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Java > Open Source Codes > com > google > inject > util > ToStringBuilder


1 /**
2  * Copyright (C) 2006 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16
17 package com.google.inject.util;
18
19 import java.util.Map JavaDoc;
20 import java.util.LinkedHashMap JavaDoc;
21
22 /**
23  * Helps with {@code toString()} methods.
24  *
25  * @author crazybob@google.com (Bob Lee)
26  */
27 public class ToStringBuilder {
28
29   // Linked hash map ensures ordering.
30 final Map JavaDoc<String JavaDoc, Object JavaDoc> map = new LinkedHashMap JavaDoc<String JavaDoc, Object JavaDoc>();
31
32   final String JavaDoc name;
33
34   public ToStringBuilder(String JavaDoc name) {
35     this.name = name;
36   }
37
38   public ToStringBuilder(Class JavaDoc type) {
39     this.name = type.getSimpleName();
40   }
41
42   public ToStringBuilder add(String JavaDoc name, Object JavaDoc value) {
43     if (map.put(name, value) != null) {
44       throw new RuntimeException JavaDoc("Duplicate names: " + name);
45     }
46     return this;
47   }
48
49   public String JavaDoc toString() {
50     return name + map.toString().replace('{', '[').replace('}', ']');
51   }
52 }
53
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