Class CheckedMap

lib/java/util/Collections.java:3089–3504

Class represents a dynamically typesafe view of the specified map.

     * Class represents a dynamically typesafe view of the specified map.
     */
    private static class CheckedMap<K, V> implements Map<K, V>, Serializable {

        private static final long serialVersionUID = 5742860141034234728L;

        Map<K, V> m;

        Class<K> keyType;

        Class<V> valueType;

        /**
         * Constructs a dynamically typesafe view of the specified map.
         * 
         * @param m -
         *            the map for which a dynamically typesafe view is to be
         *            constructed.
         */
        private CheckedMap(Map<K, V> m, Class<K> keyType, Class<V> valueType) {
            if (m == null || keyType == null || valueType == null) {
                throw new NullPointerException();
            }
            this.m = m;
            this.keyType = keyType;
            this.valueType = valueType;
        }

        /**
         * @see java.util.Map#size()
         */
        public int size() {
            return m.size();
        }

        /**
         * @see java.util.Map#isEmpty()
         */
        public boolean isEmpty() {
            return m.isEmpty();
        }

        /**
         * @see java.util.Map#containsKey(Object)
         */
        public boolean containsKey(Object key) {
            return m.containsKey(key);
        }

        /**
         * @see java.util.Map#containsValue(Object)
         */
        public boolean containsValue(Object value) {
            return m.containsValue(value);
        }

        /**
         * @see java.util.Map#get(Object)
         */
        public V get(Object key) {