01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * 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.apache.cocoon.components.expression;
18:
19: import java.util.Iterator;
20:
21: /**
22: * @version $Id: Expression.java 449189 2006-09-23 06:52:29Z crossley $
23: */
24: public interface Expression {
25:
26: Object evaluate(ExpressionContext context)
27: throws ExpressionException;
28:
29: Iterator iterate(ExpressionContext context)
30: throws ExpressionException;
31:
32: void assign(ExpressionContext context, Object value)
33: throws ExpressionException;
34:
35: String getExpression();
36:
37: String getLanguage();
38:
39: /*
40: * This method is added to handle that JXPath have two access methods
41: * getValue and getNode, where getNode gives direct access to the object
42: * while getValue might do some conversion of the object. I would prefer to
43: * get rid of the getNode method, but have not yet figured out how to get
44: * work in JXTG
45: */
46: Object getNode(ExpressionContext context)
47: throws ExpressionException;
48:
49: void setProperty(String property, Object value);
50: }
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