Java tutorial
/* * Copyright 2013 the original author or authors. * * 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.springsource.sinspctr; import java.io.IOException; import java.io.InputStreamReader; import org.apache.commons.lang.StringUtils; import org.springframework.util.FileCopyUtils; /** * Provides utilities for rendering graphical console output. * * @author Gunnar Hillert * @author David Turanski * @since 1.0 */ public final class BannerUtils { private static final String LINE_SEPARATOR = System.getProperty("line.separator"); /** Prevent instantiation. */ private BannerUtils() { throw new AssertionError(); } /** * Retrieves the ASCII resource "banner.txt" from the classpath. Will also * use the version number from "MANIFEST.MF". * * Similar to * {@link org.springframework.shell.plugin.support.DefaultBannerProvider}. * * @return String representing the Banner. */ private static String getBanner() { final String banner = readBanner(); final String version = StringUtils.rightPad(BannerUtils.getVersion(), 33); final StringBuilder sb = new StringBuilder(); sb.append(String.format(banner, version)); sb.append(LINE_SEPARATOR); return sb.toString(); } private static String readBanner() { try { return FileCopyUtils .copyToString(new InputStreamReader( BannerUtils.class.getClassLoader().getResourceAsStream("banner.txt"))) .replaceAll("(\\r|\\n)+", LINE_SEPARATOR); } catch (IOException e) { throw new IllegalStateException("Could not read banner.txt"); } } public static String getVersion() { final Package pkg = BannerUtils.class.getPackage(); String version = null; if (pkg != null) { version = pkg.getImplementationVersion(); } return (version != null ? version : "Unknown Version"); } public static String displayBanner(String containerName, String additionalMessage) { StringBuffer sb = new StringBuffer(LINE_SEPARATOR); sb.append(getBanner()).append(StringUtils.isEmpty(additionalMessage) ? "" : additionalMessage) .append(LINE_SEPARATOR) .append(StringUtils.isEmpty(containerName) ? "" : "started container : " + containerName) .append(LINE_SEPARATOR); return sb.toString(); } }