Clarify logging

src/main/org/apache/tools/ant/DefaultLogger.java

@@ -36,7 +36,7 @@
  * any messages that get logged.
  *
  */
-public class DefaultLogger implements BuildLogger {
+public class DefaultLogger implements BuildLogger, Logger {
     /**
      * Size of left-hand column for right-justified task name.
      * @see #messageLogged(BuildEvent)
@@ -326,7 +326,7 @@ protected void printMessage(final String message,
      *
      * @param message Message being logged. Should not be <code>null</code>.
      */
-    protected void log(String message) {
+    public void log(String message) {
     }
 
     /**

src/main/org/apache/tools/ant/Logger.java

@@ -0,0 +1,30 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You under the Apache License, Version 2.0
+ *  (the "License"); you may not use this file except in compliance with
+ *  the License.  You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ */
+package org.apache.tools.ant;
+
+/**
+ * A generic logger interface.
+ */
+public interface Logger {
+    /**
+     * Log a message.
+     *
+     * @param message String to be logged
+     */
+    void log(String message);
+}

src/main/org/apache/tools/ant/Project.java

@@ -62,7 +62,7 @@
  * file paths at runtime.
  *
  */
-public class Project implements ResourceFactory {
+public class Project implements ResourceFactory, Logger {
     /** Message priority of "error". */
     public static final int MSG_ERR = 0;
     /** Message priority of "warning". */

src/main/org/apache/tools/ant/ProjectComponent.java

@@ -22,7 +22,7 @@
  * Provides common facilities.
  *
  */
-public abstract class ProjectComponent implements Cloneable {
+public abstract class ProjectComponent implements Cloneable, Logger {
 
     // CheckStyle:VisibilityModifier OFF - bc
     /**

src/main/org/apache/tools/ant/Task.java

@@ -270,15 +270,6 @@ protected void handleErrorFlush(String output) {
         handleErrorOutput(output);
     }
 
-    /**
-     * Logs a message with the default (INFO) priority.
-     *
-     * @param msg The message to be logged. Should not be <code>null</code>.
-     */
-    public void log(String msg) {
-        log(msg, Project.MSG_INFO);
-    }
-
     /**
      * Logs a message with the given priority. This delegates
      * the actual logging to the project.
@@ -287,6 +278,7 @@ public void log(String msg) {
      * @param msgLevel The message priority at which this message is to
      *                 be logged.
      */
+    @Override
     public void log(String msg, int msgLevel) {
         if (getProject() == null) {
             super.log(msg, msgLevel);

src/main/org/apache/tools/ant/listener/MailLogger.java

@@ -307,7 +307,7 @@ public Values starttls(boolean starttls) {
      * @param message the message being logger
      */
     @Override
-    protected void log(String message) {
+    public void log(String message) {
         buffer.append(message).append(System.lineSeparator());
     }
 

src/main/org/apache/tools/ant/taskdefs/XSLTLogger.java

@@ -21,7 +21,9 @@
 /**
  * Interface to log messages for XSLT
  * @since Ant 1.5
+ * @deprecated replaced by Logger
  */
+@Deprecated
 public interface XSLTLogger {
     /**
      * Log a message.

src/main/org/apache/tools/ant/taskdefs/optional/TraXLiaison.java

@@ -50,6 +50,7 @@
 import javax.xml.transform.stream.StreamSource;
 
 import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.Logger;
 import org.apache.tools.ant.Project;
 import org.apache.tools.ant.taskdefs.XSLTLiaison4;
 import org.apache.tools.ant.taskdefs.XSLTLogger;
@@ -100,7 +101,7 @@ public class TraXLiaison implements XSLTLiaison4, ErrorListener, XSLTLoggerAware
     /** stylesheet to use for transformation */
     private Resource stylesheet;
 
-    private XSLTLogger logger;
+    private Logger logger;
 
     /** possible resolver for publicIds */
     private EntityResolver entityResolver;
@@ -514,10 +515,20 @@ public void addParam(final String name, final Object value) {
      * Set a logger.
      * @param l a logger.
      */
-    public void setLogger(final XSLTLogger l) {
+    public void setLogger(final Logger l) {
         logger = l;
     }
 
+    /**
+     * Set a logger.
+     * @param l a logger.
+     * @deprecated XSLTLogger replaced by Logger
+     */
+    @Deprecated
+    public void setLogger(final XSLTLogger l) {
+        logger = (Logger) l;
+    }
+
     /**
      * Log an error.
      * @param e the exception to log.

src/tests/junit/org/apache/tools/ant/taskdefs/EchoTest.java

@@ -97,7 +97,8 @@ public EchoTestLogger() {
         /**
          * {@inheritDoc}
          */
-        protected void log(String message) {
+        @Override
+        public void log(String message) {
             this.lastLoggedMessage = message;
         }
 

src/tests/junit/org/apache/tools/ant/taskdefs/compilers/DefaultCompilerAdapterTest.java

@@ -50,6 +50,7 @@ public class DefaultCompilerAdapterTest {
 
     private static class LogCapturingJavac extends Javac {
         private StringBuilder sb = new StringBuilder();
+        @Override
         public void log(String msg, int msgLevel) {
             sb.append(msg);
         }

src/tests/junit/org/apache/tools/ant/taskdefs/optional/RpmTest.java

@@ -63,6 +63,7 @@ public int execute() {
                 };
         }
 
+        @Override
         public void log(String msg, int msgLevel) {
         }
     }

src/tests/junit/org/apache/tools/ant/taskdefs/optional/TraXLiaisonTest.java

@@ -33,16 +33,16 @@
 import javax.xml.transform.TransformerFactoryConfigurationError;
 
 import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.Logger;
 import org.apache.tools.ant.taskdefs.XSLTLiaison;
-import org.apache.tools.ant.taskdefs.XSLTLogger;
 import org.apache.tools.ant.util.JAXPUtils;
 import org.junit.After;
 import org.junit.Test;
 
 /**
  * TraX XSLTLiaison testcase
  */
-public class TraXLiaisonTest extends AbstractXSLTLiaisonTest implements XSLTLogger {
+public class TraXLiaisonTest extends AbstractXSLTLiaisonTest implements Logger {
 
     @After
     public void tearDown() {