/*
 * Copyright (c) 2017, 2020, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */


















package jdk.internal.vm.compiler.collections;

Unmodifiable memory efficient map. See EconomicMap for the underlying data structure and its properties.
Since:19.0
/** * Unmodifiable memory efficient map. See {@link EconomicMap} for the underlying data structure and * its properties. * * @since 19.0 */
public interface UnmodifiableEconomicMap<K, V> {
Returns the value to which key is mapped, or null if this map contains no mapping for key. The key must not be null.
Since:19.0
/** * Returns the value to which {@code key} is mapped, or {@code null} if this map contains no * mapping for {@code key}. The {@code key} must not be {@code null}. * * @since 19.0 */
V get(K key);
Returns the value to which key is mapped, or defaultValue if this map contains no mapping for key. The key must not be null.
Since:19.0
/** * Returns the value to which {@code key} is mapped, or {@code defaultValue} if this map * contains no mapping for {@code key}. The {@code key} must not be {@code null}. * * @since 19.0 */
default V get(K key, V defaultValue) { V v = get(key); if (v == null) { return defaultValue; } return v; }
Returns true if this map contains a mapping for key. Returns always false if the key is null.
Since:19.0
/** * Returns {@code true} if this map contains a mapping for {@code key}. Returns always * {@code false} if the {@code key} is {@code null}. * * @since 19.0 */
boolean containsKey(K key);
Returns the number of key-value mappings in this map.
Since:19.0
/** * Returns the number of key-value mappings in this map. * * @since 19.0 */
int size();
Returns true if this map contains no key-value mappings.
Since:19.0
/** * Returns {@code true} if this map contains no key-value mappings. * * @since 19.0 */
boolean isEmpty();
Returns a Iterable view of the values contained in this map.
Since:19.0
/** * Returns a {@link Iterable} view of the values contained in this map. * * @since 19.0 */
Iterable<V> getValues();
Returns a Iterable view of the keys contained in this map.
Since:19.0
/** * Returns a {@link Iterable} view of the keys contained in this map. * * @since 19.0 */
Iterable<K> getKeys();
Returns a UnmodifiableMapCursor view of the mappings contained in this map.
Since:19.0
/** * Returns a {@link UnmodifiableMapCursor} view of the mappings contained in this map. * * @since 19.0 */
UnmodifiableMapCursor<K, V> getEntries(); }