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revert: ContainerUtil.unmodifiableOrEmpty* methods optimized for 1-element collections

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Creating a new singleton collection might break comparison policy of the original collection.

(original commit e66890a6d2)

GitOrigin-RevId: b4092dc49b60881385f31553ffd504e59e483e41
This commit is contained in:
Anton Makeev
2019-07-02 06:52:16 +03:00
committed by intellij-monorepo-bot
parent a117e7858e
commit 5b18e1cafe
1 changed files with 1 additions and 16 deletions
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platform/util/src/com/intellij/util/containers/ContainerUtil.java
+1 -16
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@@ -260,9 +260,6 @@ public class ContainerUtil extends ContainerUtilRt {
if (size == 0) {
return emptyList();
}
if (size == 1) {
return Collections.singletonList(original.iterator().next());
}
return Collections.unmodifiableCollection(original);
}
@@ -273,9 +270,6 @@ public class ContainerUtil extends ContainerUtilRt {
if (size == 0) {
return emptyList();
}
if (size == 1) {
return Collections.singletonList(original.iterator().next());
}
return Collections.unmodifiableList(original);
}
@@ -286,9 +280,6 @@ public class ContainerUtil extends ContainerUtilRt {
if (size == 0) {
return Collections.emptySet();
}
if (size == 1) {
return Collections.singleton(original.iterator().next());
}
return Collections.unmodifiableSet(original);
}
@@ -299,13 +290,7 @@ public class ContainerUtil extends ContainerUtilRt {
if (size == 0) {
return Collections.emptyMap();
}
if (size == 1) {
Map.Entry<? extends K, ? extends V> entry = original.entrySet().iterator().next();
return Collections.singletonMap(entry.getKey(), entry.getValue());
}
else {
return Collections.unmodifiableMap(original);
}
return Collections.unmodifiableMap(original);
}
@NotNull