From: Janus Varmarken <varmarken@gmail.com>
Date: Sat, 19 Jan 2019 09:13:14 +0000 (-0800)
Subject: Add utility for printing to a file and to std out simultaneously
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=44526223045400a3ac2e14d92ac76ab2f3dfcd67;p=pingpong.git

Add utility for printing to a file and to std out simultaneously
---

diff --git a/Code/Projects/SmartPlugDetector/src/main/java/edu/uci/iotproject/io/PrintWriterUtils.java b/Code/Projects/SmartPlugDetector/src/main/java/edu/uci/iotproject/io/PrintWriterUtils.java
new file mode 100644
index 0000000..167993d
--- /dev/null
+++ b/Code/Projects/SmartPlugDetector/src/main/java/edu/uci/iotproject/io/PrintWriterUtils.java
@@ -0,0 +1,43 @@
+package edu.uci.iotproject.io;
+
+import java.io.PrintWriter;
+
+/**
+ * Utility methods for (jointly) printing to a {@link PrintWriter} (and standard output).
+ *
+ * @author Janus Varmarken {@literal <jvarmark@uci.edu>}
+ * @author Rahmadi Trimananda {@literal <rtrimana@uci.edu>}
+ */
+public final class PrintWriterUtils {
+
+    private PrintWriterUtils() {
+        // Disallow instantiation. Static-only class.
+    }
+
+    /**
+     * Invoke {@link PrintWriter#println(Object)} passing {@code line} as argument while also printing {@code line} to
+     * standard output if {@code duplicateToStdOut} is {@code true}.
+     * @param line The line to be printed.
+     * @param writer The {@link PrintWriter} that is to print {@code line}.
+     * @param duplicateToStdOut Set to {@code true} if {@code line} should also be printed in standard output.
+     */
+    public static void println(Object line, PrintWriter writer, boolean duplicateToStdOut) {
+        if (duplicateToStdOut) {
+            System.out.println(line);
+        }
+        writer.println(line);
+    }
+
+    /**
+     * Make writer (and standard output, if {@code duplicateToStdOut} is {@code true}) print an empty line.
+     * @param writer The writer that {@link PrintWriter#println()} is to be invoked on.
+     * @param duplicateToStdOut If {@code true}, prints an empty line to standard output.
+     */
+    public static void printEmptyLine(PrintWriter writer, boolean duplicateToStdOut) {
+        if (duplicateToStdOut) {
+            System.out.println();
+        }
+        writer.println();
+    }
+
+}