com.rapiddweller.common.SysUtil Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of rd-lib-common Show documentation

'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

There is a newer version: 2.0.1-jdk-11

Show newest version

/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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.rapiddweller.common;

import java.util.concurrent.Callable;

/**
 * Provides system related utility methods.
 * Created: 21.10.2009 19:26:24
 *
 * @author Volker Bergmann
 * @since 0.5.0
 */
public class SysUtil {

  private SysUtil() {
  }

  /**
   * Run with system property.
   *
   * @param name   the name
   * @param value  the value
   * @param runner the runner
   */
  public static void runWithSystemProperty(String name, String value, Runnable runner) {
    String oldValue = System.getProperty(name);
    try {
      System.setProperty(name, value);
      runner.run();
    } finally {
      System.setProperty(name, (oldValue != null ? oldValue : ""));
    }
  }

  /**
   * Call with system property t.
   *
   * @param     the type parameter
   * @param name   the name
   * @param value  the value
   * @param callee the callee
   * @return the t
   * @throws Exception the exception
   */
  public static  T callWithSystemProperty(String name, String value, Callable callee) throws Exception {
    String oldValue = System.getProperty(name);
    try {
      System.setProperty(name, value);
      return callee.call();
    } finally {
      System.setProperty(name, oldValue);
    }
  }

}