gudusoft.gsqlparser.util.csv

Class CsvReader

Object

gudusoft.gsqlparser.util.csv.CsvReader

public class CsvReader
extends Object

A stream based parser for parsing delimited text data from a file or a stream.

Field Summary

Fields

Modifier and Type	Field and Description
static int	ESCAPE_MODE_BACKSLASH Use a backslash character before the text qualifier to represent an occurance of the text qualifier.
static int	ESCAPE_MODE_DOUBLED Double up the text qualifier to represent an occurance of the text qualifier.

Constructor Summary

Constructors

Constructor and Description
CsvReader(InputStream inputStream, char delimiter, Charset charset) Constructs a CsvReader object using an InputStream object as the data source.
CsvReader(InputStream inputStream, Charset charset) Constructs a CsvReader object using an InputStream object as the data source. Uses a comma as the column delimiter.
CsvReader(Reader inputStream) Constructs a CsvReader object using a Reader object as the data source. Uses a comma as the column delimiter.
CsvReader(Reader inputStream, char delimiter) Constructs a CsvReader object using a Reader object as the data source.
CsvReader(String fileName) Creates a CsvReader object using a file as the data source. Uses a comma as the column delimiter and ISO-8859-1 as the Charset.
CsvReader(String fileName, char delimiter) Creates a CsvReader object using a file as the data source. Uses ISO-8859-1 as the Charset.
CsvReader(String fileName, char delimiter, Charset charset) Creates a CsvReader object using a file as the data source.

Method Summary

Modifier and Type	Method and Description
void	close() Closes and releases all related resources.
protected void	finalize()
String	get(int columnIndex) Returns the current column value for a given column index.
String	get(String headerName) Returns the current column value for a given column header name.
boolean	getCaptureRawRecord()
int	getColumnCount() Gets the count of columns found in this record.
char	getComment() Gets the character being used as a comment signal.
long	getCurrentRecord() Gets the index of the current record.
char	getDelimiter() Gets the character being used as the column delimiter.
int	getEscapeMode() Gets the current way to escape an occurance of the text qualifier inside qualified data.
String	getHeader(int columnIndex) Returns the column header value for a given column index.
int	getHeaderCount() Gets the count of headers read in by a previous call to readHeaders().
String[]	getHeaders() Returns the header values as a string array.
int	getIndex(String headerName) Gets the corresponding column index for a given column header name.
String	getRawRecord()
char	getRecordDelimiter()
boolean	getSafetySwitch() Safety caution to prevent the parser from using large amounts of memory in the case where parsing settings like file encodings don't end up matching the actual format of a file.
boolean	getSkipEmptyRecords()
char	getTextQualifier() Gets the character to use as a text qualifier in the data.
boolean	getTrimWhitespace() Gets whether leading and trailing whitespace characters are being trimmed from non-textqualified column data.
boolean	getUseComments() Gets whether comments are being looked for while parsing or not.
boolean	getUseTextQualifier() Whether text qualifiers will be used while parsing or not.
String[]	getValues()
boolean	isQualified(int columnIndex)
static CsvReader	parse(String data) Creates a CsvReader object using a string of data as the source. Uses ISO-8859-1 as the Charset.
boolean	readHeaders() Read the first record of data as column headers.
boolean	readRecord() Reads another record.
void	setCaptureRawRecord(boolean captureRawRecord)
void	setComment(char comment) Sets the character to use as a comment signal.
void	setDelimiter(char delimiter) Sets the character to use as the column delimiter.
void	setEscapeMode(int escapeMode) Sets the current way to escape an occurance of the text qualifier inside qualified data.
void	setHeaders(String[] headers)
void	setRecordDelimiter(char recordDelimiter) Sets the character to use as the record delimiter.
void	setSafetySwitch(boolean safetySwitch) Safety caution to prevent the parser from using large amounts of memory in the case where parsing settings like file encodings don't end up matching the actual format of a file.
void	setSkipEmptyRecords(boolean skipEmptyRecords)
void	setTextQualifier(char textQualifier) Sets the character to use as a text qualifier in the data.
void	setTrimWhitespace(boolean trimWhitespace) Sets whether leading and trailing whitespace characters should be trimmed from non-textqualified column data or not.
void	setUseComments(boolean useComments) Sets whether comments are being looked for while parsing or not.
void	setUseTextQualifier(boolean useTextQualifier) Sets whether text qualifiers will be used while parsing or not.
boolean	skipLine() Skips the next line of data using the standard end of line characters and does not do any column delimited parsing.
boolean	skipRecord() Skips the next record of data by parsing each column. Does not increment getCurrentRecord().

Methods inherited from class Object

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

Field Detail

ESCAPE_MODE_DOUBLED

public static final int ESCAPE_MODE_DOUBLED

Double up the text qualifier to represent an occurance of the text qualifier.

