com.unboundid.util.HorizontalAlignment Maven / Gradle / Ivy
/*
* Copyright 2009-2017 UnboundID Corp.
* All Rights Reserved.
*/
/*
* Copyright (C) 2009-2017 UnboundID Corp.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (GPLv2 only)
* or the terms of the GNU Lesser General Public License (LGPLv2.1 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see .
*/
package com.unboundid.util;
/**
* This enumeration defines a set of values that may indicate how text should be
* horizontally aligned.
*/
@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public enum HorizontalAlignment
{
/**
* Indicates that items should be aligned along their left edges.
*/
LEFT(),
/**
* Indicates that text should be aligned along their centers.
*/
CENTER(),
/**
* Indicates that text should be aligned along right edges.
*/
RIGHT();
/**
* Appends the provided string to the given buffer, aligned properly within
* the specified width. Spaces will be inserted before and/or after the text
* as necessary to achieve the desired alignment. This method will always
* append exactly {@code width} characters (including spaces added to achieve
* the desired alignment) to the provided buffer. If the given text is longer
* than {@code width}, then only the first {@code width} characters of the
* provided text will be appended.
*
* @param buffer The buffer to which the formatted text should be appended.
* It must not be {@code null}.
* @param text The text to be added to the provided buffer, with
* additional spaces as necessary to achieve the desired
* width. It must not be {@code null}.
* @param width The number of characters to append to the provided buffer.
* It must be greater than or equal to 1.
*/
public void format(final StringBuilder buffer, final String text,
final int width)
{
final int length = text.length();
if (length >= width)
{
buffer.append(text.substring(0, width));
return;
}
final int spacesBefore;
final int spacesAfter;
switch (this)
{
case LEFT:
spacesBefore = 0;
spacesAfter = width - length;
break;
case CENTER:
final int totalSpaces = width - length;
spacesBefore = totalSpaces / 2;
spacesAfter = totalSpaces - spacesBefore;
break;
case RIGHT:
default:
spacesBefore = width - length;
spacesAfter = 0;
break;
}
for (int i=0; i < spacesBefore; i++)
{
buffer.append(' ');
}
buffer.append(text);
for (int i=0; i < spacesAfter; i++)
{
buffer.append(' ');
}
}
}