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Improve StringUtils.collectionToString()

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Use generics, and iterator and append(char) instead of append(String).
This commit is contained in:
Florian Schmaus 2015-07-14 13:40:23 +02:00
parent 57cc3aa3f8
commit 734695c80e
1 changed files with 16 additions and 9 deletions
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25
smack-core/src/main/java/org/jivesoftware/smack/util/StringUtils.java
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@ -19,6 +19,7 @@ package org.jivesoftware.smack.util;
import java.io.UnsupportedEncodingException; import java.io.UnsupportedEncodingException;
import java.util.Collection; import java.util.Collection;
import java.util.Iterator;
import java.util.Random; import java.util.Random;
/** /**
@ -221,16 +222,22 @@ public class StringUtils {
return cs.length() == 0; return cs.length() == 0;
} }
public static String collectionToString(Collection<String> collection) { /**
StringBuilder sb = new StringBuilder(); * Transform a collection of CharSequences to a whitespace delimited String.
for (String s : collection) { *
sb.append(s); * @param collection the collection to transform.
sb.append(" "); * @return a String with all the elements of the collection.
*/
public static String collectionToString(Collection<? extends CharSequence> collection) {
StringBuilder sb = new StringBuilder(collection.size() * 20);
for (Iterator<? extends CharSequence> it = collection.iterator(); it.hasNext();) {
CharSequence cs = it.next();
sb.append(cs);
if (it.hasNext()) {
sb.append(' ');
} }
String res = sb.toString(); }
// Remove the trailing whitespace return sb.toString();
res = res.substring(0, res.length() - 1);
return res;
} }
public static String returnIfNotEmptyTrimmed(String string) { public static String returnIfNotEmptyTrimmed(String string) {