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XLT (Xceptance LoadTest) is an extensive load and performance test tool developed and maintained by Xceptance.
/*
* Copyright (c) 2005-2022 Xceptance Software Technologies GmbH
*
* 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.xceptance.common.util;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.text.ParseException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.xceptance.common.lang.StringUtils;
/**
* Utility class for parsing various objects or values.
*
* @author Hartmut Arlt (Xceptance Software Technologies GmbH)
*/
public final class ParseUtils
{
/**
* Time base.
*/
private static final int TIME_BASE = 60;
/**
* Default constructor. Declared private to prevent external instantiation.
*/
private ParseUtils()
{
}
/**
* Returns the resolved class object identified by the given class name.
*
* @param className
* name of class
* @return resolved class object
* @throws ParseException
* thrown when given class name could not be resolved
*/
public static Class parseClass(final String className) throws ParseException
{
try
{
return Class.forName(className);
}
catch (final ClassNotFoundException e)
{
throw new ParseException("Failed to parse '" + className + "' as class name.", 0);
}
}
/**
* Returns an URL object for the given URL string.
*
* @param urlString
* URL string
* @return URL object
* @throws ParseException
* thrown when the format of the given URL string is invalid
* @deprecated due to a bug in {@link URL#URL(String)} omitting the two slashes for the protocol
*/
@Deprecated
public static URL parseURL(final String urlString) throws ParseException
{
ParameterCheckUtils.isNotNullOrEmpty(urlString, "urlString");
try
{
return new URL(urlString.trim());
}
catch (final MalformedURLException e)
{
throw new ParseException("Failed to parse '" + urlString + "' as URL.", 0);
}
}
/**
* Returns an URI object for the given URI string. This is intended as a replacement for the buggy #parseURL.
*
* @param urlString
* URL string
* @return URL object
* @throws ParseException
* thrown when the format of the given URL string is invalid
* @see #parseURL(String)
*/
public static URI parseURI(final String urlString) throws ParseException
{
ParameterCheckUtils.isNotNullOrEmpty(urlString, "urlString");
try
{
return new URI(urlString.trim());
}
catch (final URISyntaxException e)
{
throw new ParseException("Failed to parse '" + urlString + "' as URI.", 0);
}
}
/**
* Parses the given string for a time period using the time formats specified by {@link TimeFormat}. After parsing,
* its value as total number of seconds is returned.
*
* @param s
* time period string
* @return value of time period as total number of seconds
* @throws ParseException
* thrown if the given string doesn't represent a valid time period string
*/
public static int parseTimePeriod(final String s) throws ParseException
{
ParameterCheckUtils.isNotNullOrEmpty(s, "s");
final String timeString = StringUtils.replaceAll(s, "\\s+", "");
for (final TimeFormat tFormat : TimeFormat.values())
{
final Matcher m = tFormat.getPattern().matcher(timeString);
if (m.matches())
{
return tFormat.evaluate(m);
}
}
throw new ParseException(String.format("Unknown format of time period '%s'.", s), 0);
}
/**
* Parses the given string for a time period using the time formats specified by {@link TimeFormat}. The first
* character may be an ASCII minus sign {@code '-'} (\u002D') to indicate a negative value or an
* ASCII plus sign {@code '+'} ('\u002B') to indicate a positive value. After parsing, its value as
* total number of seconds is returned.
*
* @param s
* time period string
* @return value of time period as total number of seconds
* @throws ParseException
* thrown if the given string doesn't represent a valid time period string
*/
public static int parseRelativeTimePeriod(final String s) throws ParseException
{
ParameterCheckUtils.isNotNullOrEmpty(s, "s");
String timeString = s.trim();
// first character can indicate a positive or negative time period
final char operator = timeString.charAt(0);
if (operator == '-' || operator == '+')
{
timeString = timeString.substring(1);
}
// parse without operator
int time = parseTimePeriod(timeString);
// apply operator
if (operator == '-')
{
time *= -1;
}
return time;
}
/**
* Parses the given string for an integer value and returns it.
