Further re-organization of launcher code

spring-boot-tools/spring-boot-loader/pom.xml

@@ -13,14 +13,15 @@
 		<main.basedir>${basedir}/../..</main.basedir>
 	</properties>
 	<dependencies>
-		<!-- TODO: maybe put these in the parent? -->
 		<dependency>
 			<groupId>org.slf4j</groupId>
 			<artifactId>jcl-over-slf4j</artifactId>
+			<scope>test</scope>
 		</dependency>
 		<dependency>
 			<groupId>ch.qos.logback</groupId>
 			<artifactId>logback-classic</artifactId>
+			<scope>test</scope>
 		</dependency>
 	</dependencies>
 	<build>

spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/AbstractLauncher.java

@@ -1,104 +0,0 @@
-/*
- * 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.boot.loader;
-
-import java.io.File;
-import java.net.URI;
-import java.security.CodeSource;
-import java.security.ProtectionDomain;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.logging.Logger;
-
-/**
- * Base class for launchers that can start an application with a fully configured
- * classpath.
- * 
- * @author Phillip Webb
- * @author Dave Syer
- */
-public abstract class AbstractLauncher implements ArchiveFilter {
-
-	private Logger logger = Logger.getLogger(AbstractLauncher.class.getName());
-
-	private LaunchHelper helper = new LaunchHelper();
-
-	/**
-	 * Launch the application. This method is the initial entry point that should be
-	 * called by a subclass {@code public static void main(String[] args)} method.
-	 * @param args the incoming arguments
-	 */
-	public void launch(String[] args) {
-		try {
-			launch(args, getClass().getProtectionDomain());
-		}
-		catch (Exception ex) {
-			ex.printStackTrace();
-			System.exit(1);
-		}
-	}
-
-	/**
-	 * Launch the application given the protection domain.
-	 * @param args the incoming arguments
-	 * @param protectionDomain the protection domain
-	 * @throws Exception
-	 */
-	protected void launch(String[] args, ProtectionDomain protectionDomain)
-			throws Exception {
-		CodeSource codeSource = protectionDomain.getCodeSource();
-		URI location = (codeSource == null ? null : codeSource.getLocation().toURI());
-		String path = (location == null ? null : location.getPath());
-		if (path == null) {
-			throw new IllegalStateException("Unable to determine code source archive");
-		}
-		File root = new File(path);
-		if (!root.exists()) {
-			throw new IllegalStateException(
-					"Unable to determine code source archive from " + root);
-		}
-		Archive archive = (root.isDirectory() ? new ExplodedArchive(root)
-				: new JarFileArchive(root));
-		launch(args, archive);
-	}
-
-	/**
-	 * Launch the application given the archive file
-	 * @param args the incoming arguments
-	 * @param archive the underlying (zip/war/jar) archive
-	 * @throws Exception
-	 */
-	protected void launch(String[] args, Archive archive) throws Exception {
-		List<Archive> lib = new ArrayList<Archive>();
-		lib.addAll(this.helper.findNestedArchives(archive, this));
-		this.logger.fine("Added " + lib.size() + " entries");
-		postProcessLib(archive, lib);
-		String mainClass = this.helper.getMainClass(archive);
-		this.helper.launch(args, mainClass, lib);
-	}
-
-	/**
-	 * Called to post-process lib entries before they are used. Implementations can add
-	 * and remove entries.
-	 * @param archive the archive
-	 * @param lib the existing lib
-	 * @throws Exception
-	 */
-	protected void postProcessLib(Archive archive, List<Archive> lib) throws Exception {
-	}
-
-}

spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/ExecutableArchiveLauncher.java

