001    /* LockInfo.java - Information on a lock.
002       Copyright (C) 2006 Free Software Foundation
003    
004    This file is part of GNU Classpath.
005    
006    GNU Classpath is free software; you can redistribute it and/or modify
007    it under the terms of the GNU General Public License as published by
008    the Free Software Foundation; either version 2, or (at your option)
009    any later version.
010    
011    GNU Classpath is distributed in the hope that it will be useful, but
012    WITHOUT ANY WARRANTY; without even the implied warranty of
013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014    General Public License for more details.
015    
016    You should have received a copy of the GNU General Public License
017    along with GNU Classpath; see the file COPYING.  If not, write to the
018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019    02110-1301 USA.
020    
021    Linking this library statically or dynamically with other modules is
022    making a combined work based on this library.  Thus, the terms and
023    conditions of the GNU General Public License cover the whole
024    combination.
025    
026    As a special exception, the copyright holders of this library give you
027    permission to link this library with independent modules to produce an
028    executable, regardless of the license terms of these independent
029    modules, and to copy and distribute the resulting executable under
030    terms of your choice, provided that you also meet, for each linked
031    independent module, the terms and conditions of the license of that
032    module.  An independent module is a module which is not derived from
033    or based on this library.  If you modify this library, you may extend
034    this exception to your version of the library, but you are not
035    obligated to do so.  If you do not wish to do so, delete this
036    exception statement from your version. */
037    
038    package java.lang.management;
039    
040    import java.beans.ConstructorProperties;
041    
042    /**
043     * Provides information on a lock held by a thread.
044     * A lock can be either a built-in monitor, an
045     * <emph>ownable synchronizer</emph> (i.e. a subclass
046     * of {@link java.util.concurrent.locks.AbstractOwnableSynchronizer}),
047     * or a {@link java.util.concurrent.locks.Condition}
048     * object.
049     *
050     * @author Andrew John Hughes (gnu_andrew@member.fsf.org)
051     * @since 1.6
052     */
053    public class LockInfo
054    {
055    
056      /**
057       * The class name of the lock object.
058       */
059      private String className;
060    
061      /**
062       * The identity hash code of the lock object.
063       */
064      private int identityHashCode;
065    
066      /**
067       * Constructs a new {@link LockInfo} object with the
068       * specified class name and identity hash code.
069       *
070       * @param className the name of the class of the lock object.
071       * @param identityHashCode the identity hash code of the
072       *                         lock object.
073       */
074      @ConstructorProperties({"className","identityHashCode"})
075        public LockInfo(String className, int identityHashCode)
076      {
077        this.className = className;
078        this.identityHashCode = identityHashCode;
079      }
080    
081      /**
082       * Returns the class name of the lock object.
083       *
084       * @return the class name of the lock object.
085       */
086      public String getClassName()
087      {
088        return className;
089      }
090    
091      /**
092       * Returns the identity hash code of the lock object.
093       *
094       * @return the identity hash code of the lock object.
095       */
096      public int getIdentityHashCode()
097      {
098        return identityHashCode;
099      }
100    
101      /**
102       * Returns a textual representation of the lock,
103       * constructed by concatenating the class name,
104       * <code>'@'</code> and the identity hash code
105       * in unsigned hexadecimal form.
106       *
107       * @return a textual representation of the lock.
108       */
109      public String toString()
110      {
111        return className + '@' + Integer.toHexString(identityHashCode);
112      }
113    
114    }