- java.lang.Object
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- java.io.InputStream
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- java.io.SequenceInputStream
 
 
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- All Implemented Interfaces:
- Closeable,- AutoCloseable
 
 public class SequenceInputStream extends InputStream ASequenceInputStreamrepresents 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.- Since:
- 1.0
 
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Constructor SummaryConstructors Constructor Description SequenceInputStream(InputStream s1, InputStream s2)Initializes a newly createdSequenceInputStreamby remembering the two arguments, which will be read in order, firsts1and thens2, to provide the bytes to be read from thisSequenceInputStream.SequenceInputStream(Enumeration<? extends InputStream> e)Initializes a newly createdSequenceInputStreamby remembering the argument, which must be anEnumerationthat produces objects whose run-time type isInputStream.
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Method SummaryAll Methods Instance Methods Concrete Methods Modifier and Type Method Description intavailable()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.voidclose()Closes this input stream and releases any system resources associated with the stream.intread()Reads the next byte of data from this input stream.intread(byte[] b, int off, int len)Reads up tolenbytes of data from this input stream into an array of bytes.- 
Methods declared in class java.io.InputStreammark, markSupported, nullInputStream, read, readAllBytes, readNBytes, readNBytes, reset, skip, transferTo
 
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Constructor Detail- 
SequenceInputStreampublic SequenceInputStream(Enumeration<? extends InputStream> e) Initializes a newly createdSequenceInputStreamby remembering the argument, which must be anEnumerationthat produces objects whose run-time type isInputStream. The input streams that are produced by the enumeration will be read, in order, to provide the bytes to be read from thisSequenceInputStream. After each input stream from the enumeration is exhausted, it is closed by calling itsclosemethod.- Parameters:
- e- an enumeration of input streams.
- See Also:
- Enumeration
 
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SequenceInputStreampublic SequenceInputStream(InputStream s1, InputStream s2) Initializes a newly createdSequenceInputStreamby remembering the two arguments, which will be read in order, firsts1and thens2, to provide the bytes to be read from thisSequenceInputStream.- Parameters:
- s1- the first input stream to read.
- s2- the second input stream to read.
 
 
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Method Detail- 
availablepublic int available() throws IOExceptionReturns 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 availableof the current underlying input stream and returns the result.- Overrides:
- availablein class- InputStream
- Returns:
- an estimate of the number of bytes that can be read (or
         skipped over) from the current underlying input stream
         without blocking or 0if this input stream has been closed by invoking itsclose()method
- Throws:
- IOException- if an I/O error occurs.
- Since:
- 1.1
 
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readpublic int read() throws IOExceptionReads the next byte of data from this input stream. The byte is returned as anintin the range0to255. If no byte is available because the end of the stream has been reached, the value-1is 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 closemethod of the current substream and begins reading from the next substream.- Specified by:
- readin class- InputStream
- Returns:
- the next byte of data, or -1if the end of the stream is reached.
- Throws:
- IOException- if an I/O error occurs.
 
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readpublic int read(byte[] b, int off, int len) throws IOExceptionReads up tolenbytes of data from this input stream into an array of bytes. Iflenis not zero, the method blocks until at least 1 byte of input is available; otherwise, no bytes are read and0is returned.The readmethod ofSequenceInputStreamtries 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 theclosemethod of the current substream and begins reading from the next substream.- Overrides:
- readin class- InputStream
- Parameters:
- b- the buffer into which the data is read.
- off- the start offset in array- bat which the data is written.
- len- the maximum number of bytes read.
- Returns:
- int the number of bytes read.
- Throws:
- NullPointerException- If- bis- null.
- IndexOutOfBoundsException- If- offis negative,- lenis negative, or- lenis greater than- b.length - off
- IOException- if an I/O error occurs.
- See Also:
- InputStream.read()
 
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closepublic void close() throws IOExceptionCloses this input stream and releases any system resources associated with the stream. A closedSequenceInputStreamcannot 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 closemethod returns.- Specified by:
- closein interface- AutoCloseable
- Specified by:
- closein interface- Closeable
- Overrides:
- closein class- InputStream
- Throws:
- IOException- if an I/O error occurs.
 
 
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