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2012-2013 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.boot.loader;
+
+import java.io.File;
+import java.net.URI;
+import java.security.CodeSource;
+import java.security.ProtectionDomain;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.jar.JarEntry;
+
+import org.springframework.boot.loader.archive.Archive;
+import org.springframework.boot.loader.archive.Archive.Entry;
+import org.springframework.boot.loader.archive.Archive.EntryFilter;
+import org.springframework.boot.loader.archive.ExplodedArchive;
+import org.springframework.boot.loader.archive.JarFileArchive;
+
+/**
+ * Base class for executable archive {@link Launcher}s.
+ * 
+ * @author Phillip Webb
+ */
+public abstract class ExecutableArchiveLauncher extends Launcher {
+
+	private final Archive archive;
+
+	public ExecutableArchiveLauncher() {
+		try {
+			this.archive = createArchive();
+		}
+		catch (Exception ex) {
+			throw new IllegalStateException(ex);
+		}
+	}
+
+	private Archive createArchive() throws Exception {
+		ProtectionDomain protectionDomain = getClass().getProtectionDomain();
+		CodeSource codeSource = protectionDomain.getCodeSource();
+		URI location = (codeSource == null ? null : codeSource.getLocation().toURI());
+		String path = (location == null ? null : location.getPath());
+		if (path == null) {
+			throw new IllegalStateException("Unable to determine code source archive");
+		}
+		File root = new File(path);
+		if (!root.exists()) {
+			throw new IllegalStateException(
+					"Unable to determine code source archive from " + root);
+		}
+		return (root.isDirectory() ? new ExplodedArchive(root) : new JarFileArchive(root));
+	}
+
+	protected final Archive getArchive() {
+		return this.archive;
+	}
+
+	@Override
+	protected String getMainClass() throws Exception {
+		return this.archive.getMainClass();
+	}
+
+	@Override
+	protected List<Archive> getClassPathArchives() throws Exception {
+		List<Archive> archives = new ArrayList<Archive>(
+				this.archive.getNestedArchives(new EntryFilter() {
+					@Override
+					public boolean matches(Entry entry) {
+						return isNestedArchive(entry);
+					}
+				}));
+		postProcessClassPathArchives(archives);
+		return archives;
+	}
+
+	/**
+	 * Determine if the specified {@link JarEntry} is a nested item that should be added
+	 * to the classpath. The method is called once for each entry.
+	 * @param entry the jar entry
+	 * @return {@code true} if the entry is a nested item (jar or folder)
+	 */
+	protected abstract boolean isNestedArchive(Archive.Entry entry);
+
+	/**
+	 * Called to post-process archive entries before they are used. Implementations can
+	 * add and remove entries.
+	 * @param archives the archives
+	 * @throws Exception
+	 */
+	protected void postProcessClassPathArchives(List<Archive> archives) throws Exception {
+	}
+
+}

spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/JarLauncher.java

@@ -18,26 +18,27 @@ package org.springframework.boot.loader;
 
 import java.util.List;
 
+import org.springframework.boot.loader.archive.Archive;
+
 /**
- * {@link AbstractLauncher} for JAR based archives. This launcher assumes that dependency
+ * {@link Launcher} for JAR based archives. This launcher assumes that dependency jars are
- * jars are included inside a {@code /lib} directory.
+ * included inside a {@code /lib} directory.
  * 
  * @author Phillip Webb
  */
-public class JarLauncher extends AbstractLauncher {
+public class JarLauncher extends ExecutableArchiveLauncher {
-
-	public static void main(String[] args) {
-		new JarLauncher().launch(args);
-	}
 
 	@Override
-	public boolean isArchive(Archive.Entry entry) {
+	protected boolean isNestedArchive(Archive.Entry entry) {
 		return !entry.isDirectory() && entry.getName().startsWith("lib/");
 	}
 
 	@Override
-	protected void postProcessLib(Archive archive, List<Archive> lib) throws Exception {
+	protected void postProcessClassPathArchives(List<Archive> archives) throws Exception {
-		lib.add(0, archive);
+		archives.add(0, getArchive());
 	}
 
+	public static void main(String[] args) {
+		new JarLauncher().launch(args);
+	}
 }

spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/LaunchedURLClassLoader.java

@@ -25,7 +25,7 @@ import java.security.PrivilegedExceptionAction;
 import org.springframework.boot.loader.jar.RandomAccessJarFile;
 
 /**
- * {@link ClassLoader} used by the {@link AbstractLauncher}.
+ * {@link ClassLoader} used by the {@link Launcher}.
  * 
  * @author Phillip Webb
  */

spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/Launcher.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2013 the original author or authors.
+ * 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.
@@ -22,79 +22,64 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.logging.Logger;
 
+import org.springframework.boot.loader.archive.Archive;
+
 /**
- * Common convenience methods shared by launcher implementations.
+ * Base class for launchers that can start an application with a fully configured
+ * classpath backed by one or more {@link Archive}s.
  * 
+ * @author Phillip Webb
  * @author Dave Syer
  */
-public class LaunchHelper {
+public abstract class Launcher {
 
-	private Logger logger = Logger.getLogger(LaunchHelper.class.getName());
+	protected Logger logger = Logger.getLogger(Launcher.class.getName());
 
 	/**
 	 * The main runner class. This must be loaded by the created ClassLoader so cannot be
 	 * directly referenced.
 	 */
-	private static final String RUNNER_CLASS = AbstractLauncher.class.getPackage()
+	private static final String RUNNER_CLASS = Launcher.class.getPackage().getName()
-			.getName() + ".MainMethodRunner";
+			+ ".MainMethodRunner";
 
