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commit 5689c0d671d0d30fef71e851848ad041a90aa015
Author: Gary Gregory <garydgreg...@gmail.com>
AuthorDate: Sun Jun 16 08:56:01 2024 -0400
Refactor example duplicate code
- Add example class PrintCommandListeners
- Reduce compiler warnings
- Reduce SpotBugs warnings
---
.../net/examples/PrintCommandListeners.java | 33 ++++++++++++++++++++++
.../commons/net/examples/ftp/FTPClientExample.java | 8 ++----
.../net/examples/ftp/ServerToServerFTP.java | 8 ++----
.../apache/commons/net/examples/mail/POP3Mail.java | 5 ++--
.../apache/commons/net/examples/mail/SMTPMail.java | 4 +--
.../commons/net/examples/nntp/ArticleReader.java | 8 ++----
.../commons/net/examples/nntp/ExtendedNNTPOps.java | 5 ++--
.../net/examples/nntp/MessageThreading.java | 5 ++--
.../commons/net/examples/nntp/PostMessage.java | 4 +--
9 files changed, 49 insertions(+), 31 deletions(-)
diff --git
a/src/main/java/org/apache/commons/net/examples/PrintCommandListeners.java
b/src/main/java/org/apache/commons/net/examples/PrintCommandListeners.java
new file mode 100644
index 00000000..417a787d
--- /dev/null
+++ b/src/main/java/org/apache/commons/net/examples/PrintCommandListeners.java
@@ -0,0 +1,33 @@
+/*
+ * 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
+ *
+ * http://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.commons.net.examples;
+
+import org.apache.commons.net.PrintCommandListener;
+import org.apache.commons.net.io.Util;
+
+/**
+ * Factory of {@link PrintCommandListener} for examples.
+ */
+public class PrintCommandListeners {
+
+ @SuppressWarnings("resource") // No need to close writer on System.out.
+ public static PrintCommandListener sysOutPrintCommandListener() {
+ return new PrintCommandListener(Util.newPrintWriter(System.out), true);
+ }
+
+}
diff --git
a/src/main/java/org/apache/commons/net/examples/ftp/FTPClientExample.java
b/src/main/java/org/apache/commons/net/examples/ftp/FTPClientExample.java
index 580312d6..5aa8189e 100644
--- a/src/main/java/org/apache/commons/net/examples/ftp/FTPClientExample.java
+++ b/src/main/java/org/apache/commons/net/examples/ftp/FTPClientExample.java
@@ -22,13 +22,12 @@ import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
-import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.time.Duration;
import java.util.Arrays;
-import org.apache.commons.net.PrintCommandListener;
+import org.apache.commons.net.examples.PrintCommandListeners;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPClientConfig;
@@ -39,7 +38,6 @@ import org.apache.commons.net.ftp.FTPReply;
import org.apache.commons.net.ftp.FTPSClient;
import org.apache.commons.net.io.CopyStreamEvent;
import org.apache.commons.net.io.CopyStreamListener;
-import org.apache.commons.net.io.Util;
import org.apache.commons.net.util.TrustManagerUtils;
/**
@@ -281,9 +279,7 @@ public final class FTPClientExample {
ftp.setListHiddenFiles(hidden);
// suppress login details
- @SuppressWarnings("resource")
- final PrintWriter printWriter = Util.newPrintWriter(System.out);
- ftp.addProtocolCommandListener(new PrintCommandListener(printWriter,
true));
+
ftp.addProtocolCommandListener(PrintCommandListeners.sysOutPrintCommandListener());
final FTPClientConfig config;
if (serverType != null) {
diff --git
a/src/main/java/org/apache/commons/net/examples/ftp/ServerToServerFTP.java
b/src/main/java/org/apache/commons/net/examples/ftp/ServerToServerFTP.java
index d8d8b46b..f49c9a38 100644
--- a/src/main/java/org/apache/commons/net/examples/ftp/ServerToServerFTP.java
+++ b/src/main/java/org/apache/commons/net/examples/ftp/ServerToServerFTP.java
@@ -18,14 +18,12 @@
package org.apache.commons.net.examples.ftp;
import java.io.IOException;
-import java.io.PrintWriter;
import java.net.InetAddress;
-import org.apache.commons.net.PrintCommandListener;
import org.apache.commons.net.ProtocolCommandListener;
+import org.apache.commons.net.examples.PrintCommandListeners;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;
-import org.apache.commons.net.io.Util;
/**
* This is an example program demonstrating how to use the FTPClient class.
