Add a new Log implementation for JDK 1.4 (or later) logging.

Default behavior of LogSource.getInstance() is now:
* If Log4J is available, return an instance of Log4JCategoryLog
* If JDK 1.4 is available, return an instance of Jdk14Logger
* Otherwise, return an instance of NoOpLogger

As before, this default behavior can be overridden with a system
property, or by calling LogSource.setLogImplementation(), as described
in the package Javadocs.


git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/logging/trunk@138829 13f79535-47bb-0310-9956-ffa450edef68

build.xml

@@ -3,7 +3,7 @@
 
 <!--
         "Logging" component of the Jakarta Commons Subproject
-        $Id: build.xml,v 1.4 2002/01/05 00:34:46 craigmcc Exp $
+        $Id: build.xml,v 1.5 2002/01/05 22:40:40 craigmcc Exp $
 -->
 
 
@@ -129,12 +129,17 @@
 
   <target name="compile" depends="static"
    description="Compile shareable components">
+    <available property="jdk.1.4.present"
+              classname="java.util.logging.Logger"/>
+    <echo  message="jdk.1.4.present=${jdk.1.4.present}"/>
     <javac  srcdir="${source.home}"
            destdir="${build.home}/classes"
              debug="${compile.debug}"
        deprecation="${compile.deprecation}"
           optimize="${compile.optimize}">
       <classpath refid="compile.classpath"/>
+      <exclude name="org/apache/commons/logging/Jdk14Logger.java"
+             unless="jdk.1.4.present"/>
     </javac>
     <copy    todir="${build.home}/classes" filtering="on">
       <fileset dir="${source.home}" excludes="**/*.java"/>

