01: /*
02: * JBoss, Home of Professional Open Source
03: * Copyright 2005, JBoss Inc., and individual contributors as indicated
04: * by the @authors tag. See the copyright.txt in the distribution for a
05: * full listing of individual contributors.
06: *
07: * This is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU Lesser General Public License as
09: * published by the Free Software Foundation; either version 2.1 of
10: * the License, or (at your option) any later version.
11: *
12: * This software is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15: * Lesser General Public License for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public
18: * License along with this software; if not, write to the Free
19: * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20: * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21: */
22: package org.jbpm.instantiation;
23:
24: import java.lang.reflect.Constructor;
25:
26: import org.apache.commons.logging.Log;
27: import org.apache.commons.logging.LogFactory;
28: import org.dom4j.DocumentException;
29: import org.dom4j.DocumentHelper;
30: import org.dom4j.Element;
31: import org.jbpm.JbpmException;
32:
33: public class XmlInstantiator implements Instantiator {
34:
35: private static final Class[] parameterTypes = new Class[] { Element.class };
36:
37: public Object instantiate(Class clazz, String configuration) {
38: Object newInstance = null;
39: try {
40: // parse the bean configuration
41: Element configurationElement = parseConfiguration(configuration);
42:
43: Constructor constructor = clazz
44: .getDeclaredConstructor(parameterTypes);
45: constructor.setAccessible(true);
46: newInstance = constructor
47: .newInstance(new Object[] { configurationElement });
48: } catch (Exception e) {
49: log.error("couldn't instantiate '" + clazz.getName() + "'",
50: e);
51: throw new JbpmException(e);
52: }
53: return newInstance;
54: }
55:
56: protected Element parseConfiguration(String configuration) {
57: Element element = null;
58: try {
59: element = DocumentHelper.parseText(
60: "<action>" + configuration + "</action>")
61: .getRootElement();
62: } catch (DocumentException e) {
63: log.error("couldn't parse bean configuration : "
64: + configuration, e);
65: throw new JbpmException(e);
66: }
67: return element;
68: }
69:
70: private static final Log log = LogFactory
71: .getLog(XmlInstantiator.class);
72: }
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