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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.derivative;
import org.elasticsearch.common.ParseField;
import org.elasticsearch.common.rounding.DateTimeUnit;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.search.SearchParseException;
import org.elasticsearch.search.aggregations.bucket.histogram.DateHistogramParser;
import org.elasticsearch.search.aggregations.pipeline.BucketHelpers.GapPolicy;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregator;
import org.elasticsearch.search.aggregations.pipeline.PipelineAggregatorFactory;
import org.elasticsearch.search.aggregations.support.format.ValueFormat;
import org.elasticsearch.search.aggregations.support.format.ValueFormatter;
import org.elasticsearch.search.internal.SearchContext;
import org.joda.time.DateTimeZone;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class DerivativeParser implements PipelineAggregator.Parser {
public static final ParseField FORMAT = new ParseField("format");
public static final ParseField GAP_POLICY = new ParseField("gap_policy");
public static final ParseField UNIT = new ParseField("unit");
@Override
public String type() {
return DerivativePipelineAggregator.TYPE.name();
}
@Override
public PipelineAggregatorFactory parse(String pipelineAggregatorName, XContentParser parser, SearchContext context) throws IOException {
XContentParser.Token token;
String currentFieldName = null;
String[] bucketsPaths = null;
String format = null;
String units = null;
GapPolicy gapPolicy = GapPolicy.SKIP;
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 (context.parseFieldMatcher().match(currentFieldName, FORMAT)) {
format = parser.text();
} else if (context.parseFieldMatcher().match(currentFieldName, BUCKETS_PATH)) {
bucketsPaths = new String[] { parser.text() };
} else if (context.parseFieldMatcher().match(currentFieldName, GAP_POLICY)) {
gapPolicy = GapPolicy.parse(context, parser.text(), parser.getTokenLocation());
} else if (context.parseFieldMatcher().match(currentFieldName, UNIT)) {
units = parser.text();
} else {
throw new SearchParseException(context, "Unknown key for a " + token + " in [" + pipelineAggregatorName + "]: ["
+ currentFieldName + "].", parser.getTokenLocation());
}
} else if (token == XContentParser.Token.START_ARRAY) {
if (context.parseFieldMatcher().match(currentFieldName, BUCKETS_PATH)) {
List 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 SearchParseException(context, "Unknown key for a " + token + " in [" + pipelineAggregatorName + "]: ["
+ currentFieldName + "].", parser.getTokenLocation());
}
} else {
throw new SearchParseException(context, "Unexpected token " + token + " in [" + pipelineAggregatorName + "].",
parser.getTokenLocation());
}
}
if (bucketsPaths == null) {
throw new SearchParseException(context, "Missing required field [" + BUCKETS_PATH.getPreferredName()
+ "] for derivative aggregation [" + pipelineAggregatorName + "]", parser.getTokenLocation());
}
ValueFormatter formatter = null;
if (format != null) {
formatter = ValueFormat.Patternable.Number.format(format).formatter();
} else {
formatter = ValueFormatter.RAW;
}
Long xAxisUnits = null;
if (units != null) {
DateTimeUnit dateTimeUnit = DateHistogramParser.DATE_FIELD_UNITS.get(units);
if (dateTimeUnit != null) {
xAxisUnits = dateTimeUnit.field(DateTimeZone.UTC).getDurationField().getUnitMillis();
} else {
TimeValue timeValue = TimeValue.parseTimeValue(units, null, getClass().getSimpleName() + ".unit");
if (timeValue != null) {
xAxisUnits = timeValue.getMillis();
}
}
}
return new DerivativePipelineAggregator.Factory(pipelineAggregatorName, bucketsPaths, formatter, gapPolicy, xAxisUnits);
}
}