PercentileParser.java

/**
 * Copyright 2012-2013 LMAX Ltd.
 *
 * 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 com.lmax.ant.paralleljunit;

import org.apache.tools.ant.BuildException;

class PercentileParser
{
    private NumberParser numberParser;
    private final int availableProcessors;

    public PercentileParser(final NumberParser numberParser, final int availableProcessors)
    {
        this.numberParser = numberParser;
        this.availableProcessors = availableProcessors;
    }

    public int parse(final String percentileThreadsParam)
    {
        final int percent = numberParser.parse(percentileThreadsParam.replace("%", ""));
        if (percent < 0)
        {
            throw new BuildException("Not a valid thread count [" + percentileThreadsParam + "]");
        }
        return (int) (0.01 * percent * availableProcessors);
    }

}