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Viewing changes to src/proguard/io/FilteredDataEntryWriter.java

  • Committer: Bazaar Package Importer
  • Author(s): Sam Clegg
  • Date: 2005-06-17 14:25:24 UTC
  • Revision ID: james.westby@ubuntu.com-20050617142524-thz2yfa3vemy3j9d
Tags: upstream-3.2
Import upstream version 3.2

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src/proguard/io/FilteredDataEntryWriter.java
 
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/* $Id: FilteredDataEntryWriter.java,v 1.2 2004/08/15 12:39:30 eric Exp $
 
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 *
 
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 * ProGuard -- shrinking, optimization, and obfuscation of Java class files.
 
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 *
 
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 * Copyright (c) 2002-2004 Eric Lafortune (eric@graphics.cornell.edu)
 
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 *
 
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 * This program is free software; you can redistribute it and/or modify it
 
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 * under the terms of the GNU General Public License as published by the Free
 
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 * Software Foundation; either version 2 of the License, or (at your option)
 
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 * any later version.
 
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 *
 
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 * This program is distributed in the hope that it will be useful, but WITHOUT
 
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 
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 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 
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 * more details.
 
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 *
 
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 * You should have received a copy of the GNU General Public License along
 
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 * with this program; if not, write to the Free Software Foundation, Inc.,
 
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 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 
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 */
 
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package proguard.io;
 
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import java.io.*;
 
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/**
 
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 * This DataEntryWriter delegates to one of two other DataEntryWriter instances,
 
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 * depending on whether the data entry passes through a given data entry filter
 
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 * or not.
 
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 *
 
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 * @author Eric Lafortune
 
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 */
 
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public class FilteredDataEntryWriter implements DataEntryWriter
 
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{
 
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    private DataEntryFilter dataEntryFilter;
 
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    private DataEntryWriter acceptedDataEntryWriter;
 
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    private DataEntryWriter rejectedDataEntryWriter;
 
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    /**
 
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     * Creates a new FilteredDataEntryWriter with only a writer for accepted
 
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     * data entries.
 
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     * @param dataEntryFilter         the data entry filter.
 
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     * @param acceptedDataEntryWriter the DataEntryWriter to which the writing
 
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     *                                will be delegated if the filter accepts
 
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     *                                the data entry. May be <code>null</code>.
 
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     */
 
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    public FilteredDataEntryWriter(DataEntryFilter dataEntryFilter,
 
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                                   DataEntryWriter acceptedDataEntryWriter)
 
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    {
 
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        this(dataEntryFilter, acceptedDataEntryWriter, null);
 
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    }
 
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    /**
 
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     * Creates a new FilteredDataEntryWriter.
 
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     * @param dataEntryFilter         the data entry filter.
 
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     * @param acceptedDataEntryWriter the DataEntryWriter to which the writing
 
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     *                                will be delegated if the filter accepts
 
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     *                                the data entry. May be <code>null</code>.
 
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     * @param rejectedDataEntryWriter the DataEntryWriter to which the writing
 
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     *                                will be delegated if the filter does not
 
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     *                                accept the data entry. May be
 
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     *                                <code>null</code>.
 
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     */
 
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    public FilteredDataEntryWriter(DataEntryFilter dataEntryFilter,
 
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                                   DataEntryWriter acceptedDataEntryWriter,
 
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                                   DataEntryWriter rejectedDataEntryWriter)
 
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    {
 
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        this.dataEntryFilter         = dataEntryFilter;
 
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        this.acceptedDataEntryWriter = acceptedDataEntryWriter;
 
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        this.rejectedDataEntryWriter = rejectedDataEntryWriter;
 
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    }
 
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    // Implementations for DataEntryWriter.
 
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    public OutputStream getOutputStream(DataEntry dataEntry) throws IOException
 
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    {
 
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        return getOutputStream(dataEntry,  null);
 
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    }
 
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    public OutputStream getOutputStream(DataEntry dataEntry,
 
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                                        Finisher  finisher) throws IOException
 
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    {
 
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        // Get the right data entry writer.
 
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        DataEntryWriter dataEntryWriter = dataEntryFilter.accepts(dataEntry) ?
 
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            acceptedDataEntryWriter :
 
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            rejectedDataEntryWriter;
 
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        // Delegate to it, if it's not null.
 
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        return dataEntryWriter != null ?
 
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            dataEntryWriter.getOutputStream(dataEntry, finisher) :
 
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            null;
 
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    }
 
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    public void close() throws IOException
 
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    {
 
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        if (acceptedDataEntryWriter != null)
 
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        {
 
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            acceptedDataEntryWriter.close();
 
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            acceptedDataEntryWriter = null;
 
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        }
 
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        if (rejectedDataEntryWriter != null)
 
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        {
 
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            rejectedDataEntryWriter.close();
 
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            rejectedDataEntryWriter = null;
 
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        }
 
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    }
 
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}