edu.uci.ics.jung.visualization.util.LabelWrapper Maven / Gradle / Ivy
/*
* Copyright (c) 2005, The JUNG Authors
* All rights reserved.
*
* This software is open-source under the BSD license; see either "license.txt"
* or https://github.com/jrtom/jung/blob/master/LICENSE for a description.
*
*/
package edu.uci.ics.jung.visualization.util;
import java.util.function.Function;
/**
* A utility to wrap long lines, creating html strings with line breaks at a settable max line
* length
*
* @author Tom Nelson - [email protected]
*/
public class LabelWrapper implements Function {
int lineLength;
public static final String breaker = "";
/** Create an instance with default line break length = 10 */
public LabelWrapper() {
this(10);
}
/**
* Create an instance with passed line break length
*
* @param lineLength the max length for lines
*/
public LabelWrapper(int lineLength) {
this.lineLength = lineLength;
}
/** call 'wrap' to transform the passed String */
public String apply(String str) {
if (str != null) {
return wrap(str);
} else {
return null;
}
}
/**
* line-wrap the passed String as an html string with break Strings inserted.
*
* @param str
* @return
*/
private String wrap(String str) {
StringBuilder buf = new StringBuilder(str);
int len = lineLength;
while (len < buf.length()) {
int idx = buf.lastIndexOf(" ", len);
if (idx != -1) {
buf.replace(idx, idx + 1, breaker);
len = idx + breaker.length() + lineLength;
} else {
buf.insert(len, breaker);
len += breaker.length() + lineLength;
}
}
buf.insert(0, "");
return buf.toString();
}
public static void main(String[] args) {
String[] lines = {
"This is a line with many short words that I will break into shorter lines.",
"thisisalinewithnobreakssowhoknowswhereitwillwrap",
"short line"
};
LabelWrapper w = new LabelWrapper(10);
for (int i = 0; i < lines.length; i++) {
System.err.println("from " + lines[i] + " to " + w.wrap(lines[i]));
}
}
}