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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.io;
import java.io.*;
/**
* This DataEntryWriter delegates to a given DataEntryWriter, or failing that,
* to another given DataEntryWriter.
*
* @author Eric Lafortune
*/
public class CascadingDataEntryWriter implements DataEntryWriter
{
private DataEntryWriter dataEntryWriter1;
private DataEntryWriter dataEntryWriter2;
/**
* Creates a new CascadingDataEntryWriter.
* @param dataEntryWriter1 the DataEntryWriter to which the writing will be
* delegated first.
* @param dataEntryWriter2 the DataEntryWriter to which the writing will be
* delegated, if the first one can't provide an
* output stream.
*/
public CascadingDataEntryWriter(DataEntryWriter dataEntryWriter1,
DataEntryWriter dataEntryWriter2)
{
this.dataEntryWriter1 = dataEntryWriter1;
this.dataEntryWriter2 = dataEntryWriter2;
}
// Implementations for DataEntryWriter.
public boolean createDirectory(DataEntry dataEntry) throws IOException
{
// Try to create a directory with the first data entry writer, or
// otherwise with the second data entry writer.
return dataEntryWriter1.createDirectory(dataEntry) ||
dataEntryWriter2.createDirectory(dataEntry);
}
public OutputStream getOutputStream(DataEntry dataEntry) throws IOException
{
return getOutputStream(dataEntry, null);
}
public OutputStream getOutputStream(DataEntry dataEntry,
Finisher finisher) throws IOException
{
// Try to get an output stream from the first data entry writer.
OutputStream outputStream =
dataEntryWriter1.getOutputStream(dataEntry, finisher);
// Return it, if it's not null. Otherwise try to get an output stream
// from the second data entry writer.
return outputStream != null ?
outputStream :
dataEntryWriter2.getOutputStream(dataEntry, finisher);
}
public void close() throws IOException
{
dataEntryWriter1.close();
dataEntryWriter2.close();
dataEntryWriter1 = null;
dataEntryWriter2 = null;
}
}
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