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A general programming library in Java
/*
* Copyright (C) 2016 HaiYang Li
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
*/
package com.landawn.abacus.util.stream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
import com.landawn.abacus.util.DoubleIterator;
import com.landawn.abacus.util.DoubleList;
import com.landawn.abacus.util.DoubleSummaryStatistics;
import com.landawn.abacus.util.FloatIterator;
import com.landawn.abacus.util.IntIterator;
import com.landawn.abacus.util.LongIterator;
import com.landawn.abacus.util.LongMultiset;
import com.landawn.abacus.util.Multimap;
import com.landawn.abacus.util.Multiset;
import com.landawn.abacus.util.N;
import com.landawn.abacus.util.OptionalDouble;
import com.landawn.abacus.util.function.BiConsumer;
import com.landawn.abacus.util.function.BiFunction;
import com.landawn.abacus.util.function.BinaryOperator;
import com.landawn.abacus.util.function.Consumer;
import com.landawn.abacus.util.function.DoubleBinaryOperator;
import com.landawn.abacus.util.function.DoubleConsumer;
import com.landawn.abacus.util.function.DoubleFunction;
import com.landawn.abacus.util.function.DoublePredicate;
import com.landawn.abacus.util.function.DoubleToFloatFunction;
import com.landawn.abacus.util.function.DoubleToIntFunction;
import com.landawn.abacus.util.function.DoubleToLongFunction;
import com.landawn.abacus.util.function.DoubleUnaryOperator;
import com.landawn.abacus.util.function.ObjDoubleConsumer;
import com.landawn.abacus.util.function.Supplier;
/**
* This class is a sequential, stateful and immutable stream implementation.
*
* @since 0.8
*
* @author Haiyang Li
*/
class ArrayDoubleStream extends AbstractDoubleStream {
final double[] elements;
final int fromIndex;
final int toIndex;
ArrayDoubleStream(final double[] values) {
this(values, 0, values.length);
}
ArrayDoubleStream(final double[] values, final Collection closeHandlers) {
this(values, 0, values.length, closeHandlers);
}
ArrayDoubleStream(final double[] values, final Collection closeHandlers, final boolean sorted) {
this(values, 0, values.length, closeHandlers, sorted);
}
ArrayDoubleStream(final double[] values, final int fromIndex, final int toIndex) {
this(values, fromIndex, toIndex, null);
}
ArrayDoubleStream(final double[] values, final int fromIndex, final int toIndex, final Collection closeHandlers) {
this(values, fromIndex, toIndex, closeHandlers, false);
}
ArrayDoubleStream(final double[] values, final int fromIndex, final int toIndex, final Collection closeHandlers, final boolean sorted) {
super(closeHandlers, sorted);
checkFromToIndex(fromIndex, toIndex, values.length);
this.elements = values;
this.fromIndex = fromIndex;
this.toIndex = toIndex;
}
@Override
public DoubleStream filter(final DoublePredicate predicate) {
return new IteratorDoubleStream(new ExDoubleIterator() {
private boolean hasNext = false;
private int cursor = fromIndex;
@Override
public boolean hasNext() {
if (hasNext == false && cursor < toIndex) {
do {
if (predicate.test(elements[cursor])) {
hasNext = true;
break;
}
} while (++cursor < toIndex);
}
return hasNext;
}
@Override
public double nextDouble() {
if (hasNext == false && hasNext() == false) {
throw new NoSuchElementException();
}
hasNext = false;
return elements[cursor++];
}
}, closeHandlers, sorted);
}
@Override
public DoubleStream takeWhile(final DoublePredicate predicate) {
return new IteratorDoubleStream(new ExDoubleIterator() {
private boolean hasMore = true;
private boolean hasNext = false;
private int cursor = fromIndex;
@Override
public boolean hasNext() {
if (hasNext == false && hasMore && cursor < toIndex) {
if (predicate.test(elements[cursor])) {
hasNext = true;
} else {
hasMore = false;
}
}
return hasNext;
}
@Override
public double nextDouble() {
if (hasNext == false && hasNext() == false) {
throw new NoSuchElementException();
