Class CheckedEntrySet

lib/java/util/Collections.java:3309–3502

Class represents a dynamically typesafe view of the specified entry set.

         * set.
         */
        private static class CheckedEntrySet<K, V> implements
                Set<Map.Entry<K, V>> {

            Set<Map.Entry<K, V>> s;

            Class<V> valueType;

            /**
             * Constructs a dynamically typesafe view of the specified entry
             * set.
             * 
             * @param s -
             *            the entry set for which a dynamically typesafe view is
             *            to be constructed.
             */
            public CheckedEntrySet(Set<Map.Entry<K, V>> s, Class<V> valueType) {
                this.s = s;
                this.valueType = valueType;
            }

            /**
             * @see java.util.Set#iterator()
             */
            public Iterator<Map.Entry<K, V>> iterator() {
                return new CheckedEntryIterator<K, V>(s.iterator(), valueType);
            }

            /**
             * @see java.util.Set#toArray()
             */
            public Object[] toArray() {
                int thisSize = size();
                Object[] array = new Object[thisSize];
                Iterator<?> it = iterator();
                for (int i = 0; i < thisSize; i++) {
                    array[i] = it.next();
                }
                return array;
            }

            /**
             * @see java.util.Set#toArray(Object[])
             */
            @SuppressWarnings("unchecked")
            public <T> T[] toArray(T[] array) {
                int thisSize = size();
                if (array.length < thisSize) {
                    Class<?> ct = array.getClass().getComponentType();
                    array = (T[]) Array.newInstance(ct, thisSize);
                }
                Iterator<?> it = iterator();
                for (int i = 0; i < thisSize; i++) {
                    array[i] = (T) it.next();
                }
                if (thisSize < array.length) {
                    array[thisSize] = null;
                }
                return array;