/*
* 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.ext.beans;
import java.util.HashMap;
import java.util.Map;
import freemarker.template.TemplateHashModel;
import freemarker.template.TemplateModel;
import freemarker.template.TemplateModelException;
import freemarker.template.utility.ClassUtil;
/**
* Base class for hash models keyed by Java class names.
* @author Attila Szegedi
* @version $Id: ClassBasedModelFactory.java,v 1.1.2.2 2006/11/12 10:23:02 szegedia Exp $
*/
abstract class ClassBasedModelFactory implements TemplateHashModel {
private final BeansWrapper wrapper;
private final Map cache = new HashMap();
protected ClassBasedModelFactory(BeansWrapper wrapper) {
this.wrapper = wrapper;
}
public TemplateModel get(String key) throws TemplateModelException {
synchronized(cache) {
TemplateModel model = (TemplateModel)cache.get(key);
if(model == null) {
try {
Class clazz = ClassUtil.forName(key);
model = createModel(clazz);
// This is called so that we trigger the
// class-reloading detector. If there was a class reload,
// the wrapper will in turn call our clearCache method.
wrapper.introspectClass(clazz);
} catch(Exception e) {
throw new TemplateModelException(e);
}
cache.put(key, model);
}
return model;
}
}
void clearCache() {
synchronized(cache) {
cache.clear();
}
}
void removeIntrospectionInfo(Class clazz) {
synchronized(cache) {
cache.remove(clazz.getName());
}
}
public boolean isEmpty() {
return false;
}
protected abstract TemplateModel createModel(Class clazz)
throws TemplateModelException;
protected BeansWrapper getWrapper() {
return wrapper;
}
}