package difflib;

import java.util.Iterator;

import java.util.LinkedList;

import java.util.List;

public class StringUtills {

public static <T> String join(final Iterable<T> objs, final String delimiter) {

Iterator<T> iter = objs.iterator();

if (!iter.hasNext()) {

return "";

}

StringBuffer buffer = new StringBuffer(String.valueOf(iter.next()));

while (iter.hasNext()) {

buffer.append(delimiter).append(String.valueOf(iter.next()));

}

return buffer.toString();

}

public static String expandTabs(String str) {

return str.replace("\t", " ");

}

public static String htmlEntites(String str) {

return str.replace("<", "&lt;").replace(">", "&gt;");

}

public static String normalize(String str) {

return expandTabs(htmlEntites(str));

}

public static List<String> normalize(List<String> list) {

List<String> result = new LinkedList<String>();

for (String line : list) {

result.add(normalize(line));

}

return result;

}

public static List<String> wrapText(List<String> list, int columnWidth) {

List<String> result = new LinkedList<String>();

for (String line : list) {

result.add(wrapText(line, columnWidth));

}

return result;

}

/**

* Wrap the text with the given column width

* @param line the text

* @param columnWidth the given column

* @return the wrapped text

*/

public static String wrapText(String line, int columnWidth) {

int lenght = line.length();

int delimiter = "<br>".length();

int widthIndex = columnWidth;

for (int count = 0; lenght > widthIndex; count++) {

line = line.subSequence(0, widthIndex + delimiter * count) + "<br>"

+ line.substring(widthIndex + delimiter * count);

widthIndex += columnWidth;

}

return line;

}

}