This program arranges a server to server file transfer that transfers a file
from
@@ -75,9 +73,7 @@ public final class ServerToServerFTP {
password2 = args[6];
file2 = args[7];
- @SuppressWarnings("resource") // Don't close System.out
- final PrintWriter printWriter = Util.newPrintWriter(System.out);
- listener = new PrintCommandListener(printWriter, true);
+ listener = PrintCommandListeners.sysOutPrintCommandListener();
ftp1 = new FTPClient();
ftp1.addProtocolCommandListener(listener);
ftp2 = new FTPClient();
diff --git a/src/main/java/org/apache/commons/net/examples/mail/POP3Mail.java
b/src/main/java/org/apache/commons/net/examples/mail/POP3Mail.java
index 25075228..d3c68b7f 100644
--- a/src/main/java/org/apache/commons/net/examples/mail/POP3Mail.java
+++ b/src/main/java/org/apache/commons/net/examples/mail/POP3Mail.java
@@ -21,8 +21,7 @@ import java.io.BufferedReader;
import java.io.IOException;
import java.util.Locale;
-import org.apache.commons.net.PrintCommandListener;
-import org.apache.commons.net.io.Util;
+import org.apache.commons.net.examples.PrintCommandListeners;
import org.apache.commons.net.pop3.POP3Client;
import org.apache.commons.net.pop3.POP3MessageInfo;
import org.apache.commons.net.pop3.POP3SClient;
@@ -77,7 +76,7 @@ public final class POP3Mail {
pop3.setDefaultTimeout(60000);
// suppress login details
- pop3.addProtocolCommandListener(new
PrintCommandListener(Util.newPrintWriter(System.out), true));
+
pop3.addProtocolCommandListener(PrintCommandListeners.sysOutPrintCommandListener());
try {
pop3.connect(server);
diff --git a/src/main/java/org/apache/commons/net/examples/mail/SMTPMail.java
b/src/main/java/org/apache/commons/net/examples/mail/SMTPMail.java
index 3c699a99..d8c61e38 100644
--- a/src/main/java/org/apache/commons/net/examples/mail/SMTPMail.java
+++ b/src/main/java/org/apache/commons/net/examples/mail/SMTPMail.java
@@ -28,7 +28,7 @@ import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
-import org.apache.commons.net.PrintCommandListener;
+import org.apache.commons.net.examples.PrintCommandListeners;
import org.apache.commons.net.io.Util;
import org.apache.commons.net.smtp.SMTPClient;
import org.apache.commons.net.smtp.SMTPReply;
@@ -108,7 +108,7 @@ public final class SMTPMail {
}
client = new SMTPClient();
- client.addProtocolCommandListener(new
PrintCommandListener(Util.newPrintWriter(System.out), true));
+
client.addProtocolCommandListener(PrintCommandListeners.sysOutPrintCommandListener());
client.connect(server);
diff --git
a/src/main/java/org/apache/commons/net/examples/nntp/ArticleReader.java
b/src/main/java/org/apache/commons/net/examples/nntp/ArticleReader.java
index 736ccc4f..4aa3a8bf 100644
--- a/src/main/java/org/apache/commons/net/examples/nntp/ArticleReader.java
+++ b/src/main/java/org/apache/commons/net/examples/nntp/ArticleReader.java
@@ -19,11 +19,9 @@ package org.apache.commons.net.examples.nntp;
import java.io.BufferedReader;
import java.io.IOException;
-import java.io.PrintWriter;
import java.net.SocketException;
-import org.apache.commons.net.PrintCommandListener;
-import org.apache.commons.net.io.Util;
+import org.apache.commons.net.examples.PrintCommandListeners;
import org.apache.commons.net.nntp.NNTPClient;
import org.apache.commons.net.nntp.NewsgroupInfo;
@@ -45,9 +43,7 @@ public class ArticleReader {
final String articleSpec = args.length >= 3 ? args[2] : null;
final NNTPClient client = new NNTPClient();
- @SuppressWarnings("resource")
- final PrintWriter printWriter = Util.newPrintWriter(System.out);
