drv.Collection.drv Maven / Gradle / Ivy
Show all versions of fastutil Show documentation
/*
* 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.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 COLLECTION KEY_GENERIC extends Collection, KEY_ITERABLE KEY_GENERIC {
/** 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
KEY_ITERATOR KEY_GENERIC iterator();
#if KEYS_PRIMITIVE
/** Ensures that this collection contains the specified element (optional operation).
* @see Collection#add(Object)
*/
boolean add(KEY_TYPE key);
/** Returns {@code true} if this collection contains the specified element.
* @see Collection#contains(Object)
*/
boolean contains(KEY_TYPE 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(KEY_TYPE key);
/** {@inheritDoc}
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
default boolean add(final KEY_GENERIC_CLASS key) {
return add(KEY_CLASS2TYPE(key));
}
/** {@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(KEY_OBJ2TYPE(key));
}
/** {@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(KEY_OBJ2TYPE(key));
}
/** 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()
*/
KEY_TYPE[] TO_KEY_ARRAY();
/** 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
KEY_TYPE[] TO_KEY_ARRAY(KEY_TYPE 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[])
*/
KEY_TYPE[] toArray(KEY_TYPE 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(COLLECTION 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(COLLECTION 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(COLLECTION c);
#ifdef JDK_PRIMITIVE_PREDICATE
/** {@inheritDoc}
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
default boolean removeIf(final java.util.function.Predicate filter) {
return removeIf((JDK_PRIMITIVE_PREDICATE) key -> filter.test(KEY2OBJ(KEY_NARROWING(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 JDK_PRIMITIVE_PREDICATE filter) {
java.util.Objects.requireNonNull(filter);
boolean removed = false;
final KEY_ITERATOR each = iterator();
while (each.hasNext()) {
if (filter.test(each.NEXT_KEY())) {
each.remove();
removed = true;
}
}
return removed;
}
#endif
/** 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(COLLECTION c);
#endif
}