01: /*
02: * Copyright (c) 2003 The Visigoth Software Society. All rights
03: * reserved.
04: *
05: * Redistribution and use in source and binary forms, with or without
06: * modification, are permitted provided that the following conditions
07: * are met:
08: *
09: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: *
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in
14: * the documentation and/or other materials provided with the
15: * distribution.
16: *
17: * 3. The end-user documentation included with the redistribution, if
18: * any, must include the following acknowledgement:
19: * "This product includes software developed by the
20: * Visigoth Software Society (http://www.visigoths.org/)."
21: * Alternately, this acknowledgement may appear in the software itself,
22: * if and wherever such third-party acknowledgements normally appear.
23: *
24: * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
25: * project contributors may be used to endorse or promote products derived
26: * from this software without prior written permission. For written
27: * permission, please contact visigoths@visigoths.org.
28: *
29: * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
30: * nor may "FreeMarker" or "Visigoth" appear in their names
31: * without prior written permission of the Visigoth Software Society.
32: *
33: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
34: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
35: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
36: * DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
37: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
38: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
39: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
40: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
41: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
42: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
43: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44: * SUCH DAMAGE.
45: * ====================================================================
46: *
47: * This software consists of voluntary contributions made by many
48: * individuals on behalf of the Visigoth Software Society. For more
49: * information on the Visigoth Software Society, please see
50: * http://www.visigoths.org/
51: */
52:
53: package freemarker.template.utility;
54:
55: import java.util.List;
56: import freemarker.ext.beans.BeansWrapper;
57: import freemarker.template.*;
58: import freemarker.template.utility.ClassUtil;
59:
60: /**
61: * An object that you can make available in a template
62: * to instantiate arbitrary beans-wrapped objects in a template.
63: * Beware of this class's security implications. It allows
64: * the instantiation of arbitrary objects and invoking
65: * methods on them. Usage is something like:
66: * <br>
67: * <br>myDataModel.put("objectConstructor", new ObjectConstructor());
68: * <br>
69: * <br>And then from your FTL code:
70: * <br>
71: * <br><#assign aList = objectConstructor("java.util.ArrayList", 100)>
72: */
73:
74: public class ObjectConstructor implements TemplateMethodModelEx {
75: public Object exec(List args) throws TemplateModelException {
76: if (args.isEmpty()) {
77: throw new TemplateModelException(
78: "This method must have at least one argument, the name of the class to instantiate.");
79: }
80: String classname = args.get(0).toString();
81: Class cl = null;
82: try {
83: cl = ClassUtil.forName(classname);
84: } catch (Exception e) {
85: throw new TemplateModelException(e.getMessage());
86: }
87: BeansWrapper bw = BeansWrapper.getDefaultInstance();
88: Object obj = bw.newInstance(cl, args.subList(1, args.size()));
89: return bw.wrap(obj);
90: }
91: }
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