111 lines
2.2 KiB
Java
111 lines
2.2 KiB
Java
/* Copyright (C) 1998, 1999 Cygnus Solutions
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package java.io;
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import java.util.Enumeration;
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/**
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* @author Warren Levy <warrenl@cygnus.com>
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* @date November 3, 1998.
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*/
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/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
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* "The Java Language Specification", ISBN 0-201-63451-1
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* plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
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* Status: Believed complete and correct.
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*/
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public class SequenceInputStream extends InputStream
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{
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/* The handle for the current input stream. */
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private InputStream in;
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/* Secondary input stream; not used if constructed w/ enumeration. */
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private InputStream in2;
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/* The enum handle; not used if constructed w/ 2 explicit input streams. */
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private Enumeration enum;
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public SequenceInputStream(Enumeration e)
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{
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enum = e;
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in = (InputStream) enum.nextElement();
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in2 = null;
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}
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public SequenceInputStream(InputStream s1, InputStream s2)
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{
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in = s1;
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in2 = s2;
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}
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public int available() throws IOException
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{
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if (in == null)
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return 0;
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return in.available();
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}
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public void close() throws IOException
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{
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while (in != null)
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{
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in.close();
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in = getNextStream ();
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}
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}
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public int read() throws IOException
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{
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int ch = -1;
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while (in != null && (ch = in.read()) < 0)
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{
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in.close();
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in = getNextStream();
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}
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return ch;
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}
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public int read(byte[] b, int off, int len) throws IOException
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{
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int ch = -1;
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// The validity of the parameters will be checked by in.read so
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// don't bother doing it here.
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while (in != null && (ch = in.read(b, off, len)) < 0)
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{
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in.close();
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in = getNextStream();
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}
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return ch;
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}
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private InputStream getNextStream()
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{
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InputStream nextIn = null;
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if (enum != null)
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{
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if (enum.hasMoreElements())
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nextIn = (InputStream) enum.nextElement();
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}
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else
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if (in2 != null)
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{
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nextIn = in2;
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in2 = null;
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}
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return nextIn;
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}
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}
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