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/*
* Copyright (C) 2002-2023 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.AbstractCollection;
import java.util.Collection;
/**
* An abstract class providing basic methods for collections implementing a type-specific interface.
*
*
* In particular, this class provide {@link #iterator()}, {@code add()}, {@link #remove(Object)} and
* {@link #contains(Object)} methods that just call the type-specific counterpart.
*
*
* Warning: Because of a name clash between the list and collection interfaces the
* type-specific deletion method of a type-specific abstract collection is {@code rem()}, rather
* then {@code remove()}. A subclass must thus override {@code rem()}, rather than {@code remove()},
* to make all inherited methods work properly.
*/
public abstract class AbstractIntCollection extends AbstractCollection implements IntCollection {
protected AbstractIntCollection() {
}
@Override
public abstract IntIterator iterator();
/**
* {@inheritDoc}
*
* @implSpec This implementation always throws an {@link UnsupportedOperationException}.
*/
@Override
public boolean add(final int k) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*
* @implSpec This implementation iterates over the elements in the collection, looking for the
* specified element.
*/
@Override
public boolean contains(final int k) {
final IntIterator iterator = iterator();
while (iterator.hasNext()) if (k == iterator.nextInt()) return true;
return false;
}
/**
* {@inheritDoc}
*
* @implSpec This implementation iterates over the elements in the collection, looking for the
* specified element and tries to remove it.
*/
@Override
public boolean rem(final int k) {
final IntIterator iterator = iterator();
while (iterator.hasNext()) if (k == iterator.nextInt()) {
iterator.remove();
return true;
}
return false;
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public boolean add(final Integer key) {
return IntCollection.super.add(key);
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public boolean contains(final Object key) {
return IntCollection.super.contains(key);
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public boolean remove(final Object key) {
return IntCollection.super.remove(key);
}
@Override
public int[] toArray(int[] a) {
final int size = size();
if (a == null) {
a = new int[size];
} else if (a.length < size) {
a = java.util.Arrays.copyOf(a, size);
}
IntIterators.unwrap(iterator(), a);
return a;
}
@Override
public int[] toIntArray() {
final int size = size();
if (size == 0) return IntArrays.EMPTY_ARRAY;
final int a[] = new int[size];
IntIterators.unwrap(iterator(), a);
return a;
}
/**
* {@inheritDoc}
*
* @deprecated Please use {@code toArray()} instead—this method is redundant and will be
* removed in the future.
*/
@Deprecated
@Override
public int[] toIntArray(final int[] a) {
return toArray(a);
}
/**
* {@inheritDoc}
*
* @apiNote This method exists to make final what should have been final in the interface.
*/
@Override
public final void forEach(final IntConsumer action) {
IntCollection.super.forEach(action);
}
/**
* {@inheritDoc}
*
* @apiNote This method exists to make final what should have been final in the interface.
*/
@Override
public final boolean removeIf(final IntPredicate filter) {
return IntCollection.super.removeIf(filter);
}
@Override
public boolean addAll(final IntCollection c) {
boolean retVal = false;
for (final IntIterator i = c.iterator(); i.hasNext();) if (add(i.nextInt())) retVal = true;
return retVal;
}
/**
* {@inheritDoc}
*
* @implSpec This implementation delegates to the type-specific version if given a type-specific
* collection, otherwise is uses the implementation from {@link AbstractCollection}.
*/
@Override
public boolean addAll(final Collection c) {
if (c instanceof IntCollection) {
return addAll((IntCollection)c);
}
return super.addAll(c);
}
@Override
public boolean containsAll(final IntCollection c) {
for (final IntIterator i = c.iterator(); i.hasNext();) if (!contains(i.nextInt())) return false;
return true;
}
/**
* {@inheritDoc}
*
* @implSpec This implementation delegates to the type-specific version if given a type-specific
* collection, otherwise is uses the implementation from {@link AbstractCollection}.
*/
@Override
public boolean containsAll(final Collection c) {
if (c instanceof IntCollection) {
return containsAll((IntCollection)c);
}
return super.containsAll(c);
}
@Override
public boolean removeAll(final IntCollection c) {
boolean retVal = false;
for (final IntIterator i = c.iterator(); i.hasNext();) if (rem(i.nextInt())) retVal = true;
return retVal;
}
/**
* {@inheritDoc}
*
* @implSpec This implementation delegates to the type-specific version if given a type-specific
* collection, otherwise is uses the implementation from {@link AbstractCollection}.
*/
@Override
public boolean removeAll(final Collection c) {
if (c instanceof IntCollection) {
return removeAll((IntCollection)c);
}
return super.removeAll(c);
}
@Override
public boolean retainAll(final IntCollection c) {
boolean retVal = false;
for (final IntIterator i = iterator(); i.hasNext();) if (!c.contains(i.nextInt())) {
i.remove();
retVal = true;
}
return retVal;
}
/**
* {@inheritDoc}
*
* @implSpec This implementation delegates to the type-specific version if given a type-specific
* collection, otherwise is uses the implementation from {@link AbstractCollection}.
*/
@Override
public boolean retainAll(final Collection c) {
if (c instanceof IntCollection) {
return retainAll((IntCollection)c);
}
return super.retainAll(c);
}
@Override
public String toString() {
final StringBuilder s = new StringBuilder();
final IntIterator i = iterator();
int n = size();
int k;
boolean first = true;
s.append("{");
while (n-- != 0) {
if (first) first = false;
else s.append(", ");
k = i.nextInt();
s.append(String.valueOf(k));
}
s.append("}");
return s.toString();
}
}