}
hasNext = false;
return elements[cursor++];
}
}, closeHandlers, sorted);
}
@Override
public DoubleStream dropWhile(final DoublePredicate predicate) {
return new IteratorDoubleStream(new ExDoubleIterator() {
private boolean hasNext = false;
private int cursor = fromIndex;
private boolean dropped = false;
@Override
public boolean hasNext() {
if (hasNext == false && cursor < toIndex) {
if (dropped == false) {
do {
if (predicate.test(elements[cursor]) == false) {
hasNext = true;
break;
}
} while (++cursor < toIndex);
dropped = true;
} else {
hasNext = true;
}
}
return hasNext;
}
@Override
public double nextDouble() {
if (hasNext == false && hasNext() == false) {
throw new NoSuchElementException();
}
hasNext = false;
return elements[cursor++];
}
}, closeHandlers, sorted);
}
@Override
public DoubleStream map(final DoubleUnaryOperator mapper) {
return new IteratorDoubleStream(new ExDoubleIterator() {
int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public double nextDouble() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
return mapper.applyAsDouble(elements[cursor++]);
}
@Override
public long count() {
return toIndex - cursor;
}
@Override
public void skip(long n) {
cursor = n < toIndex - cursor ? cursor + (int) n : toIndex;
}
@Override
public double[] toArray() {
final double[] a = new double[toIndex - cursor];
for (int i = 0, len = toIndex - cursor; i < len; i++) {
a[i] = mapper.applyAsDouble(elements[cursor++]);
}
return a;
}
}, closeHandlers);
}
@Override
public IntStream mapToInt(final DoubleToIntFunction mapper) {
return new IteratorIntStream(new ExIntIterator() {
int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public int nextInt() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
return mapper.applyAsInt(elements[cursor++]);
}
@Override
public long count() {
return toIndex - cursor;
}
@Override
public void skip(long n) {
cursor = n < toIndex - cursor ? cursor + (int) n : toIndex;
}
@Override
public int[] toArray() {
final int[] a = new int[toIndex - cursor];
for (int i = 0, len = toIndex - cursor; i < len; i++) {
a[i] = mapper.applyAsInt(elements[cursor++]);
}
return a;
}
}, closeHandlers);
}
@Override
public LongStream mapToLong(final DoubleToLongFunction mapper) {
return new IteratorLongStream(new ExLongIterator() {
int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public long nextLong() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
return mapper.applyAsLong(elements[cursor++]);
}
@Override
public long count() {
return toIndex - cursor;
}
@Override
public void skip(long n) {
cursor = n < toIndex - cursor ? cursor + (int) n : toIndex;
}
@Override
public long[] toArray() {
final long[] a = new long[toIndex - cursor];
for (int i = 0, len = toIndex - cursor; i < len; i++) {
a[i] = mapper.applyAsLong(elements[cursor++]);
}
return a;
}
}, closeHandlers);
}
@Override
public FloatStream mapToFloat(final DoubleToFloatFunction mapper) {
return new IteratorFloatStream(new ExFloatIterator() {
int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public float nextFloat() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
return mapper.applyAsFloat(elements[cursor++]);
}
@Override
public long count() {
return toIndex - cursor;
}
@Override
public void skip(long n) {
cursor = n < toIndex - cursor ? cursor + (int) n : toIndex;
}
@Override
public float[] toArray() {
final float[] a = new float[toIndex - cursor];
for (int i = 0, len = toIndex - cursor; i < len; i++) {
a[i] = mapper.applyAsFloat(elements[cursor++]);
}
return a;
}
}, closeHandlers);
}
@Override
public Stream mapToObj(final DoubleFunction mapper) {
return new IteratorStream(new ExIterator() {
int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public U next() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
return mapper.apply(elements[cursor++]);
}
@Override
public long count() {
return toIndex - cursor;
}
@Override