 	/**
+	 * Launch the application. This method is the initial entry point that should be
+	 * called by a subclass {@code public static void main(String[] args)} method.
 	 * @param args the incoming arguments
-	 * @param mainClass the main class
-	 * @param lib a collection of archives (zip/jar/war or directory)
-	 * @throws Exception
 	 */
-	public void launch(String[] args, String mainClass, List<Archive> lib)
+	protected void launch(String[] args) {
-			throws Exception {
+		try {
-		ClassLoader classLoader = createClassLoader(lib);
+			ClassLoader classLoader = createClassLoader(getClassPathArchives());
-		launch(args, mainClass, classLoader);
+			launch(args, getMainClass(), classLoader);
+		}
+		catch (Exception ex) {
+			ex.printStackTrace();
+			System.exit(1);
+		}
 	}
 
 	/**
-	 * @param archive the archive to search
+	 * Create a classloader for the specified archives.
-	 * @return an accumulation of nested archives
+	 * @param archives the archives
-	 * @throws Exception
-	 */
-	public List<Archive> findNestedArchives(Archive archive, ArchiveFilter filter)
-			throws Exception {
-		List<Archive> lib = new ArrayList<Archive>();
-		for (Archive.Entry entry : archive.getEntries()) {
-			if (filter.isArchive(entry)) {
-				this.logger.fine("Adding: " + entry.getName());
-				lib.add(archive.getNestedArchive(entry));
-			}
-		}
-		return lib;
-	}
-
-	/**
-	 * Obtain the main class that should be used to launch the application. By default
-	 * this method uses a {@code Start-Class} manifest entry.
-	 * @param archive the archive
-	 * @return the main class
-	 * @throws Exception
-	 */
-	public String getMainClass(Archive archive) throws Exception {
-		String mainClass = archive.getManifest().getMainAttributes()
-				.getValue("Start-Class");
-		if (mainClass == null) {
-			throw new IllegalStateException("No 'Start-Class' manifest entry specified");
-		}
-		return mainClass;
-	}
-
-	/**
-	 * Create a classloader for the specified lib.
-	 * @param lib the lib
 	 * @return the classloader
 	 * @throws Exception
 	 */
-	protected ClassLoader createClassLoader(List<Archive> lib) throws Exception {
+	protected ClassLoader createClassLoader(List<Archive> archives) throws Exception {
-		URL[] urls = new URL[lib.size()];
+		List<URL> urls = new ArrayList<URL>(archives.size());
-		for (int i = 0; i < urls.length; i++) {
+		for (Archive archive : archives) {
-			urls[i] = lib.get(i).getUrl();
+			urls.add(archive.getUrl());
 		}
-		return createClassLoader(urls);
+		return createClassLoader(urls.toArray(new URL[urls.size()]));
+	}
+
+	/**
+	 * Create a classloader for the specified URLs
+	 * @param urls the URLs
+	 * @return the classloader
+	 * @throws Exception
+	 */
+	protected ClassLoader createClassLoader(URL[] urls) throws Exception {
+		return new LaunchedURLClassLoader(urls, getClass().getClassLoader());
 	}
 
 	/**
@@ -113,16 +98,6 @@ public class LaunchHelper {
 		runnerThread.start();
 	}
 
-	/**
-	 * Create a classloader for the specified URLs
-	 * @param urls the URLs
-	 * @return the classloader
-	 * @throws Exception
-	 */
-	protected ClassLoader createClassLoader(URL[] urls) throws Exception {
-		return new LaunchedURLClassLoader(urls, getClass().getClassLoader());
-	}
-
 	/**
 	 * Create the {@code MainMethodRunner} used to launch the application.
 	 * @param mainClass the main class
@@ -139,4 +114,17 @@ public class LaunchHelper {
 		return (Runnable) constructor.newInstance(mainClass, args);
 	}
 
+	/**
+	 * Returns the main class that should be launched.
+	 * @return the name of the main class
+	 * @throws Exception
+	 */
+	protected abstract String getMainClass() throws Exception;
+
+	/**
+	 * Returns the archives that will be used to construct the class path.
+	 * @return the class path archives
+	 * @throws Exception
+	 */
+	protected abstract List<Archive> getClassPathArchives() throws Exception;
 }

spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/MainMethodRunner.java

@@ -19,8 +19,8 @@ package org.springframework.boot.loader;
 import java.lang.reflect.Method;
 
 /**
- * Utility class that used by {@link AbstractLauncher}s to call a main method. This class allows
+ * Utility class that used by {@link Launcher}s to call a main method. This class allows
- * methods to be executed within a thread configured with a specific context classloader.
+ * methods to be executed within a thread configured with a specific context class loader.
  * 
  * @author Phillip Webb
  */

spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/PropertiesLauncher.java

@@ -30,11 +30,15 @@ import java.util.List;
 import java.util.Properties;
 import java.util.logging.Logger;
 
