/*
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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 a given DataEntryWriter, or failing that,
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* to another given DataEntryWriter.
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*
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* @author Eric Lafortune
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*/
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public class CascadingDataEntryWriter implements DataEntryWriter
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{
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private DataEntryWriter dataEntryWriter1;
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private DataEntryWriter dataEntryWriter2;
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/**
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* Creates a new CascadingDataEntryWriter.
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* @param dataEntryWriter1 the DataEntryWriter to which the writing will be
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* delegated first.
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* @param dataEntryWriter2 the DataEntryWriter to which the writing will be
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* delegated, if the first one can't provide an
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* output stream.
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*/
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public CascadingDataEntryWriter(DataEntryWriter dataEntryWriter1,
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DataEntryWriter dataEntryWriter2)
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{
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this.dataEntryWriter1 = dataEntryWriter1;
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this.dataEntryWriter2 = dataEntryWriter2;
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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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// Try to create a directory with the first data entry writer, or
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// otherwise with the second data entry writer.
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return dataEntryWriter1.createDirectory(dataEntry) ||
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dataEntryWriter2.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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// Try to get an output stream from the first data entry writer.
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OutputStream outputStream =
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dataEntryWriter1.getOutputStream(dataEntry, finisher);
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// Return it, if it's not null. Otherwise try to get an output stream
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// from the second data entry writer.
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return outputStream != null ?
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outputStream :
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dataEntryWriter2.getOutputStream(dataEntry, finisher);
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}
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public void close() throws IOException
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{
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dataEntryWriter1.close();
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dataEntryWriter2.close();
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dataEntryWriter1 = null;
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dataEntryWriter2 = null;
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}
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}
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