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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.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.ByteIterator;
import com.landawn.abacus.util.ByteList;
import com.landawn.abacus.util.ByteSummaryStatistics;
import com.landawn.abacus.util.IntIterator;
import com.landawn.abacus.util.LongMultiset;
import com.landawn.abacus.util.Multiset;
import com.landawn.abacus.util.N;
import com.landawn.abacus.util.OptionalByte;
import com.landawn.abacus.util.OptionalDouble;
import com.landawn.abacus.util.Try;
import com.landawn.abacus.util.function.BiConsumer;
import com.landawn.abacus.util.function.BiFunction;
import com.landawn.abacus.util.function.BiPredicate;
import com.landawn.abacus.util.function.BinaryOperator;
import com.landawn.abacus.util.function.ByteBinaryOperator;
import com.landawn.abacus.util.function.ByteConsumer;
import com.landawn.abacus.util.function.ByteFunction;
import com.landawn.abacus.util.function.BytePredicate;
import com.landawn.abacus.util.function.ByteToIntFunction;
import com.landawn.abacus.util.function.ByteUnaryOperator;
import com.landawn.abacus.util.function.Consumer;
import com.landawn.abacus.util.function.ObjByteConsumer;
import com.landawn.abacus.util.function.Supplier;
/**
* This class is a sequential, stateful and immutable stream implementation.
*
* @since 0.8
*
* @author Haiyang Li
*/
class ArrayByteStream extends AbstractByteStream {
final byte[] elements;
final int fromIndex;
final int toIndex;
ArrayByteStream(final byte[] values) {
this(values, 0, values.length);
}
ArrayByteStream(final byte[] values, final Collection closeHandlers) {
this(values, 0, values.length, closeHandlers);
}
ArrayByteStream(final byte[] values, final boolean sorted, final Collection closeHandlers) {
this(values, 0, values.length, sorted, closeHandlers);
}
ArrayByteStream(final byte[] values, final int fromIndex, final int toIndex) {
this(values, fromIndex, toIndex, null);
}
ArrayByteStream(final byte[] values, final int fromIndex, final int toIndex, final Collection closeHandlers) {
this(values, fromIndex, toIndex, false, closeHandlers);
}
ArrayByteStream(final byte[] values, final int fromIndex, final int toIndex, final boolean sorted, final Collection closeHandlers) {
super(sorted, closeHandlers);
N.checkFromToIndex(fromIndex, toIndex, N.len(values));
this.elements = values;
this.fromIndex = fromIndex;
this.toIndex = toIndex;
}
@Override
public ByteStream filter(final BytePredicate predicate) {
return newStream(new ByteIteratorEx() {
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 byte nextByte() {
if (hasNext == false && hasNext() == false) {
throw new NoSuchElementException();
}
hasNext = false;
return elements[cursor++];
}
}, sorted);
}
@Override
public ByteStream takeWhile(final BytePredicate predicate) {
return newStream(new ByteIteratorEx() {
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 byte nextByte() {
if (hasNext == false && hasNext() == false) {
throw new NoSuchElementException();
}
hasNext = false;
return elements[cursor++];
}
}, sorted);
}
@Override
public ByteStream dropWhile(final BytePredicate predicate) {
return newStream(new ByteIteratorEx() {
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 byte nextByte() {
if (hasNext == false && hasNext() == false) {
throw new NoSuchElementException();
}
hasNext = false;
return elements[cursor++];
}
}, sorted);
}
@Override
public ByteStream step(final long step) {
N.checkArgPositive(step, "step");
if (step == 1 || fromIndex == toIndex) {
return this;
}
return newStream(new ByteIteratorEx() {
private final int stepp = (int) N.min(step, Integer.MAX_VALUE);
private int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public byte nextByte() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
final byte res = elements[cursor];
