Added Profiler class

src/main/java/fr/xephi/authme/util/Profiler.java

@@ -0,0 +1,132 @@
+package fr.xephi.authme.util;
+
+import java.text.DecimalFormat;
+
+@SuppressWarnings("UnusedDeclaration")
+public class Profiler {
+
+    /** Defines the past time in milliseconds. */
+    private long time = 0;
+    /** Defines the time in milliseconds the profiler last started at. */
+    private long start = -1;
+
+    /**
+     * Constructor. This won't start the profiler immediately.
+     */
+    public Profiler() {
+        this(false);
+    }
+
+    /**
+     * Constructor.
+     *
+     * @param start True to immediately start the profiler.
+     */
+    public Profiler(boolean start) {
+        // Should the timer be started
+        if(start)
+            start();
+    }
+
+    /**
+     * Start the profiler.
+     *
+     * @return True if the profiler was started, false otherwise possibly due to an error.
+     * True will also be returned if the profiler was started already.
+     */
+    public boolean start() {
+        // Make sure the timer isn't started already
+        if(isActive())
+            return true;
+
+        // Set the start time
+        this.start = System.currentTimeMillis();
+        return true;
+    }
+
+    /**
+     * This will start the profiler if it's not active, or will stop the profiler if it's currently active.
+     *
+     * @return True if the profiler has been started, false if the profiler has been stopped.
+     */
+    public boolean pause() {
+        // Toggle the profiler state
+        if(isStarted())
+            stop();
+        else
+            start();
+
+        // Return the result
+        return isStarted();
+    }
+
+    /**
+     * Stop the profiler if it's active.
+     *
+     * @return True will be returned if the profiler was stopped while it was active. False will be returned if the
+     * profiler was stopped already.
+     */
+    public boolean stop() {
+        // Make sure the profiler is active
+        if(!isActive())
+            return false;
+
+        // Stop the profiler, calculate the passed time
+        this.time += System.currentTimeMillis() - this.start;
+        this.start = -1;
+        return true;
+    }
+
+    /**
+     * Check whether the profiler has been started. The profiler doesn't need to be active right now.
+     *
+     * @return True if the profiler was started, false otherwise.
+     */
+    public boolean isStarted() {
+        return isActive() || this.time > 0;
+    }
+
+    /**
+     * Check whether the profiler is currently active.
+     *
+     * @return True if the profiler is active, false otherwise.
+     */
+    public boolean isActive() {
+        return this.start >= 0;
+    }
+
+    /**
+     * Get the passed time in milliseconds.
+     *
+     * @return The passed time in milliseconds.
+     */
+    public long getTime() {
+        // Check whether the profiler is currently active
+        if(isActive())
+            return this.time + (System.currentTimeMillis() - this.start);
+        return this.time;
+    }
+
+    /**
+     * Get the passed time in a formatted string.
+     *
+     * @return The passed time in a formatted string.
+     */
+    public String getTimeFormatted() {
+        // Get the passed time
+        long time = getTime();
+
+        // Return the time if it's less than one millisecond
+        if(time <= 0)
+            return "<1 ms";
+
+        // Return the time in milliseconds
+        if(time < 1000)
+            return time + " ms";
+
+        // Convert the time into seconds with a single decimal
+        double timeSeconds = ((double) time) / 1000;
+        DecimalFormat df = new DecimalFormat("#0.0");
+        return df.format(timeSeconds) + " s";
+    }
+}