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keep internal inEmpty() calls for optimization purposes lazy

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GitOrigin-RevId: 4af1d4b261cd814a353c9a895544d5bbc50c991b
This commit is contained in:
Eugene Zhuravlev
2020-12-09 09:45:56 +00:00
committed by intellij-monorepo-bot
parent 93ee849ad8
commit e37e0678e5
1 changed files with 12 additions and 11 deletions
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jps/jps-builders-6/src/org/jetbrains/jps/javac/Iterators.java
+12 -11
View File
@@ -19,10 +19,11 @@ public class Iterators {
};
public static boolean isEmpty(Iterable<?> iterable) {
if (iterable instanceof Collection) {
return ((Collection<?>)iterable).isEmpty();
}
return iterable == null || !iterable.iterator().hasNext();
return isEmptyCollection(iterable) || !iterable.iterator().hasNext();
}
private static boolean isEmptyCollection(Iterable<?> iterable) {
return iterable == null || iterable instanceof Collection && ((Collection<?>)iterable).isEmpty();
}
public static <T> boolean contains(Iterable<? extends T> iterable, T obj) {
@@ -48,10 +49,10 @@ public class Iterators {
@SuppressWarnings("unchecked")
public static <T> Iterable<T> flat(final Iterable<? extends T> first, final Iterable<? extends T> second) {
if (isEmpty(first)) {
return isEmpty(second)? Collections.<T>emptyList() : (Iterable<T>)second;
if (isEmptyCollection(first)) {
return isEmptyCollection(second)? Collections.<T>emptyList() : (Iterable<T>)second;
}
if (isEmpty(second)) {
if (isEmptyCollection(second)) {
return (Iterable<T>)first;
}
return new Iterable<T>() {
@@ -88,7 +89,7 @@ public class Iterators {
}
public static <T> Iterable<T> flat(final Iterable<? extends Iterable<? extends T>> parts) {
return isEmpty(parts)? Collections.<T>emptyList() : new Iterable<T>() {
return isEmptyCollection(parts)? Collections.<T>emptyList() : new Iterable<T>() {
@NotNull
@Override
public Iterator<T> iterator() {
@@ -168,7 +169,7 @@ public class Iterators {
}
public static <I,O> Iterable<O> map(final Iterable<? extends I> from, final Function<? super I, ? extends O> mapper) {
return isEmpty(from)? Collections.<O>emptyList() : new Iterable<O>() {
return isEmptyCollection(from)? Collections.<O>emptyList() : new Iterable<O>() {
@NotNull
@Override
public Iterator<O> iterator() {
@@ -192,7 +193,7 @@ public class Iterators {
}
public static <T> Iterable<T> filter(final Iterable<? extends T> it, final BooleanFunction<? super T> predicate) {
return isEmpty(it)? Collections.<T>emptyList() : new Iterable<T>() {
return isEmptyCollection(it)? Collections.<T>emptyList() : new Iterable<T>() {
@NotNull
@Override
public Iterator<T> iterator() {
@@ -247,7 +248,7 @@ public class Iterators {
}
public static <T> Iterable<T> filterWithOrder(final Iterable<? extends T> from, final Iterable<BooleanFunction<? super T>> predicates) {
return isEmpty(predicates) || isEmpty(from)? Collections.<T>emptyList() : new Iterable<T>() {
return isEmptyCollection(predicates) || isEmptyCollection(from)? Collections.<T>emptyList() : new Iterable<T>() {
@NotNull
@Override
public Iterator<T> iterator() {