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+/*
+ * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//logging/src/java/org/apache/commons/logging/Attic/AbstractLog.java,v 1.1 2002/01/03 18:52:25 rdonkin Exp $
+ * $Revision: 1.1 $
+ * $Date: 2002/01/03 18:52:25 $
+ *
+ * ====================================================================
+ *
+ * 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;
+
+
+/**
+  * <p> This is an abstract implementation of the <code>Log</code> interface.
+  * It provides the following common services for the actual concrete implementations:
+  * 
+  * <h4> Log Level Property </h4> 
+  * <p> Property getter and setter for log levels. </p>
+  * 
+  * <h4> Log Level Enforcement</h4>
+  * <p> The current log level is checked and then the message will be passed onto the
+  * subclass implementation if the level is currently enabled. </p>
+  *
+  * @author Robert Burrell Donkin
+  * @version $Revision: 1.1 $
+ */
+public abstract class AbstractLog implements Log {
+
+    // --------------------------------------------------------- Attributes
+    
+    /** Default log level is currently <code>OFF</code> */
+    private int currentLogLevel = Log.OFF;
+
+
+    // --------------------------------------------------------- Properties
+
+    /**
+     * <p> Set logging level. </p> 
+     *
+     * @param level new logging level
+     */
+    public void setLevel(int currentLogLevel) {
+    
+        this.currentLogLevel = currentLogLevel;
+    }
+    
+    /**
+     * <p> Get logging level. </p> 
+     */
+    public int getLevel() {
+    
+        return currentLogLevel;
+    }
+    
+    /**
+     * <p> Are debug messages currently enabled? </p>
+     *
+     * <p> This allows expensive operations such as <code>String</code> concatination
+     * to be avoided when the message will be ignored by the logger. </p>
+     *
+     * <p> This implementation checks that the log level is debug or lower.
+     * If it is, then it passes the request onto {@link #isDebugEnabledImpl}.
+     */
+    public final boolean isDebugEnabled() {
+    
+        if (isLevelEnabled(Log.DEBUG)) {
+            return isDebugEnabledImpl();
+        }
+        
+        return false;
+    }
+    
+    /**
+     * <p> Are info messages currently enabled? </p>
+     *
+     * <p> This allows expensive operations such as <code>String</code> concatination
+     * to be avoided when the message will be ignored by the logger. </p>
+     *
+     * <p> This implementation checks that the log level is debug or lower.
+     * If it is, then it passes the request onto {@link #isInfoEnabledImpl}.
+     */
+    public final boolean isInfoEnabled() {
+    
+        if (isLevelEnabled(Log.INFO)) {
+            return isInfoEnabledImpl();
+        }
+        
+        return false;
+    }  
+
+    
+    // --------------------------------------------------------- Logging Methods
+
+    /**
+     * <p> Log a message with debug log level.</p> 
+     *
+     * <p> If debug log level is enabled, 
+     * then {@link #debugImpl(Object message)} is called. </p>
+     */
+    public final void debug(Object message) {
+    
+        if (isLevelEnabled(Log.DEBUG)) {
+            debugImpl(message);
+        }
+    }
+    
+    /**
+     * <p> Log an error with debug log level.</p> 
+     *
+     * <p> If debug log level is enabled, 
+     * then {@link #debugImpl(Object message, Throwable t)} is called. </p>
+     */    
+    public final void debug(Object message, Throwable t) {
+    
+        if (isLevelEnabled(Log.DEBUG)) {
+            debugImpl(message, t);
+        }
+    }
+
+    /**
+     * <p> Log a message with info log level.</p> 
+     *
+     * <p> If info log level is enabled, 
+     * then {@link #infoImpl(Object message)} is called. </p>
+     */    
+    public final void info(Object message) {
+    
+        if (isLevelEnabled(Log.INFO)) {
+            infoImpl(message);
+        }
+    }
+    
+    /**
+     * <p> Log an error with info log level.</p> 
+     *
+     * <p> If info log level is enabled, 
+     * then {@link #infoImpl(Object message, Throwable t)} is called. </p>
+     */
+    public final void info(Object message, Throwable t) {
+    
+        if (isLevelEnabled(Log.INFO)) {
+            infoImpl(message, t);
+        }
+    }
+    
+    /**
+     * <p> Log a message with warn log level.</p> 
+     *
+     * <p> If warn log level is enabled, 
+     * then {@link #warnImpl(Object message)} is called. </p>
+     */
+    public final void warn(Object message) {
+    
+        if (isLevelEnabled(Log.WARN)) {
+            warnImpl(message);
+        }
+    }
+
+    /**
+     * <p> Log an error with warn log level.</p> 
+     *
+     * <p> If warn log level is enabled, 
+     * then {@link #warnImpl(Object message, Throwable t)} is called. </p>
+     */
+    public final void warn(Object message, Throwable t) {
