1 files changed, 111 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/profiler/output/TextPrinter.java b/src/main/java/com/google/devtools/build/lib/profiler/output/TextPrinter.java
new file mode 100644
index 0000000000..5b6413e88d
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/profiler/output/TextPrinter.java
@@ -0,0 +1,111 @@
+// Copyright 2015 Google Inc. All rights reserved.
+//
+// Licensed 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 com.google.devtools.build.lib.profiler.output;
+
+import com.google.common.base.Preconditions;
+
+import java.io.PrintStream;
+
+/**
+ * Utility function for writing text data to a {@link PrintStream}.
+ */
+public abstract class TextPrinter {
+
+  protected static final String TWO_COLUMN_FORMAT = "%-37s %10s";
+  protected static final String THREE_COLUMN_FORMAT = "%-28s %10s %8s";
+
+  private static final String INDENT = "  ";
+  protected final PrintStream out;
+  private StringBuffer indent;
+
+  protected TextPrinter(PrintStream out) {
+    this.out = out;
+    this.indent = new StringBuffer();
+  }
+
+  /**
+   * Increase indentation level
+   */
+  protected void down() {
+    indent.append(INDENT);
+  }
+
+  /**
+   * Decrease indentation level
+   */
+  protected void up() {
+    Preconditions.checkState(
+        indent.length() >= INDENT.length(),
+        "Cannot reduce indentation level, this/a previous call to up() is not matched by down().");
+    indent.setLength(indent.length() - INDENT.length());
+  }
+
+  protected void print(Object text) {
+    out.print(text);
+  }
+
+  protected void printLn() {
+    out.println();
+  }
+
+  /**
+   * newline and indent by current indentation level
+   */
+  protected void lnIndent() {
+    printLn();
+    out.print(indent);
+  }
+
+  /**
+   * newline, indent and print the Object
+   * @see PrintStream#print(Object)
+   */
+  protected void lnPrint(Object text) {
+    lnIndent();
+    out.print(text);
+  }
+
+  /**
+   * print text and a newline
+   */
+  protected void printLn(String text) {
+    out.print(text);
+    printLn();
+  }
+
+  /**
+   * newline, indent and print the formatted text
+   */
+  protected void lnPrintf(String format, Object... args) {
+    lnIndent();
+    out.printf(format, args);
+  }
+
+  protected void printf(String format, Object... args) {
+    out.printf(format, args);
+  }
+
+  /**
+   * Represents a double value as either "N/A" if it is NaN, or as a percentage with "%.2f%%".
+   * @param relativeValue is assumed to be a ratio of two values and will be multiplied with 100
+   *    for output
+   */
+  public static String prettyPercentage(double relativeValue) {
+    if (Double.isNaN(relativeValue)) {
+      return "N/A";
+    }
+    return String.format("%.2f%%", relativeValue * 100);
+  }
+}
+