Mercurial > hg > truffle
view graal/com.oracle.max.base/src/com/sun/max/io/IndentWriter.java @ 4266:e2499e6d8aa7
Merge
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Wed, 11 Jan 2012 16:31:46 +0100 |
parents | e233f5660da4 |
children |
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/* * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.sun.max.io; import java.io.*; import com.sun.max.program.*; /** * A line oriented character writer that indents line output on the left. */ public class IndentWriter { private final PrintWriter writer; private int lineCount; /** * Gets an IndentWriter that wraps the {@linkplain Trace#stream() trace stream}. * @return */ public static IndentWriter traceStreamWriter() { return new IndentWriter(new OutputStreamWriter(Trace.stream())); } public IndentWriter(Writer writer) { this.writer = (writer instanceof PrintWriter) ? (PrintWriter) writer : new PrintWriter(writer); } public void close() { writer.close(); } public void flush() { writer.flush(); } private int indentation = 4; public int indentation() { return indentation; } public void setIndentation(int indentation) { this.indentation = indentation; } private int prefix; public void indent() { prefix += indentation; } public void outdent() { prefix -= indentation; assert prefix >= 0; } private boolean isCurrentLineIndented; private void writeIndentation() { if (!isCurrentLineIndented) { for (int i = 0; i < prefix; i++) { writer.print(" "); } isCurrentLineIndented = true; } } public void printSpaces(int width) { for (int i = 0; i < width; i++) { writer.print(" "); } } public void printFixedWidth(String s, int width) { assert width > 0 : "width must be positive"; String text = s; if (text.length() + 1 > width) { if (width - 4 > 0) { text = s.substring(0, width - 4) + "..."; } else { text = s.substring(0, width); } } writer.print(text); printSpaces(width - text.length()); } public void print(String s) { writeIndentation(); writer.print(s); } public void println() { writer.println(); isCurrentLineIndented = false; ++lineCount; } public void println(String s) { writeIndentation(); writer.println(s); isCurrentLineIndented = false; ++lineCount; } public void printLines(InputStream inputStream) { printLines(new InputStreamReader(inputStream)); } public void printLines(Reader reader) { final BufferedReader bufferedReader = reader instanceof BufferedReader ? (BufferedReader) reader : new BufferedReader(reader); String line; try { while ((line = bufferedReader.readLine()) != null) { println(line); } } catch (IOException e) { ProgramWarning.message(e.toString()); } } public int lineCount() { return lineCount; } }