de.alpharogroup.file.csv.CsvFileExtensions Maven / Gradle / Ivy
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Project that holds utility class for file operations.
/**
* The MIT License
*
* Copyright (C) 2007 Asterios Raptis
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package de.alpharogroup.file.csv;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;
import java.util.StringTokenizer;
import lombok.experimental.ExtensionMethod;
import de.alpharogroup.file.write.WriteFileExtensions;
import de.alpharogroup.io.StreamExtensions;
import de.alpharogroup.string.StringExtensions;
/**
* Utility class for the use of cvs-files.
*
* @version 1.0
* @author Asterios Raptis
*/
@ExtensionMethod(StringExtensions.class)
public final class CsvFileExtensions
{
/**
* Reads every line from the File splits the data through a comma and puts them to the List.
*
* @param input
* The File from where the input comes.
* @param encoding
* The encoding from the file.
* @return The List with all lines from the file.
*/
public static List formatKommaSeperatedFileToList(final File input,
final String encoding)
{
// The List where the data from every line from the File to put.
final List output = new ArrayList<>();
BufferedReader reader = null;
try
{
// create the bufferedreader
reader = (BufferedReader)StreamExtensions.getReader(input, encoding, false);
// the line.
String line = null;
// read all lines from the file
do
{
line = reader.readLine();
// if null break the loop
if (line == null)
{
break;
}
// Split the line
final String[] splittedData = line.split(",");
// Iterate throuh the array
for (final String element : splittedData)
{
// add the line to the list
output.add(element.trim());
}
}
while (true);
}
catch (final UnsupportedEncodingException e)
{
e.printStackTrace();
}
catch (final FileNotFoundException e)
{
e.printStackTrace();
}
catch (final IOException e)
{
e.printStackTrace();
}
finally
{
StreamExtensions.closeReader(reader);
}
// return the list with all lines from the file.
return output;
}
/**
* Formats the List that contains String-object to a csv-file wich is plus-minus 100 characters
* in every line.
*
* @param list
* The List with the Strings.
* @return The String produced from the List.
*/
private static String formatListToString(final List list)
{
int lineLength = 0;
final StringBuffer sb = new StringBuffer();
for (final String str : list)
{
final int length = str.length();
lineLength = length + lineLength;
sb.append(str);
sb.append(", ");
if (100 < lineLength)
{
sb.append("\n");
lineLength = 0;
}
}
return sb.toString().trim();
}
/**
* Formats a file that has in every line one input-data into a csv-file.
*
* @param input
* The input-file to format. The current format from the file is every data in a
* line.
* @param output
* The file where the formatted data should be inserted.
* @param encoding
* the encoding
* @throws IOException
* When an io error occurs.
*/
public static void formatToCSV(final File input, final File output, final String encoding)
throws IOException
{
final List list = readLinesInList(input, "UTF-8");
final String sb = formatListToString(list);
WriteFileExtensions.writeStringToFile(output, sb, encoding);
}
/**
* Gets the given cvs file as list of maps. Every map has as key the header from the column and
* the corresponding value for this line.
*
* @param input
* the input
* @return the cvs as list map
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static List> getCvsAsListMap(final File input) throws IOException
{
final List lines = CsvFileExtensions.readFileToList(input, ";", "UTF-8");
final List> data = new ArrayList<>();
final String[] headline = lines.remove(0);
for (final String[] line : lines)
{
final Map context = new LinkedHashMap<>();
final String[] currentLine = line;
for (int j = 0; j < currentLine.length; j++)
{
context.put(headline[j], currentLine[j]);
}
data.add(context);
}
return data;
}
/**
* Gets the data from line.
*
* @param line
* the line
* @param seperator
* the seperator
* @return the data from line
*/
public static String[] getDataFromLine(final String line, final String seperator)
{
return getDataFromLine(line, seperator, false);
}
/**
* Gets the data from line.
*
* @param line
* the line
* @param seperator
* the seperator
* @param trim
* the trim
* @return the data from line
*/
public static String[] getDataFromLine(final String line, final String seperator,
final boolean trim)
{
final StringTokenizer tokenizer = new StringTokenizer(line, seperator);
final List data = new ArrayList<>();
while (tokenizer.hasMoreElements())
{
final String string = tokenizer.nextToken();
if (trim)
{
data.add(string.trim());
}
else
{
data.add(string);
}
}
final String[] splittedLine = data.toArray(new String[0]);
return splittedLine;
}
/**
* Gets the line count from csv file.
