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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.bucketselector;
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.script.Script;
import org.elasticsearch.search.aggregations.pipeline.AbstractPipelineAggregationBuilder;
import org.elasticsearch.search.aggregations.pipeline.BucketHelpers.GapPolicy;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
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.GAP_POLICY;
public class BucketSelectorPipelineAggregationBuilder extends AbstractPipelineAggregationBuilder<BucketSelectorPipelineAggregationBuilder> {
public static final String NAME = "bucket_selector";
private final Map<String, String> bucketsPathsMap;
private Script script;
private GapPolicy gapPolicy = GapPolicy.SKIP;
public BucketSelectorPipelineAggregationBuilder(String name, Map<String, String> 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);
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);
gapPolicy = GapPolicy.readFrom(in);
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
out.writeVInt(bucketsPathsMap.size());
for (Entry<String, String> e : bucketsPathsMap.entrySet()) {
out.writeString(e.getKey());
out.writeString(e.getValue());
}
script.writeTo(out);
gapPolicy.writeTo(out);
}
private static Map<String, String> convertToBucketsPathMap(String[] bucketsPaths) {
Map<String, String> 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<String, Object> metaData) throws IOException {
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<String, String> 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)) {
bucketsPathsMap = new HashMap<>();
bucketsPathsMap.put("_value", parser.text());
} else if (GAP_POLICY.match(currentFieldName)) {
gapPolicy = GapPolicy.parse(parser.text(), parser.getTokenLocation());
} else if (Script.SCRIPT_PARSE_FIELD.match(currentFieldName)) {
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)) {
List<String> 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)) {
script = Script.parse(parser);
} else if (BUCKETS_PATH.match(currentFieldName)) {
Map<String, Object> map = parser.map();
bucketsPathsMap = new HashMap<>();
for (Map.Entry<String, Object> 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 boolean overrideBucketsPath() {
return true;
}
@Override
protected int doHashCode() {
return Objects.hash(bucketsPathsMap, script, gapPolicy);
}
@Override
protected boolean doEquals(Object obj) {
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;
}
}
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