Java tutorial
/* * Copyright (C) 2016 QAware GmbH * * Licensed 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 de.qaware.chronix.solr.query.analysis.functions.aggregations; import de.qaware.chronix.solr.query.analysis.functions.ChronixAggregation; import de.qaware.chronix.solr.query.analysis.functions.FunctionType; import de.qaware.chronix.timeseries.MetricTimeSeries; import org.apache.commons.lang3.builder.EqualsBuilder; import org.apache.commons.lang3.builder.HashCodeBuilder; import org.apache.commons.lang3.builder.ToStringBuilder; /** * Percentile aggregation analysis * * @author f.lautenschlager */ public final class Percentile implements ChronixAggregation<MetricTimeSeries> { private final double percentile; /** * Constructs a percentile aggregation * * @param percentile the percentile [0.0 ... 1.0] */ public Percentile(double percentile) { this.percentile = percentile; } /** * Calculates the percentile of the first time series. * * @param args the time series * @return the percentile or 0 if the list is empty */ @Override public double execute(MetricTimeSeries... args) { //Sum needs at least one time series if (args.length < 1) { throw new IllegalArgumentException("Percentile aggregation needs at least one time series"); } //Took the first time series MetricTimeSeries timeSeries = args[0]; //If it is empty, we return NaN if (timeSeries.size() <= 0) { return Double.NaN; } //Else calculate the analysis value return de.qaware.chronix.solr.query.analysis.functions.math.Percentile.evaluate(timeSeries.getValues(), percentile); } @Override public String[] getArguments() { return new String[] { "percentile=" + percentile }; } @Override public FunctionType getType() { return FunctionType.P; } @Override public boolean needSubquery() { return false; } @Override public String getSubquery() { return null; } @Override public boolean equals(Object obj) { if (obj == null) { return false; } if (obj == this) { return true; } if (obj.getClass() != getClass()) { return false; } Percentile rhs = (Percentile) obj; return new EqualsBuilder().append(this.percentile, rhs.percentile).isEquals(); } @Override public int hashCode() { return new HashCodeBuilder().append(percentile).toHashCode(); } @Override public String toString() { return new ToStringBuilder(this).append("percentile", percentile).toString(); } }