public void skip(long n) {
cursor = n < toIndex - cursor ? cursor + (int) n : toIndex;
}
@Override
public A[] toArray(A[] a) {
a = a.length >= toIndex - cursor ? a : (A[]) N.newArray(a.getClass().getComponentType(), toIndex - cursor);
for (int i = 0, len = toIndex - cursor; i < len; i++) {
a[i] = (A) mapper.apply(elements[cursor++]);
}
return a;
}
}, closeHandlers);
}
@Override
public DoubleStream flatMap(final DoubleFunction mapper) {
return new IteratorDoubleStream(new ExDoubleIterator() {
private int cursor = fromIndex;
private DoubleIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && cursor < toIndex) {
cur = mapper.apply(elements[cursor++]).exIterator();
}
return cur != null && cur.hasNext();
}
@Override
public double nextDouble() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextDouble();
}
}, closeHandlers);
}
@Override
public IntStream flatMapToInt(final DoubleFunction mapper) {
return new IteratorIntStream(new ExIntIterator() {
private int cursor = fromIndex;
private IntIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && cursor < toIndex) {
cur = mapper.apply(elements[cursor++]).exIterator();
}
return cur != null && cur.hasNext();
}
@Override
public int nextInt() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextInt();
}
}, closeHandlers);
}
@Override
public LongStream flatMapToLong(final DoubleFunction mapper) {
return new IteratorLongStream(new ExLongIterator() {
private int cursor = fromIndex;
private LongIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && cursor < toIndex) {
cur = mapper.apply(elements[cursor++]).exIterator();
}
return cur != null && cur.hasNext();
}
@Override
public long nextLong() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextLong();
}
}, closeHandlers);
}
@Override
public FloatStream flatMapToFloat(final DoubleFunction mapper) {
return new IteratorFloatStream(new ExFloatIterator() {
private int cursor = fromIndex;
private FloatIterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && cursor < toIndex) {
cur = mapper.apply(elements[cursor++]).exIterator();
}
return cur != null && cur.hasNext();
}
@Override
public float nextFloat() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextFloat();
}
}, closeHandlers);
}
@Override
public Stream flatMapToObj(final DoubleFunction> mapper) {
return new IteratorStream(new ExIterator() {
private int cursor = fromIndex;
private Iterator cur = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && cursor < toIndex) {
cur = mapper.apply(elements[cursor++]).iterator();
}
return cur != null && cur.hasNext();
}
@Override
public T next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.next();
}
}, closeHandlers);
}
@Override
public Stream split(final int size) {
N.checkArgument(size > 0, "'size' must be bigger than 0");
return new IteratorStream(new ExIterator() {
private int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public DoubleStream next() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
return new ArrayDoubleStream(elements, cursor, (cursor = size < toIndex - cursor ? cursor + size : toIndex), null, sorted);
}
}, closeHandlers);
}
@Override
public Stream splitToList(final int size) {
N.checkArgument(size > 0, "'size' must be bigger than 0");
return new IteratorStream(new ExIterator() {
private int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public DoubleList next() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
return new DoubleList(N.copyOfRange(elements, cursor, (cursor = size < toIndex - cursor ? cursor + size : toIndex)));
}
}, closeHandlers);
}
@Override
public Stream split(final DoublePredicate predicate) {
return new IteratorStream(new ExIterator() {
private int cursor = fromIndex;
private boolean preCondition = false;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public DoubleStream next() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
final int from = cursor;
