/**
* Copyright 2010 Molindo GmbH
*
* 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 at.molindo.notify.util;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.exception.MethodInvocationException;
import org.apache.velocity.exception.ParseErrorException;
import org.apache.velocity.exception.ResourceNotFoundException;
import org.apache.velocity.runtime.RuntimeConstants;
import org.apache.velocity.runtime.RuntimeInstance;
import org.apache.velocity.runtime.RuntimeServices;
import org.apache.velocity.runtime.parser.ParseException;
import at.molindo.notify.INotifyService.NotifyRuntimeException;
import at.molindo.notify.model.IParams;
import at.molindo.notify.render.IRenderService.RenderException;
import at.molindo.notify.render.velocity.SLF4JLogChute;
public class VelocityUtils {
private VelocityUtils() {
}
public static RuntimeServices newRuntime() {
try {
RuntimeInstance runtime = new RuntimeInstance();
runtime.setProperty(RuntimeConstants.RUNTIME_LOG_LOGSYSTEM, new SLF4JLogChute());
runtime.setProperty(RuntimeConstants.RUNTIME_REFERENCES_STRICT, true);
runtime.init();
return runtime;
} catch (Exception e) {
throw new NotifyRuntimeException("failed to init velocity runtime", e);
}
}
public static String merge(RuntimeServices runtime, String content, String templateName, IParams params)
throws RenderException {
return merge(newTemplate(runtime, content, templateName), params);
}
public static String merge(Template template, IParams params) throws RenderException {
try {
StringWriter writer = new StringWriter();
template.merge(new VelocityContext(params.newMap()), writer);
return writer.toString();
} catch (ResourceNotFoundException e) {
throw new RenderException("failed to render template " + template, e);
} catch (ParseErrorException e) {
throw new RenderException("failed to render template " + template, e);
} catch (MethodInvocationException e) {
throw new RenderException("failed to render template " + template, e);
} catch (IOException e) {
throw new RenderException("failed to render template " + template, e);
}
}
public static Template newTemplate(RuntimeServices runtime, String content, String templateName)
throws RenderException {
try {
Template vt = new Template();
vt.setRuntimeServices(runtime);
vt.setData(runtime.parse(new StringReader(content), templateName));
vt.initDocument();
return vt;
} catch (ParseException e) {
throw new RenderException("failed to parse template", e);
}
}
}