org.apache.jackrabbit.oak.commons

Class FileIOUtils

java.lang.Object

org.apache.jackrabbit.oak.commons.FileIOUtils

public final class FileIOUtils
extends Object

Simple File utils

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FileIOUtils.BurnOnCloseFileIterator<T> Implements a Closeable wrapper over a LineIterator.
static class	FileIOUtils.FileLineDifferenceIterator FileLineDifferenceIterator class which iterates over the difference of 2 files line by line.
static class	FileIOUtils.TransformingComparator Decorates the given comparator and applies the function before delegating to the decorated comparator.

Field Summary

Fields

Modifier and Type	Field and Description
static Comparator<String>	lexComparator
static Function<String,String>	passThruTransformer

Method Summary

Modifier and Type	Method and Description
static void	append(List<File> files, File appendTo, boolean delete) Appends the contents of the list of files to the given file and deletes the files if the delete flag is enabled.
static File	copy(InputStream stream) Copies an input stream to a file.
static void	copyInputStreamToFile(InputStream source, File destination) Copy the input stream to the given file.
static Comparator<String>	lineBreakAwareComparator(Comparator<String> delegate) Composing iterator which unescapes for line breaks and delegates to the given comparator.
static void	merge(List<File> files, File output) Merges a list of files after sorting with the lexComparator.
static void	merge(List<File> files, File output, Comparator<String> comparator) Merges a list of files after sorting with the given comparator.
static Set<String>	readStringsAsSet(InputStream stream, boolean unescape) Reads strings from the given stream into a set and optionally unescaping for line breaks.
static void	sort(File file) Sorts the given file externally using the lexComparator and removes duplicates.
static void	sort(File file, Comparator<String> comparator) Sorts the given file externally with the given comparator and removes duplicates.
static void	writeAsLine(BufferedWriter writer, String str, boolean escape) Writes a string as a new line into the given buffered writer and optionally escapes the line for line breaks.
static int	writeStrings(Iterator<String> iterator, File f, boolean escape) Writes string from the given iterator to the given file and optionally escape the written strings for line breaks.
static int	writeStrings(Iterator<String> iterator, File f, boolean escape, @NotNull Function<String,String> transformer, @Nullable org.slf4j.Logger logger, @Nullable String message) Writes string from the given iterator to the given file and optionally escape the written strings for line breaks.
static int	writeStrings(Iterator<String> iterator, File f, boolean escape, @Nullable org.slf4j.Logger logger, @Nullable String message) Writes string from the given iterator to the given file and optionally escape the written strings for line breaks.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

lexComparator

public static final Comparator<String> lexComparator

passThruTransformer

public static final Function<String,String> passThruTransformer

Method Detail

sort

public static void sort(File file)
                 throws IOException

Sorts the given file externally using the lexComparator and removes duplicates.

Parameters:

file - file whose contents needs to be sorted

Throws:

IOException

sort

public static void sort(File file,
                        Comparator<String> comparator)
                 throws IOException

Sorts the given file externally with the given comparator and removes duplicates.

Parameters:

file - file whose contents needs to be sorted

comparator - to compare

Throws:

IOException

merge

public static void merge(List<File> files,
                         File output)
                  throws IOException

Merges a list of files after sorting with the lexComparator.

Parameters:

files - files to merge

output - merge output file

Throws:

IOException

merge

public static void merge(List<File> files,
                         File output,
                         Comparator<String> comparator)
                  throws IOException

Merges a list of files after sorting with the given comparator.

Parameters:

files - files to merge

output - merge output file

Throws:

IOException

copy

public static File copy(InputStream stream)
                 throws IOException

Copies an input stream to a file.

Parameters:

stream - steam to copy

Returns:

Throws:

IOException

append

public static void append(List<File> files,
                          File appendTo,
                          boolean delete)
                   throws IOException

Appends the contents of the list of files to the given file and deletes the files if the delete flag is enabled. If there is a scope for lines in the files containing line break characters it should be ensured that the files are written with writeAsLine(BufferedWriter, String, boolean) with true to escape line break characters.

Parameters:

files -

appendTo -

Throws:

IOException

writeAsLine

public static void writeAsLine(BufferedWriter writer,
                               String str,
                               boolean escape)
                        throws IOException

Writes a string as a new line into the given buffered writer and optionally escapes the line for line breaks.

Parameters:

writer - to write the string

str - the string to write

escape - whether to escape string for line breaks

Throws:

IOException

writeStrings

public static int writeStrings(Iterator<String> iterator,
                               File f,
                               boolean escape)
                        throws IOException

Writes string from the given iterator to the given file and optionally escape the written strings for line breaks.

Parameters:

iterator - the source of the strings

f - file to write to

escape - whether to escape for line breaks

Returns:

count

Throws:

IOException

writeStrings

public static int writeStrings(Iterator<String> iterator,
                               File f,
                               boolean escape,
                               @Nullable
                               @Nullable org.slf4j.Logger logger,
                               @Nullable
                               @Nullable String message)
                        throws IOException

Writes string from the given iterator to the given file and optionally escape the written strings for line breaks.

Parameters:

iterator - the source of the strings

f - file to write to

escape - escape whether to escape for line breaks

logger - logger to log progress

message - message to log

Returns:

Throws:

IOException

writeStrings

public static int writeStrings(Iterator<String> iterator,
                               File f,
                               boolean escape,
                               @NotNull
                               @NotNull Function<String,String> transformer,
                               @Nullable
                               @Nullable org.slf4j.Logger logger,
                               @Nullable
                               @Nullable String message)
                        throws IOException

Writes string from the given iterator to the given file and optionally escape the written strings for line breaks.

Parameters:

iterator - the source of the strings

f - file to write to

escape - escape whether to escape for line breaks

transformer - any transformation on the input

logger - logger to log progress

message - message to log

Returns:

Throws:

IOException

readStringsAsSet

public static Set<String> readStringsAsSet(InputStream stream,
                                           boolean unescape)
                                    throws IOException

Reads strings from the given stream into a set and optionally unescaping for line breaks.

Parameters:

stream - the source of the strings

unescape - whether to unescape for line breaks

Returns:

set

Throws:

IOException

lineBreakAwareComparator

public static Comparator<String> lineBreakAwareComparator(Comparator<String> delegate)

Composing iterator which unescapes for line breaks and delegates to the given comparator. When using this it should be ensured that the data source has been correspondingly escaped.

Parameters:

delegate - the actual comparison iterator

Returns:

comparator aware of line breaks

copyInputStreamToFile

public static void copyInputStreamToFile(InputStream source,
                                         File destination)
                                  throws IOException

Copy the input stream to the given file. Delete the file in case of exception.

Parameters:

source - the input stream source

destination - the file to write to

Throws:

IOException