Package org.apache.commons.io.input

Class TeeInputStream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

org.apache.commons.io.input.ProxyInputStream

org.apache.commons.io.input.TeeInputStream

All Implemented Interfaces:

Closeable, AutoCloseable

public class TeeInputStream
extends ProxyInputStream

InputStream proxy that transparently writes a copy of all bytes read from the proxied stream to a given OutputStream. Using ProxyInputStream.skip(long) or ProxyInputStream.mark(int)/ProxyInputStream.reset() on the stream will result on some bytes from the input stream being skipped or duplicated in the output stream.

The proxied input stream is closed when the close() method is called on this proxy. You may configure whether the input stream closes the output stream.

Since:

1.4

See Also:

• ObservableInputStream

Field Summary

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Constructors

Constructor	Description
TeeInputStream(InputStream input, OutputStream branch)	Constructs a TeeInputStream that proxies the given InputStream and copies all read bytes to the given OutputStream.
TeeInputStream(InputStream input, OutputStream branch, boolean closeBranch)	Constructs a TeeInputStream that proxies the given InputStream and copies all read bytes to the given OutputStream.

Method Summary

Modifier and Type	Method	Description
void	close()	Closes the proxied input stream and, if so configured, the associated output stream.
int	read()	Reads a single byte from the proxied input stream and writes it to the associated output stream.
int	read(byte[] bts)	Reads bytes from the proxied input stream and writes the read bytes to the associated output stream.
int	read(byte[] bts, int st, int end)	Reads bytes from the proxied input stream and writes the read bytes to the associated output stream.

Methods inherited from class org.apache.commons.io.input.ProxyInputStream

afterRead, available, beforeRead, handleIOException, mark, markSupported, reset, skip, unwrap

Methods inherited from class java.lang.Object

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

Constructor Details

TeeInputStream

public TeeInputStream(InputStream input,
 OutputStream branch)

Constructs a TeeInputStream that proxies the given InputStream and copies all read bytes to the given OutputStream. The given output stream will not be closed when this stream gets closed.

Parameters:

input - input stream to be proxied

branch - output stream that will receive a copy of all bytes read

TeeInputStream

public TeeInputStream(InputStream input,
 OutputStream branch,
 boolean closeBranch)

Constructs a TeeInputStream that proxies the given InputStream and copies all read bytes to the given OutputStream. The given output stream will be closed when this stream gets closed if the closeBranch parameter is true.

Parameters:

input - input stream to be proxied

branch - output stream that will receive a copy of all bytes read

closeBranch - flag for closing also the output stream when this stream is closed

Method Details

close

public void close()
           throws IOException

Closes the proxied input stream and, if so configured, the associated output stream. An exception thrown from one stream will not prevent closing of the other stream.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class ProxyInputStream

Throws:

IOException - if either of the streams could not be closed

read

public int read()
         throws IOException

Reads a single byte from the proxied input stream and writes it to the associated output stream.

Overrides:

read in class ProxyInputStream

Returns:

next byte from the stream, or -1 if the stream has ended

Throws:

IOException - if the stream could not be read (or written)

read

public int read(byte[] bts)
         throws IOException

Reads bytes from the proxied input stream and writes the read bytes to the associated output stream.

Overrides:

read in class ProxyInputStream

Parameters:

bts - byte buffer

Returns:

number of bytes read, or -1 if the stream has ended

Throws:

IOException - if the stream could not be read (or written)

read

public int read(byte[] bts,
 int st,
 int end)
         throws IOException

Reads bytes from the proxied input stream and writes the read bytes to the associated output stream.

Overrides:

read in class ProxyInputStream

Parameters:

bts - byte buffer

st - start offset within the buffer

end - maximum number of bytes to read

Returns:

number of bytes read, or -1 if the stream has ended

Throws:

IOException - if the stream could not be read (or written)