DetectionUtils.java

/*
 * Copyright 2014 OCTO Technology
 *
 * 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.octo.reactive.audit;

final class DetectionUtils
{
	private DetectionUtils()
	{
	}

	private static String getFullJavaVersion()
	{
		String runtime = System.getProperty("java.version");
		if (runtime == null)
		{
			return System.getProperty("java.runtime.version");
		}
		return runtime;
	}

	public static double getJavaRuntimeVersion()
	{
		String runtime = getFullJavaVersion();
		return getJavaRuntimeVersion(runtime);
	}

	private static double getJavaRuntimeVersion(String runtime)
	{
		int majorVersionPos = runtime.indexOf('.');
		int minorVersionPos = runtime.indexOf('.', majorVersionPos + 1);
		if (minorVersionPos == -1)
		{
			minorVersionPos = runtime.length();
		}
		return Double.parseDouble(runtime.substring(0, minorVersionPos));
	}

}