/*
* 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.common.unit;
import org.elasticsearch.ElasticsearchParseException;
/**
* Utility class to represent ratio and percentage values between 0 and 100
*/
public class RatioValue {
private final double percent;
public RatioValue(double percent) {
this.percent = percent;
}
public double getAsRatio() {
return this.percent / 100.0;
}
public double getAsPercent() {
return this.percent;
}
public String toString() {
return this.percent + "%";
}
/**
* Parses the provided string as a {@link RatioValue}, the string can
* either be in percentage format (eg. 73.5%), or a floating-point ratio
* format (eg. 0.735)
*/
public static RatioValue parseRatioValue(String sValue) {
if (sValue.endsWith("%")) {
final String percentAsString = sValue.substring(0, sValue.length() - 1);
try {
final double percent = Double.parseDouble(percentAsString);
if (percent < 0 || percent > 100) {
throw new ElasticsearchParseException("Percentage should be in [0-100], got " + percentAsString);
}
return new RatioValue(Math.abs(percent));
} catch (NumberFormatException e) {
throw new ElasticsearchParseException("Failed to parse [" + percentAsString + "] as a double", e);
}
} else {
try {
double ratio = Double.parseDouble(sValue);
if (ratio < 0 || ratio > 1.0) {
throw new ElasticsearchParseException("Ratio should be in [0-1.0], got " + ratio);
}
return new RatioValue(100.0 * Math.abs(ratio));
} catch (NumberFormatException e) {
throw new ElasticsearchParseException("Invalid ratio or percentage: [" + sValue + "]");
}
}
}
}