001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.xbean.finder.archive; 018 019import org.apache.xbean.finder.filter.Filter; 020 021import java.io.IOException; 022import java.io.InputStream; 023import java.util.Iterator; 024import java.util.NoSuchElementException; 025 026/** 027 * @version $Rev$ $Date$ 028 */ 029public class FilteredArchive implements Archive { 030 031 private final Archive archive; 032 033 private final Filter filter; 034 035 public FilteredArchive(Archive archive, Filter filter) { 036 this.archive = archive; 037 this.filter = filter; 038 } 039 040 public InputStream getBytecode(String className) throws IOException, ClassNotFoundException { 041 return archive.getBytecode(className); 042 } 043 044 public Class<?> loadClass(String className) throws ClassNotFoundException { 045 return archive.loadClass(className); 046 } 047 048 public Iterator<Entry> iterator() { 049 return new FilteredIterator(archive.iterator()); 050 } 051 052 private final class FilteredIterator implements Iterator<Entry> { 053 private final Iterator<Entry> it; 054 055 private Entry next; 056 057 private FilteredIterator(Iterator<Entry> it) { 058 this.it = it; 059 } 060 061 public boolean hasNext() { 062 if (next != null) return true; 063 if (!it.hasNext()) return false; 064 seek(); 065 return hasNext(); 066 } 067 068 public Entry next() { 069 if (!hasNext()) throw new NoSuchElementException(); 070 071 Entry s = next; 072 next = null; 073 074 return s; 075 } 076 077 public void remove() { 078 it.remove(); 079 } 080 081 private void seek() { 082 while (next == null && it.hasNext()) { 083 084 next = it.next(); 085 086 if (filter.accept(next.getName())) return; 087 088 next = null; 089 } 090 } 091 092 } 093}