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/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.search.aggregations.pipeline;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.script.Script;
import org.elasticsearch.search.DocValueFormat;
import org.elasticsearch.search.aggregations.pipeline.BucketHelpers.GapPolicy;
import org.elasticsearch.xcontent.ConstructingObjectParser;
import org.elasticsearch.xcontent.ObjectParser;
import org.elasticsearch.xcontent.XContentBuilder;
import org.elasticsearch.xcontent.XContentParser;
import java.io.IOException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.TreeMap;
import static org.elasticsearch.search.aggregations.pipeline.PipelineAggregator.Parser.BUCKETS_PATH;
import static org.elasticsearch.search.aggregations.pipeline.PipelineAggregator.Parser.FORMAT;
import static org.elasticsearch.search.aggregations.pipeline.PipelineAggregator.Parser.GAP_POLICY;
import static org.elasticsearch.xcontent.ConstructingObjectParser.constructorArg;
public class BucketScriptPipelineAggregationBuilder extends AbstractPipelineAggregationBuilder {
public static final String NAME = "bucket_script";
private final Script script;
private final Map bucketsPathsMap;
private String format = null;
private GapPolicy gapPolicy = GapPolicy.SKIP;
public static final ConstructingObjectParser PARSER = new ConstructingObjectParser<>(
NAME,
false,
(args, name) -> {
@SuppressWarnings("unchecked")
Map bucketsPathsMap = (Map) args[0];
return new BucketScriptPipelineAggregationBuilder(name, bucketsPathsMap, (Script) args[1]);
}
);
static {
PARSER.declareField(
constructorArg(),
BucketScriptPipelineAggregationBuilder::extractBucketPath,
BUCKETS_PATH_FIELD,
ObjectParser.ValueType.OBJECT_ARRAY_OR_STRING
);
Script.declareScript(PARSER, constructorArg());
PARSER.declareString(BucketScriptPipelineAggregationBuilder::format, FORMAT);
PARSER.declareField(BucketScriptPipelineAggregationBuilder::gapPolicy, p -> {
if (p.currentToken() == XContentParser.Token.VALUE_STRING) {
return GapPolicy.parse(p.text().toLowerCase(Locale.ROOT), p.getTokenLocation());
}
throw new IllegalArgumentException("Unsupported token [" + p.currentToken() + "]");
}, GAP_POLICY, ObjectParser.ValueType.STRING);
};
public BucketScriptPipelineAggregationBuilder(String name, Map bucketsPathsMap, Script script) {
super(name, NAME, new TreeMap<>(bucketsPathsMap).values().toArray(new String[bucketsPathsMap.size()]));
this.bucketsPathsMap = bucketsPathsMap;
this.script = script;
}
public BucketScriptPipelineAggregationBuilder(String name, Script script, String... bucketsPaths) {
this(name, convertToBucketsPathMap(bucketsPaths), script);
}
/**
* Read from a stream.
*/
public BucketScriptPipelineAggregationBuilder(StreamInput in) throws IOException {
super(in, NAME);
int mapSize = in.readVInt();
bucketsPathsMap = new HashMap<>(mapSize);
for (int i = 0; i < mapSize; i++) {
bucketsPathsMap.put(in.readString(), in.readString());
}
script = new Script(in);
format = in.readOptionalString();
gapPolicy = GapPolicy.readFrom(in);
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeVInt(bucketsPathsMap.size());
for (Entry e : bucketsPathsMap.entrySet()) {
out.writeString(e.getKey());
out.writeString(e.getValue());
}
script.writeTo(out);
out.writeOptionalString(format);
gapPolicy.writeTo(out);
}
private static Map extractBucketPath(XContentParser parser) throws IOException {
XContentParser.Token token = parser.currentToken();
if (token == XContentParser.Token.VALUE_STRING) {
// input is a string, name of the path set to '_value'.
// This is a bit odd as there is not constructor for it
return Collections.singletonMap("_value", parser.text());
} else if (token == XContentParser.Token.START_ARRAY) {
// input is an array, name of the path set to '_value' + position
Map bucketsPathsMap = new HashMap<>();
int i = 0;
while ((parser.nextToken()) != XContentParser.Token.END_ARRAY) {
String path = parser.text();
bucketsPathsMap.put("_value" + i++, path);
}
return bucketsPathsMap;
} else {
// input is an object, it should contain name / value pairs
return parser.mapStrings();
}
}
private static Map convertToBucketsPathMap(String[] bucketsPaths) {
Map bucketsPathsMap = new HashMap<>();
for (int i = 0; i < bucketsPaths.length; i++) {
bucketsPathsMap.put("_value" + i, bucketsPaths[i]);
}
return bucketsPathsMap;
}
/**
* Sets the format to use on the output of this aggregation.
*/
public BucketScriptPipelineAggregationBuilder 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;
}
}
/**
* Sets the gap policy to use for this aggregation.
*/
public BucketScriptPipelineAggregationBuilder gapPolicy(GapPolicy gapPolicy) {
if (gapPolicy == null) {
throw new IllegalArgumentException("[gapPolicy] must not be null: [" + name + "]");
}
this.gapPolicy = gapPolicy;
return this;
}
/**
* Gets the gap policy to use for this aggregation.
*/
public GapPolicy gapPolicy() {
return gapPolicy;
}
@Override
protected PipelineAggregator createInternal(Map metadata) {
return new BucketScriptPipelineAggregator(name, bucketsPathsMap, script, formatter(), gapPolicy, metadata);
}
@Override
protected XContentBuilder internalXContent(XContentBuilder builder, Params params) throws IOException {
builder.field(BUCKETS_PATH.getPreferredName(), bucketsPathsMap);
builder.field(Script.SCRIPT_PARSE_FIELD.getPreferredName(), script);
if (format != null) {
builder.field(FORMAT.getPreferredName(), format);
}
builder.field(GAP_POLICY.getPreferredName(), gapPolicy.getName());
return builder;
}
@Override
protected void validate(ValidationContext context) {
context.validateHasParent(NAME, name);
}
@Override
protected boolean overrideBucketsPath() {
return true;
}
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), bucketsPathsMap, script, format, gapPolicy);
}
@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;
BucketScriptPipelineAggregationBuilder other = (BucketScriptPipelineAggregationBuilder) obj;
return Objects.equals(bucketsPathsMap, other.bucketsPathsMap)
&& Objects.equals(script, other.script)
&& Objects.equals(format, other.format)
&& Objects.equals(gapPolicy, other.gapPolicy);
}
@Override
public String getWriteableName() {
return NAME;
}
}