/*
* Copyright (C) 2002-2019 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.objects;
import it.unimi.dsi.fastutil.bytes.ByteCollection;
import it.unimi.dsi.fastutil.bytes.AbstractByteCollection;
import it.unimi.dsi.fastutil.bytes.ByteIterator;
import it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterator;
import java.util.Comparator;
An abstract class providing basic methods for sorted maps implementing a
type-specific interface.
/**
* An abstract class providing basic methods for sorted maps implementing a
* type-specific interface.
*/
public abstract class AbstractObject2ByteSortedMap<K> extends AbstractObject2ByteMap<K>
implements
Object2ByteSortedMap<K> {
private static final long serialVersionUID = -1773560792952436569L;
protected AbstractObject2ByteSortedMap() {
}
{@inheritDoc}
The view is backed by the sorted set returned by 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.
Returns: a sorted set view of the keys of this map; it may be safely cast to a
type-specific interface.
/**
* {@inheritDoc}
*
* <p>
* The view is backed by the sorted set returned by
* {@link java.util.Map#entrySet()}. Note that <em>no attempt is made at caching
* the result of this method</em>, 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 ObjectSortedSet<K> keySet() {
return new KeySet();
}
A wrapper exhibiting the keys of a map. /** A wrapper exhibiting the keys of a map. */
protected class KeySet extends AbstractObjectSortedSet<K> {
@Override
public boolean contains(final Object k) {
return containsKey(k);
}
@Override
public int size() {
return AbstractObject2ByteSortedMap.this.size();
}
@Override
public void clear() {
AbstractObject2ByteSortedMap.this.clear();
}
@Override
public Comparator<? super K> comparator() {
return AbstractObject2ByteSortedMap.this.comparator();
}
@Override
public K first() {
return firstKey();
}
@Override
public K last() {
return lastKey();
}
@Override
public ObjectSortedSet<K> headSet(final K to) {
return headMap(to).keySet();
}
@Override
public ObjectSortedSet<K> tailSet(final K from) {
return tailMap(from).keySet();
}
@Override
public ObjectSortedSet<K> subSet(final K from, final K to) {
return subMap(from, to).keySet();
}
@Override
public ObjectBidirectionalIterator<K> iterator(final K from) {
return new KeySetIterator<>(object2ByteEntrySet().iterator(new BasicEntry<>(from, ((byte) 0))));
}
@Override
public ObjectBidirectionalIterator<K> iterator() {
return new KeySetIterator<>(Object2ByteSortedMaps.fastIterator(AbstractObject2ByteSortedMap.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.
/**
* A wrapper exhibiting a map iterator as an iterator on keys.
*
* <p>
* To provide an iterator on keys, just create an instance of this class using
* the corresponding iterator on entries.
*/
protected static class KeySetIterator<K> implements ObjectBidirectionalIterator<K> {
protected final ObjectBidirectionalIterator<Object2ByteMap.Entry<K>> i;
public KeySetIterator(ObjectBidirectionalIterator<Object2ByteMap.Entry<K>> i) {
this.i = i;
}
@Override
public K next() {
return i.next().getKey();
};
@Override
public K previous() {
return i.previous().getKey();
};
@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 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.
Returns: a type-specific collection view of the values contained in this map.
/**
* {@inheritDoc}
*
* <p>
* The view is backed by the sorted set returned by
* {@link java.util.Map#entrySet()}. Note that <em>no attempt is made at caching
* the result of this method</em>, 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 ByteCollection values() {
return new ValuesCollection();
}
A wrapper exhibiting the values of a map. /** A wrapper exhibiting the values of a map. */
protected class ValuesCollection extends AbstractByteCollection {
@Override
public ByteIterator iterator() {
return new ValuesIterator<>(Object2ByteSortedMaps.fastIterator(AbstractObject2ByteSortedMap.this));
}
@Override
public boolean contains(final byte k) {
return containsValue(k);
}
@Override
public int size() {
return AbstractObject2ByteSortedMap.this.size();
}
@Override
public void clear() {
AbstractObject2ByteSortedMap.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.
/**
* A wrapper exhibiting a map iterator as an iterator on values.
*
* <p>
* To provide an iterator on values, just create an instance of this class using
* the corresponding iterator on entries.
*/
protected static class ValuesIterator<K> implements ByteIterator {
protected final ObjectBidirectionalIterator<Object2ByteMap.Entry<K>> i;
public ValuesIterator(ObjectBidirectionalIterator<Object2ByteMap.Entry<K>> i) {
this.i = i;
}
@Override
public byte nextByte() {
return i.next().getByteValue();
};
@Override
public boolean hasNext() {
return i.hasNext();
}
}
}