while (cursor < toIndex) {
if (from == cursor) {
preCondition = predicate.test(elements[from]);
cursor++;
} else if (predicate.test(elements[cursor]) == preCondition) {
cursor++;
} else {
break;
}
}
return new ArrayDoubleStream(elements, from, cursor, null, sorted);
}
}, closeHandlers);
}
@Override
public Stream splitToList(final DoublePredicate predicate) {
return new IteratorStream(new ExIterator() {
private int cursor = fromIndex;
private boolean preCondition = false;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public DoubleList next() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
final int from = cursor;
while (cursor < toIndex) {
if (from == cursor) {
preCondition = predicate.test(elements[from]);
cursor++;
} else if (predicate.test(elements[cursor]) == preCondition) {
cursor++;
} else {
break;
}
}
return new DoubleList(N.copyOfRange(elements, from, cursor));
}
}, closeHandlers);
}
@Override
public Stream split(final U identity, final BiFunction predicate,
final Consumer identityUpdate) {
return new IteratorStream(new ExIterator() {
private int cursor = fromIndex;
private boolean preCondition = false;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public DoubleStream next() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
final int from = cursor;
while (cursor < toIndex) {
if (from == cursor) {
preCondition = predicate.apply(elements[from], identity);
cursor++;
} else if (predicate.apply(elements[cursor], identity) == preCondition) {
cursor++;
} else {
if (identityUpdate != null) {
identityUpdate.accept(identity);
}
break;
}
}
return new ArrayDoubleStream(elements, from, cursor, null, sorted);
}
}, closeHandlers);
}
@Override
public Stream splitToList(final U identity, final BiFunction predicate,
final Consumer identityUpdate) {
return new IteratorStream(new ExIterator() {
private int cursor = fromIndex;
private boolean preCondition = false;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public DoubleList next() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
final int from = cursor;
while (cursor < toIndex) {
if (from == cursor) {
preCondition = predicate.apply(elements[from], identity);
cursor++;
} else if (predicate.apply(elements[cursor], identity) == preCondition) {
cursor++;
} else {
if (identityUpdate != null) {
identityUpdate.accept(identity);
}
break;
}
}
return new DoubleList(N.copyOfRange(elements, from, cursor));
}
}, closeHandlers);
}
@Override
public Stream splitAt(final int n) {
if (n < 0) {
throw new IllegalArgumentException("'n' can't be negative");
}
final DoubleStream[] a = new DoubleStream[2];
final int middleIndex = n < toIndex - fromIndex ? fromIndex + n : toIndex;
a[0] = middleIndex == fromIndex ? DoubleStream.empty() : new ArrayDoubleStream(elements, fromIndex, middleIndex, null, sorted);
a[1] = middleIndex == toIndex ? DoubleStream.empty() : new ArrayDoubleStream(elements, middleIndex, toIndex, null, sorted);
return new ArrayStream<>(a, closeHandlers);
}
@Override
public Stream splitBy(DoublePredicate where) {
N.requireNonNull(where);
int n = 0;
for (int i = fromIndex; i < toIndex; i++) {
if (where.test(elements[i])) {
n++;
} else {
break;
}
}
return splitAt(n);
}
@Override
public Stream sliding(final int windowSize, final int increment) {
N.checkArgument(windowSize > 0 && increment > 0, "'windowSize'=%s and 'increment'=%s must not be less than 1", windowSize, increment);
return new IteratorStream(new ExIterator() {
private int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public DoubleStream next() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
final ArrayDoubleStream result = new ArrayDoubleStream(elements, cursor, windowSize < toIndex - cursor ? cursor + windowSize : toIndex, null,
sorted);
cursor = increment < toIndex - cursor && windowSize < toIndex - cursor ? cursor + increment : toIndex;
return result;
}
}, closeHandlers);
}
@Override