+import org.springframework.boot.loader.archive.Archive;
+import org.springframework.boot.loader.archive.Archive.Entry;
+import org.springframework.boot.loader.archive.Archive.EntryFilter;
+import org.springframework.boot.loader.archive.ExplodedArchive;
 import org.springframework.boot.loader.util.SystemPropertyUtils;
 
 /**
- * {@link AbstractLauncher} for archives with user-configured classpath and main class via
+ * {@link Launcher} for archives with user-configured classpath and main class via a
- * a properties file. This model is often more flexible and more amenable to creating
+ * properties file. This model is often more flexible and more amenable to creating
  * well-behaved OS-level services than a model based on executable jars.
  * 
  * <p>
@@ -60,9 +64,9 @@ import org.springframework.boot.loader.util.SystemPropertyUtils;
  * 
  * @author Dave Syer
  */
-public class PropertiesLauncher implements ArchiveFilter {
+public class PropertiesLauncher extends Launcher {
 
-	private Logger logger = Logger.getLogger(AbstractLauncher.class.getName());
+	private Logger logger = Logger.getLogger(Launcher.class.getName());
 
 	/**
 	 * Properties key for main class
@@ -105,92 +109,28 @@ public class PropertiesLauncher implements ArchiveFilter {
 
 	private static final List<String> DEFAULT_PATHS = Arrays.asList("lib/");
 
+	private final File home;
+
 	private List<String> paths = new ArrayList<String>(DEFAULT_PATHS);
 
 	private Properties properties = new Properties();
 
-	private LaunchHelper helper = new LaunchHelper();
+	public PropertiesLauncher() {
-
-	public static void main(String[] args) {
-		new PropertiesLauncher().launch(args);
-	}
-
-	/**
-	 * Launch the application. This method is the initial entry point that should be
-	 * called by a subclass {@code public static void main(String[] args)} method.
-	 * @param args the incoming arguments
-	 */
-	public void launch(String[] args) {
 		try {
-			File home = getHomeDirectory();
+			this.home = getHomeDirectory();
-			initialize(home);
+			initializeProperties(this.home);
-			this.helper.launch(args, getMainClass(home), getLibrary(home, this.paths));
+			initializePaths();
 		}
 		catch (Exception ex) {
-			ex.printStackTrace();
+			throw new IllegalStateException(ex);
-			System.exit(1);
 		}
 	}
 
-	@Override
-	public boolean isArchive(Archive.Entry entry) {
-		return entry.isDirectory() || isArchive(entry.getName());
-	}
-
 	protected File getHomeDirectory() {
 		return new File(SystemPropertyUtils.resolvePlaceholders(System.getProperty(HOME,
 				"${user.dir}")));
 	}
 
-	protected String getMainClass(File home) throws Exception {
-		if (System.getProperty(MAIN) != null) {
-			return SystemPropertyUtils.resolvePlaceholders(System.getProperty(MAIN));
-		}
-		if (this.properties.containsKey(MAIN)) {
-			return SystemPropertyUtils.resolvePlaceholders(this.properties
-					.getProperty(MAIN));
-		}
-		return this.helper.getMainClass(new ExplodedArchive(home));
-	}
-
-	protected void initialize(File home) throws Exception {
-		initializeProperties(home);
-		initializePaths();
-	}
-
-	private boolean isArchive(String name) {
-		return name.endsWith(".jar") || name.endsWith(".zip");
-	}
-
-	/**
-	 * Search the configured paths and look for nested archives.
-	 * 
-	 * @param home the home directory for this launch
-	 * @param paths the directory roots for classpath entries
-	 * @return a library of archives that can be used as a classpath
-	 * @throws Exception
-	 */
-	private List<Archive> getLibrary(File home, List<String> paths) throws Exception {
-		List<Archive> lib = new ArrayList<Archive>();
-		for (String path : paths) {
-			String root = cleanupPath(stripFileUrlPrefix(path));
-			File file = new File(root);
-			if (!root.startsWith("/")) {
-				file = new File(home, root);
-			}
-			if (file.isDirectory()) {
-				this.logger.info("Adding classpath entries from " + path);
-				Archive archive = new ExplodedArchive(file);
-				lib.addAll(this.helper.findNestedArchives(archive, this));
-				lib.add(0, archive);
-			}
-			else {
-				this.logger.info("No directory found at " + path);
-			}
-		}
-		return lib;
-	}
-
 	private void initializeProperties(File home) throws Exception, IOException {
 		String config = SystemPropertyUtils.resolvePlaceholders(System.getProperty(
 				CONFIG_NAME, "application")) + ".properties";
@@ -346,6 +286,46 @@ public class PropertiesLauncher implements ArchiveFilter {
 		return paths;
 	}
 
