Merged in clint-capletnode (pull request #413)

Moved the Corda Caplet to Node to clear out root src dir.

node/build.gradle

@@ -134,6 +134,9 @@ dependencies {
     compile "org.hibernate:hibernate-core:5.2.2.Final"
     compile "org.hibernate:hibernate-java8:5.2.2.Final"
 
+    // Capsule is a library for building independently executable fat JARs.
+    compile 'co.paralleluniverse:capsule:1.0.3'
+
     // Integration test helpers
     integrationTestCompile 'junit:junit:4.12'
 

node/src/main/java/CordaCaplet.java

@@ -0,0 +1,54 @@
+// Due to Capsule being in the default package, which cannot be imported, this caplet
+// must also be in the default package. When using Kotlin there are a whole host of exceptions
+// trying to construct this from Capsule, so it is written in Java.
+
+import org.apache.commons.io.FilenameUtils;
+
+import java.io.File;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.Map;
+
+public class CordaCaplet extends Capsule {
+
+    protected CordaCaplet(Capsule pred) {
+        super(pred);
+    }
+
+    /**
+     * Overriding the Caplet classpath generation via the intended interface in Capsule.
+     */
+    @Override
+    @SuppressWarnings("unchecked")
+    protected <T> T attribute(Map.Entry<String, T> attr) {
+        // Equality is used here because Capsule never instantiates these attributes but instead reuses the ones
+        // defined as public static final fields on the Capsule class, therefore referential equality is safe.
+        if(ATTR_APP_CLASS_PATH == attr) {
+            T cp = super.attribute(attr);
+            List<Path> classpath = augmentClasspath((List<Path>) cp, "plugins");
+            return (T) augmentClasspath(classpath, "dependencies");
+        }
+        return super.attribute(attr);
+    }
+
+    // TODO: Make directory configurable via the capsule manifest.
+    // TODO: Add working directory variable to capsules string replacement variables.
+    private List<Path> augmentClasspath(List<Path> classpath, String dirName) {
+        File dir = new File("plugins");
+        if(!dir.exists()) {
+            dir.mkdir();
+        }
+
+        File[] files = dir.listFiles();
+        for (File file : files) {
+            if (file.isFile() && isJAR(file)) {
+                classpath.add(file.toPath().toAbsolutePath());
+            }
+        }
+        return classpath;
+    }
+
+    private Boolean isJAR(File file) {
+        return file.getName().toLowerCase().endsWith(".jar");
+    }
+}