/*
*
* This file is part of the iText (R) project.
Copyright (c) 1998-2017 iText Group NV
* Authors: Balder Van Camp, Emiel Ackermann, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS
*
* 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 Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: sales@itextpdf.com
*/
package com.itextpdf.tool.xml;
import java.util.List;
import com.itextpdf.tool.xml.exceptions.LocaleMessages;
import com.itextpdf.tool.xml.exceptions.NoSiblingException;
/**
*
* Utilities that perform operations on tags.
* @author Emiel Ackermann
*
*/
public class TagUtils {
private static final TagUtils myself = new TagUtils();
/**
*
*/
public TagUtils() {
}
/**
* Method used for retrieving a sibling of the given tag t.
*
* @param t tag to find the previous sibling of
* @param i int index relative to the one of the given tag. (-i for previous siblings)
* @return the previous sibling
* @throws NoSiblingException when no previous sibling can be found, because the tag is the first child.
*/
public Tag getSibling(final Tag t, final int i) throws NoSiblingException {
Tag sibling = null;
try {
List<Tag> siblings = t.getParent().getChildren();
sibling = siblings.get(siblings.indexOf(t)+i);
} catch(IndexOutOfBoundsException e) {
throw new NoSiblingException(String.format(LocaleMessages.getInstance().getMessage(LocaleMessages.NO_SIBLING),t.getName(), i), e);
}
return sibling;
}
/**
* @return singleton instance of TagUtils
*
*/
public static TagUtils getInstance() {
return myself;
}
}