Join.java

package org.robolectric.util;

import java.util.Collection;

/**
 * Utility class used to join strings together with a delimiter.
 */
public class Join {
  public static String join(String delimiter, Collection collection) {
    String del = "";
    StringBuilder sb = new StringBuilder();
    for (Object obj : collection) {
      String asString = obj == null ? null : obj.toString();
      if (obj != null && asString.length() > 0) {
        sb.append(del).append(obj);
        del = delimiter;
      }
    }
    return sb.toString();
  }

  public static String join(String delimiter, Object... collection) {
    String del = "";
    StringBuilder sb = new StringBuilder();
    for (Object obj : collection) {
      String asString = obj == null ? null : obj.toString();
      if (asString != null && asString.length() > 0) {
        sb.append(del).append(asString);
        del = delimiter;
      }
    }
    return sb.toString();
  }
}