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The module for FunctionalJ Core.
// ============================================================================
// Copyright (c) 2017-2021 Nawapunth Manusitthipol (NawaMan - http://nawaman.net).
// ----------------------------------------------------------------------------
// MIT License
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
// ============================================================================
package functionalj.stream.intstream;
import static functionalj.function.Func.f;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.PrimitiveIterator;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.IntBinaryOperator;
import java.util.stream.IntStream;
import java.util.stream.StreamSupport;
import functionalj.function.IntIntBiFunction;
import functionalj.function.IntObjBiFunction;
import functionalj.stream.IteratorPlus;
import functionalj.stream.StreamPlus;
import lombok.val;
public class IntStreamPlusHelper {
static final Object dummy = new Object();
public static boolean hasAt(IntStream stream, long index) {
return hasAt(stream, index, null);
}
public static boolean hasAt(IntStream stream, long index, int[][] valueRef) {
// Note: It is done this way to avoid interpreting 'null' as no-value
val ref = new int[1][];
stream
.skip (index)
.peek (value -> { ref[0] = new int[] { value }; })
.findFirst()
.orElse (-1);
val found = ref[0] != null;
valueRef[0] = ref[0];
return found;
}
//-- Terminal --
static TARGET terminate(
AsIntStreamPlus asStreamPlus,
Function action) {
val streamPlus = asStreamPlus.intStreamPlus();
try {
val stream = streamPlus.intStream();
val result = action.apply(stream);
return result;
} finally {
streamPlus.close();
}
}
static void terminate(
AsIntStreamPlus asStreamPlus,
Consumer action) {
val streamPlus = asStreamPlus.intStreamPlus();
try {
val stream = streamPlus.intStream();
action.accept(stream);
} finally {
streamPlus.close();
}
}
/** Run the given action sequentially, make sure to set the parallelity of the result back. */
static IntStreamPlus sequential(
AsIntStreamPlus asStreamPlus,
Function action) {
val streamPlus = asStreamPlus.intStreamPlus();
val isParallel = streamPlus.isParallel();
val orgIntStreamPlus = streamPlus.sequential();
val newIntStreamPlus = action.apply(orgIntStreamPlus);
if (newIntStreamPlus.isParallel() == isParallel)
return newIntStreamPlus;
if (isParallel)
return newIntStreamPlus.parallel();
return newIntStreamPlus.sequential();
}
/** Run the given action sequentially, make sure to set the parallelity of the result back. */
static IntStreamPlus sequentialToInt(
AsIntStreamPlus asStreamPlus,
Function action) {
return sequential(asStreamPlus, action);
}
/** Run the given action sequentially, make sure to set the parallelity of the result back. */
static StreamPlus sequentialToObj(
AsIntStreamPlus asStreamPlus,
Function> action) {
val streamPlus = asStreamPlus.intStreamPlus();
val isParallel = streamPlus.isParallel();
val orgIntStreamPlus = streamPlus.sequential();
val newIntStreamPlus = action.apply(orgIntStreamPlus);
if (newIntStreamPlus.isParallel() == isParallel)
return newIntStreamPlus;
if (isParallel)
return newIntStreamPlus.parallel();
return newIntStreamPlus.sequential();
}
static StreamPlus doZipIntWith(
IntObjBiFunction merger,
IntIteratorPlus iteratorA,
IteratorPlus iteratorB) {
val targetIterator = new Iterator() {
private boolean hasNextA;
private boolean hasNextB;
public boolean hasNext() {
hasNextA = iteratorA.hasNext();
hasNextB = iteratorB.hasNext();
return (hasNextA && hasNextB);
}
public TARGET next() {
if (!hasNextA)
throw new NoSuchElementException();
val nextA = iteratorA.nextInt();
val nextB = iteratorB.next();
return merger.apply(nextA, nextB);
}
};
val iterable = (Iterable)() -> targetIterator;
val spliterator = iterable.spliterator();
val targetStream = StreamPlus.from(StreamSupport.stream(spliterator, false));
targetStream.onClose(() -> {
f(iteratorA::close).runCarelessly();
f(iteratorB::close).runCarelessly();
});
return targetStream;
}
static StreamPlus doZipIntWith(
