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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 one of two other DataEntryWriter instances,
* depending on whether the data entry passes through a given data entry filter
* or not.
*
* @author Eric Lafortune
*/
public class FilteredDataEntryWriter implements DataEntryWriter
{
private final DataEntryFilter dataEntryFilter;
private DataEntryWriter acceptedDataEntryWriter;
private DataEntryWriter rejectedDataEntryWriter;
/**
* Creates a new FilteredDataEntryWriter with only a writer for accepted
* data entries.
* @param dataEntryFilter the data entry filter.
* @param acceptedDataEntryWriter the DataEntryWriter to which the writing
* will be delegated if the filter accepts
* the data entry. May be <code>null</code>.
*/
public FilteredDataEntryWriter(DataEntryFilter dataEntryFilter,
DataEntryWriter acceptedDataEntryWriter)
{
this(dataEntryFilter, acceptedDataEntryWriter, null);
}
/**
* Creates a new FilteredDataEntryWriter.
* @param dataEntryFilter the data entry filter.
* @param acceptedDataEntryWriter the DataEntryWriter to which the writing
* will be delegated if the filter accepts
* the data entry. May be <code>null</code>.
* @param rejectedDataEntryWriter the DataEntryWriter to which the writing
* will be delegated if the filter does not
* accept the data entry. May be
* <code>null</code>.
*/
public FilteredDataEntryWriter(DataEntryFilter dataEntryFilter,
DataEntryWriter acceptedDataEntryWriter,
DataEntryWriter rejectedDataEntryWriter)
{
this.dataEntryFilter = dataEntryFilter;
this.acceptedDataEntryWriter = acceptedDataEntryWriter;
this.rejectedDataEntryWriter = rejectedDataEntryWriter;
}
// Implementations for DataEntryWriter.
public boolean createDirectory(DataEntry dataEntry) throws IOException
{
// Get the right data entry writer.
DataEntryWriter dataEntryWriter = dataEntryFilter.accepts(dataEntry) ?
acceptedDataEntryWriter :
rejectedDataEntryWriter;
// Delegate to it, if it's not null.
return dataEntryWriter != null &&
dataEntryWriter.createDirectory(dataEntry);
}
public OutputStream getOutputStream(DataEntry dataEntry) throws IOException
{
return getOutputStream(dataEntry, null);
}
public OutputStream getOutputStream(DataEntry dataEntry,
Finisher finisher) throws IOException
{
// Get the right data entry writer.
DataEntryWriter dataEntryWriter = dataEntryFilter.accepts(dataEntry) ?
acceptedDataEntryWriter :
rejectedDataEntryWriter;
// Delegate to it, if it's not null.
return dataEntryWriter != null ?
dataEntryWriter.getOutputStream(dataEntry, finisher) :
null;
}
public void close() throws IOException
{
if (acceptedDataEntryWriter != null)
{
acceptedDataEntryWriter.close();
acceptedDataEntryWriter = null;
}
if (rejectedDataEntryWriter != null)
{
rejectedDataEntryWriter.close();
rejectedDataEntryWriter = null;
}
}
}
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