Package org.openxava.util

Class XCollections

  • public class XCollections
extends java.lang.Object
    Utilities to work with collections, enumerations and iterators.

    Author:
    Javier Paniza

    • Constructor Summary

      Constructors 
      Constructor Description
      XCollections()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static void add​(java.util.Collection collection, java.util.Enumeration toAdd)
      Adds elements from the enumeration to the collection.
      static boolean isEmptyOrZero​(java.util.Collection values)
      It's empty if is null, without elements, with null elements or elements with neutral value (empty strings, collections, nulls or zeroes).
      static java.lang.Object last​(java.util.Collection collection)
      Returns the last element of sent collection.
      static void move​(java.util.List list, int from, int to)  
      static void println​(java.util.Collection c)
      Print in standard output the collection elements.
      static void println​(java.util.Iterator it)
      Print in standard output the elements by it iterate.
      static java.util.Collection toCollection​(java.util.Enumeration e)
      Returns a collection from a enumeration.
      static java.util.List toList​(java.lang.Iterable it)
      Returns a List from an Iterable.
      static java.lang.String[] toStringArray​(java.util.Collection c)
      Returns a String [] from a collection of Strings.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • XCollections

        public XCollections()

    • Method Detail

      • last

        public static java.lang.Object last​(java.util.Collection collection)
        Returns the last element of sent collection.

        Parameters:
        collection - Can be null
        Returns:
        Last element, or null if collection is null or empty.

      • add

        public static void add​(java.util.Collection collection,
                       java.util.Enumeration toAdd)
        Adds elements from the enumeration to the collection.

        Parameters:
        collection - Not null
        toAdd - If null no elements are added.

      • println

        public static void println​(java.util.Collection c)
        Print in standard output the collection elements.

        Util to debug.

        Parameters:
        c - Can be null.

      • println

        public static void println​(java.util.Iterator it)
        Print in standard output the elements by it iterate.

        Util to debug.

        Parameters:
        c - Can be null.

      • toCollection

        public static java.util.Collection toCollection​(java.util.Enumeration e)
        Returns a collection from a enumeration.

        Parameters:
        e - If null then returns a empty collection.
        Returns:
        Not null.

      • toList

        public static java.util.List toList​(java.lang.Iterable it)
        Returns a List from an Iterable.

        Parameters:
        it - If null then returns a empty list.
        Returns:
        Not null.
        Since:
        5.6.1

      • toStringArray

        public static java.lang.String[] toStringArray​(java.util.Collection c)
        Returns a String [] from a collection of Strings.

        Parameters:
        c - Elements must be of type String. If null then returns a empty array.
        Returns:
        Not null.

      • move

        public static void move​(java.util.List list,
                        int from,
                        int to)
        Since:
        5.2

      • isEmptyOrZero

        public static boolean isEmptyOrZero​(java.util.Collection values)
        It's empty if is null, without elements, with null elements or elements with neutral value (empty strings, collections, nulls or zeroes). Mirrors Maps.isEmptyOrZero(Map) semantics for collections. Numeric values with value 0 are considered empty.
        Parameters:
        values - Can be null.
        Since:
        7.6