+    
+        if (isLevelEnabled(Log.WARN)) {
+            warnImpl(message, t);
+        }
+    }
+    
+    /**
+     * <p> Log a message with error log level.</p> 
+     *
+     * <p> If error log level is enabled, 
+     * then {@link #errorImpl(Object message)} is called. </p>
+     */
+    public final void error(Object message) {
+    
+        if (isLevelEnabled(Log.ERROR)) {
+            errorImpl(message);
+        }
+    }
+    
+    /**
+     * <p> Log an error with error log level.</p> 
+     *
+     * <p> If error log level is enabled, 
+     * then {@link #errorImpl(Object message, Throwable t)} is called. </p>
+     */
+    public final void error(Object message, Throwable t) {
+    
+        if (isLevelEnabled(Log.ERROR)) {
+            errorImpl(message, t);
+        }
+    }
+    
+    /**
+     * <p> Log a message with fatal log level.</p> 
+     *
+     * <p> If fatal log level is enabled, 
+     * then {@link #fatalImpl(Object message)} is called. </p>
+     */
+    public final void fatal(Object message) {
+    
+        if (isLevelEnabled(Log.FATAL)) {
+            fatalImpl(message);
+        }
+    }
+
+    /**
+     * <p> Log an error with fatal log level.</p> 
+     *
+     * <p> If fatal log level is enabled, 
+     * then {@link #fatalImpl(Object message, Throwable t)} is called. </p>
+     */    
+    public final void fatal(Object message, Throwable t) {
+    
+        if (isLevelEnabled(Log.FATAL)) {
+            fatalImpl(message, t);
+        }
+    }
+  
+    
+    
+    // --------------------------------------------------------- Decorated Implementation
+ 
+    /**
+     * <p> [OVERRIDE] Log a message with debug log level. 
+     * Subclasses should override this method to implement the logging.</p> 
+     */
+    protected abstract void debugImpl(Object message);
+    
+    /**
+     * <p> [OVERRIDE] Log an error with debug log level.
+     * Subclasses should override this method to implement the logging. </p> 
+     */
+    protected abstract void debugImpl(Object message, Throwable t);
+    
+        
+    /**
+     * <p> [OVERRIDE] Log a message with info log level .
+     * Subclasses should override this method to implement the logging.</p> 
+     */
+    protected abstract void infoImpl(Object message);
+
+    /**
+     * <p> [OVERRIDE] Log an error with info log level.
+     * Subclasses should override this method to implement the logging.</p> 
+     */
+    protected abstract void infoImpl(Object message, Throwable t);
+    
+    
+    /**
+     * <p> [OVERRIDE] Log a message with warn log level.
+     * Subclasses should override this method to implement the logging.</p> 
+     */
+    protected abstract void warnImpl(Object message);
+
+    /**
+     * <p> [OVERRIDE] Log an error with warn log level.
+     * Subclasses should override this method to implement the logging.</p> 
+     */
+    protected abstract void warnImpl(Object message, Throwable t);
+    
+    
+    /**
+     * <p> [OVERRIDE] Log a message with error log level.
+     * Subclasses should override this method to implement the logging.</p> 
+     */
+    protected abstract void errorImpl(Object message);
+    
+    /**
+     * <p> [OVERRIDE] Log an error with error log level.
+     * Subclasses should override this method to implement the logging.</p> 
+     */
+    protected abstract void errorImpl(Object message, Throwable t);
+    
+    
+    /**
+     * <p> [OVERRIDE] Log a message with fatal log level.
+     * Subclasses should override this method to implement the logging.</p> 
+     */
+    protected abstract void fatalImpl(Object message);
+
+
+    /**
+     * <p> [OVERRIDE] Log an error with fatal log level.
+     * Subclasses should override this method to implement the logging.</p> 
+     */
+    protected abstract void fatalImpl(Object message, Throwable t);
+    
+    /**
+     * <p> Are debug messages currently enabled? </p>
+     *
+     * <p> Subclasses should override this method if their logger provides 
+     * a special implementation. </p>
+     *
+     * @return true
+     */
+    protected boolean isDebugEnabledImpl() {
+        return true;
+    }
+
+    /**
+     * <p> Are info messages currently enabled? </p>
+     *
+     * <p> Subclasses should override this method if their logger provides 
+     * a special implementation. </p>
+     *
+     * @return true
+     */
+    protected boolean isInfoEnabledImpl() {
+        return true;
+    }
+
+    
+    
+    // --------------------------------------------------------- Implementation Methods
+
+    /**
+     * Is the given log level currently enabled?
+     *
+     * @param logLevel is this level enabled?
+     */
+    protected boolean isLevelEnabled(int logLevel) {
+        // log level are numerically ordered so can use simple numeric comparison
+        return (logLevel >= currentLogLevel);
+    }
+}