java.io.SequenceInputStream Maven / Gradle / Ivy
/*
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documentation, such as a unified set of documents of API signatures for
a platform that includes technologies expressed as Java APIs. The file
may also be used to produce "compilation stubs," which allow
applications to be compiled and validated for such platforms.
Any work generated from this file, such as unified javadocs or compiled
stub files, must be accompanied by this notice in its entirety.
This work corresponds to the API signatures of JSR 219: Foundation
Profile 1.1. In the event of a discrepency between this work and the
JSR 219 specification, which is available at
http://www.jcp.org/en/jsr/detail?id=219, the latter takes precedence.
*/
package java.io;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Vector;
/**
* A SequenceInputStream represents
* the logical concatenation of other input
* streams. It starts out with an ordered
* collection of input streams and reads from
* the first one until end of file is reached,
* whereupon it reads from the second one,
* and so on, until end of file is reached
* on the last of the contained input streams.
*
* @author Author van Hoff
* @version 1.23, 02/02/00
* @since JDK1.0
*/
public class SequenceInputStream extends java.io.InputStream
{
/**
* Initializes a newly created SequenceInputStream
* by remembering the argument, which must
* be an Enumeration that produces
* objects whose run-time type is InputStream.
* The input streams that are produced by
* the enumeration will be read, in order,
* to provide the bytes to be read from this
* SequenceInputStream. After
* each input stream from the enumeration
* is exhausted, it is closed by calling its
* close method.
*
* @param e an enumeration of input streams.
* @see java.util.Enumeration
*/
public SequenceInputStream(Enumeration e) { }
/**
* Initializes a newly
* created SequenceInputStream
* by remembering the two arguments, which
* will be read in order, first s1
* and then s2, to provide the
* bytes to be read from this SequenceInputStream.
*
* @param s1 the first input stream to read.
* @param s2 the second input stream to read.
*/
public SequenceInputStream(java.io.InputStream s1, java.io.InputStream s2)
{ }
/**
* Returns the number of bytes available on the current stream.
*
* @since JDK1.1
*/
public int available() throws IOException {
return 0;
}
/**
* Reads the next byte of data from this input stream. The byte is
* returned as an int in the range 0 to
* 255. If no byte is available because the end of the
* stream has been reached, the value -1 is returned.
* This method blocks until input data is available, the end of the
* stream is detected, or an exception is thrown.
*
* This method
* tries to read one character from the current substream. If it
* reaches the end of the stream, it calls the close
* method of the current substream and begins reading from the next
* substream.
*
* @return the next byte of data, or -1 if the end of the
* stream is reached.
* @exception IOException if an I/O error occurs.
*/
public int read() throws IOException {
return 0;
}
/**
* Reads up to len bytes of data from this input stream
* into an array of bytes. This method blocks until at least 1 byte
* of input is available. If the first argument is null,
* up to len bytes are read and discarded.
*
* The read method of SequenceInputStream
* tries to read the data from the current substream. If it fails to
* read any characters because the substream has reached the end of
* the stream, it calls the close method of the current
* substream and begins reading from the next substream.
*
* @param b the buffer into which the data is read.
* @param off the start offset of the data.
* @param len the maximum number of bytes read.
* @return int the number of bytes read.
* @exception IOException if an I/O error occurs.
*/
public int read(byte[] b, int off, int len) throws IOException {
return 0;
}
/**
* Closes this input stream and releases any system resources
* associated with the stream.
* A closed SequenceInputStream
* cannot perform input operations and cannot
* be reopened.
*
* If this stream was created
* from an enumeration, all remaining elements
* are requested from the enumeration and closed
* before the close method returns.
* of InputStream .
*
* @exception IOException if an I/O error occurs.
*/
public void close() throws IOException { }
}