01: /*
02: * Copyright 2005 John G. Wilson
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of 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,
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:
18: package groovy.util.slurpersupport;
19:
20: import java.util.Iterator;
21:
22: /**
23: * @author John Wilson
24: *
25: */
26:
27: public abstract class NodeIterator implements Iterator {
28: private final Iterator iter;
29: private Object nextNode;
30:
31: public NodeIterator(final Iterator iter) {
32: this .iter = iter;
33: this .nextNode = getNextNode(iter);
34: }
35:
36: public boolean hasNext() {
37: return this .nextNode != null;
38: }
39:
40: public Object next() {
41: try {
42: return this .nextNode;
43: } finally {
44: this .nextNode = getNextNode(this .iter);
45: }
46: }
47:
48: public void remove() {
49: throw new UnsupportedOperationException();
50: }
51:
52: protected abstract Object getNextNode(final Iterator iter);
53: }
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