See Also:

Constant Field Values

ESCAPE_MODE_BACKSLASH

public static final int ESCAPE_MODE_BACKSLASH

Use a backslash character before the text qualifier to represent an occurance of the text qualifier.

See Also:

Constant Field Values

Constructor Detail

CsvReader

public CsvReader(String fileName,
                 char delimiter,
                 Charset charset)
          throws FileNotFoundException

Creates a CsvReader object using a file as the data source.

Parameters:

fileName - The path to the file to use as the data source.

delimiter - The character to use as the column delimiter.

charset - The Charset to use while parsing the data.

Throws:

FileNotFoundException

CsvReader

public CsvReader(String fileName,
                 char delimiter)
          throws FileNotFoundException

Creates a CsvReader object using a file as the data source. Uses ISO-8859-1 as the Charset.

Parameters:

fileName - The path to the file to use as the data source.

delimiter - The character to use as the column delimiter.

Throws:

FileNotFoundException

CsvReader

public CsvReader(String fileName)
          throws FileNotFoundException

Creates a CsvReader object using a file as the data source. Uses a comma as the column delimiter and ISO-8859-1 as the Charset.

Parameters:

fileName - The path to the file to use as the data source.

Throws:

FileNotFoundException

CsvReader

public CsvReader(Reader inputStream,
                 char delimiter)

Constructs a CsvReader object using a Reader object as the data source.

Parameters:

inputStream - The stream to use as the data source.

delimiter - The character to use as the column delimiter.

CsvReader

public CsvReader(Reader inputStream)

Constructs a CsvReader object using a Reader object as the data source. Uses a comma as the column delimiter.

Parameters:

inputStream - The stream to use as the data source.

CsvReader

public CsvReader(InputStream inputStream,
                 char delimiter,
                 Charset charset)

Constructs a CsvReader object using an InputStream object as the data source.

Parameters:

inputStream - The stream to use as the data source.

delimiter - The character to use as the column delimiter.

charset - The Charset to use while parsing the data.

CsvReader

public CsvReader(InputStream inputStream,
                 Charset charset)

Constructs a CsvReader object using an InputStream object as the data source. Uses a comma as the column delimiter.

Parameters:

inputStream - The stream to use as the data source.

charset - The Charset to use while parsing the data.

Method Detail

getCaptureRawRecord

public boolean getCaptureRawRecord()

setCaptureRawRecord

public void setCaptureRawRecord(boolean captureRawRecord)

getRawRecord

public String getRawRecord()

getTrimWhitespace

public boolean getTrimWhitespace()

Gets whether leading and trailing whitespace characters are being trimmed from non-textqualified column data. Default is true.

Returns:

Whether leading and trailing whitespace characters are being trimmed from non-textqualified column data.

setTrimWhitespace

public void setTrimWhitespace(boolean trimWhitespace)

Sets whether leading and trailing whitespace characters should be trimmed from non-textqualified column data or not. Default is true.

Parameters:

trimWhitespace - Whether leading and trailing whitespace characters should be trimmed from non-textqualified column data or not.

getDelimiter

public char getDelimiter()

Gets the character being used as the column delimiter. Default is comma, ','.

Returns:

The character being used as the column delimiter.

setDelimiter

public void setDelimiter(char delimiter)

Sets the character to use as the column delimiter. Default is comma, ','.

Parameters:

delimiter - The character to use as the column delimiter.

getRecordDelimiter

public char getRecordDelimiter()

setRecordDelimiter

public void setRecordDelimiter(char recordDelimiter)

Sets the character to use as the record delimiter.

Parameters:

recordDelimiter - The character to use as the record delimiter. Default is combination of standard end of line characters for Windows, Unix, or Mac.

getTextQualifier

public char getTextQualifier()

Gets the character to use as a text qualifier in the data.

Returns:

The character to use as a text qualifier in the data.

setTextQualifier

public void setTextQualifier(char textQualifier)

Sets the character to use as a text qualifier in the data.

Parameters:

textQualifier - The character to use as a text qualifier in the data.

getUseTextQualifier

public boolean getUseTextQualifier()

Whether text qualifiers will be used while parsing or not.

Returns:

Whether text qualifiers will be used while parsing or not.

setUseTextQualifier

public void setUseTextQualifier(boolean useTextQualifier)

Sets whether text qualifiers will be used while parsing or not.

Parameters:

useTextQualifier - Whether to use a text qualifier while parsing or not.

getComment

public char getComment()

Gets the character being used as a comment signal.

Returns:

The character being used as a comment signal.

setComment

public void setComment(char comment)

Sets the character to use as a comment signal.

Parameters:

comment - The character to use as a comment signal.

getUseComments

public boolean getUseComments()

Gets whether comments are being looked for while parsing or not.

