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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.pipeline.cumulativesum;
import org.elasticsearch.common.ParsingException;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.search.DocValueFormat;
import org.elasticsearch.search.aggregations.AggregatorFactory;
import org.elasticsearch.search.aggregations.PipelineAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.histogram.DateHistogramAggregatorFactory;
import org.elasticsearch.search.aggregations.bucket.histogram.HistogramAggregatorFactory;
import org.elasticsearch.search.aggregations.pipeline.AbstractPipelineAggregationBuilder;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.pipeline.bucketmetrics.BucketMetricsParser;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import static org.elasticsearch.search.aggregations.pipeline.PipelineAggregator.Parser.BUCKETS_PATH;
import static org.elasticsearch.search.aggregations.pipeline.PipelineAggregator.Parser.FORMAT;
public class CumulativeSumPipelineAggregationBuilder extends AbstractPipelineAggregationBuilder<CumulativeSumPipelineAggregationBuilder> {
public static final String NAME = "cumulative_sum";
private String format;
public CumulativeSumPipelineAggregationBuilder(String name, String bucketsPath) {
super(name, NAME, new String[] { bucketsPath });
}
/**
* Read from a stream.
*/
public CumulativeSumPipelineAggregationBuilder(StreamInput in) throws IOException {
super(in, NAME);
format = in.readOptionalString();
}
@Override
protected final void doWriteTo(StreamOutput out) throws IOException {
out.writeOptionalString(format);
}
/**
* Sets the format to use on the output of this aggregation.
*/
public CumulativeSumPipelineAggregationBuilder format(String format) {
if (format == null) {
throw new IllegalArgumentException("[format] must not be null: [" + name + "]");
}
this.format = format;
return this;
}
/**
* Gets the format to use on the output of this aggregation.
*/
public String format() {
return format;
}
protected DocValueFormat formatter() {
if (format != null) {
return new DocValueFormat.Decimal(format);
} else {
return DocValueFormat.RAW;
}
}
@Override
protected PipelineAggregator createInternal(Map<String, Object> metaData) throws IOException {
return new CumulativeSumPipelineAggregator(name, bucketsPaths, formatter(), metaData);
}
@Override
public void doValidate(AggregatorFactory<?> parent, AggregatorFactory<?>[] aggFactories,
List<PipelineAggregationBuilder> pipelineAggregatorFactories) {
if (bucketsPaths.length != 1) {
throw new IllegalStateException(BUCKETS_PATH.getPreferredName()
+ " must contain a single entry for aggregation [" + name + "]");
}
if (parent instanceof HistogramAggregatorFactory) {
HistogramAggregatorFactory histoParent = (HistogramAggregatorFactory) parent;
if (histoParent.minDocCount() != 0) {
throw new IllegalStateException("parent histogram of cumulative sum aggregation [" + name
+ "] must have min_doc_count of 0");
}
} else if (parent instanceof DateHistogramAggregatorFactory) {
DateHistogramAggregatorFactory histoParent = (DateHistogramAggregatorFactory) parent;
if (histoParent.minDocCount() != 0) {
throw new IllegalStateException("parent histogram of cumulative sum aggregation [" + name
+ "] must have min_doc_count of 0");
}
} else {
throw new IllegalStateException("cumulative sum aggregation [" + name
+ "] must have a histogram or date_histogram as parent");
}
}
@Override
protected final XContentBuilder internalXContent(XContentBuilder builder, Params params) throws IOException {
if (format != null) {
builder.field(BucketMetricsParser.FORMAT.getPreferredName(), format);
}
return builder;
}
public static CumulativeSumPipelineAggregationBuilder parse(String pipelineAggregatorName, XContentParser parser)
throws IOException {
XContentParser.Token token;
String currentFieldName = null;
String[] bucketsPaths = null;
String format = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.VALUE_STRING) {
if (FORMAT.match(currentFieldName)) {
format = parser.text();
} else if (BUCKETS_PATH.match(currentFieldName)) {
bucketsPaths = new String[] { parser.text() };
} else {
throw new ParsingException(parser.getTokenLocation(),
"Unknown key for a " + token + " in [" + pipelineAggregatorName + "]: [" + currentFieldName + "].");
}
} else if (token == XContentParser.Token.START_ARRAY) {
if (BUCKETS_PATH.match(currentFieldName)) {
List<String> paths = new ArrayList<>();
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
String path = parser.text();
paths.add(path);
}
bucketsPaths = paths.toArray(new String[paths.size()]);
} else {
throw new ParsingException(parser.getTokenLocation(),
"Unknown key for a " + token + " in [" + pipelineAggregatorName + "]: [" + currentFieldName + "].");
}
} else {
throw new ParsingException(parser.getTokenLocation(),
"Unexpected token " + token + " in [" + pipelineAggregatorName + "].");
}
}
if (bucketsPaths == null) {
throw new ParsingException(parser.getTokenLocation(), "Missing required field [" + BUCKETS_PATH.getPreferredName()
+ "] for derivative aggregation [" + pipelineAggregatorName + "]");
}
CumulativeSumPipelineAggregationBuilder factory =
new CumulativeSumPipelineAggregationBuilder(pipelineAggregatorName, bucketsPaths[0]);
if (format != null) {
factory.format(format);
}
return factory;
}
@Override
protected int doHashCode() {
return Objects.hash(format);
}
@Override
protected boolean doEquals(Object obj) {
CumulativeSumPipelineAggregationBuilder other = (CumulativeSumPipelineAggregationBuilder) obj;
return Objects.equals(format, other.format);
}
@Override
public String getWriteableName() {
return NAME;
}
}
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