| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.creadur.tentacles; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.io.StringWriter; |
| import java.io.Writer; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.apache.velocity.VelocityContext; |
| import org.apache.velocity.app.VelocityEngine; |
| |
| public class TemplateBuilder { |
| private static final String LOG_TAG_NAME = TemplateBuilder.class.getName(); |
| |
| private final TentaclesResources tentaclesResources; |
| private final VelocityEngine engine; |
| private final IOSystem ioSystem; |
| private final String templateName; |
| private final Map<String, Object> templateContextMap = |
| new ConcurrentHashMap<String, Object>(); |
| |
| public TemplateBuilder(final String template, final IOSystem ioSystem, |
| final VelocityEngine engine, |
| final TentaclesResources tentaclesResources) { |
| this.templateName = template; |
| this.ioSystem = ioSystem; |
| this.engine = engine; |
| this.tentaclesResources = tentaclesResources; |
| } |
| |
| public TemplateBuilder add(final String key, final Object value) { |
| this.templateContextMap.put(key, value); |
| return this; |
| } |
| |
| public TemplateBuilder addAll(final Map<String, Object> map) { |
| this.templateContextMap.putAll(map); |
| return this; |
| } |
| |
| public String apply() { |
| final StringWriter writer = new StringWriter(); |
| |
| evaluate(writer); |
| |
| return writer.toString(); |
| } |
| |
| public File write(final File file) throws IOException { |
| this.ioSystem.writeString(file, apply()); |
| return file; |
| } |
| |
| private void evaluate(final Writer writer) { |
| try { |
| final Reader templateReader = |
| this.tentaclesResources.read(this.templateName); |
| |
| final VelocityContext context = |
| new VelocityContext(this.templateContextMap); |
| this.engine.evaluate(context, writer, LOG_TAG_NAME, templateReader); |
| |
| } catch (final IOException ioe) { |
| throw new RuntimeException("can't apply template " |
| + this.templateName, ioe); |
| } |
| } |
| |
| } |