- client.addProtocolCommandListener(new
PrintCommandListener(printWriter, true));
+
client.addProtocolCommandListener(PrintCommandListeners.sysOutPrintCommandListener());
client.connect(hostname);
if (args.length == 5) { // Optional auth
diff --git
a/src/main/java/org/apache/commons/net/examples/nntp/ExtendedNNTPOps.java
b/src/main/java/org/apache/commons/net/examples/nntp/ExtendedNNTPOps.java
index 94523dbd..8e7e3b28 100644
--- a/src/main/java/org/apache/commons/net/examples/nntp/ExtendedNNTPOps.java
+++ b/src/main/java/org/apache/commons/net/examples/nntp/ExtendedNNTPOps.java
@@ -19,8 +19,7 @@ package org.apache.commons.net.examples.nntp;
import java.io.IOException;
-import org.apache.commons.net.PrintCommandListener;
-import org.apache.commons.net.io.Util;
+import org.apache.commons.net.examples.PrintCommandListeners;
import org.apache.commons.net.nntp.Article;
import org.apache.commons.net.nntp.NNTPClient;
import org.apache.commons.net.nntp.NewsgroupInfo;
@@ -47,7 +46,7 @@ public class ExtendedNNTPOps {
public ExtendedNNTPOps() {
client = new NNTPClient();
- client.addProtocolCommandListener(new
PrintCommandListener(Util.newPrintWriter(System.out), true));
+
client.addProtocolCommandListener(PrintCommandListeners.sysOutPrintCommandListener());
}
private void demo(final String host, final String user, final String
password) {
diff --git
a/src/main/java/org/apache/commons/net/examples/nntp/MessageThreading.java
b/src/main/java/org/apache/commons/net/examples/nntp/MessageThreading.java
index 7711f69c..b27242d3 100644
--- a/src/main/java/org/apache/commons/net/examples/nntp/MessageThreading.java
+++ b/src/main/java/org/apache/commons/net/examples/nntp/MessageThreading.java
@@ -20,8 +20,7 @@ package org.apache.commons.net.examples.nntp;
import java.io.IOException;
import java.net.SocketException;
-import org.apache.commons.net.PrintCommandListener;
-import org.apache.commons.net.io.Util;
+import org.apache.commons.net.examples.PrintCommandListeners;
import org.apache.commons.net.nntp.Article;
import org.apache.commons.net.nntp.NNTPClient;
import org.apache.commons.net.nntp.NewsgroupInfo;
@@ -42,7 +41,7 @@ public class MessageThreading {
final String newsgroup = args[1];
final NNTPClient client = new NNTPClient();
- client.addProtocolCommandListener(new
PrintCommandListener(Util.newPrintWriter(System.out), true));
+
client.addProtocolCommandListener(PrintCommandListeners.sysOutPrintCommandListener());
client.connect(hostname);
if (args.length == 4) { // Optional auth
diff --git
a/src/main/java/org/apache/commons/net/examples/nntp/PostMessage.java
b/src/main/java/org/apache/commons/net/examples/nntp/PostMessage.java
index 38e3cda1..b2144e1b 100644
--- a/src/main/java/org/apache/commons/net/examples/nntp/PostMessage.java
+++ b/src/main/java/org/apache/commons/net/examples/nntp/PostMessage.java
@@ -27,7 +27,7 @@ import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Paths;
-import org.apache.commons.net.PrintCommandListener;
+import org.apache.commons.net.examples.PrintCommandListeners;
import org.apache.commons.net.io.Util;
import org.apache.commons.net.nntp.NNTPClient;
import org.apache.commons.net.nntp.NNTPReply;
@@ -132,7 +132,7 @@ public final class PostMessage {
}
client = new NNTPClient();
- client.addProtocolCommandListener(new
PrintCommandListener(Util.newPrintWriter(System.out), true));
+
client.addProtocolCommandListener(PrintCommandListeners.sysOutPrintCommandListener());
client.connect(server);
