org.springframework.xd.dirt.server.util.BannerUtils.java Source code

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Here is the source code for org.springframework.xd.dirt.server.util.BannerUtils.java

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/*
 * 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.springframework.xd.dirt.server.util;

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.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).append("Documentation: https://github.com/SpringSource/spring-xd/wiki")
                .append(LINE_SEPARATOR);
        return sb.toString();
    }

}