+	@Override
+	protected String getMainClass() throws Exception {
+		if (System.getProperty(MAIN) != null) {
+			return SystemPropertyUtils.resolvePlaceholders(System.getProperty(MAIN));
+		}
+		if (this.properties.containsKey(MAIN)) {
+			return SystemPropertyUtils.resolvePlaceholders(this.properties
+					.getProperty(MAIN));
+		}
+		return new ExplodedArchive(this.home).getMainClass();
+	}
+
+	@Override
+	protected List<Archive> getClassPathArchives() throws Exception {
+		List<Archive> lib = new ArrayList<Archive>();
+		for (String path : this.paths) {
+			String root = cleanupPath(stripFileUrlPrefix(path));
+			File file = new File(root);
+			if (!root.startsWith("/")) {
+				file = new File(this.home, root);
+			}
+			if (file.isDirectory()) {
+				this.logger.info("Adding classpath entries from " + path);
+				Archive archive = new ExplodedArchive(file);
+				lib.addAll(archive.getNestedArchives(new EntryFilter() {
+					@Override
+					public boolean matches(Entry entry) {
+						return entry.isDirectory() || entry.getName().endsWith(".jar")
+								|| entry.getName().endsWith(".zip");
+					}
+				}));
+				lib.add(0, archive);
+			}
+			else {
+				this.logger.info("No directory found at " + path);
+			}
+		}
+		return lib;
+	}
+
 	private String cleanupPath(String path) {
 		path = path.trim();
 		// Always a directory
@@ -359,4 +339,8 @@ public class PropertiesLauncher implements ArchiveFilter {
 		return path;
 	}
 
+	public static void main(String[] args) {
+		new PropertiesLauncher().launch(args);
+	}
+
 }

spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/WarLauncher.java

@@ -19,21 +19,19 @@ package org.springframework.boot.loader;
 import java.io.IOException;
 import java.util.List;
 
+import org.springframework.boot.loader.archive.Archive;
+
 /**
- * {@link AbstractLauncher} for WAR based archives. This launcher for standard WAR
+ * {@link Launcher} for WAR based archives. This launcher for standard WAR archives.
- * archives. Supports dependencies in {@code WEB-INF/lib} as well as
+ * Supports dependencies in {@code WEB-INF/lib} as well as {@code WEB-INF/lib-provided},
- * {@code WEB-INF/lib-provided}, classes are loaded from {@code WEB-INF/classes}.
+ * classes are loaded from {@code WEB-INF/classes}.
  * 
  * @author Phillip Webb
  */
-public class WarLauncher extends AbstractLauncher {
+public class WarLauncher extends ExecutableArchiveLauncher {
-
-	public static void main(String[] args) {
-		new WarLauncher().launch(args);
-	}
 
 	@Override
-	public boolean isArchive(Archive.Entry entry) {
+	public boolean isNestedArchive(Archive.Entry entry) {
 		if (entry.isDirectory()) {
 			return entry.getName().equals("WEB-INF/classes/");
 		}
@@ -44,20 +42,18 @@ public class WarLauncher extends AbstractLauncher {
 	}
 
 	@Override
-	protected void postProcessLib(Archive archive, List<Archive> lib) throws Exception {
+	protected void postProcessClassPathArchives(List<Archive> archives) throws Exception {
-		lib.add(0, filterArchive(archive));
+		archives.add(0, getFilteredArchive());
 	}
 
 	/**
 	 * Filter the specified WAR file to exclude elements that should not appear on the
 	 * classpath.
-	 * @param archive the source archive
 	 * @return the filtered archive
 	 * @throws IOException on error
 	 */
-	protected Archive filterArchive(Archive archive) throws IOException {
+	protected Archive getFilteredArchive() throws IOException {
-		return archive.getFilteredArchive(new Archive.EntryFilter() {
+		return getArchive().getFilteredArchive(new Archive.EntryRenameFilter() {
-
 			@Override
 			public String apply(String entryName, Archive.Entry entry) {
 				if (entryName.startsWith("META-INF/") || entryName.startsWith("WEB-INF/")) {
@@ -68,4 +64,7 @@ public class WarLauncher extends AbstractLauncher {
 		});
 	}
 
+	public static void main(String[] args) {
+		new WarLauncher().launch(args);
+	}
 }

spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/archive/Archive.java

@@ -14,48 +14,67 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.loader;
+package org.springframework.boot.loader.archive;
 
 import java.io.IOException;
 import java.net.MalformedURLException;
 import java.net.URL;
+import java.util.Collection;
+import java.util.List;
 import java.util.jar.Manifest;
 
