/*
* Copyright (c) 2003 The Visigoth Software Society. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowledgement:
* "This product includes software developed by the
* Visigoth Software Society (http://www.visigoths.org/)."
* Alternately, this acknowledgement may appear in the software itself,
* if and wherever such third-party acknowledgements normally appear.
*
* 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
* project contributors may be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact visigoths@visigoths.org.
*
* 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
* nor may "FreeMarker" or "Visigoth" appear in their names
* without prior written permission of the Visigoth Software Society.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Visigoth Software Society. For more
* information on the Visigoth Software Society, please see
* http://www.visigoths.org/
*/
package freemarker.core;
import java.util.List;
import freemarker.ext.beans.BeansWrapper;
import freemarker.template.ObjectWrapper;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import freemarker.template.TemplateMethodModelEx;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
import freemarker.template.TemplateScalarModel;
/**
* A built-in that allows us to instantiate an instance of a java class.
* Usage is something like:
* <#assign foobar = "foo.bar.MyClass"?new() />
*/
class NewBI extends BuiltIn
{
static final Class TM_CLASS = TemplateModel.class;
static final Class BEAN_MODEL_CLASS = freemarker.ext.beans.BeanModel.class;
static Class JYTHON_MODEL_CLASS;
static {
try {
JYTHON_MODEL_CLASS = Class.forName("freemarker.ext.jython.JythonModel");
} catch (Throwable e) {
JYTHON_MODEL_CLASS = null;
}
}
TemplateModel _getAsTemplateModel(Environment env)
throws TemplateException
{
TemplateModel tm = target.getAsTemplateModel(env);
String classname = null;
try {
classname = ((TemplateScalarModel) tm).getAsString();
}
catch (ClassCastException cce) {
invalidTypeException(tm, target, env, "string");
}
catch (NullPointerException npe) {
throw new InvalidReferenceException(getStartLocation()
+ "\nCould not resolve expression: " + target, env);
}
return new ConstructorFunction(classname, env, target.getTemplate());
}
static class ConstructorFunction implements TemplateMethodModelEx {
private final Class cl;
private final Environment env;
public ConstructorFunction(String classname, Environment env, Template template) throws TemplateException {
this.env = env;
cl = env.getNewBuiltinClassResolver().resolve(classname, env, template);
if (!TM_CLASS.isAssignableFrom(cl)) {
throw new TemplateException("Class " + cl.getName() + " does not implement freemarker.template.TemplateModel", env);
}
if (BEAN_MODEL_CLASS.isAssignableFrom(cl)) {
throw new TemplateException("Bean Models cannot be instantiated using the ?new built-in", env);
}
if (JYTHON_MODEL_CLASS != null && JYTHON_MODEL_CLASS.isAssignableFrom(cl)) {
throw new TemplateException("Jython Models cannot be instantiated using the ?new built-in", env);
}
}
public Object exec(List arguments) throws TemplateModelException {
ObjectWrapper ow = env.getObjectWrapper();
BeansWrapper bw =
ow instanceof BeansWrapper
? (BeansWrapper)ow
: BeansWrapper.getDefaultInstance();
return bw.newInstance(cl, arguments);
}
}
}