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/*--
$Id: TextHelper.java,v 1.2 2004/02/06 09:57:48 jhunter Exp $
Copyright (C) 2000-2004 Jason Hunter & Brett McLaughlin.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions, and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions, and the disclaimer that follows
these conditions in the documentation and/or other materials
provided with the distribution.
3. The name "JDOM" must not be used to endorse or promote products
derived from this software without prior written permission. For
written permission, please contact .
4. Products derived from this software may not be called "JDOM", nor
may "JDOM" appear in their name, without prior written permission
from the JDOM Project Management .
In addition, we request (but do not require) that you include in the
end-user documentation provided with the redistribution and/or in the
software itself an acknowledgement equivalent to the following:
"This product includes software developed by the
JDOM Project (http://www.jdom.org/)."
Alternatively, the acknowledgment may be graphical using the logos
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
This software consists of voluntary contributions made by many
individuals on behalf of the JDOM Project and was originally
created by Jason Hunter and
Brett McLaughlin . For more information
on the JDOM Project, please see
* This class contains static helper methods.
*
* @author Alex Rosen
*/
public class TextHelper {
/**
*
* This returns the text with surrounding whitespace removed and
* internal whitespace normalized to a single space.
*
*/
public static String normalize(String text) {
char[] chars = text.toCharArray();
char[] newChars = new char[chars.length];
boolean white = true;
int pos = 0;
for (int i = 0; i < chars.length; i++) {
char c = chars[i];
if (c == ' ' || c == '\r' || c == '\n' || c == '\t') {
if (!white) {
newChars[pos++] = ' ';
white = true;
}
}
else {
newChars[pos++] = c;
white = false;
}
}
if (white && pos > 0) {
pos--;
}
return new String(newChars, 0, pos);
}
/**
*
* This convenience method returns the textual content of the named
* child element, or returns an empty String ("")
* if the child has no textual content. However, if the child does
* not exist, null is returned.
*
*
* @param parent the parent element
* @param name the name of the child
* @return text content for the named child, or null if no
* such child exists
*/
public static String getChildText(Element parent, String name) {
Element child = parent.getChild(name);
if (child == null) {
return null;
}
return child.getText();
}
/**
*
* This convenience method returns the textual content of the named
* child element, or returns an empty String ("")
* if the child has no textual content. However, if the child does
* not exist, null is returned.
*
*
* @param parent the parent element
* @param name the name of the child
* @param ns the namespace of the child
* @return text content for the named child, or null if no
* such child exists
*/
public static String getChildText(Element parent, String name, Namespace ns) {
Element child = parent.getChild(name, ns);
if (child == null) {
return null;
}
return child.getText();
}
/**
*
* This convenience method returns the trimmed textual content of the
* named child element, or returns null if there's no such child.
* See String.trim() for details of text trimming.
*
*
* @param parent the parent element
* @param name the name of the child
* @return trimmed text content for the named child, or null if no
* such child exists
*/
public static String getChildTextTrim(Element parent, String name) {
Element child = parent.getChild(name);
if (child == null) {
return null;
} else {
return child.getText().trim();
}
}
/**
*
* This convenience method returns the trimmed textual content of the
* named child element, or returns null if there's no such child.
* See String.trim() for
* details of text trimming.
*
*
* @param parent the parent element
* @param name the name of the child
* @param ns the namespace of the child
* @return trimmed text content for the named child, or null if no
* such child exists
*/
public static String getChildTextTrim(Element parent, String name, Namespace ns) {
Element child = parent.getChild(name, ns);
if (child == null) {
return null;
} else {
return child.getText().trim();
}
}
/**
*
* This convenience method returns the normalized textual content of the
* named child element, or returns null if there's no such child.
* See {@link #normalize} for details of text normalization.
*
*
* @param parent the parent element
* @param name the name of the child
* @return normalized text content for the named child, or null if no
* such child exists
*/
public static String getChildTextNormalize(Element parent, String name) {
Element child = parent.getChild(name);
if (child == null) {
return null;
} else {
return normalize(child.getText());
}
}
/**
*
* This convenience method returns the normalized textual content of the
* named child element, or returns null if there's no such child.
* See {@link #normalize} for
* details of text normalization.
*
*
* @param parent the parent element
* @param name the name of the child
* @param ns the namespace of the child
* @return normalized text content for the named child, or null if no
* such child exists
*/
public static String getChildTextNormalize(Element parent, String name, Namespace ns) {
Element child = parent.getChild(name, ns);
if (child == null) {
return null;
} else {
return normalize(child.getText());
}
}
}