skyview.request

Class TextReplacer

java.lang.Object

java.io.Reader

skyview.request.TextReplacer

All Implemented Interfaces:

Closeable, AutoCloseable, Readable

public class TextReplacer
extends Reader

This class provides a utility function that transforms strings to replace embedded settings with the current values of the setting.

Field Summary

Fields inherited from class java.io.Reader

lock

Constructor Summary

Constructors

Constructor and Description
TextReplacer(Map<String,String> fields, Reader input) Create an object where we'll filter an input stream replacing variables with values.

Method Summary

Modifier and Type	Method and Description
void	close()
static void	main(String[] args) Usage: TextReplacer filename key=val [key=val] ...
int	read()
int	read(char[] buf)
int	read(char[] buf, int offset, int len)
String	readLine()
boolean	ready()
String	replace(String input) Replace all settings variables with their values.
long	skip(long val)

Methods inherited from class java.io.Reader

mark, markSupported, read, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

TextReplacer

public TextReplacer(Map<String,String> fields,
                    Reader input)
             throws IOException

Create an object where we'll filter an input stream replacing variables with values.

Parameters:

fields - The map from variable keys to output values.

input - The input Reader to be filtered.

Throws:

IOException

Method Detail

readLine

public String readLine()
                throws IOException

Throws:

IOException

ready

public boolean ready()
              throws IOException

Overrides:

ready in class Reader

Throws:

IOException

read

public int read()
         throws IOException

Overrides:

read in class Reader

Throws:

IOException

skip

public long skip(long val)
          throws IOException

Overrides:

skip in class Reader

Throws:

IOException

read

public int read(char[] buf)
         throws IOException

Overrides:

read in class Reader

Throws:

IOException

read

public int read(char[] buf,
                int offset,
                int len)
         throws IOException

Specified by:

read in class Reader

Throws:

IOException

replace

public String replace(String input)

Replace all settings variables with their values. This function takes the current line and looks for all variables that are embedded in the string and replaces those variables with their value. E.g., given a string "The survey is ${survey} and the scale is ${scale}." the method will replace the string ${survey} with the specified value of survey and ${scale} with the specified value of scale. If an unmatched variable is found, the entire line is returned as a "". This allows one to control which lines are returned by the presence or absence of variables.

main

public static void main(String[] args)
                 throws Exception

Usage: TextReplacer filename key=val [key=val] ...

Throws:

Exception

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in class Reader

Throws:

IOException