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Java > Open Source Codes > com > google > gwt > util > tools > ArgHandlerFlag


1 /*
2  * Copyright 2006 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5  * use this file except in compliance with the License. You may obtain a copy of
6  * 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, WITHOUT
12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13  * License for the specific language governing permissions and limitations under
14  * the License.
15  */
16 package com.google.gwt.util.tools;
17
18 import com.google.gwt.dev.util.Empty;
19
20 /**
21  * Argument handler for flags that have no parameters.
22  */
23 public abstract class ArgHandlerFlag extends ArgHandler {
24
25   public String JavaDoc[] getDefaultArgs() {
26     return null;
27   }
28
29   public abstract String JavaDoc getPurpose();
30
31   public abstract String JavaDoc getTag();
32
33   public String JavaDoc[] getTagArgs() {
34     return Empty.STRINGS;
35   }
36
37   public int handle(String JavaDoc[] args, int startIndex) {
38     if (setFlag()) {
39       return 0;
40     } else {
41       return -1;
42     }
43   }
44
45   public boolean isRequired() {
46     return false;
47   }
48
49   public abstract boolean setFlag();
50
51 }
52
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