Class UnmodifiableMap

lib/java/util/Collections.java:1201–1366

    }

    private static class UnmodifiableMap<K, V> implements Map<K, V>,
            Serializable {
        private static final long serialVersionUID = -1034234728574286014L;

        private final Map<K, V> m;

        private static class UnmodifiableEntrySet<K, V> extends
                UnmodifiableSet<Map.Entry<K, V>> {
            private static final long serialVersionUID = 7854390611657943733L;

            private static class UnmodifiableMapEntry<K, V> implements
                    Map.Entry<K, V> {
                Map.Entry<K, V> mapEntry;

                UnmodifiableMapEntry(Map.Entry<K, V> entry) {
                    mapEntry = entry;
                }

                @Override
                public boolean equals(Object object) {
                    return mapEntry.equals(object);
                }

                public K getKey() {
                    return mapEntry.getKey();
                }

                public V getValue() {
                    return mapEntry.getValue();
                }

                @Override
                public int hashCode() {
                    return mapEntry.hashCode();
                }

                public V setValue(V object) {
                    throw new UnsupportedOperationException();
                }

                @Override
                public String toString() {
                    return mapEntry.toString();
                }
            }

            UnmodifiableEntrySet(Set<Map.Entry<K, V>> set) {
                super(set);
            }

            @Override
            public Iterator<Map.Entry<K, V>> iterator() {
                return new Iterator<Map.Entry<K, V>>() {
                    Iterator<Map.Entry<K, V>> iterator = c.iterator();

                    public boolean hasNext() {
                        return iterator.hasNext();
                    }