cursor = cursor > toIndex - stepp ? toIndex : cursor + stepp;
return res;
}
@Override
public long count() {
return (toIndex - cursor) % stepp == 0 ? (toIndex - cursor) / stepp : ((toIndex - cursor) / stepp) + 1;
}
@Override
public void skip(long n) {
if (n > 0) {
cursor = n <= (toIndex - cursor) / stepp ? cursor + (int) (n * stepp) : toIndex;
}
}
@Override
public byte[] toArray() {
final byte[] a = new byte[(int) count()];
for (int i = 0, len = a.length; i < len; i++, cursor += stepp) {
a[i] = elements[cursor];
}
return a;
}
}, sorted);
}
@Override
public ByteStream map(final ByteUnaryOperator mapper) {
return newStream(new ByteIteratorEx() {
private int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public byte nextByte() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
return mapper.applyAsByte(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 byte[] toArray() {
final byte[] a = new byte[toIndex - cursor];
for (int i = 0, len = toIndex - cursor; i < len; i++) {
a[i] = mapper.applyAsByte(elements[cursor++]);
}
return a;
}
}, false);
}
@Override
public IntStream mapToInt(final ByteToIntFunction mapper) {
return newStream(new IntIteratorEx() {
private 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;
}
}, false);
}
@Override
public Stream mapToObj(final ByteFunction mapper) {
return newStream(new ObjIteratorEx() {
private 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;
}
}, false, null);
}
@Override
public ByteStream flatMap(final ByteFunction mapper) {
final ByteIteratorEx iter = new ByteIteratorEx() {
private int cursor = fromIndex;
private ByteIterator cur = null;
private ByteStream s = null;
private Runnable closeHandle = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && cursor < toIndex) {
if (closeHandle != null) {
final Runnable tmp = closeHandle;
closeHandle = null;
tmp.run();
}
s = mapper.apply(elements[cursor++]);
if (N.notNullOrEmpty(s.closeHandlers)) {
final Set tmp = s.closeHandlers;
closeHandle = new Runnable() {
@Override
public void run() {
Stream.close(tmp);
}
};
}
cur = s.iterator();
}
return cur != null && cur.hasNext();
}
@Override
public byte nextByte() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextByte();
}
@Override
public void close() {
if (closeHandle != null) {
final Runnable tmp = closeHandle;
closeHandle = null;
tmp.run();
}
}
};
final Set newCloseHandlers = N.isNullOrEmpty(closeHandlers) ? new LocalLinkedHashSet(1)
: new LocalLinkedHashSet(closeHandlers);
newCloseHandlers.add(new Runnable() {
@Override
public void run() {
iter.close();
}
});
return new IteratorByteStream(iter, newCloseHandlers);
}
@Override
public IntStream flatMapToInt(final ByteFunction mapper) {
final IntIteratorEx iter = new IntIteratorEx() {
private int cursor = fromIndex;
private IntIterator cur = null;
private IntStream s = null;
private Runnable closeHandle = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && cursor < toIndex) {
if (closeHandle != null) {
final Runnable tmp = closeHandle;
closeHandle = null;
tmp.run();
}
s = mapper.apply(elements[cursor++]);
if (N.notNullOrEmpty(s.closeHandlers)) {
final Set tmp = s.closeHandlers;
closeHandle = new Runnable() {
@Override
public void run() {
Stream.close(tmp);
}
};
}
cur = s.iterator();
}
return cur != null && cur.hasNext();
}
@Override
public int nextInt() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.nextInt();
}
@Override
public void close() {
if (closeHandle != null) {
final Runnable tmp = closeHandle;
closeHandle = null;
tmp.run();
}
}
};
final Set newCloseHandlers = N.isNullOrEmpty(closeHandlers) ? new LocalLinkedHashSet(1)
: new LocalLinkedHashSet(closeHandlers);
newCloseHandlers.add(new Runnable() {
@Override
public void run() {
iter.close();
}
});
return new IteratorIntStream(iter, newCloseHandlers);
}
@Override
