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/*
Copyright (c) 2007 Health Market Science, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA
You can contact Health Market Science at info@healthmarketscience.com
or at the following address:
Health Market Science
2700 Horizon Drive
Suite 200
King of Prussia, PA 19406
*/
package com.healthmarketscience.jackcess;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
*
* @author Frank Gerbig
*/
public class ExportUtil {
private static final Log LOG = LogFactory.getLog(ExportUtil.class);
public static final String DEFAULT_DELIMITER = ",";
public static final char DEFAULT_QUOTE_CHAR = '"';
public static final String DEFAULT_FILE_EXT = "csv";
private ExportUtil() {
}
/**
* Copy all tables into new delimited text files <br>
* Equivalent to: {@code exportAll(db, dir, "csv");}
*
* @param db
* Database the table to export belongs to
* @param dir
* The directory where the new files will be created
*
* @see #exportAll(Database,File,String)
*/
public static void exportAll(Database db, File dir)
throws IOException {
exportAll(db, dir, DEFAULT_FILE_EXT);
}
/**
* Copy all tables into new delimited text files <br>
* Equivalent to: {@code exportFile(db, name, f, false, null, '"',
* SimpleExportFilter.INSTANCE);}
*
* @param db
* Database the table to export belongs to
* @param dir
* The directory where the new files will be created
* @param ext
* The file extension of the new files
*
* @see #exportFile(Database,String,File,boolean,String,char,ExportFilter)
*/
public static void exportAll(Database db, File dir,
String ext) throws IOException {
for (String tableName : db.getTableNames()) {
exportFile(db, tableName, new File(dir, tableName + "." + ext), false,
DEFAULT_DELIMITER, DEFAULT_QUOTE_CHAR, SimpleExportFilter.INSTANCE);
}
}
/**
* Copy all tables into new delimited text files <br>
* Equivalent to: {@code exportFile(db, name, f, false, null, '"',
* SimpleExportFilter.INSTANCE);}
*
* @param db
* Database the table to export belongs to
* @param dir
* The directory where the new files will be created
* @param ext
* The file extension of the new files
* @param header
* If <code>true</code> the first line contains the column names
*
* @see #exportFile(Database,String,File,boolean,String,char,ExportFilter)
*/
public static void exportAll(Database db, File dir,
String ext, boolean header)
throws IOException {
for (String tableName : db.getTableNames()) {
exportFile(db, tableName, new File(dir, tableName + "." + ext), header,
DEFAULT_DELIMITER, DEFAULT_QUOTE_CHAR, SimpleExportFilter.INSTANCE);
}
}
/**
* Copy all tables into new delimited text files <br>
* Equivalent to: {@code exportFile(db, name, f, false, null, '"',
* SimpleExportFilter.INSTANCE);}
*
* @param db
* Database the table to export belongs to
* @param dir
* The directory where the new files will be created
* @param ext
* The file extension of the new files
* @param header
* If <code>true</code> the first line contains the column names
* @param delim
* The column delimiter, <code>null</code> for default (comma)
* @param quote
* The quote character
* @param filter
* valid export filter
*
* @see #exportFile(Database,String,File,boolean,String,char,ExportFilter)
*/
public static void exportAll(Database db, File dir,
String ext, boolean header, String delim,
char quote, ExportFilter filter)
throws IOException {
for (String tableName : db.getTableNames()) {
exportFile(db, tableName, new File(dir, tableName + "." + ext), header,
delim, quote, filter);
}
}
/**
* Copy a table into a new delimited text file <br>
* Equivalent to: {@code exportFile(db, name, f, false, null, '"',
* SimpleExportFilter.INSTANCE);}
*
* @param db
* Database the table to export belongs to
* @param tableName
* Name of the table to export
* @param f
* New file to create
*
* @see #exportFile(Database,String,File,boolean,String,char,ExportFilter)
*/
public static void exportFile(Database db, String tableName,
File f) throws IOException {
exportFile(db, tableName, f, false, DEFAULT_DELIMITER, DEFAULT_QUOTE_CHAR,
SimpleExportFilter.INSTANCE);
}
/**
* Copy a table into a new delimited text file <br>
* Nearly equivalent to: {@code exportWriter(db, name, new BufferedWriter(f),
* header, delim, quote, filter);}
*
* @param db
* Database the table to export belongs to
* @param tableName
* Name of the table to export
* @param f
* New file to create
* @param header
* If <code>true</code> the first line contains the column names
* @param delim
* The column delimiter, <code>null</code> for default (comma)
* @param quote
* The quote character
* @param filter
* valid export filter
*
* @see #exportWriter(Database,String,BufferedWriter,boolean,String,char,ExportFilter)