Returns:

Whether comments are being looked for while parsing or not.

setUseComments

public void setUseComments(boolean useComments)

Sets whether comments are being looked for while parsing or not.

Parameters:

useComments - Whether comments are being looked for while parsing or not.

getEscapeMode

public int getEscapeMode()

Gets the current way to escape an occurance of the text qualifier inside qualified data.

Returns:

The current way to escape an occurance of the text qualifier inside qualified data.

setEscapeMode

public void setEscapeMode(int escapeMode)
                   throws IllegalArgumentException

Sets the current way to escape an occurance of the text qualifier inside qualified data.

Parameters:

escapeMode - The way to escape an occurance of the text qualifier inside qualified data.

Throws:

IllegalArgumentException - When an illegal value is specified for escapeMode.

getSkipEmptyRecords

public boolean getSkipEmptyRecords()

setSkipEmptyRecords

public void setSkipEmptyRecords(boolean skipEmptyRecords)

getSafetySwitch

public boolean getSafetySwitch()

Safety caution to prevent the parser from using large amounts of memory in the case where parsing settings like file encodings don't end up matching the actual format of a file. This switch can be turned off if the file format is known and tested. With the switch off, the max column lengths and max column count per record supported by the parser will greatly increase. Default is true.

Returns:

The current setting of the safety switch.

setSafetySwitch

public void setSafetySwitch(boolean safetySwitch)

Safety caution to prevent the parser from using large amounts of memory in the case where parsing settings like file encodings don't end up matching the actual format of a file. This switch can be turned off if the file format is known and tested. With the switch off, the max column lengths and max column count per record supported by the parser will greatly increase. Default is true.

Parameters:

safetySwitch -

getColumnCount

public int getColumnCount()

Gets the count of columns found in this record.

Returns:

The count of columns found in this record.

getCurrentRecord

public long getCurrentRecord()

Gets the index of the current record.

Returns:

The index of the current record.

getHeaderCount

public int getHeaderCount()

Gets the count of headers read in by a previous call to readHeaders().

Returns:

The count of headers read in by a previous call to readHeaders().

getHeaders

public String[] getHeaders()
                    throws IOException

Returns the header values as a string array.

Returns:

The header values as a String array.

Throws:

IOException - Thrown if this object has already been closed.

setHeaders

public void setHeaders(String[] headers)

getValues

public String[] getValues()
                   throws IOException

Throws:

IOException

get

public String get(int columnIndex)
           throws IOException

Returns the current column value for a given column index.

Parameters:

columnIndex - The index of the column.

Returns:

The current column value.

Throws:

IOException - Thrown if this object has already been closed.

get

public String get(String headerName)
           throws IOException

Returns the current column value for a given column header name.

Parameters:

headerName - The header name of the column.

Returns:

The current column value.

Throws:

IOException - Thrown if this object has already been closed.

parse

public static CsvReader parse(String data)

Creates a CsvReader object using a string of data as the source. Uses ISO-8859-1 as the Charset.

Parameters:

data - The String of data to use as the source.

Returns:

A CsvReader object using the String of data as the source.

readRecord

public boolean readRecord()
                   throws IOException

Reads another record.

Returns:

Whether another record was successfully read or not.

Throws:

IOException - Thrown if an error occurs while reading data from the source stream.

readHeaders

public boolean readHeaders()
                    throws IOException

Read the first record of data as column headers.

Returns:

Whether the header record was successfully read or not.

Throws:

IOException - Thrown if an error occurs while reading data from the source stream.

getHeader

public String getHeader(int columnIndex)
                 throws IOException

Returns the column header value for a given column index.

Parameters:

columnIndex - The index of the header column being requested.

Returns:

The value of the column header at the given column index.

Throws:

IOException - Thrown if this object has already been closed.

isQualified

public boolean isQualified(int columnIndex)
                    throws IOException

Throws:

IOException

getIndex

public int getIndex(String headerName)
             throws IOException

Gets the corresponding column index for a given column header name.

Parameters:

headerName - The header name of the column.

Returns:

The column index for the given column header name. Returns -1 if not found.

Throws:

IOException - Thrown if this object has already been closed.

skipRecord

public boolean skipRecord()
                   throws IOException

Skips the next record of data by parsing each column. Does not increment getCurrentRecord().

Returns:

Whether another record was successfully skipped or not.

Throws:

IOException - Thrown if an error occurs while reading data from the source stream.

skipLine

public boolean skipLine()
                 throws IOException

Skips the next line of data using the standard end of line characters and does not do any column delimited parsing.

Returns:

Whether a line was successfully skipped or not.

Throws:

IOException - Thrown if an error occurs while reading data from the source stream.

close

public void close()

Closes and releases all related resources.

finalize

protected void finalize()

Overrides:

finalize in class Object