public Stream slidingToList(final int windowSize, final int increment) {
N.checkArgument(windowSize > 0 && increment > 0, "'windowSize'=%s and 'increment'=%s must not be less than 1", windowSize, increment);
return new IteratorStream(new ExIterator() {
private int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public DoubleList next() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
final DoubleList result = DoubleList.of(N.copyOfRange(elements, cursor, windowSize < toIndex - cursor ? cursor + windowSize : toIndex));
cursor = increment < toIndex - cursor && windowSize < toIndex - cursor ? cursor + increment : toIndex;
return result;
}
}, closeHandlers);
}
@Override
public DoubleStream top(int n) {
return top(n, DOUBLE_COMPARATOR);
}
@Override
public DoubleStream top(int n, Comparator comparator) {
if (n < 1) {
throw new IllegalArgumentException("'n' can not be less than 1");
}
if (n >= toIndex - fromIndex) {
return this;
} else if (sorted && isSameComparator(comparator, DOUBLE_COMPARATOR)) {
return new ArrayDoubleStream(elements, toIndex - n, toIndex, closeHandlers, sorted);
} else {
return new ArrayDoubleStream(N.top(elements, fromIndex, toIndex, n, comparator), closeHandlers, sorted);
}
}
@Override
public DoubleStream sorted() {
if (sorted) {
return this;
}
final double[] a = N.copyOfRange(elements, fromIndex, toIndex);
N.sort(a);
return new ArrayDoubleStream(a, closeHandlers, true);
}
@Override
public DoubleStream peek(final DoubleConsumer action) {
return new IteratorDoubleStream(new ExDoubleIterator() {
int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public double nextDouble() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
action.accept(elements[cursor]);
return elements[cursor++];
}
@Override
public double[] toArray() {
final double[] a = new double[toIndex - cursor];
for (int i = 0, len = toIndex - cursor; i < len; i++) {
action.accept(elements[cursor]);
a[i] = elements[cursor++];
}
return a;
}
}, closeHandlers, sorted);
}
@Override
public DoubleStream limit(long maxSize) {
if (maxSize < 0) {
throw new IllegalArgumentException("'maxSize' can't be negative: " + maxSize);
} else if (maxSize >= toIndex - fromIndex) {
return this;
}
return new ArrayDoubleStream(elements, fromIndex, (int) (fromIndex + maxSize), closeHandlers, sorted);
}
@Override
public DoubleStream skip(long n) {
if (n < 0) {
throw new IllegalArgumentException("The skipped number can't be negative: " + n);
} else if (n == 0) {
return this;
}
if (n >= toIndex - fromIndex) {
return new ArrayDoubleStream(elements, toIndex, toIndex, closeHandlers, sorted);
} else {
return new ArrayDoubleStream(elements, (int) (fromIndex + n), toIndex, closeHandlers, sorted);
}
}
@Override
public void forEach(DoubleConsumer action) {
for (int i = fromIndex; i < toIndex; i++) {
action.accept(elements[i]);
}
}
@Override
public double[] toArray() {
return N.copyOfRange(elements, fromIndex, toIndex);
}
@Override
public DoubleList toDoubleList() {
return DoubleList.of(N.copyOfRange(elements, fromIndex, toIndex));
}
@Override
public List toList() {
final List result = new ArrayList<>(toIndex - fromIndex);
for (int i = fromIndex; i < toIndex; i++) {
result.add(elements[i]);
}
return result;
}
@Override
public > R toList(Supplier supplier) {
final R result = supplier.get();
for (int i = fromIndex; i < toIndex; i++) {
result.add(elements[i]);
}
return result;
}
@Override
public Set toSet() {
final Set result = new HashSet<>(N.min(9, N.initHashCapacity(toIndex - fromIndex)));
for (int i = fromIndex; i < toIndex; i++) {
result.add(elements[i]);
}
return result;
}
@Override
public > R toSet(Supplier supplier) {
final R result = supplier.get();
for (int i = fromIndex; i < toIndex; i++) {
result.add(elements[i]);
}
return result;
}
@Override
public Multiset toMultiset() {
final Multiset result = new Multiset<>(N.min(9, N.initHashCapacity(toIndex - fromIndex)));
