it.unimi.dsi.fastutil.shorts.AbstractShort2ShortSortedMap Maven / Gradle / Ivy
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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.shorts;
import it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterator;
/**
* An abstract class providing basic methods for sorted maps implementing a type-specific interface.
*/
public abstract class AbstractShort2ShortSortedMap extends AbstractShort2ShortMap implements Short2ShortSortedMap {
private static final long serialVersionUID = -1773560792952436569L;
protected AbstractShort2ShortSortedMap() {
}
/**
* {@inheritDoc}
*
*
* The view is backed by the sorted set returned by {@link java.util.Map#entrySet()}. Note that
* no attempt is made at caching the result of this method, as this would require adding
* some attributes that lightweight implementations would not need. Subclasses may easily override
* this policy by calling this method and caching the result, but implementors are encouraged to
* write more efficient ad-hoc implementations.
*
* @return a sorted set view of the keys of this map; it may be safely cast to a type-specific
* interface.
*/
@Override
public ShortSortedSet keySet() {
return new KeySet();
}
/** A wrapper exhibiting the keys of a map. */
protected class KeySet extends AbstractShortSortedSet {
@Override
public boolean contains(final short k) {
return containsKey(k);
}
@Override
public int size() {
return AbstractShort2ShortSortedMap.this.size();
}
@Override
public void clear() {
AbstractShort2ShortSortedMap.this.clear();
}
@Override
public ShortComparator comparator() {
return AbstractShort2ShortSortedMap.this.comparator();
}
@Override
public short firstShort() {
return firstShortKey();
}
@Override
public short lastShort() {
return lastShortKey();
}
@Override
public ShortSortedSet headSet(final short to) {
return headMap(to).keySet();
}
@Override
public ShortSortedSet tailSet(final short from) {
return tailMap(from).keySet();
}
@Override
public ShortSortedSet subSet(final short from, final short to) {
return subMap(from, to).keySet();
}
@Override
public ShortBidirectionalIterator iterator(final short from) {
return new KeySetIterator(short2ShortEntrySet().iterator(new BasicEntry(from, ((short)0))));
}
@Override
public ShortBidirectionalIterator iterator() {
return new KeySetIterator(Short2ShortSortedMaps.fastIterator(AbstractShort2ShortSortedMap.this));
}
}
/**
* A wrapper exhibiting a map iterator as an iterator on keys.
*
*
* To provide an iterator on keys, just create an instance of this class using the corresponding
* iterator on entries.
*/
protected static class KeySetIterator implements ShortBidirectionalIterator {
protected final ObjectBidirectionalIterator i;
public KeySetIterator(ObjectBidirectionalIterator i) {
this.i = i;
}
@Override
public short nextShort() {
return i.next().getShortKey();
};
@Override
public short previousShort() {
return i.previous().getShortKey();
};
@Override
public boolean hasNext() {
return i.hasNext();
}
@Override
public boolean hasPrevious() {
return i.hasPrevious();
}
}
/**
* {@inheritDoc}
*
*
* The view is backed by the sorted set returned by {@link java.util.Map#entrySet()}. Note that
* no attempt is made at caching the result of this method, as this would require adding
* some attributes that lightweight implementations would not need. Subclasses may easily override
* this policy by calling this method and caching the result, but implementors are encouraged to
* write more efficient ad-hoc implementations.
*
* @return a type-specific collection view of the values contained in this map.
*/
@Override
public ShortCollection values() {
return new ValuesCollection();
}
/** A wrapper exhibiting the values of a map. */
protected class ValuesCollection extends AbstractShortCollection {
@Override
public ShortIterator iterator() {
return new ValuesIterator(Short2ShortSortedMaps.fastIterator(AbstractShort2ShortSortedMap.this));
}
@Override
public boolean contains(final short k) {
return containsValue(k);
}
@Override
public int size() {
return AbstractShort2ShortSortedMap.this.size();
}
@Override
public void clear() {
AbstractShort2ShortSortedMap.this.clear();
}
}
/**
* A wrapper exhibiting a map iterator as an iterator on values.
*
*
* To provide an iterator on values, just create an instance of this class using the corresponding
* iterator on entries.
*/
protected static class ValuesIterator implements ShortIterator {
protected final ObjectBidirectionalIterator i;
public ValuesIterator(ObjectBidirectionalIterator i) {
this.i = i;
}
@Override
public short nextShort() {
return i.next().getShortValue();
};
@Override
public boolean hasNext() {
return i.hasNext();
}
}
}