src/java/org/apache/commons/logging/Jdk14Logger.java

@@ -0,0 +1,296 @@
+/*
+ * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//logging/src/java/org/apache/commons/logging/Attic/Jdk14Logger.java,v 1.1 2002/01/05 22:40:40 craigmcc Exp $
+ * $Revision: 1.1 $
+ * $Date: 2002/01/05 22:40:40 $
+ *
+ * ====================================================================
+ *
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 1999-2001 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution, if
+ *    any, must include the following acknowlegement:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowlegement may appear in the software itself,
+ *    if and wherever such third-party acknowlegements normally appear.
+ *
+ * 4. The names "The Jakarta Project", "Commons", and "Apache Software
+ *    Foundation" must not be used to endorse or promote products derived
+ *    from this software without prior written permission. For written
+ *    permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache"
+ *    nor may "Apache" appear in their names without prior written
+ *    permission of the Apache Group.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+
+
+package org.apache.commons.logging;
+
+
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+
+/**
+ * <p>Implementation of the <code>org.apache.commons.logging.Log</code>
+ * interfaces that wraps the standard JDK logging mechanisms that were
+ * introduced in the Merlin release (JDK 1.4).</p>
+ *
+ * @author Craig R. McClanahan
+ * @version $Revision: 1.1 $ $Date: 2002/01/05 22:40:40 $
+ */
+
+public class Jdk14Logger implements Log {
+
+
+    // ----------------------------------------------------------- Constructors
+
+
+    /**
+     * Construct a named instance of this Logger.
+     *
+     * @param name Name of the logger to be constructed
+     */
+    public Jdk14Logger(String name) {
+
+        logger = Logger.getLogger(name);
+        logger.setUseParentHandlers(true);
+        logger.setLevel(Level.INFO);
+
+    }
+
+
+    // ----------------------------------------------------- Instance Variables
+
+
+    /**
+     * The underlying Logger implementation we are using.
+     */
+    protected Logger logger = null;
+
+
+    // --------------------------------------------------------- Public Methods
+
+
+    /**
+     * Log a message with debug log level.
+     */
+    public void debug(Object message) {
+
+        logger.log(Level.FINEST, message.toString());
+
+    }
+
+
+    /**
+     * Log a message and exception with debug log level.
+     */
+    public void debug(Object message, Throwable exception) {
+
+        logger.log(Level.FINEST, message.toString(), exception);
+
+    }
+
+
+    /**
+     * Log a message with error log level.
+     */
+    public void error(Object message) {
+
+        logger.log(Level.SEVERE, message.toString());
+
+    }
+
+
+    /**
+     * Log a message and exception with error log level.
+     */
+    public void error(Object message, Throwable exception) {
+
+        logger.log(Level.SEVERE, message.toString(), exception);
+
+    }
+
+
+    /**
+     * Log a message with fatal log level.
+     */
+    public void fatal(Object message) {
+
+        logger.log(Level.SEVERE, message.toString());
+
+    }
+
+
+    /**
+     * Log a message and exception with fatal log level.
+     */
+    public void fatal(Object message, Throwable exception) {
+
+        logger.log(Level.SEVERE, message.toString(), exception);
+
+    }
+
+
+    /**
+     * Return the current logging level.
+     */
+    public int getLevel() {
+
+        Level level = logger.getLevel();
+        if (level == Level.ALL) {
+            return (ALL);
+        } else if (level == Level.SEVERE) {
+            return (ERROR);
+        } else if (level == Level.WARNING) {
+            return (WARN);
+        } else if (level == Level.INFO) {
+            return (INFO);
+        } else if (level == Level.CONFIG) {
+            return (DEBUG);
+        } else if (level == Level.FINE) {
+            return (DEBUG);
+        } else if (level == Level.FINER) {
+            return (DEBUG);
+        } else if (level == Level.FINEST) {
+            return (DEBUG);
+        } else {
+            return (OFF);
+        }
+
+    }
+
+
+    /**
+     * Return the native Logger instance we are using.
+     */
+    public Logger getLogger() {
+
+        return (this.logger);
+
+    }
+
+
+    /**
+     * Log a message with info log level.
+     */
+    public void info(Object message) {
+
+        logger.log(Level.INFO, message.toString());
+
+    }
+
+
+    /**
+     * Log a message and exception with info log level.
+     */
+    public void info(Object message, Throwable exception) {
+
+        logger.log(Level.INFO, message.toString(), exception);
+
+    }
+
+
+    /**
+     * Is debug logging currently enabled?
+     */
+    public boolean isDebugEnabled() {
+
+        return (logger.isLoggable(Level.FINEST));
+
+    }
+
+
+    /**
+     * Is info logging currently enabled?
+     */
+    public boolean isInfoEnabled() {
+
+        return (logger.isLoggable(Level.INFO));
+
+    }
+
+
+    /**
+     * Set the new logging level.
+     *
+     * @param level New logging level
+     */
+    public void setLevel(int level) {
+
+        if (level == OFF) {
+            logger.setLevel(Level.OFF);
+        } else if (level >= FATAL) {
+            logger.setLevel(Level.SEVERE);
+        } else if (level >= ERROR) {
+            logger.setLevel(Level.SEVERE);
+        } else if (level >= WARN) {
+            logger.setLevel(Level.WARNING);
+        } else if (level >= INFO) {
+            logger.setLevel(Level.INFO);
+        } else if (level >= DEBUG) {
+            logger.setLevel(Level.FINEST);
+        } else if (level >= ALL) {
+            logger.setLevel(Level.ALL);
+        }
+
+    }
+
+
+    /**
+     * Log a message with warn log level.
+     */
+    public void warn(Object message) {
+
+        logger.log(Level.WARNING, message.toString());
+
+    }
+
+
+    /**
+     * Log a message and exception with warn log level.
+     */
+    public void warn(Object message, Throwable exception) {
+
+        logger.log(Level.WARNING, message.toString(), exception);
+
+    }
+
+
+}

src/java/org/apache/commons/logging/LogSource.java

@@ -1,7 +1,7 @@
 /*
- * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//logging/src/java/org/apache/commons/logging/LogSource.java,v 1.6 2002/01/05 15:55:00 rdonkin Exp $
+ * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//logging/src/java/org/apache/commons/logging/LogSource.java,v 1.7 2002/01/05 22:40:40 craigmcc Exp $
- * $Revision: 1.6 $
+ * $Revision: 1.7 $
- * $Date: 2002/01/05 15:55:00 $
+ * $Date: 2002/01/05 22:40:40 $
  *
  * ====================================================================
  *
@@ -68,66 +68,123 @@ import java.lang.reflect.InvocationTargetException;
 
