1 /* 2 * ProGuard -- shrinking, optimization, obfuscation, and preverification 3 * of Java bytecode. 4 * 5 * Copyright (c) 2002-2014 Eric Lafortune (eric (at) graphics.cornell.edu) 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the Free 9 * Software Foundation; either version 2 of the License, or (at your option) 10 * any later version. 11 * 12 * This program is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 * more details. 16 * 17 * You should have received a copy of the GNU General Public License along 18 * with this program; if not, write to the Free Software Foundation, Inc., 19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 package proguard.io; 22 23 import java.io.IOException; 24 25 26 /** 27 * This DataEntryReader delegates to one of two other DataEntryReader instances, 28 * depending on whether the data entry passes through a given data entry filter 29 * or not. 30 * 31 * @author Eric Lafortune 32 */ 33 public class FilteredDataEntryReader implements DataEntryReader 34 { 35 private final DataEntryFilter dataEntryFilter; 36 private final DataEntryReader acceptedDataEntryReader; 37 private final DataEntryReader rejectedDataEntryReader; 38 39 40 /** 41 * Creates a new FilteredDataEntryReader with only a reader for accepted 42 * data entries. 43 * @param dataEntryFilter the data entry filter. 44 * @param acceptedDataEntryReader the DataEntryReader to which the reading 45 * will be delegated if the filter accepts 46 * the data entry. May be <code>null</code>. 47 */ 48 public FilteredDataEntryReader(DataEntryFilter dataEntryFilter, 49 DataEntryReader acceptedDataEntryReader) 50 { 51 this(dataEntryFilter, acceptedDataEntryReader, null); 52 } 53 54 55 /** 56 * Creates a new FilteredDataEntryReader. 57 * @param dataEntryFilter the data entry filter. 58 * @param acceptedDataEntryReader the DataEntryReader to which the reading 59 * will be delegated if the filter accepts 60 * the data entry. May be <code>null</code>. 61 * @param rejectedDataEntryReader the DataEntryReader to which the reading 62 * will be delegated if the filter does not 63 * accept the data entry. May be 64 * <code>null</code>. 65 */ 66 public FilteredDataEntryReader(DataEntryFilter dataEntryFilter, 67 DataEntryReader acceptedDataEntryReader, 68 DataEntryReader rejectedDataEntryReader) 69 { 70 this.dataEntryFilter = dataEntryFilter; 71 this.acceptedDataEntryReader = acceptedDataEntryReader; 72 this.rejectedDataEntryReader = rejectedDataEntryReader; 73 } 74 75 76 // Implementations for DataEntryReader. 77 78 public void read(DataEntry dataEntry) 79 throws IOException 80 { 81 DataEntryReader dataEntryReader = dataEntryFilter.accepts(dataEntry) ? 82 acceptedDataEntryReader : 83 rejectedDataEntryReader; 84 85 if (dataEntryReader != null) 86 { 87 dataEntryReader.read(dataEntry); 88 } 89 } 90 } 91