int defaultValue,
IntObjBiFunction merger,
IntIteratorPlus iteratorA,
IteratorPlus iteratorB) {
val targetIterator = new Iterator() {
private boolean hasNextA;
private boolean hasNextB;
public boolean hasNext() {
hasNextA = iteratorA.hasNext();
hasNextB = iteratorB.hasNext();
return hasNextA || hasNextB;
}
public TARGET next() {
val nextA = hasNextA ? iteratorA.nextInt() : defaultValue;
B nextB = hasNextB ? iteratorB.next() : null;
return merger.apply(nextA, nextB);
}
};
val iterable = (Iterable)() -> targetIterator;
val spliterator = iterable.spliterator();
val targetStream = StreamPlus.from(StreamSupport.stream(spliterator, false));
targetStream.onClose(() -> {
f(iteratorA::close).runCarelessly();
f(iteratorB::close).runCarelessly();
});
return targetStream;
}
static IntStreamPlus doZipIntIntWith(
IntBinaryOperator merger,
IntIteratorPlus iteratorA,
IntIteratorPlus iteratorB) {
val iterator = new PrimitiveIterator.OfInt() {
private boolean hasNextA;
private boolean hasNextB;
public boolean hasNext() {
hasNextA = iteratorA.hasNext();
hasNextB = iteratorB.hasNext();
return (hasNextA && hasNextB);
}
public int nextInt() {
if (hasNextA && hasNextB) {
val nextA = iteratorA.nextInt();
val nextB = iteratorB.nextInt();
val choice = merger.applyAsInt(nextA, nextB);
return choice;
}
throw new NoSuchElementException();
}
};
val targetIterator = IntIteratorPlus.from(iterator);
val iterable = (IntIterable)() -> targetIterator;
val spliterator = iterable.spliterator();
val targetStream = IntStreamPlus.from(StreamSupport.intStream(spliterator, false));
targetStream.onClose(() -> {
f(iteratorA::close).runCarelessly();
f(iteratorB::close).runCarelessly();
});
return targetStream;
}
static StreamPlus doZipIntIntObjWith(
IntIntBiFunction merger,
IntIteratorPlus iteratorA,
IntIteratorPlus iteratorB) {
val iterator = new Iterator() {
private boolean hasNextA;
private boolean hasNextB;
public boolean hasNext() {
hasNextA = iteratorA.hasNext();
hasNextB = iteratorB.hasNext();
return (hasNextA && hasNextB);
}
public TARGET next() {
if (hasNextA && hasNextB) {
val nextA = iteratorA.nextInt();
val nextB = iteratorB.nextInt();
TARGET choice = merger.applyInt(nextA, nextB);
return choice;
}
throw new NoSuchElementException();
}
};
val targetIterator = IteratorPlus.from(iterator);
val iterable = (Iterable)() -> targetIterator;
val spliterator = iterable.spliterator();
val targetStream = StreamPlus.from(StreamSupport.stream(spliterator, false));
targetStream.onClose(() -> {
f(iteratorA::close).runCarelessly();
f(iteratorB::close).runCarelessly();
});
return targetStream;
}
static StreamPlus doZipIntIntObjWith(
IntIntBiFunction merger,
IntIteratorPlus iteratorA,
IntIteratorPlus iteratorB,
int defaultValue) {
val iterator = new Iterator() {
private boolean hasNextA;
private boolean hasNextB;
public boolean hasNext() {
hasNextA = iteratorA.hasNext();
hasNextB = iteratorB.hasNext();
return (hasNextA || hasNextB);
}
public TARGET next() {
if (hasNextA && hasNextB) {
val nextA = iteratorA.nextInt();
val nextB = iteratorB.nextInt();
TARGET choice = merger.applyInt(nextA, nextB);
return choice;
}
if (hasNextA) {
val nextA = iteratorA.nextInt();
TARGET choice = merger.applyInt(nextA, defaultValue);
return choice;
}
if (hasNextB) {
val nextB = iteratorB.nextInt();
TARGET choice = merger.applyInt(defaultValue, nextB);
return choice;
}
throw new NoSuchElementException();
}
};
val targetIterator = IteratorPlus.from(iterator);
val iterable = (Iterable)() -> targetIterator;
val targetStream = StreamPlus.from(StreamSupport.stream(iterable.spliterator(), false));
targetStream.onClose(() -> {
f(iteratorA::close).runCarelessly();
f(iteratorB::close).runCarelessly();
});
return targetStream;
}
static IntStreamPlus doZipIntIntWith(
IntBinaryOperator merger,
IntIteratorPlus iteratorA,
IntIteratorPlus iteratorB,
int defaultValue) {
val iterator = new PrimitiveIterator.OfInt() {
private boolean hasNextA;
private boolean hasNextB;
public boolean hasNext() {
hasNextA = iteratorA.hasNext();
hasNextB = iteratorB.hasNext();
return (hasNextA || hasNextB);
}
