Updated Services and FileManager to implement the java.io.Closeable

interface and updated FileManager to throw TskCoreException when its API is
used after it has been closed.  Closing is propagated to all services when
the Case object is closed. These changes are in support of AUT-613.

Core/src/org/sleuthkit/autopsy/casemodule/Case.java

@@ -360,6 +360,7 @@ public class Case {
         try {
             this.xmlcm.close(); // close the xmlcm
             this.db.close();
+            services.close();
         } catch (Exception e) {
             throw new CaseActionException("Error while trying to close the current case.", e);
         }

Core/src/org/sleuthkit/autopsy/casemodule/services/FileManager.java

@@ -4,6 +4,9 @@
  */
 package org.sleuthkit.autopsy.casemodule.services;
 
+import java.io.Closeable;
+import java.io.IOException;
+import java.util.Collections;
 import java.util.List;
 import org.sleuthkit.datamodel.FsContent;
 import org.sleuthkit.datamodel.SleuthkitCase;
@@ -12,7 +15,7 @@ import org.sleuthkit.datamodel.TskCoreException;
 /**
  * Abstraction to facilitate access to files and directories.
  */
-public class FileManager {
+public class FileManager implements Closeable {
 	
 	private SleuthkitCase tskCase;
 
@@ -26,7 +29,10 @@ public class FileManager {
 	 * given fileName
 	 */
 	public List<FsContent> findFiles(String fileName) throws TskCoreException {
-		return tskCase.findFiles(fileName);
+            if (tskCase == null) {
+                throw new TskCoreException("Attemtped to use FileManager after it was closed.");
+            }
+            return tskCase.findFiles(fileName);
 	}
 	
 	/**
@@ -36,7 +42,10 @@ public class FileManager {
 	 * fileName and whose parent directory contains dirName.
 	 */
 	public List<FsContent> findFiles(String fileName, String dirName) throws TskCoreException {
-		return tskCase.findFiles(fileName, dirName);
+            if (tskCase == null) {
+                throw new TskCoreException("Attemtped to use FileManager after it was closed.");
+            }
+            return tskCase.findFiles(fileName, dirName);
 	}
 	
 	/**
@@ -46,7 +55,10 @@ public class FileManager {
 	 * fileName and that were inside a directory described by parentFsContent.
 	 */
 	public List<FsContent> findFiles(String fileName, FsContent parentFsContent) throws TskCoreException {
-		return findFiles(fileName, parentFsContent.getName());
+            if (tskCase == null) {
+                throw new TskCoreException("Attemtped to use FileManager after it was closed.");
+            }
+            return findFiles(fileName, parentFsContent.getName());
 	}
 	
 	/**
@@ -55,7 +67,15 @@ public class FileManager {
 	 * @return a list of FsContent that have the given file path.
 	 */
 	public List<FsContent> openFiles(String filePath) throws TskCoreException {
-		return tskCase.openFiles(filePath);
+            if (tskCase == null) {
+                throw new TskCoreException("Attemtped to use FileManager after it was closed.");
+            }
+            return tskCase.openFiles(filePath);
 	}
+
+    @Override
+    public void close() throws IOException {
+        tskCase = null;
+    }
 	
 }

Core/src/org/sleuthkit/autopsy/casemodule/services/Services.java

@@ -4,15 +4,25 @@
  */
 package org.sleuthkit.autopsy.casemodule.services;
 
+import java.io.Closeable;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
 import org.sleuthkit.datamodel.SleuthkitCase;
 
 /**
  *
  * @author mciver
  */
-public class Services {
+public class Services implements Closeable {
     
     private SleuthkitCase tskCase;
+    
+    // NOTE: all new services added to Services class must be added to this list
+    // of services.
+    List<Closeable> services = new ArrayList<Closeable>();
+    
+    // services
     private FileManager fileManager;
 
     public Services(SleuthkitCase tskCase) {
@@ -22,7 +32,16 @@ public class Services {
     public FileManager getFileManager() {
         if (fileManager == null) {
             fileManager = new FileManager(tskCase);
+            services.add(fileManager);
         }
         return fileManager;
     }
+
+    @Override
+    public void close() throws IOException {
+        // close all services
+        for (Closeable service : services) {
+            service.close();
+        }
+    }
 }