1 files changed, 82 insertions, 0 deletions
diff --git a/src/com/gitblit/utils/ByteFormat.java b/src/com/gitblit/utils/ByteFormat.java
new file mode 100644
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--- /dev/null
+++ b/src/com/gitblit/utils/ByteFormat.java
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+/*
+ * Copyright 2011 Squeal Group.  Licensed under the Eclipse Public License, 
+ * Version 1.0 (http://www.eclipse.org/legal/epl-v10.html).
+ * Initial Developer: Squeal Group
+ */
+package com.gitblit.utils;
+
+import java.text.DecimalFormat;
+import java.text.FieldPosition;
+import java.text.Format;
+import java.text.ParsePosition;
+
+/**
+ * A formatter for formatting byte sizes. For example, formatting 12345 byes
+ * results in "12.1 K" and 1234567 results in "1.18 MB".
+ * 
+ */
+public class ByteFormat extends Format {
+
+	private static final long serialVersionUID = 1L;
+
+	public ByteFormat() {
+	}
+
+	// Implemented from the Format class
+
+	/**
+	 * Formats a long which represent a number of bytes.
+	 */
+	public String format(long bytes) {
+		return format(Long.valueOf(bytes));
+	}
+
+	/**
+	 * Formats a long which represent a number of kilobytes.
+	 */
+	public String formatKB(long kilobytes) {
+		return format(Long.valueOf(kilobytes * 1024));
+	}
+
+	/**
+	 * Format the given object (must be a Long).
+	 * 
+	 * @param obj
+	 *            assumed to be the number of bytes as a Long.
+	 * @param buf
+	 *            the StringBuffer to append to.
+	 * @param pos
+	 * @return A formatted string representing the given bytes in more
+	 *         human-readable form.
+	 */
+	public StringBuffer format(Object obj, StringBuffer buf, FieldPosition pos) {
+		if (obj instanceof Long) {
+			long numBytes = ((Long) obj).longValue();
+			if (numBytes < 1024) {
+				DecimalFormat formatter = new DecimalFormat("#,##0");
+				buf.append(formatter.format((double) numBytes)).append(" b");
+			} else if (numBytes < 1024 * 1024) {
+				DecimalFormat formatter = new DecimalFormat("#,##0.0");
+				buf.append(formatter.format((double) numBytes / 1024.0)).append(" KB");
+			} else if (numBytes < 1024 * 1024 * 1024) {
+				DecimalFormat formatter = new DecimalFormat("#,##0.0");
+				buf.append(formatter.format((double) numBytes / (1024.0 * 1024.0))).append(" MB");
+			} else {
+				DecimalFormat formatter = new DecimalFormat("#,##0.0");
+				buf.append(formatter.format((double) numBytes / (1024.0 * 1024.0 * 1024.0))).append(" GB");
+			}
+		}
+		return buf;
+	}
+
+	/**
+	 * In this implementation, returns null always.
+	 * 
+	 * @param source
+	 * @param pos
+	 * @return returns null in this implementation.
+	 */
+	public Object parseObject(String source, ParsePosition pos) {
+		return null;
+	}
+}