*/
public static void exportFile(Database db, String tableName,
File f, boolean header, String delim, char quote,
ExportFilter filter) throws IOException {
BufferedWriter out = null;
try {
out = new BufferedWriter(new FileWriter(f));
exportWriter(db, tableName, out, header, delim, quote, filter);
out.close();
} finally {
if (out != null) {
try {
out.close();
} catch (Exception ex) {
LOG.warn("Could not close file " + f.getAbsolutePath(), ex);
}
}
}
}
/**
* Copy a table in this database into a new delimited text file <br>
* Equivalent to: {@code exportWriter(db, name, out, false, null, '"',
* SimpleExportFilter.INSTANCE);}
*
* @param db
* Database the table to export belongs to
* @param tableName
* Name of the table to export
* @param out
* Writer to export to
*
* @see #exportWriter(Database,String,BufferedWriter,boolean,String,char,ExportFilter)
*/
public static void exportWriter(Database db, String tableName,
BufferedWriter out) throws IOException {
exportWriter(db, tableName, out, false, DEFAULT_DELIMITER,
DEFAULT_QUOTE_CHAR, SimpleExportFilter.INSTANCE);
}
/**
* Copy a table in this database into a new delimited text file. <br>
* Equivalent to: {@code exportWriter(Cursor.createCursor(db.getTable(tableName)), out, header, delim, quote, filter);}
*
* @param db
* Database the table to export belongs to
* @param tableName
* Name of the table to export
* @param out
* Writer to export to
* @param header
* If <code>true</code> the first line contains the column names
* @param delim
* The column delimiter, <code>null</code> for default (comma)
* @param quote
* The quote character
* @param filter
* valid export filter
*
* @see #exportWriter(Cursor,BufferedWriter,boolean,String,char,ExportFilter)
*/
public static void exportWriter(Database db, String tableName,
BufferedWriter out, boolean header, String delim,
char quote, ExportFilter filter)
throws IOException
{
exportWriter(Cursor.createCursor(db.getTable(tableName)), out, header,
delim, quote, filter);
}
/**
* Copy a table in this database into a new delimited text file.
*
* @param cursor
* Cursor to export
* @param out
* Writer to export to
* @param header
* If <code>true</code> the first line contains the column names
* @param delim
* The column delimiter, <code>null</code> for default (comma)
* @param quote
* The quote character
* @param filter
* valid export filter
*/
public static void exportWriter(Cursor cursor,
BufferedWriter out, boolean header, String delim,
char quote, ExportFilter filter)
throws IOException
{
String delimiter = (delim == null) ? DEFAULT_DELIMITER : delim;
// create pattern which will indicate whether or not a value needs to be
// quoted or not (contains delimiter, separator, or newline)
Pattern needsQuotePattern = Pattern.compile(
"(?:" + Pattern.quote(delimiter) + ")|(?:" +
Pattern.quote("" + quote) + ")|(?:[\n\r])");
List<Column> origCols = cursor.getTable().getColumns();
List<Column> columns = new ArrayList<Column>(origCols);
columns = filter.filterColumns(columns);
Collection<String> columnNames = null;
if(!origCols.equals(columns)) {
// columns have been filtered
columnNames = new HashSet<String>();
for (Column c : columns) {
columnNames.add(c.getName());
}
}
// print the header row (if desired)
if (header) {
for (Iterator<Column> iter = columns.iterator(); iter.hasNext();) {
writeValue(out, iter.next().getName(), quote, needsQuotePattern);
if (iter.hasNext()) {
out.write(delimiter);
}
}
out.newLine();
}
// print the data rows
Map<String, Object> row;
Object[] unfilteredRowData = new Object[columns.size()];
while ((row = cursor.getNextRow(columnNames)) != null) {
// fill raw row data in array
for (int i = 0; i < columns.size(); i++) {
unfilteredRowData[i] = row.get(columns.get(i).getName());
}
// apply filter
Object[] rowData = filter.filterRow(unfilteredRowData);
// print row
for (int i = 0; i < columns.size(); i++) {
Object obj = rowData[i];
if(obj != null) {
String value = null;
if(obj instanceof byte[]) {
value = ByteUtil.toHexString((byte[])obj);
} else {
value = String.valueOf(rowData[i]);
}
writeValue(out, value, quote, needsQuotePattern);
}
if (i < columns.size() - 1) {
out.write(delimiter);
}
}
out.newLine();
}
out.flush();
}
private static void writeValue(BufferedWriter out, String value, char quote,
Pattern needsQuotePattern)
throws IOException
{
if(!needsQuotePattern.matcher(value).find()) {
// no quotes necessary
out.write(value);
return;
}
// wrap the value in quotes and handle internal quotes
out.write(quote);
for (int i = 0; i < value.length(); ++i) {
char c = value.charAt(i);
if (c == quote) {
out.write(quote);
}
out.write(c);
}
out.write(quote);
}
}
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