Created
July 23, 2012 16:53
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make a string from an iterator or array using an optional separator and prefix-suffix values
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public static String mkString(Iterable<?> values, String start, String sep, String end){ | |
// if the array is null or empty return an empty string | |
if(values == null || !values.iterator().hasNext()) | |
return ""; | |
// move all non-empty values from the original array to a new list (empty is a null, empty or all-whitespace string) | |
List<String> nonEmptyVals = new LinkedList<String>(); | |
for (Object val : values) { | |
if(val != null && val.toString().trim().length() > 0){ | |
nonEmptyVals.add(val.toString()); | |
} | |
} | |
// if there are no "non-empty" values return an empty string | |
if(nonEmptyVals.size() == 0) | |
return ""; | |
// iterate the non-empty values and concatenate them with the separator, the entire string is surrounded with "start" and "end" parameters | |
StringBuilder result = new StringBuilder(); | |
result.append(start); | |
int i = 0; | |
for (String val : nonEmptyVals) { | |
if(i > 0) | |
result.append(sep); | |
result.append(val); | |
i++; | |
} | |
result.append(end); | |
return result.toString(); | |
} | |
public static String mkString(Object[] values, String start, String sep, String end){ | |
return mkString(Arrays.asList(values), start, sep, end); | |
} |
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