com.xj.anylogic.engine.connectivity
Class TextFile

java.lang.Object
  com.xj.anylogic.engine.connectivity.TextFile

All Implemented Interfaces:

com.xj.anylogic.engine.internal.Child, java.io.Serializable

public class TextFile
extends java.lang.Object
implements java.io.Serializable, com.xj.anylogic.engine.internal.Child

Text File access utility

Write mode description:
This object has following methods for writing to the file:

• print(value) - prints given value to the file: print(double), print(String), etc.
• println() - prints line-separator to the file
• println(value) - prints given value, followed by line-separator, to the file: println(double), println(String), etc.
• printf(String, Object...) and printf(Locale, String, Object...) - convenience methods to write a formatted string to the text file using the specified format string and arguments

Read mode description:
This object reads text file line by line. Class defines method 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 method 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.

Common information:
Initially, TextFile is in 'not open' state: any further accessor-method call (e.g. print(double)) will open file, i.e.

• next reading (if in READ mode) will start reading file from its beginning
• next writing (if in WRITE mode) will start rewriting or appending (depends on mode)

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

Author:

XJ Technologies Company Ltd. www.anylogic.com

See Also:

Serialized Form

Field Summary

static int	READ 'read' mode
static int	WRITE 'write' mode
static int	WRITE_APPEND 'write/append' mode

Constructor Summary

TextFile(Presentable owner, java.lang.String packagePrefix, int mode, java.lang.String fileName, java.lang.String charsetName, char[] separatorsForReading)
Creates new TextFile object based on given name of file

TextFile(Presentable owner, java.lang.String packagePrefix, java.net.URL url, java.lang.String charsetName, char[] separatorsForReading)
Creates new TextFile object in READ mode, based on given URL

Method Summary

boolean	canReadMore() Returns true if there is available content in the file at the reading position.
void	close() Closes the read or write stream of this TextFile and releases any system resources associated with it.
int	getLineNumber() Get the current line number.
void	print(boolean b) Prints a boolean value.
void	print(char c) Prints a character.
void	print(char[] s) Prints an array of characters.
void	print(double d) Prints a double-precision floating-point number.
void	print(float f) Prints a floating-point number.
void	print(int i) Prints an integer.
void	print(long l) Prints a long integer.
void	print(java.lang.Object obj) Prints an object.
void	print(java.lang.String s) Prints a string.
void	printf(java.util.Locale l, java.lang.String format, java.lang.Object... args) A convenient method to write a formatted string to the text file using the specified format string and arguments.
void	printf(java.lang.String format, java.lang.Object... args) A convenient method to write a formatted string to the text file using the specified format string and arguments.
void	println() Terminates the current line by writing the line separator string.
void	println(boolean x) Prints a boolean value and then terminates the line.
void	println(char x) Prints a character and then terminates the line.
void	println(char[] x) Prints an array of characters and then terminates the line.
void	println(double x) Prints a double-precision floating-point number and then terminates the line.
void	println(float x) Prints a floating-point number and then terminates the line.
void	println(int x) Prints an integer and then terminates the line.
void	println(long x) Prints a long integer and then terminates the line.
void	println(java.lang.Object x) Prints an Object and then terminates the line.
void	println(java.lang.String x) Prints a String and then terminates the line.
boolean	readBoolean() Reads boolean string "true" or "false" (with or without quotation marks)
byte	readByte() Reads and returns number as byte.
char	readChar() Reads and returns one character.
double	readDouble() Reads and returns a double value (number with floating-point and double-precision).
float	readFloat() Reads and returns a float value (number with floating-point).
int	readInt() Reads and returns an int value.
java.lang.String	readLine() Read a line of text.
long	readLong() Reads and returns a long value.
short	readShort() Reads and returns a short value.
java.lang.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
void	restoreOwner(java.lang.Object owner) This method normally should not be called by user This method restores owner of this object The method is used in snapshot saving/loading
void	setFile(java.lang.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
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
void	setURL(java.net.URL url) Sets the new url to be used with this TextFile object This method 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
long	skipChars(long n) Skip characters (as well as separator characters).
int	skipTokens(int n) Skips tokens (texts between separators declared in the constructor)
java.lang.String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

READ

public static final int READ

'read' mode

See Also:

Constant Field Values

WRITE

public static final int WRITE

'write' mode

See Also:

Constant Field Values

WRITE_APPEND

public static final int WRITE_APPEND

'write/append' mode

See Also:

Constant Field Values

Constructor Detail

TextFile

public TextFile(Presentable owner,
                java.lang.String packagePrefix,
                int mode,
                java.lang.String fileName,
                java.lang.String charsetName,
                char[] separatorsForReading)

Creates new TextFile object based on given name of file

Parameters:

owner - this object's owner (Active Object or Experiment)

packagePrefix - the package name of original active object where this image is defined, formatted using '/' characters; with '/' character at the beginning and at the end

mode - possible values:

• READ
• WRITE
• WRITE_APPEND

fileName -

• absolute path to the file
• path to file relative to current working directory
• 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

charsetName - The name of a supported charset
Available charset names can be obtained calling Charset.availableCharsets().keySet()
use null for the default system charset

separatorsForReading - an array (may be null) of characters which should be assumed as token-separators. To define line-separator, use '\n' character. It is also important whether this array includes line-separator ('\n') or not. If doesn't then e.g. readString() may return string with multiple lines

For example, read tab-separated file can be processed using separatorsForReading = new char[]{ '\n', '\t' }

TextFile

public TextFile(Presentable owner,
                java.lang.String packagePrefix,
                java.net.URL url,
                java.lang.String charsetName,
                char[] separatorsForReading)

Creates new TextFile object in READ mode, based on given URL

Parameters:

owner - this object's owner (Active Object or Experiment)

packagePrefix - the package name of original active object where this image is defined, formatted using '/' characters; with '/' character at the beginning and at the end

url - the url to contents which should be read

charsetName - The name of a supported charset
Available charset names can be obtained calling Charset.availableCharsets().keySet()
use null for the default system charset

separatorsForReading - an array (may be null) of characters which should be assumed as token-separators. To define line-separator, use '\n' character. It is also important whether this array includes line-separator ('\n') or not. If doesn't then e.g. readString() may return string with multiple lines

For example, read tab-separated file can be processed using separatorsForReading = new char[]{ '\n', '\t' }

Method Detail

restoreOwner

public void restoreOwner(java.lang.Object owner)

This method normally should not be called by user
This method restores owner of this object
The method is used in snapshot saving/loading

Specified by:

restoreOwner in interface com.xj.anylogic.engine.internal.Child

Parameters:

owner - owner of this object, usually ActiveObject, Experiment or ShapeGroup

close

public 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
Closing a previously closed TextFile has no effect.

setFile

public void setFile(java.lang.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

Parameters:

fileName -

• absolute path to the file
• path to file relative to current working directory
• 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

mode - possible values:

• READ
• WRITE
• WRITE_APPEND

setURL

public void setURL(java.net.URL url)

Sets the new url to be used with this TextFile object
This method 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

Parameters:

url - the url to contents which should be read

setMode

public 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

Parameters:

mode - possible values:

• READ
• WRITE
• WRITE_APPEND

print

public void print(boolean b)

Prints a boolean value. The string produced by String.valueOf(boolean) is translated into bytes according to the chosen character encoding, and these bytes are written to the file.

Parameters:

b - The boolean to be printed

print

public void print(char c)

Prints a character. The character is translated into one or more bytes according to the chosen character encoding, and these bytes are written to the file.

Parameters:

c - The char to be printed

print

public void print(char[] s)

Prints an array of characters. The characters are converted into bytes according to the chosen character encoding, and these bytes are written to the file.

Parameters:

s - The array of chars to be printed

Throws:

java.lang.NullPointerException - If s is null

print

public void print(double d)

Prints a double-precision floating-point number. The string produced by String.valueOf(double) is translated into bytes according to the chosen character encoding, and these bytes are written to the file.

Parameters:

d - The double to be printed

See Also:

Double.toString(double)

print

public void print(float f)

Prints a floating-point number. The string produced by String.valueOf(float) is translated into bytes according to the chosen character encoding, and these bytes are written to the file.

Parameters:

f - The float to be printed

See Also:

Float.toString(float)

print

public void print(int i)

Prints an integer. The string produced by String.valueOf(int) is translated into bytes according to the chosen character encoding, and these bytes are written to the file.

Parameters:

i - The int to be printed

See Also:

Integer.toString(int)

print

public void print(long l)

Prints a long integer. The string produced by String.valueOf(long) is translated into bytes according to the chosen character encoding, and these bytes are written to the file.

Parameters:

l - The long to be printed

See Also:

Long.toString(long)

print

public void print(java.lang.Object obj)

Prints an object. The string produced by the String.valueOf(Object) method is translated into bytes according to the chosen character encoding, and these bytes are written to the file.

Parameters:

obj - The Object to be printed

See Also:

Object.toString()

print

public void print(java.lang.String s)

Prints a string. If the argument is null then the string "null" is printed. Otherwise, the string's characters are converted into bytes according to the chosen character encoding, and these bytes are written to the file.

Parameters:

s - The String to be printed

println

public 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').

println

public void println(boolean x)

Prints a boolean value and then terminates the line. This method behaves as though it invokes print(boolean) and then println().

Parameters:

x - the boolean value to be printed

println

public void println(char x)

Prints a character and then terminates the line. This method behaves as though it invokes print(char) and then println().

Parameters:

x - the char value to be printed

println

public void println(char[] x)

Prints an array of characters and then terminates the line. This method behaves as though it invokes print(char[]) and then println().