public Stream flatMapToObj(final ByteFunction> mapper) {
final ObjIteratorEx iter = new ObjIteratorEx() {
private int cursor = fromIndex;
private Iterator cur = null;
private Stream s = null;
private Runnable closeHandle = null;
@Override
public boolean hasNext() {
while ((cur == null || cur.hasNext() == false) && cursor < toIndex) {
if (closeHandle != null) {
final Runnable tmp = closeHandle;
closeHandle = null;
tmp.run();
}
s = mapper.apply(elements[cursor++]);
if (N.notNullOrEmpty(s.closeHandlers)) {
final Set tmp = s.closeHandlers;
closeHandle = new Runnable() {
@Override
public void run() {
Stream.close(tmp);
}
};
}
cur = s.iterator();
}
return cur != null && cur.hasNext();
}
@Override
public T next() {
if ((cur == null || cur.hasNext() == false) && hasNext() == false) {
throw new NoSuchElementException();
}
return cur.next();
}
@Override
public void close() {
if (closeHandle != null) {
final Runnable tmp = closeHandle;
closeHandle = null;
tmp.run();
}
}
};
final Set newCloseHandlers = N.isNullOrEmpty(closeHandlers) ? new LocalLinkedHashSet(1)
: new LocalLinkedHashSet(closeHandlers);
newCloseHandlers.add(new Runnable() {
@Override
public void run() {
iter.close();
}
});
return new IteratorStream<>(iter, newCloseHandlers);
}
@Override
public Stream split(final int size) {
N.checkArgPositive(size, "size");
return newStream(new ObjIteratorEx() {
private int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public ByteStream next() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
return new ArrayByteStream(elements, cursor, (cursor = size < toIndex - cursor ? cursor + size : toIndex), sorted, null);
}
@Override
public long count() {
final long len = toIndex - cursor;
return len % size == 0 ? len / size : len / size + 1;
}
@Override
public void skip(long n) {
final long len = toIndex - cursor;
cursor = n <= len / size ? cursor + (int) n * size : toIndex;
}
}, false, null);
}
@Override
public Stream splitToList(final int size) {
N.checkArgPositive(size, "size");
return newStream(new ObjIteratorEx() {
private int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public ByteList next() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
return new ByteList(N.copyOfRange(elements, cursor, (cursor = size < toIndex - cursor ? cursor + size : toIndex)));
}
@Override
public long count() {
final long len = toIndex - cursor;
return len % size == 0 ? len / size : len / size + 1;
}
@Override
public void skip(long n) {
final long len = toIndex - cursor;
cursor = n <= len / size ? cursor + (int) n * size : toIndex;
}
}, false, null);
}
@Override
public Stream split(final U seed, final BiPredicate predicate, final Consumer seedUpdate) {
return newStream(new ObjIteratorEx() {
private int cursor = fromIndex;
private boolean preCondition = false;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public ByteStream next() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
final int from = cursor;
while (cursor < toIndex) {
if (from == cursor) {
preCondition = predicate.test(elements[from], seed);
cursor++;
} else if (predicate.test(elements[cursor], seed) == preCondition) {
cursor++;
} else {
if (seedUpdate != null) {
seedUpdate.accept(seed);
}
break;
}
}
return new ArrayByteStream(elements, from, cursor, sorted, null);
}
}, false, null);
}
@Override
public Stream splitToList(final U seed, final BiPredicate predicate, final Consumer seedUpdate) {
return newStream(new ObjIteratorEx() {
private int cursor = fromIndex;
private boolean preCondition = false;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public ByteList next() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
final int from = cursor;
while (cursor < toIndex) {
if (from == cursor) {
preCondition = predicate.test(elements[from], seed);
cursor++;
} else if (predicate.test(elements[cursor], seed) == preCondition) {
