// Test that putValues overwrites existing values
        ExtractData data = new ExtractData();

        data.putValue("key", "old_value");
        String[] oldValues = data.getValues("key");
        assertEquals(1, oldValues.length);
        assertEquals("old_value", oldValues[0]);

        String[] newValues = { "new_value1", "new_value2" };
        data.putValues("key", newValues);

        } else {
            final Object oldValue = dataMap.get(key);
            final Object[] oldValues;
            if (oldValue instanceof Object[]) {
                oldValues = (Object[]) oldValue;
            } else if (oldValue instanceof Collection<?>) {
                oldValues = ((Collection<?>) oldValue).toArray();
            } else {
                oldValues = new Object[] { oldValue };
            }

        return parent.remove(toCamelCase(key), value);
    }

    @Override
    public boolean replace(final K key, final V oldValue, final V newValue) {
        if (parent.replace(key, oldValue, newValue)) {
            return true;
        }
        return parent.replace(key, oldValue, newValue);
    }

    @Override
    public V replace(final K key, final V value) {
        // use original key

     * @return the original element
     */
    public E set(final int index, final E element) {
        final Entry entry = getEntry(index);
        final E oldValue = entry.element;
        entry.element = element;
        return oldValue;
    }

    /**
     * Returns the position of the element.
     *
     * @param element the element
     * @return the position
     */

            for (final Map<String, Object> doc : docs) {
                final Object oldIdValue = doc.get(fessConfig.getIndexFieldId());
                if (oldIdValue != null && !idValue.equals(oldIdValue)) {
                    final Object oldDocIdValue = doc.get(fessConfig.getIndexFieldDocId());
                    if (oldDocIdValue != null) {

        @Override
        public V getValue() {
            return value;
        }

        @Override
        public V setValue(final V value) {
            final V oldValue = this.value;
            this.value = value;
            return oldValue;
        }

        /**
         * Clears the state.
         */
        public void clear() {
            key = null;
            value = null;