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Author: [log in to unmask]
Date: Thu Jan 15 17:32:50 2015
New Revision: 1944

Log:
Add utility class for getting the list of available steering resource files.

Added:
    java/trunk/steering-files/src/main/java/
    java/trunk/steering-files/src/main/java/org/
    java/trunk/steering-files/src/main/java/org/hps/
    java/trunk/steering-files/src/main/java/org/hps/steering/
    java/trunk/steering-files/src/main/java/org/hps/steering/SteeringFileCatalog.java

Added: java/trunk/steering-files/src/main/java/org/hps/steering/SteeringFileCatalog.java
 =============================================================================
--- java/trunk/steering-files/src/main/java/org/hps/steering/SteeringFileCatalog.java	(added)
+++ java/trunk/steering-files/src/main/java/org/hps/steering/SteeringFileCatalog.java	Thu Jan 15 17:32:50 2015
@@ -0,0 +1,60 @@
+package org.hps.steering;
+
+import java.io.IOException;
+import java.net.JarURLConnection;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.Enumeration;
+import java.util.List;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+
+/**
+ * This is a static utility class for getting the list of steering file resources. 
+ * 
+ * @author Jeremy McCormick <[log in to unmask]>
+ */
+public final class SteeringFileCatalog {
+    
+    private SteeringFileCatalog() {        
+    }
+    
+    /**
+     * Find the list of steering files in the standard resource directory.     
+     * @return The list of steering files.
+     */
+    public static List<String> find() {
+        return find("org/hps/steering");
+    }
+    
+    /**
+     * Find a list of steering files with the given resource directory.
+     * @param resourceDirectory The resource directory.
+     * @return The list of matching steering files.
+     */
+    public static List<String> find(String resourceDirectory) {        
+        List<String> resources = new ArrayList<String>();              
+        URL url = SteeringFileCatalog.class.getResource("SteeringFileCatalog.class");        
+        String scheme = url.getProtocol();
+        if (!"jar".equals(scheme)) {
+            throw new IllegalArgumentException("Unsupported URL protocol: " + url.getProtocol());
+        }
+        try {
+            JarURLConnection con = (JarURLConnection) url.openConnection();
+            JarFile archive = con.getJarFile();
+            Enumeration<JarEntry> entries = archive.entries();
+            while (entries.hasMoreElements()) {
+                JarEntry entry = entries.nextElement();                
+                if (entry.getName().endsWith(".lcsim") && 
+                        (resourceDirectory == null || resourceDirectory.length() == 0 || entry.getName().contains(resourceDirectory))) {
+                    // Accept the file if it ends with .lcsim and the resource directory matches or is not set (e.g. null or zero length string).
+                    resources.add("/" + entry.getName());
+                }
+            }
+            archive.close();
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+        return resources;
+    }  
+}