Package org.apache.commons.text.io

Class StringSubstitutorReader

java.lang.Object

java.io.Reader

java.io.FilterReader

org.apache.commons.text.io.StringSubstitutorReader

All Implemented Interfaces:

Closeable, AutoCloseable, Readable

public class StringSubstitutorReader
extends FilterReader

A Reader that performs string substitution on a source Reader using a StringSubstitutor.

Using this Reader avoids reading a whole file into memory as a String to perform string substitution, for example, when a Servlet filters a file to a client.

This class is not thread-safe.

Since:

1.9

Constructor Summary

Constructors

Constructor	Description
StringSubstitutorReader(Reader reader, StringSubstitutor stringSubstitutor)	Constructs a new instance.

Method Summary

Modifier and Type	Method	Description
int	read()	Reads a single character.
int	read(char[] target, int targetIndexIn, int targetLengthIn)	Reads characters into a portion of an array.

Methods inherited from class java.io.FilterReader

close, mark, markSupported, ready, reset, skip

Methods inherited from class java.io.Reader

nullReader, read, read, transferTo

Methods inherited from class java.lang.Object

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

Constructor Detail

StringSubstitutorReader

public StringSubstitutorReader(Reader reader,
                               StringSubstitutor stringSubstitutor)

Constructs a new instance.

Parameters:

reader - the underlying reader containing the template text known to the given StringSubstitutor.

stringSubstitutor - How to replace as we read.

Throws:

NullPointerException - if reader is null.

NullPointerException - if stringSubstitutor is null.

Method Detail

read

public int read()
         throws IOException

Reads a single character.

Overrides:

read in class FilterReader

Returns:

a character as an int or -1 for end-of-stream.

Throws:

IOException - If an I/O error occurs

read

public int read(char[] target,
                int targetIndexIn,
                int targetLengthIn)
         throws IOException

Reads characters into a portion of an array.

Overrides:

read in class FilterReader

Parameters:

target - Target buffer.

targetIndexIn - Index in the target at which to start storing characters.

targetLengthIn - Maximum number of characters to read.

Returns:

The number of characters read, or -1 on end of stream.

Throws:

IOException - If an I/O error occurs