for (int i = fromIndex; i < toIndex; i++) {
result.add(elements[i]);
}
return result;
}
@Override
public Multiset toMultiset(Supplier> supplier) {
final Multiset result = supplier.get();
for (int i = fromIndex; i < toIndex; i++) {
result.add(elements[i]);
}
return result;
}
@Override
public LongMultiset toLongMultiset() {
final LongMultiset result = new LongMultiset<>(N.min(9, N.initHashCapacity(toIndex - fromIndex)));
for (int i = fromIndex; i < toIndex; i++) {
result.add(elements[i]);
}
return result;
}
@Override
public LongMultiset toLongMultiset(Supplier> supplier) {
final LongMultiset result = supplier.get();
for (int i = fromIndex; i < toIndex; i++) {
result.add(elements[i]);
}
return result;
}
@Override
public > M toMap(DoubleFunction keyExtractor, DoubleFunction valueMapper,
BinaryOperator mergeFunction, Supplier mapFactory) {
final M result = mapFactory.get();
for (int i = fromIndex; i < toIndex; i++) {
Collectors.merge(result, keyExtractor.apply(elements[i]), valueMapper.apply(elements[i]), mergeFunction);
}
return result;
}
@Override
public > M toMap(final DoubleFunction classifier, final Collector downstream,
final Supplier mapFactory) {
final M result = mapFactory.get();
final Supplier downstreamSupplier = downstream.supplier();
final BiConsumer downstreamAccumulator = downstream.accumulator();
final Map intermediate = (Map) result;
K key = null;
A v = null;
for (int i = fromIndex; i < toIndex; i++) {
key = N.requireNonNull(classifier.apply(elements[i]), "element cannot be mapped to a null key");
if ((v = intermediate.get(key)) == null) {
if ((v = downstreamSupplier.get()) != null) {
intermediate.put(key, v);
}
}
downstreamAccumulator.accept(v, elements[i]);
}
final BiFunction function = new BiFunction() {
@Override
public A apply(K k, A v) {
return (A) downstream.finisher().apply(v);
}
};
Collectors.replaceAll(intermediate, function);
return result;
}
@Override
public > Multimap toMultimap(DoubleFunction keyExtractor, DoubleFunction valueMapper,
Supplier> mapFactory) {
final Multimap result = mapFactory.get();
for (int i = fromIndex; i < toIndex; i++) {
result.put(keyExtractor.apply(elements[i]), valueMapper.apply(elements[i]));
}
return result;
}
@Override
public OptionalDouble first() {
return fromIndex < toIndex ? OptionalDouble.of(elements[fromIndex]) : OptionalDouble.empty();
}
@Override
public OptionalDouble last() {
return fromIndex < toIndex ? OptionalDouble.of(elements[toIndex - 1]) : OptionalDouble.empty();
}
@Override
public double reduce(double identity, DoubleBinaryOperator op) {
double result = identity;
for (int i = fromIndex; i < toIndex; i++) {
result = op.applyAsDouble(result, elements[i]);
}
return result;
}
@Override
public OptionalDouble reduce(DoubleBinaryOperator op) {
if (fromIndex == toIndex) {
return OptionalDouble.empty();
}
double result = elements[fromIndex];
for (int i = fromIndex + 1; i < toIndex; i++) {
result = op.applyAsDouble(result, elements[i]);
}
return OptionalDouble.of(result);
}
@Override
public R collect(Supplier supplier, ObjDoubleConsumer accumulator, BiConsumer combiner) {
final R result = supplier.get();
for (int i = fromIndex; i < toIndex; i++) {
accumulator.accept(result, elements[i]);
}
return result;
}
@Override
public OptionalDouble head() {
return fromIndex == toIndex ? OptionalDouble.empty() : OptionalDouble.of(elements[fromIndex]);
}
@Override
public DoubleStream tail() {
if (fromIndex == toIndex) {
return this;
}
return new ArrayDoubleStream(elements, fromIndex + 1, toIndex, closeHandlers, sorted);
}
@Override
public DoubleStream head2() {
if (fromIndex == toIndex) {
return this;
}
return new ArrayDoubleStream(elements, fromIndex, toIndex - 1, closeHandlers, sorted);
}
@Override
public OptionalDouble tail2() {
return fromIndex == toIndex ? OptionalDouble.empty() : OptionalDouble.of(elements[toIndex - 1]);
}
@Override
public OptionalDouble min() {
