/*
* Copyright 2011 JBoss Inc
*
* 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 org.jbpm.formapi.server.render;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class RendererFactory {
private static final Log log = LogFactory.getLog(RendererFactory.class);
private static final RendererFactory INSTANCE = new RendererFactory();
private static final String DEFAULT_FILE = "/FormBuilder.properties";
private static final String LANGUAGES_PROPERTY_NAME = "form.builder.languages";
public static RendererFactory getInstance() {
return INSTANCE;
}
private final Map<String, Renderer> cache;
private RendererFactory() {
cache = new HashMap<String, Renderer>();
Properties props = new Properties();
try {
props.load(getClass().getResourceAsStream(DEFAULT_FILE));
String property = props.getProperty(LANGUAGES_PROPERTY_NAME);
String[] languages = property == null ? new String[0] : property.split(",");
for (String lang : languages) {
getRenderer(lang);
}
} catch (IOException e) {
log.error("Couldn't read file " + DEFAULT_FILE, e);
} catch (RendererException e) {
log.error("Couldn't initiate RendererFactory", e);
}
}
public Renderer getRenderer(String language) throws RendererException {
synchronized(this) {
if (!cache.containsKey(language)) {
String kclass = new StringBuilder("org.jbpm.formbuilder.server.render.").
append(language).append(".Renderer").toString();
Object obj = null;
try {
Class<?> klass = Class.forName(kclass);
obj = klass.newInstance();
} catch (Exception e) {
throw new RendererException("Couldn't find class " + kclass, e);
}
cache.put(language, (Renderer) obj);
}
}
return cache.get(language);
}
}