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// Copyright 2015 The Bazel Authors. 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);
}
}
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