1 /*
2 *
3 * Copyright 2002-2004 The Ant-Contrib project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * 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.codehaus.mojo.natives.parser;
18
19 /**
20 * An base class for objects that represent the state of an AbstractParser.
21 *
22 * @author CurtArnold
23 * @see AbstractParser
24 */
25 public abstract class AbstractParserState
26 {
27 private AbstractParser parser;
28
29 protected AbstractParserState( AbstractParser parser )
30 {
31 if ( parser == null )
32 {
33 throw new NullPointerException( "parser" );
34 }
35 this.parser = parser;
36 }
37
38 /**
39 * Consume a character
40 *
41 * @return new state, may be null to ignore the rest of the line
42 */
43 public abstract AbstractParserState consume( char ch );
44
45 protected AbstractParser getParser()
46 {
47 return parser;
48 }
49 }