Polish AbstractResource

See gh-23813

spring-core/src/main/java/org/springframework/core/io/AbstractResource.java

@@ -25,6 +25,7 @@ import java.net.URISyntaxException;
 import java.net.URL;
 import java.nio.channels.Channels;
 import java.nio.channels.ReadableByteChannel;
+import java.util.function.Supplier;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -60,10 +61,7 @@ public abstract class AbstractResource implements Resource {
 				return getFile().exists();
 			}
 			catch (IOException ex) {
-				Log logger = LogFactory.getLog(getClass());
-				if (logger.isDebugEnabled()) {
-					logger.debug("Could not retrieve File for existence check of " + getDescription(), ex);
-				}
+				debug(() -> "Could not retrieve File for existence check of " + getDescription(), ex);
 			}
 		}
 		// Fall back to stream existence: can we open the stream?
@@ -72,14 +70,18 @@ public abstract class AbstractResource implements Resource {
 			return true;
 		}
 		catch (Throwable ex) {
-			Log logger = LogFactory.getLog(getClass());
-			if (logger.isDebugEnabled()) {
-				logger.debug("Could not retrieve InputStream for existence check of " + getDescription(), ex);
-			}
+			debug(() -> "Could not retrieve InputStream for existence check of " + getDescription(), ex);
 			return false;
 		}
 	}
 
+	private void debug(Supplier<String> message, Throwable ex) {
+		Log logger = LogFactory.getLog(getClass());
+		if (logger.isDebugEnabled()) {
+			logger.debug(message.get(), ex);
+		}
+	}
+
 	/**
 	 * This implementation always returns {@code true} for a resource
 	 * that {@link #exists() exists} (revised as of 5.1).
@@ -174,10 +176,7 @@ public abstract class AbstractResource implements Resource {
 				is.close();
 			}
 			catch (IOException ex) {
-				Log logger = LogFactory.getLog(getClass());
-				if (logger.isDebugEnabled()) {
-					logger.debug("Could not close content-length InputStream for " + getDescription(), ex);
-				}
+				debug(() -> "Could not close content-length InputStream for " + getDescription(), ex);
 			}
 		}
 	}