if (buffer.hasArray())
                return new CharArrayReader(buffer.array());
        }
        return new StringReader(charContent.toString());
    }

    /**
     * This implementation always throws {@linkplain
     * UnsupportedOperationException}.  Subclasses can change this
     * behavior as long as the contract of {@link FileObject} is
     * obeyed.
     */
    public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
        throw new UnsupportedOperationException();
    }

    /**
     * Wraps the result of openOutputStream in a Writer.  Subclasses
     * can change this behavior as long as the contract of {@link
     * FileObject} is obeyed.
     *
     * @return a Writer wrapping the result of openOutputStream
     * @throws IllegalStateException {@inheritDoc}
     * @throws UnsupportedOperationException {@inheritDoc}
     * @throws IOException {@inheritDoc}
     */
    public Writer openWriter() throws IOException {
        return new OutputStreamWriter(openOutputStream());
    }

    /**
     * This implementation returns {@code 0L}.  Subclasses can change
     * this behavior as long as the contract of {@link FileObject} is
     * obeyed.
     *
     * @return {@code 0L}
     */
    public long getLastModified() {
        return 0L;
    }

    /**
     * This implementation does nothing.  Subclasses can change this
     * behavior as long as the contract of {@link FileObject} is
     * obeyed.
     *
     * @return {@code false}
     */
    public boolean delete() {
        return false;
    }

    /**
     * @return {@code this.kind}
     */
    public Kind getKind() {
        return kind;
    }

    /**
     * This implementation compares the path of its URI to the given
     * simple name.  This method returns true if the given kind is
     * equal to the kind of this object, and if the path is equal to
     * {@code simpleName + kind.extension} or if it ends with {@code
     * "/" + simpleName + kind.extension}.
     *
     * <p>This method calls {@link #getKind} and {@link #toUri} and
     * does not access the fields {@link #uri} and {@link #kind}
     * directly.
     *
     * <p>Subclasses can change this behavior as long as the contract
     * of {@link JavaFileObject} is obeyed.
     */
    public boolean isNameCompatible(String simpleName, Kind kind) {
        String baseName = simpleName + kind.extension;
        return kind.equals(getKind())
            && (baseName.equals(toUri().getPath())
                || toUri().getPath().endsWith("/" + baseName));
    }

    /**
     * This implementation returns {@code null}.  Subclasses can
     * change this behavior as long as the contract of
     * {@link JavaFileObject} is obeyed.
     */
    public NestingKind getNestingKind() { return null; }

    /**
     * This implementation returns {@code null}.  Subclasses can
     * change this behavior as long as the contract of
     * {@link JavaFileObject} is obeyed.
     */
    public Modifier getAccessLevel()  { return null; }

    @Override
    public String toString() {
        return uri + " from " + getClass().getSimpleName();
    }
}