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/*
* Copyright (C) 2002-2017 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 it.unimi.dsi.fastutil.ints;
import java.util.Collection;
/**
* A type-specific {@link Collection}; provides some additional methods that use
* polymorphism to avoid (un)boxing.
*
*
* Additionally, this class defines strengthens (again) {@link #iterator()}.
*
* @see Collection
*/
public interface IntCollection extends Collection, IntIterable {
/**
* Returns a type-specific iterator on the elements of this collection.
*
*
* Note that this specification strengthens the one given in
* {@link java.lang.Iterable#iterator()}, which was already strengthened in the
* corresponding type-specific class, but was weakened by the fact that this
* interface extends {@link Collection}.
*
* @return a type-specific iterator on the elements of this collection.
*/
@Override
IntIterator iterator();
/**
* Ensures that this collection contains the specified element (optional
* operation).
*
* @see Collection#add(Object)
*/
boolean add(int key);
/**
* Returns {@code true} if this collection contains the specified element.
*
* @see Collection#contains(Object)
*/
boolean contains(int key);
/**
* Removes a single instance of the specified element from this collection, if
* it is present (optional operation).
*
*
* Note that this method should be called
* {@link java.util.Collection#remove(Object) remove()}, but the clash with the
* similarly named index-based method in the {@link java.util.List} interface
* forces us to use a distinguished name. For simplicity, the set interfaces
* reinstates {@code remove()}.
*
* @see Collection#remove(Object)
*/
boolean rem(int key);
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
default boolean add(final Integer key) {
return add((key).intValue());
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
default boolean contains(final Object key) {
if (key == null)
return false;
return contains(((Integer) (key)).intValue());
}
/**
* {@inheritDoc}
*
* @deprecated Please use (and implement) the {@code rem()} method instead.
*/
@Deprecated
@Override
default boolean remove(final Object key) {
if (key == null)
return false;
return rem(((Integer) (key)).intValue());
}
/**
* Returns a primitive type array containing the items of this collection.
*
* @return a primitive type array containing the items of this collection.
* @see Collection#toArray()
*/
int[] toIntArray();
/**
* Returns a primitive type array containing the items of this collection.
*
*
* Note that, contrarily to {@link Collection#toArray(Object[])}, this methods
* just writes all elements of this collection: no special value will be added
* after the last one.
*
* @param a
* if this array is big enough, it will be used to store this
* collection.
* @return a primitive type array containing the items of this collection.
* @see Collection#toArray(Object[])
* @deprecated Please use {@code toArray()} instead—this method is
* redundant and will be removed in the future.
*/
@Deprecated
int[] toIntArray(int a[]);
/**
* Returns an array containing all of the elements in this collection; the
* runtime type of the returned array is that of the specified array.
*
*
* Note that, contrarily to {@link Collection#toArray(Object[])}, this methods
* just writes all elements of this collection: no special value will be added
* after the last one.
*
* @param a
* if this array is big enough, it will be used to store this
* collection.
* @return a primitive type array containing the items of this collection.
* @see Collection#toArray(Object[])
*/
int[] toArray(int a[]);
/**
* Adds all elements of the given type-specific collection to this collection.
*
* @param c
* a type-specific collection.
* @see Collection#addAll(Collection)
* @return {@code true} if this collection changed as a result of the call.
*/
boolean addAll(IntCollection c);
/**
* Checks whether this collection contains all elements from the given
* type-specific collection.
*
* @param c
* a type-specific collection.
* @see Collection#containsAll(Collection)
* @return {@code true} if this collection contains all elements of the
* argument.
*/
boolean containsAll(IntCollection c);
/**
* Remove from this collection all elements in the given type-specific
* collection.
*
* @param c
* a type-specific collection.
* @see Collection#removeAll(Collection)
* @return {@code true} if this collection changed as a result of the call.
*/
boolean removeAll(IntCollection c);
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
default boolean removeIf(final java.util.function.Predicate filter) {
return removeIf((java.util.function.IntPredicate) key -> filter.test(Integer.valueOf(key)));
}
/**
* Remove from this collection all elements which satisfy the given predicate.
*
* @param filter
* a predicate which returns {@code true} for elements to be removed.
* @see Collection#removeIf(java.util.function.Predicate)
* @return {@code true} if any elements were removed.
*/
@SuppressWarnings("overloads")
default boolean removeIf(final java.util.function.IntPredicate filter) {
java.util.Objects.requireNonNull(filter);
boolean removed = false;
final IntIterator each = iterator();
while (each.hasNext()) {
if (filter.test(each.nextInt())) {
each.remove();
removed = true;
}
}
return removed;
}
/**
* Retains in this collection only elements from the given type-specific
* collection.
*
* @param c
* a type-specific collection.
* @see Collection#retainAll(Collection)
* @return {@code true} if this collection changed as a result of the call.
*/
boolean retainAll(IntCollection c);
}