01: /*
02: * Copyright 2002,2004 The Apache Software Foundation.
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: package org.apache.commons.jelly;
18:
19: /**
20: * <p><code>DynaTag</code> represents a Jelly custom tag which
21: * can take its attributes dynamically and store them in some data structure.
22: * Typically a DynaTag may use either a Map or a DynaBean to implement itself
23: * which avoids writing explicit getter and setter methods for each possible attribute.
24: * </p>
25: * <p>
26: * This kind of tag can be extremely useful when making HTML-like tags which
27: * generally output all the attributes which are used in the markup, except
28: * one or two special attributes are used, all others pass through.</p>
29: *
30: * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
31: * @version $Revision: 155420 $
32: */
33:
34: public interface DynaTag extends Tag {
35:
36: /** Sets an attribute value of this tag before the tag is invoked
37: */
38: public void setAttribute(String name, Object value)
39: throws JellyTagException;
40:
41: /**
42: * @return the type of the given attribute. By default just return
43: * Object.class if this is not known.
44: * If this method returns Expression.class then the expression will not
45: * be evaluated and just passed in as the attribute value.
46: */
47: public Class getAttributeType(String name) throws JellyTagException;
48: }
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