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fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists and priority queues with a small memory footprint and fast access and insertion; provides also big (64-bit) arrays, sets and lists, and fast, practical I/O classes for binary and text files.
/*
* Copyright (C) 2002-2020 Sebastiano Vigna
*
* 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 PACKAGE;
import java.util.Iterator;
#if defined JDK_PRIMITIVE_ITERATOR && !KEY_WIDENED
import java.util.PrimitiveIterator;
#endif
#if (!defined JDK_PRIMITIVE_ITERATOR || KEY_WIDENED) && KEYS_PRIMITIVE
import java.util.Objects;
#endif
#ifdef KEYS_PRIMITIVE
import java.util.function.Consumer;
#endif
/** A type-specific {@link Iterator}; provides an additional method to avoid (un)boxing, and
* the possibility to skip elements.
*
* @see Iterator
*/
#if defined JDK_PRIMITIVE_ITERATOR && !KEY_WIDENED
public interface KEY_ITERATOR KEY_GENERIC extends JDK_PRIMITIVE_ITERATOR {
#else
public interface KEY_ITERATOR KEY_GENERIC extends Iterator {
#endif
#if KEYS_PRIMITIVE
/**
* Returns the next element as a primitive type.
*
* @return the next element in the iteration.
* @see Iterator#next()
*/
#if defined JDK_PRIMITIVE_ITERATOR && !KEY_WIDENED
@Override
#endif
KEY_TYPE NEXT_KEY();
/** {@inheritDoc}
* @deprecated Please use the corresponding type-specific method instead. */
@Deprecated
@Override
default KEY_CLASS next() {
return KEY_CLASS.valueOf(NEXT_KEY());
}
#if !defined JDK_PRIMITIVE_ITERATOR || KEY_WIDENED
/**
* Performs the given action for each remaining element until all elements
* have been processed or the action throws an exception.
* @param action the action to be performed for each element.
* @see java.util.Iterator#forEachRemaining(java.util.function.Consumer)
* @since 8.0.0
*/
default void forEachRemaining(final KEY_CONSUMER action) {
Objects.requireNonNull(action);
while (hasNext()) {
action.accept(NEXT_KEY());
}
}
#endif
/** {@inheritDoc}
* @deprecated Please use the corresponding type-specific method instead. */
@Deprecated
@Override
default void forEachRemaining(final Consumer action) {
#if defined JDK_PRIMITIVE_ITERATOR && !KEY_WIDENED
forEachRemaining((JDK_PRIMITIVE_KEY_CONSUMER) action::accept);
#else
forEachRemaining((KEY_CONSUMER) action::accept);
#endif
}
#endif
/** Skips the given number of elements.
*
* The effect of this call is exactly the same as that of calling {@link #next()} for {@code n} times (possibly stopping if {@link #hasNext()} becomes false).
*
* @param n the number of elements to skip.
* @return the number of elements actually skipped.
* @see Iterator#next()
*/
default int skip(final int n) {
if (n < 0) throw new IllegalArgumentException("Argument must be nonnegative: " + n);
int i = n;
while(i-- != 0 && hasNext()) NEXT_KEY();
return n - i - 1;
}
}