Class SynchronizedMap

lib/java/util/Collections.java:696–811

    }

    static class SynchronizedMap<K, V> implements Map<K, V>, Serializable {
        private static final long serialVersionUID = 1978198479659022715L;

        private final Map<K, V> m;

        final Object mutex;

        SynchronizedMap(Map<K, V> map) {
            m = map;
            mutex = this;
        }

        SynchronizedMap(Map<K, V> map, Object mutex) {
            m = map;
            this.mutex = mutex;
        }

        public void clear() {
            synchronized (mutex) {
                m.clear();
            }
        }

        public boolean containsKey(Object key) {
            synchronized (mutex) {
                return m.containsKey(key);
            }
        }

        public boolean containsValue(Object value) {
            synchronized (mutex) {
                return m.containsValue(value);
            }
        }

        public Set<Map.Entry<K, V>> entrySet() {
            synchronized (mutex) {
                return new SynchronizedSet<Map.Entry<K, V>>(m.entrySet(), mutex);
            }
        }

        @Override
        public boolean equals(Object object) {
            synchronized (mutex) {
                return m.equals(object);
            }
        }

        public V get(Object key) {
            synchronized (mutex) {
                return m.get(key);
            }
        }

        @Override
        public int hashCode() {
            synchronized (mutex) {
                return m.hashCode();