+import org.springframework.boot.loader.Launcher;
+
 /**
- * An archive that can be launched by the {@link AbstractLauncher}.
+ * An archive that can be launched by the {@link Launcher}.
  * 
  * @author Phillip Webb
  * @see JarFileArchive
  */
-public interface Archive {
+public abstract class Archive {
-
-	/**
-	 * Returns the manifest of the archive.
-	 * @return the manifest
-	 * @throws IOException
-	 */
-	Manifest getManifest() throws IOException;
-
-	/**
-	 * Returns archive entries.
-	 * @return the archive entries
-	 */
-	Iterable<Entry> getEntries();
 
 	/**
 	 * Returns a URL that can be used to load the archive.
 	 * @return the archive URL
 	 * @throws MalformedURLException
 	 */
-	URL getUrl() throws MalformedURLException;
+	public abstract URL getUrl() throws MalformedURLException;
 
 	/**
-	 * Returns a nest archive from on the the contained entries.
+	 * Obtain the main class that should be used to launch the application. By default
-	 * @param entry the entry (may be a directory or file)
+	 * this method uses a {@code Start-Class} manifest entry.
-	 * @return the nested archive
+	 * @return the main class
+	 * @throws Exception
+	 */
+	public String getMainClass() throws Exception {
+		String mainClass = getManifest().getMainAttributes().getValue("Start-Class");
+		if (mainClass == null) {
+			throw new IllegalStateException("No 'Start-Class' manifest entry specified");
+		}
+		return mainClass;
+	}
+
+	/**
+	 * Returns the manifest of the archive.
+	 * @return the manifest
 	 * @throws IOException
 	 */
-	Archive getNestedArchive(Entry entry) throws IOException;
+	public abstract Manifest getManifest() throws IOException;
+
+	/**
+	 * Returns all entries from the archive.
+	 * @return the archive entries
+	 */
+	public abstract Collection<Entry> getEntries();
+
+	/**
+	 * Returns nested {@link Archive}s for entries that match the specified filter.
+	 * @param filter the filter used to limit entries
+	 * @return nested archives
+	 * @throws IOException
+	 */
+	public abstract List<Archive> getNestedArchives(EntryFilter filter)
+			throws IOException;
 
 	/**
 	 * Returns a filtered version of the archive.
@@ -63,7 +82,8 @@ public interface Archive {
 	 * @return a filter archive
 	 * @throws IOException
 	 */
-	Archive getFilteredArchive(EntryFilter filter) throws IOException;
+	public abstract Archive getFilteredArchive(EntryRenameFilter filter)
+			throws IOException;
 
 	/**
 	 * Represents a single entry in the archive.
@@ -85,10 +105,24 @@ public interface Archive {
 	}
 
 	/**
-	 * A filter for archive entries.
+	 * Strategy interface to filter {@link Entry Entries}.
 	 */
 	public static interface EntryFilter {
 
+		/**
+		 * Apply the jar entry filter.
+		 * @param entry the entry to filter
+		 * @return {@code true} if the filter matches
+		 */
+		boolean matches(Entry entry);
+
+	}
+
+	/**
+	 * Strategy interface to filter or rename {@link Entry Entries}.
+	 */
+	public static interface EntryRenameFilter {
+
 		/**
 		 * Apply the jar entry filter.
 		 * @param entryName the current entry name. This may be different that the

spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/archive/ExplodedArchive.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.loader;
+package org.springframework.boot.loader.archive;
 
 import java.io.File;
 import java.io.FileInputStream;
@@ -24,10 +24,13 @@ import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLConnection;
 import java.net.URLStreamHandler;
+import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.LinkedHashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.jar.Manifest;
@@ -37,7 +40,7 @@ import java.util.jar.Manifest;
  * 
  * @author Phillip Webb
  */
-public class ExplodedArchive implements Archive {
+public class ExplodedArchive extends Archive {
 
 	private static final Set<String> SKIPPED_NAMES = new HashSet<String>(Arrays.asList(
 			".", ".."));
@@ -82,6 +85,12 @@ public class ExplodedArchive implements Archive {
 		}
 	}
 
+	@Override
+	public URL getUrl() throws MalformedURLException {
+		FilteredURLStreamHandler handler = new FilteredURLStreamHandler();
+		return new URL("file", "", -1, this.root.getAbsolutePath() + "/", handler);
+	}
+
 	@Override
 	public Manifest getManifest() throws IOException {
 		if (this.manifest == null && this.entries.containsKey(MANIFEST_ENTRY_NAME)) {
@@ -98,25 +107,28 @@ public class ExplodedArchive implements Archive {
 	}
 
 	@Override
-	public Iterable<Entry> getEntries() {
+	public List<Archive> getNestedArchives(EntryFilter filter) throws IOException {
-		return this.entries.values();
+		List<Archive> nestedArchives = new ArrayList<Archive>();
+		for (Entry entry : getEntries()) {
+			if (filter.matches(entry)) {
+				nestedArchives.add(getNestedArchive(entry));
+			}
+		}
+		return Collections.unmodifiableList(nestedArchives);
 	}
 
