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org.opensearch.search.aggregations.pipeline.BucketSelectorPipelineAggregationBuilder Maven / Gradle / Ivy
/*
* SPDX-License-Identifier: Apache-2.0
*
* The OpenSearch Contributors require contributions made to
* this file be licensed under the Apache-2.0 license or a
* compatible open source license.
*/
/*
* 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.
*/
/*
* Modifications Copyright OpenSearch Contributors. See
* GitHub history for details.
*/
package org.opensearch.search.aggregations.pipeline;
import org.opensearch.common.ParsingException;
import org.opensearch.common.io.stream.StreamInput;
import org.opensearch.common.io.stream.StreamOutput;
import org.opensearch.common.xcontent.XContentBuilder;
import org.opensearch.common.xcontent.XContentParser;
import org.opensearch.script.Script;
import org.opensearch.search.aggregations.pipeline.BucketHelpers.GapPolicy;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.TreeMap;
import static org.opensearch.search.aggregations.pipeline.PipelineAggregator.Parser.BUCKETS_PATH;
import static org.opensearch.search.aggregations.pipeline.PipelineAggregator.Parser.GAP_POLICY;
public class BucketSelectorPipelineAggregationBuilder extends AbstractPipelineAggregationBuilder {
public static final String NAME = "bucket_selector";
private final Map bucketsPathsMap;
private final Script script;
private GapPolicy gapPolicy = GapPolicy.SKIP;
public BucketSelectorPipelineAggregationBuilder(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 BucketSelectorPipelineAggregationBuilder(String name, Script script, String... bucketsPaths) {
this(name, convertToBucketsPathMap(bucketsPaths), script);
}
/**
* Read from a stream.
*/
public BucketSelectorPipelineAggregationBuilder(StreamInput in) throws IOException {
super(in, NAME);
bucketsPathsMap = in.readMap(StreamInput::readString, StreamInput::readString);
script = new Script(in);
gapPolicy = GapPolicy.readFrom(in);
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeMap(bucketsPathsMap, StreamOutput::writeString, StreamOutput::writeString);
script.writeTo(out);
gapPolicy.writeTo(out);
}
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 gap policy to use for this aggregation.
*/
public BucketSelectorPipelineAggregationBuilder 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 BucketSelectorPipelineAggregator(name, bucketsPathsMap, script, 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);
builder.field(GAP_POLICY.getPreferredName(), gapPolicy.getName());
return builder;
}
public static BucketSelectorPipelineAggregationBuilder parse(String reducerName, XContentParser parser) throws IOException {
XContentParser.Token token;
Script script = null;
String currentFieldName = null;
Map bucketsPathsMap = null;
GapPolicy gapPolicy = 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 (BUCKETS_PATH.match(currentFieldName, parser.getDeprecationHandler())) {
bucketsPathsMap = new HashMap<>();
bucketsPathsMap.put("_value", parser.text());
} else if (GAP_POLICY.match(currentFieldName, parser.getDeprecationHandler())) {
gapPolicy = GapPolicy.parse(parser.text(), parser.getTokenLocation());
} else if (Script.SCRIPT_PARSE_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
script = Script.parse(parser);
} else {
throw new ParsingException(
parser.getTokenLocation(),
"Unknown key for a " + token + " in [" + reducerName + "]: [" + currentFieldName + "]."
);
}
} else if (token == XContentParser.Token.START_ARRAY) {
if (BUCKETS_PATH.match(currentFieldName, parser.getDeprecationHandler())) {
List paths = new ArrayList<>();
while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
String path = parser.text();
paths.add(path);
}
bucketsPathsMap = new HashMap<>();
for (int i = 0; i < paths.size(); i++) {
bucketsPathsMap.put("_value" + i, paths.get(i));
}
} else {
throw new ParsingException(
parser.getTokenLocation(),
"Unknown key for a " + token + " in [" + reducerName + "]: [" + currentFieldName + "]."
);
}
} else if (token == XContentParser.Token.START_OBJECT) {
if (Script.SCRIPT_PARSE_FIELD.match(currentFieldName, parser.getDeprecationHandler())) {
script = Script.parse(parser);
} else if (BUCKETS_PATH.match(currentFieldName, parser.getDeprecationHandler())) {
Map map = parser.map();
bucketsPathsMap = new HashMap<>();
for (Map.Entry entry : map.entrySet()) {
bucketsPathsMap.put(entry.getKey(), String.valueOf(entry.getValue()));
}
} else {
throw new ParsingException(
parser.getTokenLocation(),
"Unknown key for a " + token + " in [" + reducerName + "]: [" + currentFieldName + "]."
);
}
} else {
throw new ParsingException(parser.getTokenLocation(), "Unexpected token " + token + " in [" + reducerName + "].");
}
}
if (bucketsPathsMap == null) {
throw new ParsingException(
parser.getTokenLocation(),
"Missing required field [" + BUCKETS_PATH.getPreferredName() + "] for bucket_selector aggregation [" + reducerName + "]"
);
}
if (script == null) {
throw new ParsingException(
parser.getTokenLocation(),
"Missing required field ["
+ Script.SCRIPT_PARSE_FIELD.getPreferredName()
+ "] for bucket_selector aggregation ["
+ reducerName
+ "]"
);
}
BucketSelectorPipelineAggregationBuilder factory = new BucketSelectorPipelineAggregationBuilder(
reducerName,
bucketsPathsMap,
script
);
if (gapPolicy != null) {
factory.gapPolicy(gapPolicy);
}
return factory;
}
@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, 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;
BucketSelectorPipelineAggregationBuilder other = (BucketSelectorPipelineAggregationBuilder) obj;
return Objects.equals(bucketsPathsMap, other.bucketsPathsMap)
&& Objects.equals(script, other.script)
&& Objects.equals(gapPolicy, other.gapPolicy);
}
@Override
public String getWriteableName() {
return NAME;
}
}