Parameters:

x - the array of char values to be printed

println

public void println(double x)

Prints a double-precision floating-point number and then terminates the line. This method behaves as though it invokes print(double) and then println().

Parameters:

x - the double value to be printed

println

public void println(float x)

Prints a floating-point number and then terminates the line. This method behaves as though it invokes print(float) and then println().

Parameters:

x - the float value to be printed

println

public void println(int x)

Prints an integer and then terminates the line. This method behaves as though it invokes print(int) and then println().

Parameters:

x - the int value to be printed

println

public void println(long x)

Prints a long integer and then terminates the line. This method behaves as though it invokes print(long) and then println().

Parameters:

x - the long value to be printed

println

public void println(java.lang.Object x)

Prints an Object and then terminates the line. This method calls at first String.valueOf(x) to get the printed object's string value, then behaves as though it invokes print(String) and then println().

Parameters:

x - The Object to be printed.

println

public void println(java.lang.String x)

Prints a String and then terminates the line. This method behaves as though it invokes print(String) and then println().

Parameters:

x - the String value to be printed

printf

public void printf(java.util.Locale l,
                   java.lang.String format,
                   java.lang.Object... args)

A convenient method to write a formatted string to the text file using the specified format string and arguments.

Parameters:

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. If there are more arguments than format specifiers, the extra arguments are ignored. The number of arguments is variable and may be zero. The maximum number of arguments is limited by the maximum dimension of a Java array as defined by the Java Virtual Machine Specification. The behavior on a null argument depends on the conversion of Formatter.

Throws:

java.util.IllegalFormatException - If a format string contains an illegal syntax, a format specifier that is incompatible with the given arguments, insufficient arguments given the format string, or other illegal conditions. For specification of all possible formatting errors, see the Details section of the Formatter class specification.

java.lang.NullPointerException - If the format is null

printf

public void printf(java.lang.String format,
                   java.lang.Object... args)

A convenient method to write a formatted string to the text file using the specified format string and arguments.

Parameters:

format - A format string as described in Formatter class specification.

args - Arguments referenced by the format specifiers in the format string. If there are more arguments than format specifiers, the extra arguments are ignored. The number of arguments is variable and may be zero. The maximum number of arguments is limited by the maximum dimension of a Java array as defined by the Java Virtual Machine Specification. The behavior on a null argument depends on the conversion of Formatter.

Throws:

java.util.IllegalFormatException - If a format string contains an illegal syntax, a format specifier that is incompatible with the given arguments, insufficient arguments given the format string, or other illegal conditions. For specification of all possible formatting errors, see the Details section of the Formatter class specification.

java.lang.NullPointerException - If the format is null

getLineNumber

public int getLineNumber()

Get the current line number.
This method is only available in READ mode

Returns:

• the current line number (1-based)
• 0 if the file hasn't been opened yet (no read- and skip-methods haven't been called as well as canReadMore())
• -1 if the end of the file has been reached

canReadMore

public boolean canReadMore()

Returns true if there is available content in the file at the reading position.
This method opens file for reading if it is not open.
This method is only available in READ mode

Returns:

true if there is available content in the file at the reading position, false if the end of file has been reached

readLine

public java.lang.String readLine()

Read 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 ';')

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

readBoolean

public boolean readBoolean()

Reads boolean string "true" or "false" (with or without quotation marks)

Returns:

the boolean value read.

readByte

public byte readByte()

Reads and returns number as byte. Byte value is a number in the range Byte.MIN_VALUE ... Byte.MAX_VALUE, inclusive.

Returns:

the byte number value read.

readShort

public short readShort()

Reads and returns a short value.
Short value is a number in the range Short.MIN_VALUE ... Short.MAX_VALUE, inclusive

Returns:

the short value read.

readChar

public 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

Returns:

the char value of character read.

readInt

public int readInt()

Reads and returns an int value.
Int value is a number in the range Integer.MIN_VALUE ... Integer.MAX_VALUE, inclusive

Returns:

the int value read.

readLong

public long readLong()

Reads and returns a long value.
Long value is a number in the range Long.MIN_VALUE ... Long.MAX_VALUE, inclusive

Returns:

the long value read.

readFloat

public float readFloat()

Reads and returns a float value (number with floating-point).

Returns:

the float value read.

readDouble

public double readDouble()

Reads and returns a double value (number with floating-point and double-precision).

Returns:

the double value read.

readString

public java.lang.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

Returns:

the double value read.

skipChars

public long skipChars(long n)

Skip characters (as well as separator characters).

Parameters:

n - the number of characters to skip

Returns:

the number of characters actually skipped

Throws:

java.lang.IllegalArgumentException - If n is negative

skipTokens

public int skipTokens(int n)

Skips tokens (texts between separators declared in the constructor)

Parameters:

n - the number of tokens to skip

Returns:

the number of tokens actually skipped

Throws:

java.lang.IllegalArgumentException - If n is negative

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object