cursor++;
} else {
if (seedUpdate != null) {
seedUpdate.accept(seed);
}
break;
}
}
return new ByteList(N.copyOfRange(elements, from, cursor));
}
}, false, null);
}
@Override
public Stream split(final BytePredicate predicate) {
return newStream(new ObjIteratorEx() {
private int cursor = fromIndex;
private boolean preCondition = false;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public ByteStream 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 ArrayByteStream(elements, from, cursor, sorted, null);
}
}, false, null);
}
@Override
public Stream splitToList(final BytePredicate predicate) {
return newStream(new ObjIteratorEx() {
private int cursor = fromIndex;
private boolean preCondition = false;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public ByteList 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 ByteList(N.copyOfRange(elements, from, cursor));
}
}, false, null);
}
@Override
public Stream splitAt(final int n) {
N.checkArgNotNegative(n, "n");
final ByteStream[] a = new ByteStream[2];
final int middleIndex = n < toIndex - fromIndex ? fromIndex + n : toIndex;
a[0] = middleIndex == fromIndex ? ByteStream.empty() : new ArrayByteStream(elements, fromIndex, middleIndex, sorted, null);
a[1] = middleIndex == toIndex ? ByteStream.empty() : new ArrayByteStream(elements, middleIndex, toIndex, sorted, null);
return newStream(a, false, null);
}
@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 newStream(new ObjIteratorEx() {
private int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public ByteStream next() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
final ArrayByteStream result = new ArrayByteStream(elements, cursor, windowSize < toIndex - cursor ? cursor + windowSize : toIndex, sorted,
null);
cursor = increment < toIndex - cursor && windowSize < toIndex - cursor ? cursor + increment : toIndex;
return result;
}
@Override
public long count() {
if (toIndex - cursor == 0) {
return 0;
} else if (toIndex - cursor <= windowSize) {
return 1;
} else {
final long len = (toIndex - cursor) - windowSize;
return 1 + (len % increment == 0 ? len / increment : len / increment + 1);
}
}
@Override
public void skip(long n) {
if (n > 0) {
if (n >= count()) {
cursor = toIndex;
} else {
cursor += n * increment;
}
}
}
}, false, null);
}
@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 newStream(new ObjIteratorEx() {
private int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public ByteList next() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
final ByteList result = ByteList.of(N.copyOfRange(elements, cursor, windowSize < toIndex - cursor ? cursor + windowSize : toIndex));
cursor = increment < toIndex - cursor && windowSize < toIndex - cursor ? cursor + increment : toIndex;
return result;
}
@Override
public long count() {
if (toIndex - cursor == 0) {
return 0;
} else if (toIndex - cursor <= windowSize) {
return 1;
} else {
final long len = (toIndex - cursor) - windowSize;
return 1 + (len % increment == 0 ? len / increment : len / increment + 1);
}
}
@Override
public void skip(long n) {
if (n > 0) {
if (n >= count()) {
cursor = toIndex;
} else {
cursor += n * increment;
}
}
}
}, false, null);
}
@Override
public ByteStream peek(final ByteConsumer action) {
return newStream(new ByteIteratorEx() {
private int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public byte nextByte() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
action.accept(elements[cursor]);
return elements[cursor++];
}
@Override
public byte[] toArray() {
final byte[] a = new byte[toIndex - cursor];
for (int i = 0, len = toIndex - cursor; i < len; i++) {
action.accept(elements[cursor]);
a[i] = elements[cursor++];
}
return a;
}
}, sorted);
}
@Override
public ByteStream limit(long maxSize) {
N.checkArgNotNegative(maxSize, "maxSize");
if (maxSize >= toIndex - fromIndex) {
