/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.mina.integration.ognl;
import java.beans.PropertyEditor;
import java.lang.reflect.Member;
import java.util.Map;
import ognl.OgnlContext;
import ognl.TypeConverter;
import org.apache.mina.integration.beans.PropertyEditorFactory;
/**
* {@link PropertyEditor}-based implementation of OGNL {@link TypeConverter}.
* This converter uses the {@link PropertyEditor} implementations in
* <tt>mina-integration-beans</tt> module to perform conversion. To use this
* converter:
* <pre><code>
* OgnlContext ctx = Ognl.createDefaultContext(root);
* ctx.put(OgnlContext.TYPE_CONVERTER_CONTEXT_KEY, new PropertyTypeConverter());
* </code></pre>
* You can also override {@link #getPropertyEditor(Class, String, Class)}
* method to have more control over how an appropriate {@link PropertyEditor}
* is chosen.
*
* @author The Apache MINA Project (dev@mina.apache.org)
* @version $Rev: 601229 $, $Date: 2007-12-05 08:13:18 +0100 (Wed, 05 Dec 2007) $
*/
public class PropertyTypeConverter implements TypeConverter {
@SuppressWarnings("unchecked")
public Object convertValue(Map ctx, Object target, Member member,
String attrName, Object value, Class toType) {
if (value == null) {
return null;
}
if (attrName == null) {
// I don't know why but OGNL gives null attrName almost always.
// Fortunately, we can get the actual attrName with a tiny hack.
OgnlContext ognlCtx = (OgnlContext) ctx;
attrName = ognlCtx.getCurrentNode().toString().replaceAll(
"[\" \']+", "");
}
if (toType.isAssignableFrom(value.getClass())) {
return value;
}
PropertyEditor e1 = getPropertyEditor(
target.getClass(), attrName, value.getClass());
if (e1 == null) {
throw new IllegalArgumentException("Can't convert "
+ value.getClass().getSimpleName() + " to "
+ String.class.getSimpleName());
}
e1.setValue(value);
PropertyEditor e2 = getPropertyEditor(
target.getClass(), attrName, toType);
if (e2 == null) {
throw new IllegalArgumentException("Can't convert "
+ String.class.getSimpleName() + " to "
+ toType.getSimpleName());
}
e2.setAsText(e1.getAsText());
return e2.getValue();
}
@SuppressWarnings("unused")
protected PropertyEditor getPropertyEditor(Class<?> type, String attrName, Class<?> attrType) {
return PropertyEditorFactory.getInstance(attrType);
}
}