org.knime.base.node.io.filereader
Class FileAnalyzer
java.lang.Object
org.knime.base.node.io.filereader.FileAnalyzer
public final class FileAnalyzer
- extends Object
Provides functionality for analyzing an ASCII data file to create default
settings. It tries to figure out what kind of delimiters and comments the
file contains - honoring fixed pre-settings passed in.
- Author:
- Peter Ohl, University of Konstanz
Nested Class Summary |
(package private) static class |
FileAnalyzer.HeaderHelper
Little helper class for the check header method. |
Field Summary |
(package private) static int |
NUMOFLINES
If the analysis is cut short, we look only at the first couple of lines. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
NUMOFLINES
static final int NUMOFLINES
- If the analysis is cut short, we look only at the first couple of lines.
We look at as many lines as the preview table will read in as its first
chunk.
- See Also:
- Constant Field Values
analyze
public static FileReaderNodeSettings analyze(FileReaderNodeSettings userSettings,
ExecutionMonitor exec)
throws IOException
- Tries to guess FileReader settings for the passed data file. It will use
the settings in the settings object (if any - but the file location is
required), and will read in the first lines from the file. It will first
detect comment characters (if the first lines start with '#' or '%'), and
then guess the delimiter (',', ';', or space) depending on which cuts a
line into (more than one) tokens.
- Parameters:
userSettings
- containing the URL of the file to examine and
settings that should be used and considered fixed.exec
- used to check for cancellations and to report progress. Could
be null. If a FileReaderExecutionMonitor
is provided
it is distinguished between user cancellations cutting the
analysis short, and interrupts that return immediately and
return null as result.
- Returns:
- settings that supposably provide more or less useful results. It
will always be a non-null object - but may not contain any
settings if guessing was just too hard.
- Throws:
IOException
- if there was an error reading from the URL
Copyright, 2003 - 2010. All rights reserved.
University of Konstanz, Germany.
Chair for Bioinformatics and Information Mining, Prof. Dr. Michael R. Berthold.
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