com.univocity.parsers.common.input
Class WriterCharAppender

java.lang.Object
  com.univocity.parsers.common.input.DefaultCharAppender
      com.univocity.parsers.common.input.ExpandingCharAppender
          com.univocity.parsers.common.input.WriterCharAppender

All Implemented Interfaces:

CharAppender, CharSequence

public class WriterCharAppender
extends ExpandingCharAppender

Extension of the DefaultCharAppender class to include facilities for writing to an output. Used by writers extending AbstractWriter.

This class introduces the handling of the normalized newline character defined in Format.getNormalizedNewline() and converts it to the newline sequence in Format.getLineSeparator()

It also introduces methods to write to an instance of Writer directly to avoid unnecessary String instantiations.

Author:

uniVocity Software Pty Ltd - parsers@univocity.com

See Also:

Format, AbstractWriter

Constructor Summary

WriterCharAppender(int maxLength, String emptyValue, Format format)
Creates a WriterCharAppender with: a maximum limit of characters to append the default value to return when no characters have been accumulated. the basic Format specification for handling newlines The padding character is defaulted to a whitespace character ' '.

Method Summary

void	append(char ch) Appends the given character.
void	appendIgnoringPadding(char ch, char padding) Appends the given character and marks it as ignored if it is a padding character
void	appendIgnoringWhitespace(char ch) Appends the given character and marks it as ignored if it is a whitespace (ch <= ' ')
void	appendIgnoringWhitespaceAndPadding(char ch, char padding) Appends the given character and marks it as ignored if it is a whitespace (ch <= ' ') or a padding character
void	appendNewLine() Appends the newline character sequence specified in Format.getLineSeparator()
void	enableDenormalizedLineEndings(boolean enableDenormalizedLineEndings) Configures the appender to allow line ending sequences to be appended as-is, without replacing them by the normalized line separator character.
void	writeCharsAndReset(Writer writer) Writes the accumulated value to the Writer, discarding any trailing whitespace characters identified when using appendIgnoringWhitespace(char), appendIgnoringPadding(char, char) or appendIgnoringWhitespaceAndPadding(char, char)

Methods inherited from class com.univocity.parsers.common.input.ExpandingCharAppender

append, append, append, appendUntil, appendUntil, appendUntil, fill, prepend, prepend

Methods inherited from class com.univocity.parsers.common.input.DefaultCharAppender

append, append, charAt, getAndReset, getChars, getCharsAndReset, length, reset, resetWhitespaceCount, subSequence, toString, updateWhitespace, whitespaceCount

Methods inherited from class java.lang.Object

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

Constructor Detail

WriterCharAppender

public WriterCharAppender(int maxLength,
                          String emptyValue,
                          Format format)

Creates a WriterCharAppender with:

• a maximum limit of characters to append
• the default value to return when no characters have been accumulated.
• the basic Format specification for handling newlines

The padding character is defaulted to a whitespace character ' '.

Parameters:

maxLength - maximum limit of characters to append

emptyValue - default value to return when no characters have been accumulated

format - output format specification used for newline handling

Method Detail

appendIgnoringWhitespace

public final void appendIgnoringWhitespace(char ch)

Appends the given character and marks it as ignored if it is a whitespace (ch <= ' ')

If the given character is equal to Format.getNormalizedNewline(), then the character sequence returned by Format.getLineSeparator() is going to be appended.

Specified by:

appendIgnoringWhitespace in interface CharAppender

Overrides:

appendIgnoringWhitespace in class ExpandingCharAppender

Parameters:

ch - character to append

appendIgnoringPadding

public final void appendIgnoringPadding(char ch,
                                        char padding)

Appends the given character and marks it as ignored if it is a padding character

If the given character is equal to Format.getNormalizedNewline(), then the character sequence returned by Format.getLineSeparator() is going to be appended.

Specified by:

appendIgnoringPadding in interface CharAppender

Overrides:

appendIgnoringPadding in class ExpandingCharAppender

Parameters:

ch - character to append

padding - the padding character

appendIgnoringWhitespaceAndPadding

public final void appendIgnoringWhitespaceAndPadding(char ch,
                                                     char padding)

Appends the given character and marks it as ignored if it is a whitespace (ch <= ' ') or a padding character

If the given character is equal to Format.getNormalizedNewline(), then the character sequence returned by Format.getLineSeparator() is going to be appended.

Specified by:

appendIgnoringWhitespaceAndPadding in interface CharAppender

Overrides:

appendIgnoringWhitespaceAndPadding in class ExpandingCharAppender

Parameters:

ch - character to append

padding - the padding character

append

public final void append(char ch)

Appends the given character.

If the given character is equal to Format.getNormalizedNewline(), then the character sequence returned by Format.getLineSeparator() is going to be appended.

Specified by:

append in interface CharAppender

Overrides:

append in class ExpandingCharAppender

Parameters:

ch - the character to append

writeCharsAndReset

public final void writeCharsAndReset(Writer writer)
                              throws IOException

Writes the accumulated value to the Writer, discarding any trailing whitespace characters identified when using appendIgnoringWhitespace(char), appendIgnoringPadding(char, char) or appendIgnoringWhitespaceAndPadding(char, char)

The internal accumulated value is discarded after invoking this method (as in DefaultCharAppender.reset())

If the accumulated value is empty (i.e. no characters were appended, or all appended characters where ignored as whitespace or padding), then the written value will be the DefaultCharAppender.emptyValue attribute defined in the constructor of this class.

Parameters:

writer - the output writer

Throws:

IOException - if an error occurs while writing to the output.

appendNewLine

public final void appendNewLine()

Appends the newline character sequence specified in Format.getLineSeparator()

enableDenormalizedLineEndings

public final void enableDenormalizedLineEndings(boolean enableDenormalizedLineEndings)

Configures the appender to allow line ending sequences to be appended as-is, without replacing them by the normalized line separator character.

Parameters:

enableDenormalizedLineEndings - flag indicating whether denormalized line endings are allowed. The writer won't convert line separators automatically.