*
* @param file
* the file
* @return the line count from csv file
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static int getLineCountFromCsvFile(final File file) throws IOException
{
return readFileToList(file).size();
}
/**
* Reads from a csv-file the field from the given position and puts them to the List.
*
* @param input
* The input-file.
* @param position
* The position from the field.
* @param putFirstLine
* Flag that tells if the first line will be put in the list.
* @param encoding
* the encoding
* @return The list with the data.
* @throws IOException
* When a io-problem occurs.
*/
public static List readDataFromCVSFileToList(final File input, final int position,
final boolean putFirstLine, final String encoding) throws IOException
{
final List output = new ArrayList<>();
BufferedReader reader = null;
try
{
// create the bufferedreader
reader = (BufferedReader)StreamExtensions.getReader(input, encoding, false);
// the line.
String line = null;
// read all lines from the file
do
{
line = reader.readLine();
// if null break the loop
if (line == null)
{
break;
}
// Split the line
final String[] splittedData = line.split(",");
// get the data with the index
if (position < splittedData.length - 1)
{
final String s = splittedData[position].removeQuotationMarks();
output.add(s);
}
else
{
break;
}
}
while (true);
}
catch (final IOException e)
{
throw e;
}
finally
{
StreamExtensions.closeReader(reader);
}
// return the list with all lines from the file.
if (putFirstLine)
{
output.remove(0);
}
return output;
}
/**
* Reads from a csv-file the field from the given position and puts them to the List.
*
* @param input
* The input-file.
* @param position
* The position from the field.
* @param putFirstLine
* Flag that tells if the first line will be put in the list.
* @param splitChar
* the split char
* @param encoding
* the encoding
* @return The list with the data.
* @throws IOException
* When a io-problem occurs.
*/
public static List readDataFromCVSFileToList(final File input, final int position,
final boolean putFirstLine, final String splitChar, final String encoding)
throws IOException
{
final List output = new ArrayList<>();
BufferedReader reader = null;
try
{
// create the bufferedreader
reader = (BufferedReader)StreamExtensions.getReader(input, encoding, false);
// the line.
String line = null;
// read all lines from the file
do
{
line = reader.readLine();
// if null break the loop
if (line == null)
{
break;
}
// Split the line
final String[] splittedData = line.split(splitChar);
// get the data with the index
if (position <= splittedData.length - 1)
{
final String s = splittedData[position].removeQuotationMarks();
output.add(s);
}
}
while (true);
}
catch (final IOException e)
{
throw e;
}
finally
{
StreamExtensions.closeReader(reader);
}
// return the list with all lines from the file.
if (putFirstLine)
{
output.remove(0);
}
return output;
}
/**
* Read filelist to properties.
*
* @param input
* the input
* @return the properties
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static Properties readFilelistToProperties(final File input) throws IOException
{
final List list = readLinesInList(input, null);
final Properties prop = new Properties();
for (int i = 0; i < list.size(); i++)
{
final String element = list.get(i);
prop.put(i + "", element);
}
return prop;
}
/**
* Reads every line from the given File into a List and returns the List.
*
* @param file
* The file from where to read.
* @return The List with all lines from the File.
* @throws IOException
* When a io-problem occurs.
*/
public static List readFileToList(final File file) throws IOException
{
return readFileToList(file, null);
}
/**
* Reads every line from the given File into a List and returns the List.
*
* @param file
* The file from where to read.
* @param encoding
* The encoding to read.
* @return The List with all lines from the File.
* @throws IOException
* When a io-problem occurs.
*/
public static List readFileToList(final File file, final String encoding)
throws IOException
{
final List fn = new ArrayList<>();
BufferedReader reader = null;
try
{
// create a reader
reader = (BufferedReader)StreamExtensions.getReader(file, encoding, false);
// the line.
String line = null;
// read all lines from the file
do
{
line = reader.readLine();
// if null break the loop
if (line == null)
{
break;
}
fn.add(line);
}
while (true);
}
catch (final IOException e)
{
throw e;
}
finally
{
StreamExtensions.closeReader(reader);
}
return fn;
}
/**
* Reads every line from the given File into a List of String arrays and returns the List.
*
* @param file
* The file from where to read.
* @param seperator
* the seperator
* @param encoding
* The encoding to read.
* @return The List with all lines from the File.
