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/*
* 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 it.unimi.dsi.fastutil.booleans;
import java.util.AbstractCollection;
/**
* 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 AbstractBooleanCollection extends AbstractCollection implements BooleanCollection {
protected AbstractBooleanCollection() {
}
@Override
public abstract BooleanIterator iterator();
/**
* {@inheritDoc}
*
*
* This implementation always throws an {@link UnsupportedOperationException}.
*/
@Override
public boolean add(final boolean k) {
throw new UnsupportedOperationException();
}
/**
* {@inheritDoc}
*
*
* This implementation iterates over the elements in the collection, looking for
* the specified element.
*/
@Override
public boolean contains(final boolean k) {
final BooleanIterator iterator = iterator();
while (iterator.hasNext())
if (k == iterator.nextBoolean())
return true;
return false;
}
/**
* {@inheritDoc}
*
*
* This implementation iterates over the elements in the collection, looking for
* the specified element and tries to remove it.
*/
@Override
public boolean rem(final boolean k) {
final BooleanIterator iterator = iterator();
while (iterator.hasNext())
if (k == iterator.nextBoolean()) {
iterator.remove();
return true;
}
return false;
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@SuppressWarnings("deprecation")
@Deprecated
@Override
public boolean add(final Boolean key) {
return BooleanCollection.super.add(key);
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public boolean contains(final Object key) {
return BooleanCollection.super.contains(key);
}
/**
* {@inheritDoc}
*
* @deprecated Please use the corresponding type-specific method instead.
*/
@Deprecated
@Override
public boolean remove(final Object key) {
return BooleanCollection.super.remove(key);
}
@Override
public boolean[] toArray(boolean a[]) {
if (a == null || a.length < size())
a = new boolean[size()];
BooleanIterators.unwrap(iterator(), a);
return a;
}
@Override
public boolean[] toBooleanArray() {
return toArray((boolean[]) null);
}
/**
* {@inheritDoc}
*
* @deprecated Please use {@code toArray()} instead—this method is
* redundant and will be removed in the future.
*/
@Deprecated
@Override
public boolean[] toBooleanArray(final boolean a[]) {
return toArray(a);
}
@Override
public boolean addAll(final BooleanCollection c) {
boolean retVal = false;
for (final BooleanIterator i = c.iterator(); i.hasNext();)
if (add(i.nextBoolean()))
retVal = true;
return retVal;
}
@Override
public boolean containsAll(final BooleanCollection c) {
for (final BooleanIterator i = c.iterator(); i.hasNext();)
if (!contains(i.nextBoolean()))
return false;
return true;
}
@Override
public boolean removeAll(final BooleanCollection c) {
boolean retVal = false;
for (final BooleanIterator i = c.iterator(); i.hasNext();)
if (rem(i.nextBoolean()))
retVal = true;
return retVal;
}
@Override
public boolean retainAll(final BooleanCollection c) {
boolean retVal = false;
for (final BooleanIterator i = iterator(); i.hasNext();)
if (!c.contains(i.nextBoolean())) {
i.remove();
retVal = true;
}
return retVal;
}
@Override
public String toString() {
final StringBuilder s = new StringBuilder();
final BooleanIterator i = iterator();
int n = size();
boolean k;
boolean first = true;
s.append("{");
while (n-- != 0) {
if (first)
first = false;
else
s.append(", ");
k = i.nextBoolean();
s.append(String.valueOf(k));
}
s.append("}");
return s.toString();
}
}