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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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|
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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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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.InputStream; |
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import java.io.OutputStream; |
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|
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/** |
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Runnable implementation that copies data from an input stream |
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to an output stream when executed. This is useful when executing |
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external processes since reading and writing to their stdin and |
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stdout is best done with separate thread. |
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|
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@author nicklas |
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@since 2.15 |
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@base.modified $Date $ |
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*/ |
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public class FileCopyRunnable |
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implements Runnable |
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{ |
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|
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private final InputStream in; |
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private final OutputStream out; |
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private Throwable error; |
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|
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/** |
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Create a new file copy object. The stream are automatically closed |
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in case of an error |
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|
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@param in The input stream to read data from (required) |
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@param out The output stream to write data to (optional; if not |
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given the input stream is read and then discarded) |
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*/ |
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public FileCopyRunnable(InputStream in, OutputStream out) |
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{ |
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if (in == null) throw new NullPointerException("in"); |
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this.in = in; |
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this.out = out; |
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} |
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|
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@Override |
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public void run() |
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{ |
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try |
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{ |
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if (out == null) |
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{ |
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FileUtil.read(in); |
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} |
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else |
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{ |
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FileUtil.copy(in, out); |
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} |
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} |
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catch (Throwable t) |
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{ |
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error = t; |
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} |
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finally |
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{ |
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FileUtil.close(in); |
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FileUtil.close(out); |
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} |
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} |
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|
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/** |
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A boolean flag indicating if the copying was sucessful or not. |
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This method should only be called after the thread has ended. |
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@see #getError() |
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*/ |
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public boolean hasError() |
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{ |
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return error != null; |
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} |
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|
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/** |
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Get the exception that was thrown when executing the file copy |
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operation. This method should only be called after the thread |
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has ended. |
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@return An error or null if the operation was sucessful |
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@see #hasError() |
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*/ |
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public Throwable getError() |
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{ |
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return error; |
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} |
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|
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} |