src.it.unimi.dsi.fastutil.doubles.Double2ReferenceMap Maven / Gradle / Ivy
/* Generic definitions */
/* Assertions (useful to generate conditional code) */
/* Current type and class (and size, if applicable) */
/* Value methods */
/* Interfaces (keys) */
/* Interfaces (values) */
/* Abstract implementations (keys) */
/* Abstract implementations (values) */
/* Static containers (keys) */
/* Static containers (values) */
/* Implementations */
/* Synchronized wrappers */
/* Unmodifiable wrappers */
/* Other wrappers */
/* Methods (keys) */
/* Methods (values) */
/* Methods (keys/values) */
/* Methods that have special names depending on keys (but the special names depend on values) */
/* Equality */
/* Object/Reference-only definitions (keys) */
/* Primitive-type-only definitions (keys) */
/* Object/Reference-only definitions (values) */
/*
* Copyright (C) 2002-2013 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.doubles;
import it.unimi.dsi.fastutil.objects.ReferenceCollection;
import it.unimi.dsi.fastutil.objects.ObjectSet;
import it.unimi.dsi.fastutil.objects.ObjectIterator;
import java.util.Map;
/** A type-specific {@link Map}; provides some additional methods that use polymorphism to avoid (un)boxing, and handling of a default return value.
*
* Besides extending the corresponding type-specific {@linkplain it.unimi.dsi.fastutil.Function function}, this interface strengthens {@link #entrySet()},
* {@link #keySet()} and {@link #values()}. Maps returning entry sets of type {@link FastEntrySet} support also fast iteration.
*
*
A submap or subset may or may not have an
* independent default return value (which however must be initialized to the
* default return value of the originator).
*
* @see Map
*/
public interface Double2ReferenceMap extends Double2ReferenceFunction , Map {
/** An entry set providing fast iteration.
*
* In some cases (e.g., hash-based classes) iteration over an entry set requires the creation
* of a large number of {@link java.util.Map.Entry} objects. Some fastutil
* maps might return {@linkplain #entrySet() entry set} objects of type FastEntrySet: in this case, {@link #fastIterator() fastIterator()}
* will return an iterator that is guaranteed not to create a large number of objects, possibly
* by returning always the same entry (of course, mutated).
*/
public interface FastEntrySet extends ObjectSet > {
/** Returns a fast iterator over this entry set; the iterator might return always the same entry object, suitably mutated.
*
* @return a fast iterator over this entry set; the iterator might return always the same {@link java.util.Map.Entry} object, suitably mutated.
*/
public ObjectIterator > fastIterator();
}
/** Returns a set view of the mappings contained in this map.
* Note that this specification strengthens the one given in {@link Map#entrySet()}.
*
* @return a set view of the mappings contained in this map.
* @see Map#entrySet()
*/
ObjectSet> entrySet();
/** Returns a type-specific set view of the mappings contained in this map.
*
* This method is necessary because there is no inheritance along
* type parameters: it is thus impossible to strengthen {@link #entrySet()}
* so that it returns an {@link it.unimi.dsi.fastutil.objects.ObjectSet}
* of objects of type {@link java.util.Map.Entry} (the latter makes it possible to
* access keys and values with type-specific methods).
*
* @return a type-specific set view of the mappings contained in this map.
* @see #entrySet()
*/
ObjectSet > double2ReferenceEntrySet();
/** Returns a set view of the keys contained in this map.
* Note that this specification strengthens the one given in {@link Map#keySet()}.
*
* @return a set view of the keys contained in this map.
* @see Map#keySet()
*/
DoubleSet keySet();
/** Returns a set view of the values contained in this map.
*
Note that this specification strengthens the one given in {@link Map#values()}.
*
* @return a set view of the values contained in this map.
* @see Map#values()
*/
ReferenceCollection values();
/** A type-specific {@link java.util.Map.Entry}; provides some additional methods
* that use polymorphism to avoid (un)boxing.
*
* @see java.util.Map.Entry
*/
interface Entry extends Map.Entry {
/**
* @see java.util.Map.Entry#getKey()
*/
double getDoubleKey();
}
}