How to Separate Text File by Values in Line

Text file

• Creating text file access tool
• Functions

Text file access tool. The object allows writing to text file and reading from it.

The object work in one of the following modes:

• Reading mode
• Writing mode
• Writing/append mode

Creating text file access tool

To add text file object

1. Drag the Text File element from the Connectivity palette onto the graphical diagram. You can also drag the text files from other applications directly onto the AnyLogic graphical diagram. In this case AnyLogic automatically adds a new Text File element on the graphical diagram containing the added text file.
2. Open the text file's Properties.
3. Modify the Name of the element. This name will be used to access this element.
4. Select the object work mode: Read, Write, or Write/Append.
5. Choose the Character set, that will be used to translate bytes to and from strings.
6. Specify the text file this object will work with. If you want to modify the file located on the local computer, choose File from the Resource group of buttons and browse for the file using the Browse button. Upon selection, the source file will automatically appear in the model's Resource folder in the Projects view. This way you will be able to track the current state of the source file, switch between the absolute and relative file paths, etc.
7. If you want to read the file from some URL, choose URL from the File Type group of buttons and type the required URL in the URL edit box.
8. In the case you will read the file, specify separators that are used in the text file to separate values. Select the corresponding check boxes in the Separators group of controls. If some custom separators are used, specify them in the Custom edit box below.

You work with text files using the corresponding API of the TextFile object.

This object reads text file line by line. Class defines function getLineNumber() for getting the current line number. By default, line numbering begins at 0. This number increments at every line terminator as the data is read.

A line is considered to be terminated by any one of a line feed ('n'), a carriage return ('r'), or a carriage return followed immediately by a line feed.

In the reading mode, on each reading function call (e.g. readDouble()), TextFile advances reading position to the next value that can be read. I.e. it reads requested data and skips all trailing separatorsForReading that were specified in the constructor.

Initially, TextFile is in "not open" state: any further accessor-function call (e.g. print(double)) will open file, i.e. next reading (if in READ mode) will start reading file from its beginning, while next writing (if in WRITE mode) will start rewriting or appending (depends on mode).

TextFile has skipping functions skipChars(long) and skipTokens(int) which may be used to skip (preliminarily known) number of characters/tokens in the file.

Functions

Writing to text file

This object has the following functions that allow for writing to the text file:

Function	Description
void println()	Terminates the current line by writing the line separator string. The line separator string is defined by the system property line.separator, and is not necessarily a single newline character ('n').
void print(<Type> value)	Prints given value to the file. If numeric value is printed, the String produced by String.valueOf(value) is translated into bytes according to the chosen character encoding, and these bytes are written to the file. If the argument is null then the string null is printed.
void println(<Type> value)	Prints given value to the file and then terminates the line. This function behaves as though it invokes print(value) and then println().
void printf(java.util.Locale l, String format, Object... args)	Convenient function to write a formatted string to the text file using the specified format string and arguments. The number of arguments is variable and may be zero. l — The locale to apply during formatting. If l is null then no localization is applied. format — A format string as described in Formatter class specification. args — Arguments referenced by the format specifiers in the format string.
void printf(String format, Object... args)	Convenient function to write a formatted string to the text file using the specified format string and arguments. The number of arguments is variable and may be zero. format — A format string as described in Formatter class specification. args — Arguments referenced by the format specifiers in the format string.
void printf(String, Object...) printf(Locale, String, Object...)	Convenient function to write a formatted string to the text file using the specified format string and arguments.

Both print() and println() functions can take values of all used types: boolean, char, char[], double, double[], float, int, int[], long. Object, String, String[]. They also support printing two-dimensional arrays.

Reading text file

This object has following functions for reading the file (all these functions are only available in READ mode):

Function	Description
boolean canReadMore()	Returns true if there is available content in the file at the reading position. This function opens file for reading if it is not open.
int getLineNumber()	The function returns the current line number (1-based). 0 is returned if the file has not been opened yet (no read- and skip-functions haven't been called as well as canReadMore()). -1 is returned if the end of the file is reached.
String readLine()	Reads a line of text. Whenever a line terminator is read the current line number is incremented. If the current reading position is in the middle of line (e.g. current line is 33;Car and readInt() was called once), the rest part of line is returned (in the given example it is Car — if this TextFile has separator ;, and ;Car otherwise). The function returns a String containing the contents of the line (from current reading position), not including any line termination characters, or null if the end of the stream has been reached.
String readString()	Reads and returns a String which contains text from current reading position (which is after previously read separator), inclusive, to the next separator character position, exclusive.
boolean readBoolean()	Reads boolean string "true" or "false" (with or without quotation marks).
byte readByte()	Reads and returns number as byte.
short readShort()	Reads and returns a short value.
char readChar()	Reads and returns one character. Throws exception if there is separator in the current reading position or current text before next separator has more than one character.
int readInt()	Reads and returns an int value.
double readDouble()	Reads and returns a double value (number with floating-point and double-precision).
long readLong()	Reads and returns a long value.
float readFloat()	Reads and returns a float value (number with floating-point).

Auxiliary functions

Function	Description
long skipChars(long n)	Skip characters (as well as separator characters). The function returns the number of characters actually skipped. n — the number of characters to skip.
int skipTokens(int n)	Skips tokens (text between separators declared in the constructor). The function returns the number of tokens actually skipped. n — the number of characters to skip.
void close()	Closes the read or write stream of this TextFile and releases any system resources associated with it. Returns this object to "not open" state.
void setFile(String fileName, int mode)	Sets the new file to be used with this TextFile object. If specified file differs from previously used and the latter is not closed, it will be closed. For TextFile based on URL or on file among class resources, the only possible mode is READ. fileName — absolute path to the file, or path to file relative to current working directory, or name of file which is among resources of owner's class (if included into the class-path and lies in the owner's package) — only READ mode. Possible values of mode: READ WRITE WRITE_APPEND
void setURL(java.net.URL url)	Sets the new URL to be used with this TextFile object. This function switches TextFile to the READ mode. If specified URL differs from previously used and the stream of latter is not closed, it will be closed.
String getLocation()	Returns the location (path) of the file. If the file location hasn't been set, returns null.
void setMode(int mode)	Sets the new mode of this TextFile object. If specified mode differs from previously used and the file is not closed, it will be closed. For TextFile based on URL or on file among class resources, the only possible mode is READ. Possible values of mode: READ WRITE WRITE_APPEND

How can we improve this article?

How to Separate Text File by Values in Line

Source: https://anylogic.help/anylogic/connectivity/text-file.html

Share :