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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2011 Eric Lafortune (eric@graphics.cornell.edu)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* 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 for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.util;
/**
* This StringMatcher tests whether strings start with a specified variable
* string and then match another given StringMatcher.
*
* @author Eric Lafortune
*/
public class VariableStringMatcher implements StringMatcher
{
private final char[] allowedCharacters;
private final char[] disallowedCharacters;
private final int minimumLength;
private final int maximumLength;
private final StringMatcher nextMatcher;
public VariableStringMatcher(char[] allowedCharacters,
char[] disallowedCharacters,
int minimumLength,
int maximumLength,
StringMatcher nextMatcher)
{
this.allowedCharacters = allowedCharacters;
this.disallowedCharacters = disallowedCharacters;
this.minimumLength = minimumLength;
this.maximumLength = maximumLength;
this.nextMatcher = nextMatcher;
}
// Implementations for StringMatcher.
public boolean matches(String string)
{
if (string.length() < minimumLength)
{
return false;
}
// Check the first minimum number of characters.
for (int index = 0; index < minimumLength; index++)
{
if (!isAllowedCharacter(string.charAt(index)))
{
return false;
}
}
int maximumLength = Math.min(this.maximumLength, string.length());
// Check the remaining characters, up to the maximum number.
for (int index = minimumLength; index < maximumLength; index++)
{
if (nextMatcher.matches(string.substring(index)))
{
return true;
}
if (!isAllowedCharacter(string.charAt(index)))
{
return false;
}
}
// Check the remaining characters in the string.
return nextMatcher.matches(string.substring(maximumLength));
}
// Small utility methods.
/**
* Returns whether the given character is allowed in the variable string.
*/
private boolean isAllowedCharacter(char character)
{
// Check the allowed characters.
if (allowedCharacters != null)
{
for (int index = 0; index < allowedCharacters.length; index++)
{
if (allowedCharacters[index] == character)
{
return true;
}
}
return false;
}
// Check the disallowed characters.
if (disallowedCharacters != null)
{
for (int index = 0; index < disallowedCharacters.length; index++)
{
if (disallowedCharacters[index] == character)
{
return false;
}
}
}
// Any remaining character is allowed.
return true;
}
}
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