01: /*
02: * Janino - An embedded Java[TM] compiler
03: *
04: * Copyright (c) 2006, Arno Unkrig
05: * All rights reserved.
06: *
07: * Redistribution and use in source and binary forms, with or without
08: * modification, are permitted provided that the following conditions
09: * are met:
10: *
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above
14: * copyright notice, this list of conditions and the following
15: * disclaimer in the documentation and/or other materials
16: * provided with the distribution.
17: * 3. The name of the author may not be used to endorse or promote
18: * products derived from this software without specific prior
19: * written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
25: * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27: * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
29: * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
31: * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32: */
33:
34: package org.codehaus.janino.util.iterator;
35:
36: import java.util.*;
37:
38: import org.codehaus.janino.*;
39:
40: /**
41: * An {@link java.util.Iterator} that iterates over scoped statements.
42: * This iterator is used to iterate over the objects that implement
43: * the Scope interface until there is no longer an enclosing scope.
44: */
45: public class ScopeIterator implements Iterator {
46: protected Java.Scope s;
47:
48: // Create ScopeIterator starting with the Scope that encloses
49: // the given Statement.
50:
51: public ScopeIterator(Java.Statement stmt) {
52: s = stmt.getEnclosingScope();
53: }
54:
55: // Create ScopeIterator starting with the given Scope.
56:
57: public ScopeIterator(Java.Scope es) {
58: s = es;
59: }
60:
61: public boolean hasNext() {
62: return (s instanceof Java.Scope);
63: }
64:
65: public Object next() {
66: return (s = s.getEnclosingScope());
67: }
68:
69: public void remove() {
70: throw new RuntimeException("unsupported remove()");
71: }
72: }
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