Home » openjdk-7 » java » io » [javadoc | source]
java.io
public class: SequenceInputStream [javadoc | source]
java.lang.Object
   java.io.InputStream
      java.io.SequenceInputStream

All Implemented Interfaces:
    Closeable

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.
Field Summary
 Enumeration e     
 InputStream in     
Constructor:
 public SequenceInputStream(Enumeration<InputStream> e) 
    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.
 public SequenceInputStream(InputStream s1,
    InputStream s2) 
    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.
    Parameters:
    s1 - the first input stream to read.
    s2 - the second input stream to read.
Method from java.io.SequenceInputStream Summary:
available,   close,   nextStream,   read,   read
Methods from java.io.InputStream:
available,   close,   mark,   markSupported,   read,   read,   read,   reset,   skip
Methods from java.lang.Object:
clone,   equals,   finalize,   getClass,   hashCode,   notify,   notifyAll,   toString,   wait,   wait,   wait
Method from java.io.SequenceInputStream Detail:
 public int available() throws IOException 
    Returns an estimate of the number of bytes that can be read (or skipped over) from the current underlying input stream without blocking by the next invocation of a method for the current underlying input stream. The next invocation might be the same thread or another thread. A single read or skip of this many bytes will not block, but may read or skip fewer bytes.

    This method simply calls {@code available} of the current underlying input stream and returns the result.

 public  void close() throws IOException 
    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.

 final  void nextStream() throws IOException 
    Continues reading in the next stream if an EOF is reached.
 public int read() throws IOException 
    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.

 public int read(byte[] b,
    int off,
    int len) throws IOException 
    Reads up to len bytes of data from this input stream into an array of bytes. If len is not zero, the method blocks until at least 1 byte of input is available; otherwise, no bytes are read and 0 is returned.

    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.