1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.functor.generator;
18
19 import org.apache.commons.functor.UnaryFunction;
20 import org.apache.commons.functor.UnaryProcedure;
21
22 /**
23 * Generator that transforms the elements of another Generator.
24 *
25 * @version $Revision: 1156799 $ $Date: 2011-08-11 22:11:54 +0200 (Thu, 11 Aug 2011) $
26 */
27 public class TransformedGenerator<I, E> extends BaseGenerator<E> {
28 private final UnaryFunction<? super I, ? extends E> func;
29
30 /**
31 * Create a new TransformedGenerator.
32 * @param wrapped Generator to transform
33 * @param func UnaryFunction to apply to each element
34 */
35 public TransformedGenerator(Generator<? extends I> wrapped, UnaryFunction<? super I, ? extends E> func) {
36 super(wrapped);
37 if (wrapped == null) {
38 throw new IllegalArgumentException("Generator argument was null");
39 }
40 if (func == null) {
41 throw new IllegalArgumentException("UnaryFunction argument was null");
42 }
43 this.func = func;
44 }
45
46 /**
47 * {@inheritDoc}
48 */
49 public void run(final UnaryProcedure<? super E> proc) {
50 getWrappedGenerator().run(new UnaryProcedure<I>() {
51 public void run(I obj) {
52 proc.run(func.evaluate(obj));
53 }
54 });
55 }
56
57 /**
58 * {@inheritDoc}
59 */
60 @SuppressWarnings("unchecked")
61 @Override
62 protected Generator<? extends I> getWrappedGenerator() {
63 return (Generator<? extends I>) super.getWrappedGenerator();
64 }
65
66 /**
67 * {@inheritDoc}
68 */
69 public boolean equals(Object obj) {
70 if (obj == this) {
71 return true;
72 }
73 if (!(obj instanceof TransformedGenerator<?, ?>)) {
74 return false;
75 }
76 TransformedGenerator<?, ?> other = (TransformedGenerator<?, ?>) obj;
77 return other.getWrappedGenerator().equals(getWrappedGenerator()) && other.func == func;
78 }
79
80 /**
81 * {@inheritDoc}
82 */
83 public int hashCode() {
84 int result = "TransformedGenerator".hashCode();
85 result <<= 2;
86 result ^= getWrappedGenerator().hashCode();
87 result <<= 2;
88 result ^= func.hashCode();
89 return result;
90 }
91 }