| /* |
| * ProGuard -- shrinking, optimization, obfuscation, and preverification |
| * of Java bytecode. |
| * |
| * Copyright (c) 2002-2017 Eric Lafortune @ GuardSquare |
| * |
| * 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.IOException; |
| |
| |
| /** |
| * 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 final DataEntryFilter dataEntryFilter; |
| private final DataEntryReader acceptedDataEntryReader; |
| private final 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 |
| { |
| DataEntryReader dataEntryReader = dataEntryFilter.accepts(dataEntry) ? |
| acceptedDataEntryReader : |
| rejectedDataEntryReader; |
| |
| if (dataEntryReader != null) |
| { |
| dataEntryReader.read(dataEntry); |
| } |
| } |
| } |