1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.maven.internal.impl;
20
21 import java.util.AbstractCollection;
22 import java.util.Collection;
23 import java.util.Iterator;
24 import java.util.function.Function;
25
26 public class MappedCollection<U, V> extends AbstractCollection<U> {
27 private final Collection<V> list;
28 private final Function<V, U> mapper;
29
30 public MappedCollection(Collection<V> list, Function<V, U> mapper) {
31 this.list = list;
32 this.mapper = mapper;
33 }
34
35 @Override
36 public Iterator<U> iterator() {
37 Iterator<V> it = list.iterator();
38 return new Iterator<U>() {
39 @Override
40 public boolean hasNext() {
41 return it.hasNext();
42 }
43
44 @Override
45 public U next() {
46 return mapper.apply(it.next());
47 }
48 };
49 }
50
51 @Override
52 public int size() {
53 return list.size();
54 }
55 }