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static List readFileToList(final File file, final String seperator,
final String encoding) throws IOException
{
final List fn = new ArrayList<>();
BufferedReader reader = null;
try
{
// create a reader
reader = (BufferedReader)StreamExtensions.getReader(file, encoding, false);
// the line.
String line = null;
// read all lines from the file
do
{
line = reader.readLine();
// if null break the loop
if (line == null)
{
break;
}
final String[] splittedLine = getDataFromLine(line, seperator);
fn.add(splittedLine);
}
while (true);
}
catch (final IOException e)
{
throw e;
}
finally
{
StreamExtensions.closeReader(reader);
}
return fn;
}
/**
* Reads every line from the File and puts them to the List.
*
* @param input
* The File from where the input comes.
* @param encoding
* The encoding from the file.
* @return The List with all lines from the file.
* @throws IOException
* When a io-problem occurs.
*/
public static List readLinesInList(final File input, final String encoding)
throws IOException
{
// The List where the lines from the File to put.
final List output = new ArrayList<>();
BufferedReader reader = null;
try
{
// create the bufferedreader
reader = (BufferedReader)StreamExtensions.getReader(input, encoding, false);
// the line.
String line = null;
// read all lines from the file
do
{
line = reader.readLine();
// if null break the loop
if (line == null)
{
break;
}
// add the line to the list
output.add(line);
}
while (true);
}
catch (final IOException e)
{
throw e;
}
finally
{
StreamExtensions.closeReader(reader);
}
// return the list with all lines from the file.
return output;
}
/**
* Read an csv-file and puts them in a String-array.
*
* @param csvData
* The csv-file with the data.
* @param encoding
* The encoding to read.
* @return The data from the csv-file as a String-array.
* @throws FileNotFoundException
* the file not found exception
* @throws IOException
* When an io-error occurs.
*/
public static String[] sortData(final File csvData, final String encoding)
throws FileNotFoundException, IOException
{
final List fn = new ArrayList<>();
BufferedReader reader = null;
try
{
// create a reader
reader = (BufferedReader)StreamExtensions.getReader(csvData, encoding, false);
// the line.
String line = null;
int index, last;
// read all lines from the file
do
{
line = reader.readLine();
// if null break the loop
if (line == null)
{
break;
}
// initialize the last
last = 0;
// get the index from the comma
index = line.indexOf(',');
while (index != -1)
{
// get the next firstname and remove the whitespaces.
final String firstname = line.substring(last, index).trim();
// added to the list
fn.add(firstname);
// set last to the next position
last = index + 1;
// get the next index from the comma in the line
index = line.indexOf(',', last);
}
}
while (true);
}
catch (final IOException e)
{
throw e;
}
finally
{
StreamExtensions.closeReader(reader);
}
// convert the list to a String array.
final String data[] = fn.toArray(new String[fn.size()]);
// and sort the array.
Arrays.sort(data);
return data;
}
/**
* Stores a komma seperated file to a properties object. As key is the number from the counter.
*
* @param output
* the output
* @param input
* the input
* @param comments
* the comments
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static void storeFilelistToProperties(final File output, final File input,
final String comments) throws IOException
{
final Properties prop = readFilelistToProperties(input);
final OutputStream out = StreamExtensions.getOutputStream(output, true);
prop.store(out, comments);
StreamExtensions.closeOutputStream(out);
}
/**
* Writes the toString() value of each item in a collection to the specified File line by line.
* The default VM encoding and the default line ending will be used.
*
* @param output
* The File where the values to save.
* @param values
* The Set with the values to put into the file.
* @param encoding
* The encoding from the file.
* @throws IOException
* When a io-problem occurs.
*/
public static void writeLines(final File output, final Set values,
final String encoding) throws IOException
{
writeLinesToFile(values, output, encoding);
}
/**
* Writes all the String-object in the collection into the given file.
*
* @param collection
* The collection with the String-object.
* @param output
* The file where the String-object will be writing.
* @param encoding
* The encoding from the file.
*/
public static void writeLinesToFile(final Collection collection, final File output,
final String encoding)
{
final StringBuffer sb = new StringBuffer();
for (final String element : collection)
{
sb.append(element);
sb.append("\n");
}
WriteFileExtensions.writeStringToFile(output, sb.toString(), encoding);
}
/**
* Private constructor.
*/
private CsvFileExtensions()
{
super();
}
}
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