01: /*
02: * Copyright 2006 Google Inc.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License"); you may not
05: * use this file except in compliance with the License. You may obtain a copy of
06: * the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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[] getDefaultArgs() {
26: return null;
27: }
28:
29: public abstract String getPurpose();
30:
31: public abstract String getTag();
32:
33: public String[] getTagArgs() {
34: return Empty.STRINGS;
35: }
36:
37: public int handle(String[] 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: }
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