Mercurial > hg > blitz_condensed
view src/com/go/trove/io/LinePositionReader.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
---|---|
date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
children |
line wrap: on
line source
/* ==================================================================== * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group * ==================================================================== * The Tea Software License, Version 1.1 * * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The end-user documentation included with the redistribution, * if any, must include the following acknowledgment: * "This product includes software developed by the * Walt Disney Internet Group (http://opensource.go.com/)." * Alternately, this acknowledgment may appear in the software itself, * if and wherever such third-party acknowledgments normally appear. * * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must * not be used to endorse or promote products derived from this * software without prior written permission. For written * permission, please contact opensource@dig.com. * * 5. Products derived from this software may not be called "Tea", * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior * written permission of the Walt Disney Internet Group. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * For more information about Tea, please see http://opensource.go.com/. */ package com.go.trove.io; import java.io.*; /****************************************************************************** * LinePositionReader aids in printing line numbers for error reporting. * * @author Brian S O'Neill * @version * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 12/11/00 <!-- $--> */ public class LinePositionReader extends PositionReader { private int mLineNumber = 1; private int mPushback = -1; public LinePositionReader(Reader reader) { super(reader); } public int read() throws IOException { int c; if (mPushback >= 0) { c = mPushback; mPushback = -1; } else { c = super.read(); } if (c == '\n') { mLineNumber++; } else if (c == '\r') { int peek = super.read(); if (peek != '\n') { mLineNumber++; } mPushback = peek; } return c; } /** * After calling readLine, calling getLineNumber returns the next line * number. */ public String readLine() throws IOException { StringBuffer buf = new StringBuffer(80); int line = mLineNumber; int c; while (line == mLineNumber && (c = read()) >= 0) { buf.append((char)c); } return buf.toString(); } /** * Skips forward into the stream to the line number specified. The line * can then be read by calling readLine. Calling getPosition * returns the position that the line begins. * * @return the line number reached */ public int skipForwardToLine(int line) throws IOException { while (mLineNumber < line && read() >= 0) {} return mLineNumber; } /** * @return the number of the line currently being read or the next one * available. */ public int getLineNumber() { return mLineNumber; } /** * Converts all whitespace characters in a String to space characters * (\u0020). */ public static String cleanWhitespace(String str) { int length = str.length(); StringBuffer buf = new StringBuffer(length); for (int i=0; i<length; i++) { char c = str.charAt(i); if (Character.isWhitespace(c)) { buf.append(' '); } else { buf.append(c); } } return buf.toString(); } /** * Creates and returns a String containing a sequence of the specified * length, repeating the given character. */ public static String createSequence(char c, int length) { if (length < 0) length = 1; StringBuffer buf = new StringBuffer(length); for (; length > 0; length--) { buf.append(c); } return buf.toString(); } }