/*
* Copyright 2013 eXo Platform SAS
*
* Licensed 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 juzu.impl.plugin.template;
import juzu.impl.plugin.ServiceContext;
import juzu.impl.plugin.ServiceDescriptor;
import juzu.impl.plugin.application.ApplicationService;
import juzu.impl.plugin.template.metadata.TemplateDescriptor;
import juzu.impl.template.spi.TemplateStub;
import juzu.impl.plugin.template.metadata.TemplatesDescriptor;
import juzu.impl.common.Path;
import juzu.template.TagHandler;
import java.lang.reflect.Field;
import java.util.concurrent.ConcurrentHashMap;
/** @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> */
public class TemplateService extends ApplicationService {
/** . */
private TemplatesDescriptor descriptor;
/** . */
private final ConcurrentHashMap<Path, TemplateStub> stubs;
/** . */
private ServiceContext context;
/** . */
private final ConcurrentHashMap<String, TagHandler> tags;
public TemplateService() {
super("template");
//
this.stubs = new ConcurrentHashMap<Path, TemplateStub>();
this.tags = new ConcurrentHashMap<String, TagHandler>();
}
public TemplatesDescriptor getDescriptor() {
return descriptor;
}
@Override
public ServiceDescriptor init(ServiceContext context) throws Exception {
this.context = context;
this.descriptor = new TemplatesDescriptor(application, context.getClassLoader(), context.getConfig());
return descriptor;
}
public TagHandler resolveTag(String name) {
TagHandler tag = tags.get(name);
if (tag == null) {
try {
Class<?> a = context.getClassLoader().loadClass(name);
Class<? extends TagHandler> tagHandlerClass = a.asSubclass(TagHandler.class);
tag = tagHandlerClass.newInstance();
tags.putIfAbsent(name, tag);
}
catch (Exception e) {
throw new UnsupportedOperationException("handle me gracefully", e);
}
}
return tag;
}
public TemplateStub resolveTemplateStub(String path) {
return resolveTemplateStub(juzu.impl.common.Path.parse(path));
}
public TemplateStub resolveTemplateStub(juzu.impl.common.Path path) {
TemplateStub stub = stubs.get(path);
if (stub == null) {
//
Path.Absolute resolved = descriptor.getPackage().resolve(path);
//
TemplateDescriptor desc;
try {
Class<?> clazz = context.getClassLoader().loadClass(resolved.getName().toString());
Field f = clazz.getField("DESCRIPTOR");
desc = (TemplateDescriptor)f.get(null);
}
catch (Exception e) {
throw new UnsupportedOperationException("Handle me gracefully", e);
}
//
stub = desc.getStub();
//
TemplateStub phantom = stubs.putIfAbsent(path, stub);
if (phantom != null) {
stub = phantom;
} else {
stub.init();
}
}
//
return stub;
}
}