misc/env/src/main/java/org/onap/aaf/misc/env/LogTarget.java

   1 /**\r
   2  * ============LICENSE_START====================================================\r
   3  * org.onap.aaf\r
   4  * ===========================================================================\r
   5  * Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.\r
   6  * ===========================================================================\r
   7  * Licensed under the Apache License, Version 2.0 (the "License");\r
   8  * you may not use this file except in compliance with the License.\r
   9  * You may obtain a copy of the License at\r
  10  * \r
  11  *      http://www.apache.org/licenses/LICENSE-2.0\r
  12  * \r
  13  * Unless required by applicable law or agreed to in writing, software\r
  14  * distributed under the License is distributed on an "AS IS" BASIS,\r
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
  16  * See the License for the specific language governing permissions and\r
  17  * limitations under the License.\r
  18  * ============LICENSE_END====================================================\r
  19  *\r
  20  */\r
  21 \r
  22 package org.onap.aaf.misc.env;\r
  23 \r
  24 import java.io.PrintStream;\r
  25 import java.util.Date;\r
  26 \r
  27 import org.onap.aaf.misc.env.util.Chrono;\r
  28 \r
  29 /**\r
  30  * LogTarget is the interface with which to assign any kind of Logging Implementations.\r
  31  * \r
  32  * Implement for any Logging Library of your choice, and for any logging string Format desired.\r
  33  * \r
  34  * Included are several Static Implementations for various uses:\r
  35  *       NULL: Does nothing with Logging Messages\r
  36  *   SYSOUT: Writes messages in general form to System Out\r
  37  *   SYSERR: Writes messages in general form to System Err\r
  38  *   \r
  39  * @author Jonathan\r
  40  *\r
  41  */\r
  42 public interface LogTarget {\r
  43         public abstract void log(Object... msgs);\r
  44         public abstract void log(Throwable e, Object ... msgs);\r
  45         public abstract boolean isLoggable();\r
  46         public abstract void printf(String fmt, Object ... vars);\r
  47 \r
  48         // A Convenient LogTarget to insert when a NO-OP is desired.\r
  49         public static final LogTarget NULL = new LogTarget() {\r
  50                 public void log(Object ... msgs) {\r
  51                 }\r
  52 \r
  53                 public void log(Throwable t, Object ... msgs) {\r
  54                 }\r
  55 \r
  56                 public boolean isLoggable() {\r
  57                         return false;\r
  58                 }\r
  59 \r
  60                 @Override\r
  61                 public void printf(String fmt, Object ... vars) {\r
  62                 }\r
  63         };\r
  64 \r
  65         // A Convenient LogTarget to write to the Console\r
  66         public static final LogTarget SYSOUT = new LogTarget() {\r
  67                 public void log(Object ... msgs) {\r
  68                         PrintStream out = System.out;\r
  69                         out.print(org.onap.aaf.misc.env.util.Chrono.dateFmt.format(new Date()));\r
  70                         out.print(": ");\r
  71                         for(Object str : msgs) {\r
  72                                 if(str!=null) {\r
  73                                         out.print(str.toString());\r
  74                                         out.print(' ');\r
  75                                 } else {\r
  76                                         out.print("null ");\r
  77                                 }\r
  78                         }\r
  79                         out.println();\r
  80                 }\r
  81 \r
  82                 public void log(Throwable t, Object ... msgs) {\r
  83                         PrintStream out = System.out;\r
  84                         out.print(Chrono.dateFmt.format(new Date()));\r
  85                         out.print(": ");\r
  86                         for(Object str : msgs) {\r
  87                                 out.print(str.toString());\r
  88                                 out.print(' ');\r
  89                         }\r
  90                         out.println();\r
  91                         t.printStackTrace(out);\r
  92                         out.println();\r
  93                 }\r
  94 \r
  95                 public boolean isLoggable() {\r
  96                         return true;\r
  97                 }\r
  98 \r
  99                 @Override\r
 100                 public void printf(String fmt, Object ... vars) {\r
 101                         log(String.format(fmt,vars));\r
 102                 }\r
 103         };\r
 104         \r
 105         // A Convenient LogTarget to write to the Console\r
 106         public static final LogTarget SYSERR = new LogTarget() {\r
 107                 public void log(Object ... msgs) {\r
 108                         PrintStream out = System.err;\r
 109                         out.print(Chrono.dateFmt.format(new Date()));\r
 110                         out.print(": ");\r
 111                         for(Object str : msgs) {\r
 112                                 out.print(str.toString());\r
 113                                 out.print(' ');\r
 114                         }\r
 115                         out.println();\r
 116                         out.flush();\r
 117                 }\r
 118 \r
 119                 public void log(Throwable t, Object ... msgs) {\r
 120                         PrintStream out = System.err;\r
 121                         out.print(Chrono.dateFmt.format(new Date()));\r
 122                         out.print(": ");\r
 123                         for(Object str : msgs) {\r
 124                                 out.print(str.toString());\r
 125                                 out.print(' ');\r
 126                         }\r
 127                         out.println();\r
 128                         t.printStackTrace(out);\r
 129                 }\r
 130 \r
 131                 public boolean isLoggable() {\r
 132                         return true;\r
 133                 }\r
 134                 @Override\r
 135                 public void printf(String fmt, Object ... vars) {\r
 136                         log(String.format(fmt,vars));\r
 137                 }\r
 138 \r
 139         };\r
 140 \r
 141 \r
 142 };