
}
MultiValuesSourceAggregationBuilder that = (MultiValuesSourceAggregationBuilder) other;
return Objects.equals(this.fields, that.fields)
&& Objects.equals(this.format, that.format)
&& Objects.equals(this.valueType, that.valueType);
}
protected abstract boolean innerEquals(Object obj);
}