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@ -74,6 +74,42 @@ public final class Utils {
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public static String join(String delimiter, Iterable<? extends Object> objs) { |
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return join(delimiter, "", objs); |
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} |
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public static String concat(CharSequence... strings) { |
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if (strings.length == 0){ |
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return ""; |
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} |
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if (strings.length == 1){ |
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return strings[0].toString(); |
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} |
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int length = 0; |
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// -1 = no result, -2 = multiple results
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int indexOfSingleNonEmptyString = -1; |
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for (int i = 0; i< strings.length; i++) { |
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CharSequence charSequence = strings[i]; |
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int len = charSequence.length(); |
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length += len; |
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if (indexOfSingleNonEmptyString != -2 && len > 0){ |
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if (indexOfSingleNonEmptyString == -1){ |
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indexOfSingleNonEmptyString = i; |
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} else { |
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indexOfSingleNonEmptyString = -2; |
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} |
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} |
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} |
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if (length == 0){ |
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return ""; |
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} |
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if (indexOfSingleNonEmptyString > 0){ |
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return strings[indexOfSingleNonEmptyString].toString(); |
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} |
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StringBuilder sb = new StringBuilder(length); |
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for (CharSequence charSequence : strings) { |
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sb.append(charSequence); |
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} |
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return sb.toString(); |
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} |
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//---------------------------------------------------------
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//
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