if (fromIndex == toIndex) {
return OptionalDouble.empty();
} else if (sorted) {
return OptionalDouble.of(elements[fromIndex]);
}
return OptionalDouble.of(N.min(elements, fromIndex, toIndex));
}
@Override
public OptionalDouble max() {
if (fromIndex == toIndex) {
return OptionalDouble.empty();
} else if (sorted) {
return OptionalDouble.of(elements[toIndex - 1]);
}
return OptionalDouble.of(N.max(elements, fromIndex, toIndex));
}
@Override
public OptionalDouble kthLargest(int k) {
N.checkArgument(k > 0, "'k' must be bigger than 0");
if (k > toIndex - fromIndex) {
return OptionalDouble.empty();
} else if (sorted) {
return OptionalDouble.of(elements[toIndex - k]);
}
return OptionalDouble.of(N.kthLargest(elements, fromIndex, toIndex, k));
}
@Override
public long count() {
return toIndex - fromIndex;
}
@Override
public DoubleStream reversed() {
return new IteratorDoubleStream(new ExDoubleIterator() {
private int cursor = toIndex;
@Override
public boolean hasNext() {
return cursor > fromIndex;
}
@Override
public double nextDouble() {
if (cursor <= fromIndex) {
throw new NoSuchElementException();
}
return elements[--cursor];
}
@Override
public long count() {
return cursor - fromIndex;
}
@Override
public void skip(long n) {
cursor = n < cursor - fromIndex ? cursor - (int) n : fromIndex;
}
@Override
public double[] toArray() {
final double[] a = new double[cursor - fromIndex];
for (int i = 0, len = a.length; i < len; i++) {
a[i] = elements[cursor - i - 1];
}
return a;
}
}, closeHandlers);
}
@Override
public DoubleSummaryStatistics summarize() {
final DoubleSummaryStatistics result = new DoubleSummaryStatistics();
for (int i = fromIndex; i < toIndex; i++) {
result.accept(elements[i]);
}
return result;
}
@Override
public boolean anyMatch(final DoublePredicate predicate) {
for (int i = fromIndex; i < toIndex; i++) {
if (predicate.test(elements[i])) {
return true;
}
}
return false;
}
@Override
public boolean allMatch(final DoublePredicate predicate) {
for (int i = fromIndex; i < toIndex; i++) {
if (predicate.test(elements[i]) == false) {
return false;
}
}
return true;
}
@Override
public boolean noneMatch(final DoublePredicate predicate) {
for (int i = fromIndex; i < toIndex; i++) {
if (predicate.test(elements[i])) {
return false;
}
}
return true;
}
@Override
public OptionalDouble findFirst(final DoublePredicate predicate) {
for (int i = fromIndex; i < toIndex; i++) {
if (predicate.test(elements[i])) {
return OptionalDouble.of(elements[i]);
}
}
return OptionalDouble.empty();
}
@Override
public OptionalDouble findLast(final DoublePredicate predicate) {
for (int i = toIndex - 1; i >= fromIndex; i--) {
if (predicate.test(elements[i])) {
return OptionalDouble.of(elements[i]);
}
}
return OptionalDouble.empty();
}
@Override
public Stream boxed() {
return new IteratorStream(iterator(), closeHandlers, sorted, sorted ? DOUBLE_COMPARATOR : null);
}
@Override
public DoubleStream cached() {
return this;
}
@Override
ExDoubleIterator exIterator() {
return ExDoubleIterator.of(elements, fromIndex, toIndex);
}
@Override
public DoubleStream parallel(int maxThreadNum, Splitor splitor) {
if (maxThreadNum < 1 || maxThreadNum > MAX_THREAD_NUM_PER_OPERATION) {
throw new IllegalArgumentException("'maxThreadNum' must not less than 1 or exceeded: " + MAX_THREAD_NUM_PER_OPERATION);
}
return new ParallelArrayDoubleStream(elements, fromIndex, toIndex, closeHandlers, sorted, maxThreadNum, splitor);
}
@Override
public DoubleStream onClose(Runnable closeHandler) {
final Set newCloseHandlers = new AbstractStream.LocalLinkedHashSet<>(N.isNullOrEmpty(this.closeHandlers) ? 1 : this.closeHandlers.size() + 1);
if (N.notNullOrEmpty(this.closeHandlers)) {
newCloseHandlers.addAll(this.closeHandlers);
}
newCloseHandlers.add(closeHandler);
return new ArrayDoubleStream(elements, fromIndex, toIndex, newCloseHandlers, sorted);
}
}
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