src/main/java/org/apache/commons/io/output/ProxyCollectionWriter.java [129:158]:
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            afterWrite(end - start);
        } catch (final IOException e) {
            handleIOException(e);
        }
        return this;
    }

    /**
     * Invoked by the write methods before the call is proxied. The number of chars to be written (1 for the
     * {@link #write(int)} method, buffer length for {@link #write(char[])}, etc.) is given as an argument.
     * <p>
     * Subclasses can override this method to add common pre-processing functionality without having to override all the
     * write methods. The default implementation does nothing.
     * </p>
     *
     * @param n number of chars to be written
     * @throws IOException if the pre-processing fails
     */
    @SuppressWarnings("unused") // Possibly thrown from subclasses.
    protected void beforeWrite(final int n) throws IOException {
        // noop
    }

    /**
     * Invokes the delegate's {@code close()} method.
     *
     * @throws IOException if an I/O error occurs.
     */
    @Override
    public void close() throws IOException {
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src/main/java/org/apache/commons/io/output/ProxyWriter.java [116:147]:
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            afterWrite(end - start);
        } catch (final IOException e) {
            handleIOException(e);
        }
        return this;
    }

    /**
     * Invoked by the write methods before the call is proxied. The number
     * of chars to be written (1 for the {@link #write(int)} method, buffer
     * length for {@link #write(char[])}, etc.) is given as an argument.
     * <p>
     * Subclasses can override this method to add common pre-processing
     * functionality without having to override all the write methods.
     * The default implementation does nothing.
     * </p>
     *
     * @since 2.0
     * @param n number of chars to be written
     * @throws IOException if the pre-processing fails
     */
    @SuppressWarnings("unused") // Possibly thrown from subclasses.
    protected void beforeWrite(final int n) throws IOException {
        // noop
    }

    /**
     * Invokes the delegate's {@code close()} method.
     * @throws IOException if an I/O error occurs.
     */
    @Override
    public void close() throws IOException {
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