org.apache.commons.io.input

This package provides implementations of input classes, such as InputStream and Reader.

This implementation provides a light weight object for testing with an InputStream where the contents don't matter.

One use case would be for testing the handling of large InputStream as it can emulate that scenario without the overhead of actually processing large numbers of bytes - significantly speeding up test execution times.

This implementation returns zero from the method that reads a byte and leaves the array unchanged in the read methods that are passed a byte array. If alternative data is required the processByte() and processBytes() methods can be implemented to generate data, for example:

 public class TestInputStream extends NullInputStream {
 public TestInputStream(int size) {
 super(size);
 }
 protected int processByte() {
 return ...

This implementation provides a light weight object for testing with an Reader where the contents don't matter.

One use case would be for testing the handling of large Reader as it can emulate that scenario without the overhead of actually processing large numbers of characters - significantly speeding up test execution times.

This implementation returns a space from the method that reads a character and leaves the array unchanged in the read methods that are passed a character array. If alternative data is required the processChar() and processChars() methods can be implemented to generate data, for example:

 public class TestReader extends NullReader {
 public TestReader(int size) {
 super(size);
 }
 protected char processChar() {
 return ...