[COLLECTIONS-351] Remove EMPTY_LIST, EMPTY_SET and EMPTY_MAP.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1457540 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/collections/ListUtils.java

@@ -23,7 +23,6 @@ import java.util.Collections;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
-import java.util.Set;
 
 import org.apache.commons.collections.bag.HashBag;
 import org.apache.commons.collections.list.FixedSizeList;
@@ -40,13 +39,6 @@ import org.apache.commons.collections.list.UnmodifiableList;
  */
 public class ListUtils {
 
-    /**
-     * An empty unmodifiable list.
-     * This uses the {@link Collections Collections} implementation 
-     * and is provided for completeness.
-     */
-    public static final List<Object> EMPTY_LIST = Collections.<Object>emptyList();
-
     /**
      * <code>ListUtils</code> should not normally be instantiated.
      */

src/main/java/org/apache/commons/collections/MapUtils.java

@@ -76,12 +76,6 @@ import org.apache.commons.collections.map.UnmodifiableSortedMap;
  */
 public class MapUtils {
 
-    /**
-     * An empty unmodifiable map.
-     * This was not provided in JDK1.2.
-     */
-    public static final Map<Object, Object> EMPTY_MAP = UnmodifiableMap.unmodifiableMap(new HashMap<Object, Object>(1));
-
     /**
      * An empty unmodifiable sorted map.
      * This is not provided in the JDK.

src/main/java/org/apache/commons/collections/SetUtils.java

@@ -39,13 +39,6 @@ import org.apache.commons.collections.set.UnmodifiableSortedSet;
  */
 public class SetUtils {
 
-    /**
-     * An empty unmodifiable set.
-     * This uses the {@link Collections} implementation 
-     * and is provided for completeness.
-     */
-    public static final Set<?> EMPTY_SET = Collections.EMPTY_SET;
-
     /**
      * Get a typed empty unmodifiable Set.
      * @param <E> the element type