Java: Add more stream functions. Comment methods out, where we are not happy with the generated result.

java/ql/test/utils/model-generator/typebasedflow/p/Stream.java

@@ -1,8 +1,8 @@
 package p;
 
+import java.util.*;
 import java.util.function.*;
-import java.util.Iterator;
-import java.util.stream.Collector;
+import java.util.stream.*;
 
 public class Stream<T> {
 
@@ -19,9 +19,9 @@ public class Stream<T> {
     }
 
     // Collector is not a functional interface, so this is not supported
-    // public <R, A> R collect(Collector<? super T, A, R> collector) {
-    // throw null;
-    // }
+    public <R, A> R collect(Collector<? super T, A, R> collector) {
+        throw null;
+    }
 
     public static <T> Stream<T> concat(Stream<? extends T> a, Stream<? extends T> b) {
         throw null;
@@ -30,4 +30,145 @@ public class Stream<T> {
     public Stream<T> distinct() {
         throw null;
     }
+
+    public static <T> Stream<T> empty() {
+        throw null;
+    }
+
+    public Stream<T> filter(Predicate<? super T> predicate) {
+        throw null;
+    }
+
+    public Optional<T> findAny() {
+        throw null;
+    }
+
+    public Optional<T> findFirst() {
+        throw null;
+    }
+
+    // public <R> Stream<R> flatMap(Function<? super T, ? extends Stream<? extends
+    // R>> mapper) {
+    // throw null;
+    // }
+
+    public DoubleStream flatMapToDouble(Function<? super T, ? extends DoubleStream> mapper) {
+        throw null;
+    }
+
+    public IntStream flatMapToInt(Function<? super T, ? extends IntStream> mapper) {
+        throw null;
+    }
+
+    public LongStream flatMapToLong(Function<? super T, ? extends LongStream> mapper) {
+        throw null;
+    }
+
+    public void forEach(Consumer<? super T> action) {
+        throw null;
+    }
+
+    public void forEachOrdered(Consumer<? super T> action) {
+        throw null;
+    }
+
+    // Issue with model generator. Return value is not correctly identified as a
+    // collection like type.
+    // public static <T> Stream<T> generate(Supplier<T> s) {
+    // throw null;
+    // }
+
+    // Issue with model generator. Return value is not correctly identified as a
+    // collection like type.
+    // public static <T> Stream<T> iterate(T seed, UnaryOperator<T> f) {
+    // throw null;
+    // }
+
+    public Stream<T> limit(long maxSize) {
+        throw null;
+    }
+
+    // Issue with model generator. Return value is not correctly identified as a
+    // collection like type and also the type parameter is not correctly identified.
+    // public <R> Stream<R> map(Function<? super T, ? extends R> mapper) {
+    // throw null;
+    // }
+
+    public DoubleStream mapToDouble(ToDoubleFunction<? super T> mapper) {
+        throw null;
+    }
+
+    public IntStream mapToInt(ToIntFunction<? super T> mapper) {
+        throw null;
+    }
+
+    public LongStream mapToLong(ToLongFunction<? super T> mapper) {
+        throw null;
+    }
+
+    public Optional<T> max(Comparator<? super T> comparator) {
+        throw null;
+    }
+
+    public Optional<T> min(Comparator<? super T> comparator) {
+        throw null;
+    }
+
+    public boolean noneMatch(Predicate<? super T> predicate) {
+        throw null;
+    }
+
+    // Issue with model generator. ... is not supported.
+    // public static <T> Stream<T> of(T... t) {
+    // throw null;
+    // }
+
+    // Issue with model generator. Return value is not correctly identified as a
+    // collection like type and also the type parameter is not correctly identified.
+    // public static <T> Stream<T> of(T t) {
+    // throw null;
+    // }
+
+    public Stream<T> peek(Consumer<? super T> action) {
+        throw null;
+    }
+
+    // Model generator yields a couple of extra results as models are generated for
+    // writing to the stream.
+    public Optional<T> reduce(BinaryOperator<T> accumulator) {
+        throw null;
+    }
+
+    // Model generator yields a couple of extra results as models are generated for
+    // writing to the stream.
+    public T reduce(T identity, BinaryOperator<T> accumulator) {
+        throw null;
+    }
+
+    public <U> U reduce(U identity, BiFunction<U, ? super T, U> accumulator, BinaryOperator<U> combiner) {
+        throw null;
+    }
+
+    public Stream<T> skip(long n) {
+        throw null;
+    }
+
+    public Stream<T> sorted() {
+        throw null;
+    }
+
+    public Stream<T> sorted(Comparator<? super T> comparator) {
+        throw null;
+    }
+
+    // Models can never be generated correctly based on the type information
+    // as it involves downcasting.
+    public Object[] toArray() {
+        throw null;
+    }
+
+    // Issue with model generator - no models are generated.
+    // public <A> A[] toArray(IntFunction<A[]> generator) {
+    // throw null;
+    // }
 }