/*
* :noTabs=false:
*
* Copyright (C) 2008 Kazutoshi Satoda
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This library 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 Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
package org.gjt.sp.util;
/**
* Reversed view of a given CharSequence.
*/
public class ReverseCharSequence implements CharSequence
{
public ReverseCharSequence(CharSequence base)
{
this.base = base;
}
public CharSequence baseSequence()
{
return base;
}
public char charAt(int index)
{
return base.charAt(base.length() - index - 1);
}
public int length()
{
return base.length();
}
public CharSequence subSequence(int start, int end)
{
int baseLength = base.length();
return new ReverseCharSequence(
base.subSequence(baseLength - end, baseLength - start));
}
public String toString()
{
int baseLength = base.length();
StringBuilder builder = new StringBuilder(baseLength);
for (int i = baseLength - 1; i >= 0; --i)
{
builder.append(base.charAt(i));
}
return builder.toString();
}
private final CharSequence base;
}