/*
*
*
* Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program 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 program 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 at /legal/license.txt).
*
* 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 Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package com.sun.cldchi.tools.memoryprofiler.jdwp;
import java.util.Vector;
import java.util.StringTokenizer;
/**
* This class contains some auxillary functions that are used by
* classes of <code>jdwp</code> package.
*/
class Tools {
/**
* Returns a hex representation of <code>long</code> value with
* leading zeros.
*
* @param b an integer value
* @param length a size of the integer value (2 for <code>short</code>,
* 4 for <code>int</code>, 8 for <code>long</code>)
* @return a hex representation of <code>long</code> value with
* leading zeros
*/
public static String Hex(long b, int length) {
return Right(Long.toHexString(b), length).replace(' ', '0');
}
/**
* Addes the specified substring to the beginning of the specified string
* a few times until the length of the string becomes not less than the
* specified length. If the length of the string is already more than
* the specified length the resulting value if a string of asterisks with
* the specified length.
*
* @param source a source string to align
* @param length a desired length of the result string
* @param what a substring that must be appended to the beginning of the
* string
* @return an aligned string
*/
public static String PadL(String source, int length, String what) {
if (length <= 0)
return "";
if (source.length() > length)
return PadL("", length, "*");
while (source.length() < length)
source = what + source;
return source;
}
/**
* Addes spaces to the beginning of the specified string
* a few times until the length of the string becomes not less than the
* specified length. If the length of the string is already more than
* the specified length the resulting value if a string of asterisks with
* the specified length.
*
* @param source a source string to align
* @param length a desired length of the result string
* @return an aligned string
*/
public static String PadL(String source, int length) {
return PadL(source, length, " ");
}
/**
* Appends the specified substring to the end of the specified string
* a few times until the length of the string becomes not less than the
* specified length. If the length of the string is already more than
* the specified length the resulting value if a string of asterisks with
* the specified length.
*
* @param source a source string to align
* @param length a desired length of the result string
* @param what a substring that must be appended to the end of the
* string
* @return an aligned string
*/
public static String PadR(String source, int length, String what) {
if (length <= 0)
return "";
if (source.length() > length)
return PadR("", length, "*");
while (source.length() < length)
source = source + what;
return source;
}
/**
* Appends spaces to the end of the specified string
* a few times until the length of the string becomes not less than the
* specified length. If the length of the string is already more than
* the specified length the resulting value if a string of asterisks with
* the specified length.
*
* @param source a source string to align
* @param length a desired length of the result string
* @return an aligned string
*/
public static String PadR(String source, int length) {
return PadR(source, length, " ");
}
/**
* Truncates or increases the specified string to the specified
* length. If the source string is less that the desired length the
* necessary number of spaces is added to the end of the string.
* If the source string is more
* than the desired length the necessary number of last characters is
* removed.
*
* @param source a sring to be aligned
* @param length a desired length of the string
* @return an aligned string
*/
public static String Left(String source, int length) {
if (length <= 0)
return "";
if (length <= source.length())
return source.substring(0, length);
else
return PadR(source, length);
}
/**
* Truncates or increases the specified string to the specified
* length. If the source string is less that the desired length the
* necessary number of spaces is added to the beginning of the string.
* If the source string is more
* than the desired length the necessary number of first characters is
* removed.
*
* @param source a sring to be aligned
* @param length a desired length of the string
* @return an aligned string
*/
public static String Right(String source, int length) {
if (length <= 0)
return "";
if (length <= source.length())
return source.substring(source.length() - length, source.length());
else
return PadL(source, length);
}
/**
* Returns a content of the vector as a string where elements of the vector
* are separated by tabs.
*
* @param v a vector that should be represented as a string
* @return a string representation of the vector
*/
public static String listVector(Vector v) {
String s = "";
for (int i = 0; i < v.size(); i++)
s = s + (i + 1) + "\t" + v.elementAt(i) + "\n";
return s;
}
/**
* Returns a number of tokens in the string. Token delimiters are
* spaces, colons, commas and tab characters.
*
* @param a string that consist on tokens and delimiteres.
* @return a number of tokens in the string
*/
public static int countBytes(String s) {
return (new StringTokenizer(s, " :,\t")).countTokens();
}
/**
* Converts a string that is a list of bytes separated by
* spaces, colons, commas and tab characters
* (for example, <code>01,15,44,135</code>) to byte array.
*
* @param s a string to be converted
* @return an array of bytes that corresponds to the source string
*/
public static byte[] str2bytes(String s) throws Exception {
StringTokenizer t = new StringTokenizer(s, " :,\t");
byte[] buf = new byte[t.countTokens()];
int k = 0;
while (t.hasMoreTokens())
buf[k++] = Integer.decode(t.nextToken()).byteValue();
return buf;
}
/**
* Suspends the current thread for the specified number of
* milliseconds.
*
* @param delay suspend time in milliseconds
*/
public static void wait(int delay) {
try {
Thread.sleep(delay);
}
catch (Exception e) {}
}
}
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