*
* @param s
* string to parse
* @return integer value contained in the given string
* @throws ParseException
* thrown if the given string is an invalid integer representation
*/
public static int parseInt(final String s) throws ParseException
{
ParameterCheckUtils.isNotNullOrEmpty(s, "s");
try
{
return Integer.parseInt(s.trim());
}
catch (final NumberFormatException nfe)
{
throw new ParseException(String.format("Failed to parse '%s' as integer.", s), 0);
}
}
/**
* Parses the given string for to a double value and returns it.
*
* @param s
* string to parse
* @return double value contained in the given string
* @throws ParseException
* thrown if the given string is an invalid double representation
*/
public static double parseDouble(final String s) throws ParseException
{
ParameterCheckUtils.isNotNullOrEmpty(s, "s");
try
{
return Double.parseDouble(s.trim());
}
catch (final NumberFormatException nfe)
{
throw new ParseException(String.format("Failed to parse '%s' as a double.", s), 0);
}
}
/**
* Parses the given string for an integer value and returns it.
*
* @param s
* string to parse
* @param defaultValue
* the value to return in case the string cannot be parsed as an integer
* @return integer value contained in the given string
*/
public static int parseInt(final String s, final int defaultValue)
{
try
{
return parseInt(s);
}
catch (final Exception e)
{
return defaultValue;
}
}
/**
* Parses the given string for a long value and returns it.
*
* @param s
* string to parse
* @return long value contained in the given string
* @throws ParseException
* thrown if the given string is an invalid long representation
*/
public static long parseLong(final String s) throws ParseException
{
ParameterCheckUtils.isNotNullOrEmpty(s, "s");
try
{
return Long.parseLong(s.trim());
}
catch (final NumberFormatException fe)
{
throw new ParseException(String.format("Failed to parse '%s' as long.", s), 0);
}
}
/**
* Parses the given string for a long value and returns it.
*
* @param s
* string to parse
* @param defaultValue
* the value to return in case the string cannot be parsed as a long
* @return long value contained in the given string
*/
public static long parseLong(final String s, final long defaultValue)
{
try
{
return parseLong(s);
}
catch (final Exception e)
{
return defaultValue;
}
}
/**
* Time period formats.
*/
private static enum TimeFormat
{
/**
* Natural format (sequence of digits).
*/
NATURAL("(\\d+)s?"),
/**
* Accumulated format (HHhMMmSSs).
*/
ACCUMULATED("(\\d+h)?(\\d+m)?(\\d+s)?"),
/**
* Digit format (HH:MM:SS).
*/
DIGIT("(?:(\\d+):)?([0-5]?\\d):([0-5]?\\d)");
/**
* Constructs a new time format using the given regular expression.
*
* @param s
* regular expression of the time format values
*/
private TimeFormat(final String s)
{
pattern = Pattern.compile(s);
}
/**
* Regular expression of this time format values.
*/
private final Pattern pattern;
/**
* Returns the regular expression of this time format values.
*
* @return time format value regular expression
*/
private Pattern getPattern()
{
return pattern;
}
/**
* Evaluates the given matching time period string.
*
* @param matcher
* matching time period string
* @return value of matching time period string converted to total number of seconds
* @throws ParseException
* thrown by {@link ParseUtils#parseInt(String)}
*/
private int evaluate(final Matcher matcher) throws ParseException
{
if (equals(TimeFormat.NATURAL))
{
return parseInt(matcher.group(1));
}
if (equals(TimeFormat.DIGIT))
{
int time = 0;
final int groups = matcher.groupCount();
for (int i = groups; i > 0; i--)
{
final String group = matcher.group(i);
if (group == null || group.length() == 0)
{
continue;
}
final int timeVal = parseInt(matcher.group(i));
time += timeVal * (Math.pow(TIME_BASE, groups - i));
}
return time;
}
if (equals(TimeFormat.ACCUMULATED))
{
int time = 0;
for (int i = 1; i <= matcher.groupCount(); i++)
{
final String group = matcher.group(i);
if (group == null || group.length() == 0)
{
continue;
}
final String s = group.substring(0, group.length() - 1);
final int timeVal = parseInt(s);
final int exp = group.endsWith("h") ? 2 : (group.endsWith("m") ? 1 : 0);
time += timeVal * (Math.pow(TIME_BASE, exp));
}
return time;
}
return 0;
}
}
}