1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * 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.mina.integration.ognl;
18
19 import java.beans.PropertyEditor;
20 import java.lang.reflect.Member;
21 import java.util.Map;
22
23 import ognl.OgnlContext;
24 import ognl.TypeConverter;
25
26 import org.apache.mina.integration.beans.PropertyEditorFactory;
27
28 /**
29 * {@link PropertyEditor}-based implementation of OGNL {@link TypeConverter}.
30 * This converter uses the {@link PropertyEditor} implementations in
31 * <tt>mina-integration-beans</tt> module to perform conversion. To use this
32 * converter:
33 * <pre><code>
34 * OgnlContext ctx = Ognl.createDefaultContext(root);
35 * ctx.put(OgnlContext.TYPE_CONVERTER_CONTEXT_KEY, new PropertyTypeConverter());
36 * </code></pre>
37 * You can also override {@link #getPropertyEditor(Class, String, Class)}
38 * method to have more control over how an appropriate {@link PropertyEditor}
39 * is chosen.
40 *
41 * @author The Apache MINA Project (dev@mina.apache.org)
42 */
43 public class PropertyTypeConverter implements TypeConverter {
44
45 @SuppressWarnings("unchecked")
46 public Object convertValue(Map ctx, Object target, Member member,
47 String attrName, Object value, Class toType) {
48 if (value == null) {
49 return null;
50 }
51
52 if (attrName == null) {
53 // I don't know why but OGNL gives null attrName almost always.
54 // Fortunately, we can get the actual attrName with a tiny hack.
55 OgnlContext ognlCtx = (OgnlContext) ctx;
56 attrName = ognlCtx.getCurrentNode().toString().replaceAll(
57 "[\" \']+", "");
58 }
59
60 if (toType.isAssignableFrom(value.getClass())) {
61 return value;
62 }
63
64 PropertyEditor e1 = getPropertyEditor(
65 target.getClass(), attrName, value.getClass());
66 if (e1 == null) {
67 throw new IllegalArgumentException("Can't convert "
68 + value.getClass().getSimpleName() + " to "
69 + String.class.getSimpleName());
70 }
71 e1.setValue(value);
72
73 PropertyEditor e2 = getPropertyEditor(
74 target.getClass(), attrName, toType);
75 if (e2 == null) {
76 throw new IllegalArgumentException("Can't convert "
77 + String.class.getSimpleName() + " to "
78 + toType.getSimpleName());
79 }
80
81 e2.setAsText(e1.getAsText());
82 return e2.getValue();
83 }
84
85 protected PropertyEditor getPropertyEditor(Class<?> type, String attrName, Class<?> attrType) {
86 return PropertyEditorFactory.getInstance(attrType);
87 }
88 }