 /**
  * <p>Factory for creating {@link Log} instances.  Applications should call
- * the {@link #makeNewLogInstance} method to instantiate new instances
+ * the <code>makeNewLogInstance()</code> method to instantiate new instances
  * of the configured {@link Log} implementation class.</p>
  *
+ * <p>By default, calling <code>getInstance()</code> will use the following
+ * algorithm:</p>
+ * <ul>
+ * <li>If Log4J is available, return an instance of
+ *     <code>org.apache.commons.logging.Log4JCategoryLog</code>.</li>
+ * <li>If JDK 1.4 or later is available, return an instance of
+ *     <code>org.apache.commons.logging.Jdk14Logger</code>.</li>
+ * <li>Otherwise, return an instance of
+ *     <code>org.apache.commons.logging.NoOpLog</code>.</li>
+ * </ul>
+ *
+ * <p>You can change the default behavior in one of two ways:</p>
+ * <ul>
+ * <li>On the startup command line, set the system property
+ *     <code>org.apache.commons.logging.log</code> to the name of the
+ *     <code>org.apache.commons.logging.Log</code> implementation class
+ *     you want to use.</li>
+ * <li>At runtime, call <code>LogSource.setLogImplementation()</code>.</li>
+ * </ul>
+ *
  * @author Rod Waldhoff
- * @version $Id: LogSource.java,v 1.6 2002/01/05 15:55:00 rdonkin Exp $
+ * @version $Id: LogSource.java,v 1.7 2002/01/05 22:40:40 craigmcc Exp $
  */
 public class LogSource {
 
-    // --------------------------------------------------------- Class Attributes
+    // ------------------------------------------------------- Class Attributes
     
     static protected HashMap _logs = new HashMap();
+
     /** Is log4j available (in the current classpath) */
     static protected boolean _log4jIsAvailable = false;
 
+    /** Is JD 1.4 logging available */
+    static protected boolean _jdk14IsAvailable = false;
     
-    // --------------------------------------------------------- Class Initializers
+    /** Constructor for current log class */
+    static protected Constructor _logimplctor = null;
+
+
+    // ----------------------------------------------------- Class Initializers
     
     static {
+
+        // Is Log4J Available?
         try {
             if(null != Class.forName("org.apache.log4j.Category")) {
                 _log4jIsAvailable = true;
             } else {
                 _log4jIsAvailable = false;
             }
-        } catch(ClassNotFoundException e) {
+        } catch (Throwable t) {
             _log4jIsAvailable = false;
-        } catch(ExceptionInInitializerError e) {
-            _log4jIsAvailable = false;
-        } catch(LinkageError e) {
-            _log4jIsAvailable = false;
-        }
         }
 
-    /** Constructor for current log class */
+        // Is JDK 1.4 Logging Available?
-    static protected Constructor _logimplctor = null;
-    static {
         try {
-            setLogImplementation(
+            if(null != Class.forName("java.util.logging.Logger")) {
-                System.getProperty(
+                _jdk14IsAvailable = true;
-                    "org.apache.commons.logging.log","org.apache.commons.logging.NoOpLog"));
+            } else {
+                _jdk14IsAvailable = false;
+            }
+        } catch (Throwable t) {
+            _jdk14IsAvailable = false;
+        }
 
-        } catch(SecurityException e) {
+        // Set the default Log implementation
-            _logimplctor = null;
+        String name =
-        } catch(LinkageError e) {
+            System.getProperty("org.apache.commons.logging.log");
-            _logimplctor = null;
+        if (name != null) {
-        } catch(NoSuchMethodException e) {
+            try {
-            _logimplctor = null;
+                setLogImplementation(name);
-        } catch(ClassNotFoundException e) {
+            } catch (Throwable t) {
-            _logimplctor = null;
+                try {
+                    setLogImplementation
+                        ("org.apache.commons.logging.NoOpLog");
+                } catch (Throwable u) {
+                    ;
+                }
+            }
+        } else {
+            try {
+                if (_log4jIsAvailable) {
+                    setLogImplementation
+                        ("org.apache.commons.logging.Log4JCategoryLog");
+                } else if (_jdk14IsAvailable) {
+                    setLogImplementation
+                        ("org.apache.commons.logging.Jdk14Logger");
+                } else {
+                    setLogImplementation
+                        ("org.apache.commons.logging.NoOpLog");
+                }
+            } catch (Throwable t) {
+                try {
+                    setLogImplementation
+                        ("org.apache.commons.logging.NoOpLog");
+                } catch (Throwable u) {
+                    ;
+                }
             }
         }
 
+    }
+
+
+    // ------------------------------------------------------------ Constructor
     
-    // --------------------------------------------------------- Constructor
 
     /** Don't allow others to create instances */
     private LogSource() {
     }
 
-    // --------------------------------------------------------- Class Methods
+
+    // ---------------------------------------------------------- Class Methods
+
 
     /**
      * Set the log implementation/log implementation factory
@@ -140,11 +197,16 @@ public class LogSource {
                        LinkageError, ExceptionInInitializerError,
                        NoSuchMethodException, SecurityException,
                        ClassNotFoundException {
+        try {
             Class logclass = Class.forName(classname);
             Class[] argtypes = new Class[1];
             argtypes[0] = "".getClass();
             _logimplctor = logclass.getConstructor(argtypes);
+        } catch (Throwable t) {
+            _logimplctor = null;
         }
+    }
+
 
