Modify the output of a PrintStream before print
Hi,
This is quite complicated and I have little to no clue how it can be done. Basically I am using a 3rd party class (which I do not have the source of) which has a method that as a parameter takes the PrintStream it is to use to display the output on the screen. Now I want to actually know what is going to be outputted before it is displayed on the screen so that I can change some special characters. Following I did a very simple example of how this works:import java.io.PrintStream;
publicclass Test8{
public Test8(){
// 1.
v(System.out);
}
privatevoid v(PrintStream out){
// Uses PrintStream to display 'Hi <name>'
out.println("Hi {0}");
}
publicstaticvoid main(String[] args){
new Test8();
}
}
In the code example above you can see that the methods named v will use the PrintStream object I passed as a parameter to display Hi {0}. However I want to capture that output so that I can replace that {0} with a parameter; example name.
What I thought of is actually passing a PrintStream that rather then outputs on the screen it outputs in some Buffer or String, so that I can then get that String, replace the elements I want and then print it normally. The psuedo code would be something like this:import java.io.PrintStream;
publicclass Test8{
public Test8(){
// 1.
v(myStreamObject);
// make my modifications
System.out.print(myNewString);
}
privatevoid v(PrintStream out){
// Uses PrintStream to display 'Hi <name>'
out.println("Hi {0}");
}
publicstaticvoid main(String[] args){
new Test8();
}
}
However I checked the APIs and so far still did not find anything!
Does anyone here have any idea on what I can do to manage this? I know my solution could be wrong. But unfortunately I have no other idea how this can be done.
Thanks for any suggestions,
Regards,
Sim085
ps: for the second code example I thought of extending the PrintStream object (trying to do that now) but not sure if I can do that.
