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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.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.ObjectParser;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.mapper.MappedFieldType;
import org.elasticsearch.index.query.QueryShardContext;
import org.elasticsearch.search.aggregations.bucket.histogram.Histogram;
import org.elasticsearch.search.aggregations.support.ValueType;
import org.elasticsearch.search.aggregations.support.ValuesSource;
import org.elasticsearch.search.aggregations.support.ValuesSourceConfig;
import java.io.IOException;
import java.util.Objects;
/**
* A {@link CompositeValuesSourceBuilder} that builds a {@link HistogramValuesSource} from another numeric values source
* using the provided interval.
*/
public class HistogramValuesSourceBuilder extends CompositeValuesSourceBuilder {
static final String TYPE = "histogram";
private static final ObjectParser PARSER;
static {
PARSER = new ObjectParser<>(HistogramValuesSourceBuilder.TYPE);
PARSER.declareDouble(HistogramValuesSourceBuilder::interval, Histogram.INTERVAL_FIELD);
CompositeValuesSourceParserHelper.declareValuesSourceFields(PARSER, ValueType.NUMERIC);
}
static HistogramValuesSourceBuilder parse(String name, XContentParser parser) throws IOException {
return PARSER.parse(parser, new HistogramValuesSourceBuilder(name), null);
}
private double interval = 0;
public HistogramValuesSourceBuilder(String name) {
super(name, ValueType.DOUBLE);
}
protected HistogramValuesSourceBuilder(StreamInput in) throws IOException {
super(in);
this.interval = in.readDouble();
}
@Override
protected void innerWriteTo(StreamOutput out) throws IOException {
out.writeDouble(interval);
}
@Override
protected void doXContentBody(XContentBuilder builder, Params params) throws IOException {
builder.field(Histogram.INTERVAL_FIELD.getPreferredName(), interval);
}
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), interval);
}
@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;
HistogramValuesSourceBuilder other = (HistogramValuesSourceBuilder) obj;
return Objects.equals(interval, other.interval);
}
@Override
public String type() {
return TYPE;
}
/**
* Returns the interval that is set on this source
**/
public double interval() {
return interval;
}
/**
* Sets the interval on this source.
**/
public HistogramValuesSourceBuilder interval(double interval) {
if (interval <= 0) {
throw new IllegalArgumentException("[interval] must be greater than 0 for [histogram] source");
}
this.interval = interval;
return this;
}
@Override
protected CompositeValuesSourceConfig innerBuild(QueryShardContext queryShardContext, ValuesSourceConfig config) throws IOException {
ValuesSource orig = config.toValuesSource(queryShardContext);
if (orig == null) {
orig = ValuesSource.Numeric.EMPTY;
}
if (orig instanceof ValuesSource.Numeric) {
ValuesSource.Numeric numeric = (ValuesSource.Numeric) orig;
final HistogramValuesSource vs = new HistogramValuesSource(numeric, interval);
final MappedFieldType fieldType = config.fieldContext() != null ? config.fieldContext().fieldType() : null;
return new CompositeValuesSourceConfig(name, fieldType, vs, config.format(), order(),
missingBucket(), script() != null);
} else {
throw new IllegalArgumentException("invalid source, expected numeric, got " + orig.getClass().getSimpleName());
}
}
}