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/** |
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$Id$ |
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Copyright (C) 2010 Nicklas Nordborg |
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This file is part of BASE - BioArray Software Environment. |
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Available at http://base.thep.lu.se/ |
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BASE is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License |
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as published by the Free Software Foundation; either version 3 |
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of the License, or (at your option) any later version. |
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BASE is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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18 |
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You should have received a copy of the GNU General Public License |
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along with BASE. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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package net.sf.basedb.util; |
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import java.io.IOException; |
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import java.io.InputStream; |
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|
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/** |
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An input stream implementation that reads one or more input streams |
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sequentially. When the end of the first stream has been reached, reading |
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continues on the next one, and so on until all streams have been read. |
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The underlying streams are automatically closed once they have been fully |
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read. |
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@author Nicklas |
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@since 2.16 |
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@base.modified $Date$ |
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*/ |
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public class InputStreamCombiner |
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extends InputStream |
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{ |
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private final InputStream[] in; |
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private int index; |
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|
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/** |
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Create a new stream combiner using the given streams to read from |
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@param in The stream to read from, must be an array with at least |
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one stream |
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*/ |
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public InputStreamCombiner(InputStream... in) |
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{ |
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this.in = in; |
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if (in == null || in.length == 0) throw new NullPointerException("'in' is null or empty"); |
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this.index = 0; |
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} |
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|
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/* |
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From the InputStream class |
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-------------------------- |
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*/ |
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@Override |
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public int available() |
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throws IOException |
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{ |
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if (index >= in.length) return 0; |
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return in[index].available(); |
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} |
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|
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/** |
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Closes all underlying streams. |
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*/ |
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@Override |
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public void close() |
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throws IOException |
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{ |
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while (index < in.length) |
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{ |
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nextStream(); |
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} |
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} |
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|
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@Override |
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public int read(byte[] b, int off, int len) |
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throws IOException |
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{ |
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int result = -1; |
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while (result == -1 && index < in.length) |
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{ |
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result = in[index].read(b, off, len); |
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if (result == -1) nextStream(); |
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} |
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return result; |
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} |
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|
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@Override |
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public int read(byte[] b) |
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throws IOException |
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{ |
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return read(b, 0, b.length); |
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} |
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|
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@Override |
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public long skip(long n) |
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throws IOException |
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{ |
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if (index >= in.length) return 0; |
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long skipped = 0; |
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while (read() != -1 && skipped < n) |
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{ |
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++skipped; |
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} |
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return skipped; |
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} |
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|
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@Override |
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public int read() |
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throws IOException |
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{ |
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int result = -1; |
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while (result == -1 && index < in.length) |
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{ |
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result = in[index].read(); |
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if (result == -1) nextStream(); |
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} |
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return result; |
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} |
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// ------------------------------------- |
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|
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private void nextStream() |
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{ |
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FileUtil.close(in[index]); |
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++index; |
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} |
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|
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} |