public int nextInt() {
if (hasNextA && hasNextB) {
val nextA = iteratorA.nextInt();
val nextB = iteratorB.nextInt();
val choice = merger.applyAsInt(nextA, nextB);
return choice;
}
if (hasNextA) {
val nextA = iteratorA.nextInt();
val choice = merger.applyAsInt(nextA, defaultValue);
return choice;
}
if (hasNextB) {
val nextB = iteratorB.nextInt();
val choice = merger.applyAsInt(defaultValue, nextB);
return choice;
}
throw new NoSuchElementException();
}
};
val targetIterator = IntIteratorPlus.from(iterator);
val iterable = (IntIterable)() -> targetIterator;
val spliterator = iterable.spliterator();
val targetStream = IntStreamPlus.from(StreamSupport.intStream(spliterator, false));
targetStream.onClose(() -> {
f(iteratorA::close).runCarelessly();
f(iteratorB::close).runCarelessly();
});
return targetStream;
}
static StreamPlus doZipIntIntObjWith(
IntIntBiFunction merger,
IntIteratorPlus iteratorA,
IntIteratorPlus iteratorB,
int defaultValueA,
int defaultValueB) {
val iterator = new Iterator() {
private boolean hasNextA;
private boolean hasNextB;
public boolean hasNext() {
hasNextA = iteratorA.hasNext();
hasNextB = iteratorB.hasNext();
return (hasNextA || hasNextB);
}
public TARGET next() {
if (hasNextA && hasNextB) {
val nextA = iteratorA.nextInt();
val nextB = iteratorB.nextInt();
TARGET choice = merger.applyInt(nextA, nextB);
return choice;
}
if (hasNextA) {
val nextA = iteratorA.nextInt();
TARGET choice = merger.applyInt(nextA, defaultValueB);
return choice;
}
if (hasNextB) {
val nextB = iteratorB.nextInt();
TARGET choice = merger.applyInt(defaultValueA, nextB);
return choice;
}
throw new NoSuchElementException();
}
};
val targetIterator = IteratorPlus.from(iterator);
val iterable = (Iterable)() -> targetIterator;
val spliterator = iterable.spliterator();
val targetStream = StreamPlus.from(StreamSupport.stream(spliterator, false));
targetStream.onClose(() -> {
f(iteratorA::close).runCarelessly();
f(iteratorB::close).runCarelessly();
});
return targetStream;
}
static IntStreamPlus doZipIntIntWith(
IntBinaryOperator merger,
IntIteratorPlus iteratorA,
IntIteratorPlus iteratorB,
int defaultValueA,
int defaultValueB) {
val iterator = new PrimitiveIterator.OfInt() {
private boolean hasNextA;
private boolean hasNextB;
public boolean hasNext() {
hasNextA = iteratorA.hasNext();
hasNextB = iteratorB.hasNext();
return (hasNextA || hasNextB);
}
public int nextInt() {
if (hasNextA && hasNextB) {
val nextA = iteratorA.nextInt();
val nextB = iteratorB.nextInt();
val choice = merger.applyAsInt(nextA, nextB);
return choice;
}
if (hasNextA) {
val nextA = iteratorA.nextInt();
val choice = merger.applyAsInt(nextA, defaultValueB);
return choice;
}
if (hasNextB) {
val nextB = iteratorB.nextInt();
val choice = merger.applyAsInt(defaultValueA, nextB);
return choice;
}
throw new NoSuchElementException();
}
};
val targetIterator = IntIteratorPlus.from(iterator);
val iterable = (IntIterable)() -> targetIterator;
val spliterator = iterable.spliterator();
val targetStream = IntStreamPlus.from(StreamSupport.intStream(spliterator, false));
targetStream.onClose(() -> {
f(iteratorA::close).runCarelessly();
f(iteratorB::close).runCarelessly();
});
return targetStream;
}
static IntStreamPlus doMergeInt(
IntIteratorPlus iteratorA,
IntIteratorPlus iteratorB) {
val iterator = new IntIteratorPlus() {
private boolean isA = true;
public boolean hasNext() {
if (isA) {
if (iteratorA.hasNext()) return true;
isA = false;
if (iteratorB.hasNext()) return true;
return false;
}
if (iteratorB.hasNext()) return true;
isA = true;
if (iteratorA.hasNext()) return true;
return false;
}
public int nextInt() {
val next = isA ? iteratorA.next() : iteratorB.next();
isA = !isA;
return next;
}
@Override
public OfInt asIterator() {
return this;
}
};
val iterable = (IntIterable)() -> iterator;
val spliterator = iterable.spliterator();
val targetStream = IntStreamPlus.from(StreamSupport.intStream(spliterator, false));
targetStream.onClose(() -> {
f(iterator::close).runCarelessly();
f(iteratorA::close).runCarelessly();
f(iteratorB::close).runCarelessly();
});
return targetStream;
}
}