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Document and fix some unchecked casts 

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1436053 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Sebastian Bazley 2013-01-21 01:15:51 +00:00
parent 550d30609f
commit bac08c04d4
1 changed files with 6 additions and 8 deletions
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14
src/main/java/org/apache/commons/collections/CollectionUtils.java
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@ -132,7 +132,7 @@ public class CollectionUtils {
* @param <T> the element type
* @return immutable empty collection
*/
@SuppressWarnings("unchecked")
@SuppressWarnings("unchecked") // OK, empty collection is compatible with any type
public static <T> Collection<T> emptyCollection() {
return EMPTY_COLLECTION;
}
@ -145,7 +145,7 @@ public class CollectionUtils {
* @param collection the collection, possibly <code>null</code>
* @return an empty collection if the argument is <code>null</code>
*/
@SuppressWarnings("unchecked")
@SuppressWarnings("unchecked") // OK, empty collection is compatible with any type
public static <T> Collection<T> emptyIfNull(final Collection<T> collection) {
return collection == null ? EMPTY_COLLECTION : collection;
}
@ -1205,8 +1205,7 @@ public class CollectionUtils {
* @return true if the BoundedCollection is full
* @throws NullPointerException if the collection is null
*/
@SuppressWarnings("unchecked")
public static boolean isFull(final Collection<?> coll) {
public static boolean isFull(final Collection<? extends Object> coll) {
if (coll == null) {
throw new NullPointerException("The collection must not be null");
}
@ -1215,7 +1214,7 @@ public class CollectionUtils {
}
try {
final BoundedCollection<?> bcoll =
UnmodifiableBoundedCollection.unmodifiableBoundedCollection((Collection<Object>) coll);
UnmodifiableBoundedCollection.unmodifiableBoundedCollection(coll);
return bcoll.isFull();
} catch (final IllegalArgumentException ex) {
return false;
@ -1237,8 +1236,7 @@ public class CollectionUtils {
* @return the maximum size of the BoundedCollection, -1 if no maximum size
* @throws NullPointerException if the collection is null
*/
@SuppressWarnings("unchecked")
public static int maxSize(final Collection<?> coll) {
public static int maxSize(final Collection<? extends Object> coll) {
if (coll == null) {
throw new NullPointerException("The collection must not be null");
}
@ -1247,7 +1245,7 @@ public class CollectionUtils {
}
try {
final BoundedCollection<?> bcoll =
UnmodifiableBoundedCollection.unmodifiableBoundedCollection((Collection<Object>) coll);
UnmodifiableBoundedCollection.unmodifiableBoundedCollection(coll);
return bcoll.maxSize();
} catch (final IllegalArgumentException ex) {
return -1;