2 * (C) Copyright 2016 Pantheon Technologies, s.r.o. and others.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
16 package org.opendaylight.yangtools.triemap;
18 import java.util.AbstractMap.SimpleImmutableEntry;
19 import java.util.Iterator;
20 import java.util.Map.Entry;
21 import java.util.NoSuchElementException;
24 * Mimic immutable ListMap in Scala
26 * @author Roman Levenstein <romixlev@gmail.com>
30 final class ListMap<K, V> {
34 // Modified during remove0 only
35 private ListMap<K, V> next;
37 private ListMap(final K k, final V v) {
41 private ListMap(final K k, final V v, final ListMap<K, V> next) {
47 static <K,V> ListMap<K, V> map(final K k1, final V v1, final K k2, final V v2) {
48 return new ListMap<>(k1, v1, new ListMap<>(k2, v2));
52 return next == null ? 1 : next.size() + 1;
55 Option<V> get(final K key) {
57 return Option.makeOption(v);
59 return next == null ? Option.makeOption() : next.get(key);
62 ListMap<K,V> add(final K key, final V value) {
63 return new ListMap<>(key, value, remove(key));
66 ListMap<K, V> remove(final K key) {
74 private boolean contains(final K key) {
75 if (key.equals(this.k)) {
79 return next != null && next.contains(key);
82 private ListMap<K, V> remove0(final K key) {
83 ListMap<K, V> n = this;
84 ListMap<K, V> ret = null;
85 ListMap<K, V> lastN = null;
87 if (key.equals(n.k)) {
93 lastN.next = new ListMap<>(n.k, n.v);
96 ret = new ListMap<>(n.k, n.v);
104 Iterator<Entry<K, V>> iterator() {
105 return new NodeIterator<>(this);
108 static final class NodeIterator<K,V> implements Iterator<Entry<K, V>> {
109 private ListMap<K, V> n;
111 NodeIterator(final ListMap<K, V> n) {
116 public boolean hasNext() {
121 public Entry<K, V> next() {
123 throw new NoSuchElementException();
126 final Entry<K, V> res = new SimpleImmutableEntry<>(n.k, n.v);