     /**
      * Set the log implementation/log implementation factory
@@ -171,11 +233,13 @@ public class LogSource {
         return log;
     }
 
+
     /** Get a <code>Log</code> instance by class */
     static public Log getInstance(Class clazz) {
         return getInstance(clazz.getName());
     }
 
+
     /**
      * Create a new {@link Log} implementation, based
      * on the given <i>name</i>
@@ -194,36 +258,27 @@ public class LogSource {
      * or when no corresponding class can be found,
      * this method will return a {@link Log4JCategoryLog}
      * if the log4j {@link org.apache.log4j.Category} class is
-     * available in the {@link LogSource}'s classpath, or
+     * available in the {@link LogSource}'s classpath, or a
-     * a {@link NoOpLog} if it is not.
+     * {@link Jdk14Logger} if we are on a JDK 1.4 or later system, or
+     * a {@link NoOpLog} if neither of the above conditions is true.
      *
      * @param name the log name (or category)
      */
     static public Log makeNewLogInstance(String name) {
+
         Log log = null;
         try {
             Object[] args = new Object[1];
             args[0] = name;
             log = (Log)(_logimplctor.newInstance(args));
-        } catch (InstantiationException e) {
+        } catch (Throwable t) {
-            log = null;
-        } catch (IllegalAccessException e) {
-            log = null;
-        } catch (IllegalArgumentException e) {
-            log = null;
-        } catch (InvocationTargetException e) {
-            log = null;
-        } catch (NullPointerException e) {
             log = null;
         }
         if(null == log) {
-            if(_log4jIsAvailable) {
-                return new Log4JCategoryLog(name);
-            } else {
             log = new NoOpLog(name);
         }
-        }
         return log;
+
     }
 
     /**

src/java/org/apache/commons/logging/package.html

@@ -10,12 +10,10 @@ prebuilt support for the following:</p>
 <li><a href="http://jakarta.apache.org/log4j/">Log4J</a> from Apache's
     Jakarta project.  Each named <a href="Log.html">Log</a> instance is
     connected to a corresponding Log4J Category.</li>
-<!--
 <li><a href="http://java.sun.com/j2se/1.4/docs/guide/util/logging/index.html">
     JDK Logging API</a>, included in JDK 1.4 or later systems.  Each named
     <a href="Log.html">Log</a> instance is connected to a corresponding
     <code>java.util.logging.Logger</code> instance.</li>
--->
 <li><a href="NoOpLog.html">NoOpLog</a> implementation that simply swallows
     all log output, for all named <a href="Log.html">Log</a> isntances.</li>
 <li><a href="SimpleLog.html">SimpleLog</a> implementation that writes all
@@ -41,11 +39,9 @@ following algorithm is applied:</p>
 <li>If Log4J is available, return an instance of
     <a href="Log4JCategoryLog.html">Log4JCategoryLog</a> that wraps a
     Log4J Category instance of the specified name.</li>
-<!--
 <li>If the JDK 1.4 logging APIs are available, return an instance
-    of <a href="JdkLogger.html">JdkLogger</a> that wraps an instance of
+    of <a href="Jdk14Logger.html">Jdk14Logger</a> that wraps an instance of
     <code>java.util.logging.Logger</code> for the specified name.</li>
--->
 <li>Return an instance of <a href="NoOpLog.html">NoOpLog</a> that
     throws away all logged output.</li>
 </ul>
@@ -68,8 +64,8 @@ component, consists of the following steps:</p>
 <li>Acquire a reference to an instance of
     <a href="Log.html">org.apache.commons.logging.Log</a>, by calling the
     factory method
-    <a href="LogSource.html#makeNewLogInstance(java.lang.String)">
+    <a href="LogSource.html#getInstance(java.lang.String)">
-    LogSource.makeNewLogInstance()</a>.  Your application can contain
+    LogSource.getInstance(String name)</a>.  Your application can contain
     references to multiple loggers that are used for different
     purposes.  A typical scenario for a server application is to have each
     major component of the server use its own Log instance.</li>
@@ -91,7 +87,7 @@ import org.apache.commons.logging.LogSource;
 
 public class MyComponent {
 
-  protected Log log = LogSource.makeNewInstance("mycomponent");
+  protected Log log = LogSource.getInstance("my.component");
 
   // Called once at startup time
   public void start() {