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+/*
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+Licensed to the Apache Software Foundation (ASF) under one
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+or more contributor license agreements. See the NOTICE file
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+distributed with this work for additional information
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+regarding copyright ownership. The ASF licenses this file
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+to you under the Apache License, Version 2.0 (the
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+"License"); you may not use this file except in compliance
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+with the License. You may obtain a copy of the License at
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+
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+ https://www.apache.org/licenses/LICENSE-2.0
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+
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+Unless required by applicable law or agreed to in writing,
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+software distributed under the License is distributed on an
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+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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+KIND, either express or implied. See the License for the
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+specific language governing permissions and limitations
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+under the License.
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+*/
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+
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+import java.io.File;
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+import java.io.FileInputStream;
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+import java.io.FileOutputStream;
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+import java.io.IOException;
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+import java.net.URL;
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+import java.nio.channels.Channels;
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+import java.nio.channels.ReadableByteChannel;
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+import java.util.Properties;
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+
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+public class MavenWrapperDownloader {
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+
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+ /**
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+ * Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided.
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+ */
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+ private static final String DEFAULT_DOWNLOAD_URL =
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+ "https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.4.2/maven-wrapper-0.4.2.jar";
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+
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+ /**
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+ * Path to the maven-wrapper.properties file, which might contain a downloadUrl property to
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+ * use instead of the default one.
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+ */
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+ private static final String MAVEN_WRAPPER_PROPERTIES_PATH =
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+ ".mvn/wrapper/maven-wrapper.properties";
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+
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+ /**
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+ * Path where the maven-wrapper.jar will be saved to.
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+ */
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+ private static final String MAVEN_WRAPPER_JAR_PATH =
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+ ".mvn/wrapper/maven-wrapper.jar";
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+
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+ /**
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+ * Name of the property which should be used to override the default download url for the wrapper.
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+ */
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+ private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl";
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+
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+ public static void main(String args[]) {
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+ System.out.println("- Downloader started");
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+ File baseDirectory = new File(args[0]);
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+ System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath());
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+
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+ // If the maven-wrapper.properties exists, read it and check if it contains a custom
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+ // wrapperUrl parameter.
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+ File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH);
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+ String url = DEFAULT_DOWNLOAD_URL;
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+ if (mavenWrapperPropertyFile.exists()) {
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+ FileInputStream mavenWrapperPropertyFileInputStream = null;
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+ try {
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+ mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile);
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+ Properties mavenWrapperProperties = new Properties();
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+ mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream);
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+ url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url);
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+ } catch (IOException e) {
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+ System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'");
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+ } finally {
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+ try {
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+ if (mavenWrapperPropertyFileInputStream != null) {
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+ mavenWrapperPropertyFileInputStream.close();
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+ }
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+ } catch (IOException e) {
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+ // Ignore ...
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+ }
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+ }
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+ }
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+ System.out.println("- Downloading from: : " + url);
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+
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+ File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH);
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+ if (!outputFile.getParentFile().exists()) {
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+ if (!outputFile.getParentFile().mkdirs()) {
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+ System.out.println(
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+ "- ERROR creating output direcrory '" + outputFile.getParentFile().getAbsolutePath() + "'");
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+ }
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+ }
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+ System.out.println("- Downloading to: " + outputFile.getAbsolutePath());
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+ try {
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+ downloadFileFromURL(url, outputFile);
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+ System.out.println("Done");
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+ System.exit(0);
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+ } catch (Throwable e) {
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+ System.out.println("- Error downloading");
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+ e.printStackTrace();
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+ System.exit(1);
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+ }
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+ }
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+
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+ private static void downloadFileFromURL(String urlString, File destination) throws Exception {
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+ URL website = new URL(urlString);
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+ ReadableByteChannel rbc;
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+ rbc = Channels.newChannel(website.openStream());
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+ FileOutputStream fos = new FileOutputStream(destination);
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+ fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
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+ fos.close();
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+ rbc.close();
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+ }
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+
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+}
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