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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 33101] New: - add generic length function to ArrayUtils, for object.getClass().isArray()
Date Fri, 14 Jan 2005 17:12:44 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=33101

           Summary: add generic length function to ArrayUtils, for
                    object.getClass().isArray()
           Product: Commons
           Version: unspecified
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Lang
        AssignedTo: commons-dev@jakarta.apache.org
        ReportedBy: vive_lafrique@yahoo.com


This method will calculate the length of any Array object, on the condition that
object.getClass().isArray() is true:

  public static int length(Object array) {
    if (array == null)
      throw new NullPointerException("May not pass in null");
    if (!array.getClass().isArray())
      throw new IllegalArgumentException("You may only get the generic length of
an array if you pass in an array");
    if (array instanceof int[])
      return ((int[])array).length;
    else if (array instanceof short[])
      return ((short[])array).length;
    else if (array instanceof byte[])
      return ((byte[])array).length;
    else if (array instanceof boolean[])
      return ((boolean[])array).length;
    else if (array instanceof long[])
      return ((long[])array).length;
    else if (array instanceof char[])
      return ((char[])array).length;
    else if (array instanceof double[])
      return ((double[])array).length;
    else if (array instanceof float[])
      return ((float[])array).length;
    else if (array instanceof Object[])
      return ((Object[])array).length;
    else //Not reachable strictly.
      throw new IllegalArgumentException("Unknown type");
 
  }

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