commons-vfs2/src/main/java/org/apache/commons/vfs2/provider/tar/TarFileObject.java [112:136]:
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    @Override
    protected FileType doGetType() {
        return type;
    }

    /**
     * Lists the children of the file.
     */
    @Override
    protected String[] doListChildren() {
        if (!Uncheck.get(this::getType).hasChildren()) {
            return null;
        }
        return children.toArray(ArrayUtils.EMPTY_STRING_ARRAY);
    }

    /**
     * Determines if this file can be written to.
     *
     * @return {@code true} if this file is writable, {@code false} if not.
     * @throws FileSystemException if an error occurs.
     */
    @Override
    public boolean isWriteable() throws FileSystemException {
        return false;
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commons-vfs2/src/main/java/org/apache/commons/vfs2/provider/zip/ZipFileObject.java [120:144]:
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    @Override
    protected FileType doGetType() {
        return type;
    }

    /**
     * Lists the children of the file.
     */
    @Override
    protected String[] doListChildren() {
        if (!Uncheck.get(this::getType).hasChildren()) {
            return null;
        }
        return children.toArray(ArrayUtils.EMPTY_STRING_ARRAY);
    }

    /**
     * Determines if this file can be written to.
     *
     * @return {@code true} if this file is writable, {@code false} if not.
     * @throws FileSystemException if an error occurs.
     */
    @Override
    public boolean isWriteable() throws FileSystemException {
        return false;
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