/*
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* ProGuard -- shrinking, optimization, obfuscation, and preverification
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* of Java bytecode.
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*
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* Copyright (c) 2002-2014 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 final 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 boolean createDirectory(DataEntry dataEntry) 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.createDirectory(dataEntry);
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}
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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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}
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