001    /*
002     *  This file is part of the Jikes RVM project (http://jikesrvm.org).
003     *
004     *  This file is licensed to You under the Eclipse Public License (EPL);
005     *  You may not use this file except in compliance with the License. You
006     *  may obtain a copy of the License at
007     *
008     *      http://www.opensource.org/licenses/eclipse-1.0.php
009     *
010     *  See the COPYRIGHT.txt file distributed with this work for information
011     *  regarding copyright ownership.
012     */
013    package org.mmtk.utility.options;
014    
015    /**
016     * GC verbosity level.
017     */
018    public final class Verbose extends org.vmutil.options.IntOption {
019      /**
020       * Create the option.
021       */
022      public Verbose() {
023        super(Options.set, "Verbose",
024              "GC verbosity level",
025              0);
026      }
027    
028      /**
029       * Only accept non-negative values.
030       */
031      @Override
032      protected void validate() {
033        failIf(this.value < 0, "Unreasonable verbosity level");
034      }
035    }