fr.ifremer.coser.storage

Class DataStorages

java.lang.Object

fr.ifremer.coser.storage.DataStorages

public class DataStorages
extends Object

Useful methods around DataStorage. TODO Should move here all others methods storage-centric from CommonService. Created on 3/7/14.

Since:

1.5

Author:

Tony Chemit - chemit@codelutin.com

Constructor Summary

Constructors

Constructor and Description
DataStorages()

Method Summary

Methods

Modifier and Type	Method and Description
static DataStorage	load(File file) Load a csv file using the default csv char separator (CoserConstants.CSV_SEPARATOR_CHAR).
static DataStorage	load(File file, char separator) Load a csv file using the given csv char separator.
static <P extends com.google.common.base.Predicate<String[]>> boolean	match(DataStorage storage, P predicate, boolean skipHeader) //TODO Use a walker
static File	save(DataStorage dataStorage, String prefix, String suffix) Save a datastorage to a file and return its.
static void	save(DataStorage dataStorage, Writer writer) Save a datastorage to a writer.
static <P extends com.google.common.base.Predicate<String[]>> DataStorage	sub(DataStorage storage, P predicate, String... header) Gets a sub storage of all matching rows for the given predicate on the given storage.
static String	toString(DataStorage storage)
static <P extends com.google.common.base.Predicate<String[]>,W extends DataStorageWalker> void	walk(DataStorage storage, P predicate, W walker)
static <W extends DataStorageWalker> void	walk(DataStorage storage, W walker)

Methods inherited from class java.lang.Object

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

Constructor Detail

DataStorages

public DataStorages()

Method Detail

load

public static DataStorage load(File file)

Load a csv file using the default csv char separator (CoserConstants.CSV_SEPARATOR_CHAR).

Parameters:

file - file to load

Returns:

data storage with file content

load

public static DataStorage load(File file,
               char separator)

Load a csv file using the given csv char separator.

Parameters:

file - file to load

separator - separator to use to load file

Returns:

data storage with file content

save

public static File save(DataStorage dataStorage,
        String prefix,
        String suffix)
                 throws CoserTechnicalException

Save a datastorage to a file and return its. The file is temporary file (will be deleted at the end life of the jvm), his name is generated then using the File.createTempFile(String, String) using the given prefix and suffix.

Parameters:

dataStorage - the storage to save

prefix - prefix of generated file name

suffix - suffix of generated file name

Returns:

the file where the storage was saved

Throws:

CoserTechnicalException

toString

public static String toString(DataStorage storage)

save

public static void save(DataStorage dataStorage,
        Writer writer)
                 throws CoserTechnicalException

Save a datastorage to a writer.

Parameters:

dataStorage - the storage to save

writer - where to save storage

Throws:

CoserTechnicalException

match

public static <P extends com.google.common.base.Predicate<String[]>> boolean match(DataStorage storage,
                                                                   P predicate,
                                                                   boolean skipHeader)

//TODO Use a walker

Type Parameters:

P - type of predicate

Parameters:

storage - the storage to test

predicate - predicate to match at least on one row

skipHeader - to skip the header of storage

Returns:

true if a row matchs the predicate

Since:

1.5

sub

public static <P extends com.google.common.base.Predicate<String[]>> DataStorage sub(DataStorage storage,
                                                                     P predicate,
                                                                     String... header)

Gets a sub storage of all matching rows for the given predicate on the given storage. The result header is the given one in parameter header.

Type Parameters:

P - type of predicate

Parameters:

storage - storage to read

predicate - predicate to match rows to include in sub storage

header - new header to use

Returns:

the sub storage

walk

public static <W extends DataStorageWalker> void walk(DataStorage storage,
                                      W walker)

walk

public static <P extends com.google.common.base.Predicate<String[]>,W extends DataStorageWalker> void walk(DataStorage storage,
                                                                                           P predicate,
                                                                                           W walker)