01: /**
02: * MVEL (The MVFLEX Expression Language)
03: *
04: * Copyright (C) 2007 Christopher Brock, MVFLEX/Valhalla Project and the Codehaus
05: *
06: * Licensed under the Apache License, Version 2.0 (the "License");
07: * you may not use this file except in compliance with the License.
08: * You may obtain a copy of the License at
09: *
10: * http://www.apache.org/licenses/LICENSE-2.0
11: *
12: * Unless required by applicable law or agreed to in writing, software
13: * distributed under the License is distributed on an "AS IS" BASIS,
14: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15: * See the License for the specific language governing permissions and
16: * limitations under the License.
17: *
18: */package org.mvel.util;
19:
20: import java.io.Serializable;
21:
22: public interface Stack extends Serializable {
23: public boolean isEmpty();
24:
25: public Object peek();
26:
27: public void add(Object obj);
28:
29: public void push(Object obj);
30:
31: public Object pushAndPeek(Object obj);
32:
33: public void push(Object obj1, Object obj2);
34:
35: public void push(Object obj1, Object obj2, Object obj3);
36:
37: public Object pop();
38:
39: public void discard();
40:
41: public void clear();
42:
43: public int size();
44:
45: public void showStack();
46: }
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