More changes to teh way ExplodedArchive works in non-recursive mode

It is sufficient for most purposes (e.g. the ones PropertieLauncher needs)
to only read the META-INF directory (not the whole file tree). So a quick
fix is to make META-INF a special case when initializing non-recursive
entries.

Fixes gh-520

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

@@ -410,7 +410,7 @@ public class PropertiesLauncher extends Launcher {
 
 		try {
 			// Prefer home dir for MANIFEST if there is one
-			Manifest manifest = new ExplodedArchive(this.home).getManifest();
+			Manifest manifest = new ExplodedArchive(this.home, false).getManifest();
 			if (manifest != null) {
 				String value = manifest.getMainAttributes().getValue(manifestKey);
 				this.logger.fine("Property '" + manifestKey

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

@@ -91,7 +91,8 @@ public class ExplodedArchive extends Archive {
 			}
 			for (File child : files) {
 				if (!SKIPPED_NAMES.contains(child.getName())) {
-					if (file.equals(this.root) || this.recursive) {
+					if (file.equals(this.root) || this.recursive
+							|| file.getName().equals("META-INF")) {
 						buildEntries(child);
 					}
 				}

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

@@ -22,7 +22,9 @@ import java.util.Map;
 
 import org.junit.Test;
 
+import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.greaterThan;
+import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertThat;
 
 /**
@@ -37,6 +39,23 @@ public class SpecialArchiveTests {
 		assertThat(entries.size(), greaterThan(1));
 	}
 
+	@Test
+	public void getManifest() throws Exception {
+		ExplodedArchive archive = new ExplodedArchive(new File("src/test/resources/root"));
+		assertNotNull(archive.getManifest());
+		Map<String, Archive.Entry> entries = getEntriesMap(archive);
+		assertThat(entries.size(), equalTo(4));
+	}
+
+	@Test
+	public void getManifestEvenIfNonRecursive() throws Exception {
+		ExplodedArchive archive = new ExplodedArchive(
+				new File("src/test/resources/root"), false);
+		assertNotNull(archive.getManifest());
+		Map<String, Archive.Entry> entries = getEntriesMap(archive);
+		assertThat(entries.size(), equalTo(3));
+	}
+
 	private Map<String, Archive.Entry> getEntriesMap(Archive archive) {
 		Map<String, Archive.Entry> entries = new HashMap<String, Archive.Entry>();
 		for (Archive.Entry entry : archive.getEntries()) {

spring-boot-tools/spring-boot-loader/src/test/resources/root/META-INF/spring/application.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
+
+
+</beans>