 	@Override
-	public URL getUrl() throws MalformedURLException {
+	public Collection<Entry> getEntries() {
-		FilteredURLStreamHandler handler = new FilteredURLStreamHandler();
+		return Collections.unmodifiableCollection(this.entries.values());
-		return new URL("file", "", -1, this.root.getAbsolutePath() + "/", handler);
-		// return this.root.toURI().toURL();
 	}
 
-	@Override
+	protected Archive getNestedArchive(Entry entry) throws IOException {
-	public Archive getNestedArchive(Entry entry) throws IOException {
 		File file = ((FileEntry) entry).getFile();
 		return (file.isDirectory() ? new ExplodedArchive(file) : new JarFileArchive(file));
 	}
 
 	@Override
-	public Archive getFilteredArchive(EntryFilter filter) throws IOException {
+	public Archive getFilteredArchive(EntryRenameFilter filter) throws IOException {
 		Map<String, Entry> filteredEntries = new LinkedHashMap<String, Archive.Entry>();
 		for (Map.Entry<String, Entry> entry : this.entries.entrySet()) {
 			String filteredName = filter.apply(entry.getKey(), entry.getValue());

spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/archive/JarFileArchive.java

@@ -14,13 +14,14 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.loader;
+package org.springframework.boot.loader.archive;
 
 import java.io.File;
 import java.io.IOException;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.Enumeration;
 import java.util.List;
@@ -35,7 +36,7 @@ import org.springframework.boot.loader.jar.RandomAccessJarFile;
  * 
  * @author Phillip Webb
  */
-public class JarFileArchive implements Archive {
+public class JarFileArchive extends Archive {
 
 	private final RandomAccessJarFile jarFile;
 
@@ -55,30 +56,40 @@ public class JarFileArchive implements Archive {
 		this.entries = Collections.unmodifiableList(jarFileEntries);
 	}
 
-	@Override
-	public Manifest getManifest() throws IOException {
-		return this.jarFile.getManifest();
-	}
-
-	@Override
-	public Iterable<Entry> getEntries() {
-		return this.entries;
-	}
-
 	@Override
 	public URL getUrl() throws MalformedURLException {
 		return this.jarFile.getUrl();
 	}
 
 	@Override
-	public Archive getNestedArchive(Entry entry) throws IOException {
+	public Manifest getManifest() throws IOException {
+		return this.jarFile.getManifest();
+	}
+
+	@Override
+	public List<Archive> getNestedArchives(EntryFilter filter) throws IOException {
+		List<Archive> nestedArchives = new ArrayList<Archive>();
+		for (Entry entry : getEntries()) {
+			if (filter.matches(entry)) {
+				nestedArchives.add(getNestedArchive(entry));
+			}
+		}
+		return Collections.unmodifiableList(nestedArchives);
+	}
+
+	@Override
+	public Collection<Entry> getEntries() {
+		return Collections.unmodifiableCollection(this.entries);
+	}
+
+	protected Archive getNestedArchive(Entry entry) throws IOException {
 		JarEntry jarEntry = ((JarFileEntry) entry).getJarEntry();
 		RandomAccessJarFile jarFile = this.jarFile.getNestedJarFile(jarEntry);
 		return new JarFileArchive(jarFile);
 	}
 
 	@Override
-	public Archive getFilteredArchive(final EntryFilter filter) throws IOException {
+	public Archive getFilteredArchive(final EntryRenameFilter filter) throws IOException {
 		RandomAccessJarFile filteredJar = this.jarFile
 				.getFilteredJarFile(new JarEntryFilter() {
 					@Override

spring-boot-tools/spring-boot-loader/src/main/java/org/springframework/boot/loader/archive/package-info.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2013 the original author or authors.
+ * 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.
@@ -14,13 +14,11 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.loader;
-
 /**
- * @author Dave Syer
+ * Abstraction over logical Archives be they backed by a JAR file or unpacked into a
+ * folder.
+ *
+ * @see org.springframework.boot.loader.archive.Archive
  */
-public interface ArchiveFilter {
+package org.springframework.boot.loader.archive;
 
-	public boolean isArchive(Archive.Entry entry);
-
-}

spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/PropertiesLauncherTests.java

@@ -17,63 +17,72 @@
 package org.springframework.boot.loader;
 
 import java.io.File;
+import java.io.IOException;
 
 import org.junit.After;
+import org.junit.Before;
 import org.junit.Test;
 import org.springframework.test.util.ReflectionTestUtils;
 
 import static org.junit.Assert.assertEquals;
 
 /**
+ * Tests for {@link PropertiesLauncher}.
+ * 
  * @author Dave Syer
  */
 public class PropertiesLauncherTests {
 