return this;
}
return newStream(elements, fromIndex, (int) (fromIndex + maxSize), sorted);
}
@Override
public ByteStream skip(long n) {
N.checkArgNotNegative(n, "n");
if (n == 0) {
return this;
}
if (n >= toIndex - fromIndex) {
return newStream(elements, toIndex, toIndex, sorted);
} else {
return newStream(elements, (int) (fromIndex + n), toIndex, sorted);
}
}
@Override
public void forEach(final Try.ByteConsumer action) throws E {
for (int i = fromIndex; i < toIndex; i++) {
action.accept(elements[i]);
}
}
@Override
public byte[] toArray() {
return N.copyOfRange(elements, fromIndex, toIndex);
}
@Override
public ByteList toByteList() {
return ByteList.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 Set toSet() {
final Set result = new HashSet<>(N.initHashCapacity(toIndex - fromIndex));
for (int i = fromIndex; i < toIndex; i++) {
result.add(elements[i]);
}
return result;
}
@Override
public > C toCollection(Supplier supplier) {
final C 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.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.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(ByteFunction keyExtractor, ByteFunction 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 ByteFunction 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.checkArgNotNull(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 OptionalByte first() {
return fromIndex < toIndex ? OptionalByte.of(elements[fromIndex]) : OptionalByte.empty();
}
@Override
public OptionalByte last() {
return fromIndex < toIndex ? OptionalByte.of(elements[toIndex - 1]) : OptionalByte.empty();
}
@Override
public byte reduce(byte identity, ByteBinaryOperator op) {
byte result = identity;
for (int i = fromIndex; i < toIndex; i++) {
result = op.applyAsByte(result, elements[i]);
}
return result;
}
@Override
public OptionalByte reduce(ByteBinaryOperator op) {
if (fromIndex == toIndex) {
return OptionalByte.empty();
}
byte result = elements[fromIndex];
for (int i = fromIndex + 1; i < toIndex; i++) {
result = op.applyAsByte(result, elements[i]);
}
return OptionalByte.of(result);
}
@Override
public R collect(Supplier supplier, ObjByteConsumer accumulator, BiConsumer combiner) {
final R result = supplier.get();
for (int i = fromIndex; i < toIndex; i++) {
accumulator.accept(result, elements[i]);
}
return result;
}
@Override
public OptionalByte head() {
return fromIndex == toIndex ? OptionalByte.empty() : OptionalByte.of(elements[fromIndex]);
}
@Override
public ByteStream tail() {
if (fromIndex == toIndex) {
return this;
}
return newStream(elements, fromIndex + 1, toIndex, sorted);
}
// @Override
// public ByteStream headd() {
// if (fromIndex == toIndex) {
// return this;
// }
//
// return newStream(elements, fromIndex, toIndex - 1, sorted);
// }
//
// @Override
// public OptionalByte taill() {
// return fromIndex == toIndex ? OptionalByte.empty() : OptionalByte.of(elements[toIndex - 1]);
// }
@Override
public OptionalByte min() {
if (fromIndex == toIndex) {
return OptionalByte.empty();
} else if (sorted) {
return OptionalByte.of(elements[fromIndex]);
}
return OptionalByte.of(N.min(elements, fromIndex, toIndex));
}
@Override
public OptionalByte max() {
if (fromIndex == toIndex) {
return OptionalByte.empty();
} else if (sorted) {
return OptionalByte.of(elements[toIndex - 1]);
}
return OptionalByte.of(N.max(elements, fromIndex, toIndex));
}
@Override
public OptionalByte kthLargest(int k) {
N.checkArgPositive(k, "k");
if (k > toIndex - fromIndex) {
return OptionalByte.empty();
} else if (sorted) {
return OptionalByte.of(elements[toIndex - k]);
}
return OptionalByte.of(N.kthLargest(elements, fromIndex, toIndex, k));
}
@Override
public long sum() {
return sum(elements, fromIndex, toIndex);
}
@Override
public OptionalDouble average() {
if (fromIndex == toIndex) {
return OptionalDouble.empty();
