001    /*
002     * Copyright (C) 2012 eXo Platform SAS.
003     *
004     * This is free software; you can redistribute it and/or modify it
005     * under the terms of the GNU Lesser General Public License as
006     * published by the Free Software Foundation; either version 2.1 of
007     * the License, or (at your option) any later version.
008     *
009     * This software is distributed in the hope that it will be useful,
010     * but WITHOUT ANY WARRANTY; without even the implied warranty of
011     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012     * Lesser General Public License for more details.
013     *
014     * You should have received a copy of the GNU Lesser General Public
015     * License along with this software; if not, write to the Free
016     * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017     * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018     */
019    package org.crsh.util;
020    
021    import javax.naming.Context;
022    import javax.naming.NamingException;
023    import java.io.Closeable;
024    import java.io.IOException;
025    import java.net.Socket;
026    import java.sql.Connection;
027    import java.sql.ResultSet;
028    import java.sql.SQLException;
029    import java.sql.Statement;
030    
031    public class Safe {
032    
033      public static void close(Socket socket) {
034        if (socket != null) {
035          try {
036            socket.close();
037          }
038          catch (IOException ignore) {
039          }
040        }
041      }
042    
043      public static void close(Closeable closeable) {
044        if (closeable != null) {
045          try {
046            closeable.close();
047          }
048          catch (IOException ignore) {
049          }
050        }
051      }
052    
053      public static void close(Connection connection) {
054        if (connection != null) {
055          try {
056            connection.close();
057          }
058          catch (SQLException ignore) {
059          }
060        }
061      }
062    
063      public static void close(Statement statement) {
064        if (statement != null) {
065          try {
066            statement.close();
067          }
068          catch (SQLException ignore) {
069          }
070        }
071      }
072    
073      public static void close(ResultSet rs) {
074        if (rs != null) {
075          try {
076            rs.close();
077          }
078          catch (SQLException ignore) {
079          }
080        }
081      }
082    
083       public static void close(Context rs) {
084          if (rs != null) {
085             try {
086                rs.close();
087             }
088             catch (NamingException ignore) {
089             }
090          }
091       }
092    
093       public static <T extends Throwable> void rethrow(Class<T> throwableClass, Throwable cause) throws T {
094        T throwable;
095    
096        //
097        try {
098          throwable = throwableClass.newInstance();
099        }
100        catch (Exception e) {
101          throw new AssertionError(e);
102        }
103    
104        //
105        throwable.initCause(cause);
106    
107        //
108        throw throwable;
109      }
110    
111      public static boolean equals(Object o1, Object o2) {
112        return o1 == null ? o2 == null : (o2 != null && o1.equals(o2));
113      }
114    
115      public static boolean notEquals(Object o1, Object o2) {
116        return !equals(o1, o2);
117      }
118    }