-	private PropertiesLauncher launcher = new PropertiesLauncher();
+	@Before
+	public void setup() throws IOException {
+		System.setProperty("loader.home",
+				new File("src/test/resources").getAbsolutePath());
+	}
 
 	@After
 	public void close() {
-		System.clearProperty("loader.system");
 		System.clearProperty("loader.home");
 		System.clearProperty("loader.path");
 		System.clearProperty("loader.main");
 		System.clearProperty("loader.config.name");
 		System.clearProperty("loader.config.location");
+		System.clearProperty("loader.system");
 	}
 
 	@Test
 	public void testDefaultHome() {
-		assertEquals(new File(System.getProperty("user.dir")),
+		PropertiesLauncher launcher = new PropertiesLauncher();
-				this.launcher.getHomeDirectory());
+		assertEquals(new File(System.getProperty("loader.home")),
+				launcher.getHomeDirectory());
 	}
 
 	@Test
 	public void testUserSpecifiedMain() throws Exception {
-		this.launcher.initialize(new File("."));
+		PropertiesLauncher launcher = new PropertiesLauncher();
-		assertEquals("demo.Application", this.launcher.getMainClass(null));
+		assertEquals("demo.Application", launcher.getMainClass());
 		assertEquals(null, System.getProperty("loader.main"));
 	}
 
 	@Test
 	public void testUserSpecifiedConfigName() throws Exception {
+
 		System.setProperty("loader.config.name", "foo");
-		this.launcher.initialize(new File("."));
+		PropertiesLauncher launcher = new PropertiesLauncher();
-		assertEquals("my.Application", this.launcher.getMainClass(null));
+		assertEquals("my.Application", launcher.getMainClass());
-		assertEquals("[etc/]", ReflectionTestUtils.getField(this.launcher, "paths")
+		assertEquals("[etc/]", ReflectionTestUtils.getField(launcher, "paths").toString());
-				.toString());
 	}
 
 	@Test
 	public void testSystemPropertySpecifiedMain() throws Exception {
 		System.setProperty("loader.main", "foo.Bar");
-		this.launcher.initialize(new File("."));
+		PropertiesLauncher launcher = new PropertiesLauncher();
-		assertEquals("foo.Bar", this.launcher.getMainClass(null));
+		assertEquals("foo.Bar", launcher.getMainClass());
 	}
 
 	@Test
 	public void testSystemPropertiesSet() throws Exception {
 		System.setProperty("loader.system", "true");
-		this.launcher.initialize(new File("."));
+		new PropertiesLauncher();
 		assertEquals("demo.Application", System.getProperty("loader.main"));
 	}
 

spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/archive/ExplodedArchiveTests.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.loader;
+package org.springframework.boot.loader.archive;
 
 import java.io.File;
 import java.io.FileOutputStream;
@@ -33,7 +33,10 @@ import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.TemporaryFolder;
-import org.springframework.boot.loader.Archive.Entry;
+import org.springframework.boot.loader.TestJarCreator;
+import org.springframework.boot.loader.archive.Archive;
+import org.springframework.boot.loader.archive.Archive.Entry;
+import org.springframework.boot.loader.archive.ExplodedArchive;
 
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.nullValue;
@@ -126,7 +129,7 @@ public class ExplodedArchiveTests {
 	@Test
 	public void getFilteredArchive() throws Exception {
 		Archive filteredArchive = this.archive
-				.getFilteredArchive(new Archive.EntryFilter() {
+				.getFilteredArchive(new Archive.EntryRenameFilter() {
 					@Override
 					public String apply(String entryName, Entry entry) {
 						if (entryName.equals("1.dat")) {

spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/archive/JarFileArchiveTests.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.loader;
+package org.springframework.boot.loader.archive;
 
 import java.io.File;
 import java.net.URL;
@@ -25,9 +25,10 @@ import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.TemporaryFolder;
-import org.springframework.boot.loader.Archive;
+import org.springframework.boot.loader.TestJarCreator;
-import org.springframework.boot.loader.JarFileArchive;
+import org.springframework.boot.loader.archive.Archive;
-import org.springframework.boot.loader.Archive.Entry;
+import org.springframework.boot.loader.archive.JarFileArchive;
+import org.springframework.boot.loader.archive.Archive.Entry;
 
 import static org.hamcrest.Matchers.equalTo;
 import static org.junit.Assert.assertThat;
@@ -83,7 +84,7 @@ public class JarFileArchiveTests {
 	@Test
 	public void getFilteredArchive() throws Exception {
 		Archive filteredArchive = this.archive
-				.getFilteredArchive(new Archive.EntryFilter() {
+				.getFilteredArchive(new Archive.EntryRenameFilter() {
 					@Override
 					public String apply(String entryName, Entry entry) {
 						if (entryName.equals("1.dat")) {