}
return OptionalDouble.of(sum() / toIndex - fromIndex);
}
@Override
public long count() {
return toIndex - fromIndex;
}
@Override
public ByteStream reversed() {
return newStream(new ByteIteratorEx() {
private int cursor = toIndex;
@Override
public boolean hasNext() {
return cursor > fromIndex;
}
@Override
public byte nextByte() {
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 byte[] toArray() {
final byte[] a = new byte[cursor - fromIndex];
for (int i = 0, len = cursor - fromIndex; i < len; i++) {
a[i] = elements[cursor - i - 1];
}
return a;
}
}, false);
}
@Override
public ByteStream rotated(final int distance) {
if (distance == 0 || toIndex - fromIndex <= 1 || distance % (toIndex - fromIndex) == 0) {
return this;
}
return newStream(new ByteIteratorEx() {
private final int len = toIndex - fromIndex;
private int start;
private int cnt = 0;
{
start = distance % len;
if (start < 0) {
start += len;
}
start = len - start;
}
@Override
public boolean hasNext() {
return cnt < len;
}
@Override
public byte nextByte() {
if (hasNext() == false) {
throw new NoSuchElementException();
}
return elements[((start + cnt++) % len) + fromIndex];
}
@Override
public long count() {
return len - cnt;
}
@Override
public void skip(long n) {
cnt = n < len - cnt ? cnt + (int) n : len;
}
@Override
public byte[] toArray() {
final byte[] a = new byte[len - cnt];
for (int i = cnt; i < len; i++) {
a[i - cnt] = elements[((start + i) % len) + fromIndex];
}
return a;
}
}, false);
}
@Override
public ByteSummaryStatistics summarize() {
final ByteSummaryStatistics result = new ByteSummaryStatistics();
for (int i = fromIndex; i < toIndex; i++) {
result.accept(elements[i]);
}
return result;
}
@Override
public boolean anyMatch(final Try.BytePredicate predicate) throws E {
for (int i = fromIndex; i < toIndex; i++) {
if (predicate.test(elements[i])) {
return true;
}
}
return false;
}
@Override
public boolean allMatch(final Try.BytePredicate predicate) throws E {
for (int i = fromIndex; i < toIndex; i++) {
if (predicate.test(elements[i]) == false) {
return false;
}
}
return true;
}
@Override
public boolean noneMatch(final Try.BytePredicate predicate) throws E {
for (int i = fromIndex; i < toIndex; i++) {
if (predicate.test(elements[i])) {
return false;
}
}
return true;
}
@Override
public OptionalByte findFirst(final Try.BytePredicate predicate) throws E {
for (int i = fromIndex; i < toIndex; i++) {
if (predicate.test(elements[i])) {
return OptionalByte.of(elements[i]);
}
}
return OptionalByte.empty();
}
@Override
public OptionalByte findLast(final Try.BytePredicate predicate) throws E {
for (int i = toIndex - 1; i >= fromIndex; i--) {
if (predicate.test(elements[i])) {
return OptionalByte.of(elements[i]);
}
}
return OptionalByte.empty();
}
@Override
public IntStream asIntStream() {
return newStream(new IntIteratorEx() {
private int cursor = fromIndex;
@Override
public boolean hasNext() {
return cursor < toIndex;
}
@Override
public int nextInt() {
if (cursor >= toIndex) {
throw new NoSuchElementException();
}
return 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] = elements[cursor++];
}
return a;
}
}, sorted);
}
@Override
public Stream boxed() {
return new IteratorStream<>(iterator(), sorted, sorted ? BYTE_COMPARATOR : null, closeHandlers);
}
@Override
public ByteStream cached() {
return this;
}
@Override
ByteIteratorEx iteratorEx() {
return ByteIteratorEx.of(elements, fromIndex, toIndex);
}
@Override
public ByteStream parallel(int maxThreadNum, Splitor splitor) {
return new ParallelArrayByteStream(elements, fromIndex, toIndex, sorted, maxThreadNum, splitor, closeHandlers);
}
@Override
public ByteStream 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 ArrayByteStream(elements, fromIndex, toIndex, sorted, newCloseHandlers);
}
}
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