com.rapidminer.example.table
Class RapidMinerLineReader

java.lang.Object
  com.rapidminer.example.table.RapidMinerLineReader

public class RapidMinerLineReader
extends java.lang.Object

A simple line converter for reading data from BufferedReaders. Each line is separated into columns using a pattern matcher based on regular expressions. In addition, comments might be also defined. Everything after a comment character is completely ignored. Quotes might also be used. If a columns starts with a quote (") the end of the quoted region is searched and the corresponding columns build a new column which replaces the old ones. Quoting is added for compatibility reasons only. Since parsing is slower if quoting is used, quotes should not be used at all. If possible please use and define a column separator which is not part of your data.

Author:

Ingo Mierswa

Constructor Summary

RapidMinerLineReader(java.lang.String separatorsRegExpr, char[] commentChars, boolean useQuotes, char quoteChar, char escapeChar, boolean trimLines, boolean skipErrorLines)
Indicates if quoting (") can be used to form.

Method Summary

java.lang.String[]

readLine(java.io.BufferedReader in, int expectedNumberOfColumns) Ignores comment and empty lines and returns the first line not starting with a comment.

Methods inherited from class java.lang.Object

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

Constructor Detail

RapidMinerLineReader

public RapidMinerLineReader(java.lang.String separatorsRegExpr,
                            char[] commentChars,
                            boolean useQuotes,
                            char quoteChar,
                            char escapeChar,
                            boolean trimLines,
                            boolean skipErrorLines)

Indicates if quoting (") can be used to form.

Method Detail

readLine

public java.lang.String[] readLine(java.io.BufferedReader in,
                                   int expectedNumberOfColumns)
                            throws java.io.IOException

Ignores comment and empty lines and returns the first line not starting with a comment. Returns null if no such line exists. Throws an IOException if the line does not provide the given expected number of columns. This check will not be performed if the given parameter value is -1.

Throws:

java.io.IOException