impl/maven-xml/src/main/java/org/apache/maven/internal/xml/ImmutableCollections.java [489:608]:
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                    entries[idx++] = new SimpleImmutableEntry<>(e.getKey(), e.getValue());
                }
            } else {
                entries = new Object[0];
            }
        }

        @Override
        public Set<Entry<K, V>> entrySet() {
            return new AbstractImmutableSet<Entry<K, V>>() {
                @Override
                public Iterator<Entry<K, V>> iterator() {
                    return new Iterator<Entry<K, V>>() {
                        int index = 0;

                        @Override
                        public boolean hasNext() {
                            return index < entries.length;
                        }

                        @SuppressWarnings("unchecked")
                        @Override
                        public Entry<K, V> next() {
                            if (index < entries.length) {
                                return (Entry<K, V>) entries[index++];
                            }
                            throw new NoSuchElementException();
                        }
                    };
                }

                @Override
                public int size() {
                    return entries.length;
                }
            };
        }
    }

    private abstract static class AbstractImmutableMap<K, V> extends AbstractMap<K, V> implements Serializable {
        @Override
        public void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) {
            throw uoe();
        }

        @Override
        public V putIfAbsent(K key, V value) {
            throw uoe();
        }

        @Override
        public boolean remove(Object key, Object value) {
            throw uoe();
        }

        @Override
        public boolean replace(K key, V oldValue, V newValue) {
            throw uoe();
        }

        @Override
        public V replace(K key, V value) {
            throw uoe();
        }

        @Override
        public V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) {
            throw uoe();
        }

        @Override
        public V computeIfPresent(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
            throw uoe();
        }

        @Override
        public V compute(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
            throw uoe();
        }

        @Override
        public V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction) {
            throw uoe();
        }
    }

    private abstract static class AbstractImmutableSet<E> extends AbstractSet<E> implements Serializable {
        @Override
        public boolean removeAll(Collection<?> c) {
            throw uoe();
        }

        @Override
        public boolean add(E e) {
            throw uoe();
        }

        @Override
        public boolean remove(Object o) {
            throw uoe();
        }

        @Override
        public boolean retainAll(Collection<?> c) {
            throw uoe();
        }

        @Override
        public void clear() {
            throw uoe();
        }

        @Override
        public boolean removeIf(Predicate<? super E> filter) {
            throw uoe();
        }
    }

    private static UnsupportedOperationException uoe() {
        return new UnsupportedOperationException();
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src/mdo/java/ImmutableCollections.java [492:611]:
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                    entries[idx++] = new SimpleImmutableEntry<>(e.getKey(), e.getValue());
                }
            } else {
                entries = new Object[0];
            }
        }

        @Override
        public Set<Entry<K, V>> entrySet() {
            return new AbstractImmutableSet<Entry<K, V>>() {
                @Override
                public Iterator<Entry<K, V>> iterator() {
                    return new Iterator<Entry<K, V>>() {
                        int index = 0;

                        @Override
                        public boolean hasNext() {
                            return index < entries.length;
                        }

                        @SuppressWarnings("unchecked")
                        @Override
                        public Entry<K, V> next() {
                            if (index < entries.length) {
                                return (Entry<K, V>) entries[index++];
                            }
                            throw new NoSuchElementException();
                        }
                    };
                }

                @Override
                public int size() {
                    return entries.length;
                }
            };
        }
    }

    private abstract static class AbstractImmutableMap<K, V> extends AbstractMap<K, V> implements Serializable {
        @Override
        public void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) {
            throw uoe();
        }

        @Override
        public V putIfAbsent(K key, V value) {
            throw uoe();
        }

        @Override
        public boolean remove(Object key, Object value) {
            throw uoe();
        }

        @Override
        public boolean replace(K key, V oldValue, V newValue) {
            throw uoe();
        }

        @Override
        public V replace(K key, V value) {
            throw uoe();
        }

        @Override
        public V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) {
            throw uoe();
        }

        @Override
        public V computeIfPresent(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
            throw uoe();
        }

        @Override
        public V compute(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) {
            throw uoe();
        }

        @Override
        public V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction) {
            throw uoe();
        }
    }

    private abstract static class AbstractImmutableSet<E> extends AbstractSet<E> implements Serializable {
        @Override
        public boolean removeAll(Collection<?> c) {
            throw uoe();
        }

        @Override
        public boolean add(E e) {
            throw uoe();
        }

        @Override
        public boolean remove(Object o) {
            throw uoe();
        }

        @Override
        public boolean retainAll(Collection<?> c) {
            throw uoe();
        }

        @Override
        public void clear() {
            throw uoe();
        }

        @Override
        public boolean removeIf(Predicate<? super E> filter) {
            throw uoe();
        }
    }

    private static UnsupportedOperationException uoe() {
        return new UnsupportedOperationException();
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