/* $Id: FilteredDataEntryReader.java,v 1.3.2.1 2006/01/16 22:57:55 eric Exp $ * * ProGuard -- shrinking, optimization, and obfuscation of Java class files. * * Copyright (c) 2002-2006 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 DataEntryReader delegates to one of two other DataEntryReader instances, * depending on whether the data entry passes through a given data entry filter * or not. * * @author Eric Lafortune */public class FilteredDataEntryReader implements DataEntryReader{    private DataEntryFilter dataEntryFilter;    private DataEntryReader acceptedDataEntryReader;    private DataEntryReader rejectedDataEntryReader;    /**     * Creates a new FilteredDataEntryReader with only a reader for accepted     * data entries.     * @param dataEntryFilter         the data entry filter.     * @param acceptedDataEntryReader the DataEntryReader to which the reading     *                                will be delegated if the filter accepts     *                                the data entry. May be <code>null</code>.     */    public FilteredDataEntryReader(DataEntryFilter dataEntryFilter,                                   DataEntryReader acceptedDataEntryReader)    {        this(dataEntryFilter, acceptedDataEntryReader, null);    }    /**     * Creates a new FilteredDataEntryReader.     * @param dataEntryFilter         the data entry filter.     * @param acceptedDataEntryReader the DataEntryReader to which the reading     *                                will be delegated if the filter accepts     *                                the data entry. May be <code>null</code>.     * @param rejectedDataEntryReader the DataEntryReader to which the reading     *                                will be delegated if the filter does not     *                                accept the data entry. May be     *                                <code>null</code>.     */    public FilteredDataEntryReader(DataEntryFilter dataEntryFilter,                                   DataEntryReader acceptedDataEntryReader,                                   DataEntryReader rejectedDataEntryReader)    {        this.dataEntryFilter         = dataEntryFilter;        this.acceptedDataEntryReader = acceptedDataEntryReader;        this.rejectedDataEntryReader = rejectedDataEntryReader;    }    // Implementations for DataEntryReader.    public void read(DataEntry dataEntry)    throws IOException    {        if (dataEntryFilter.accepts(dataEntry))        {            if (acceptedDataEntryReader != null)            {                acceptedDataEntryReader.read(dataEntry);            }        }        else        {            if (rejectedDataEntryReader != null)            {                rejectedDataEntryReader.read(dataEntry);            }        }    }}