Added WizardPathValidator interface and service provider lookup

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

@@ -38,6 +38,7 @@ import javax.swing.event.DocumentEvent;
 import org.openide.util.Lookup;
 import org.openide.util.NbBundle;
 import org.sleuthkit.autopsy.corecomponentinterfaces.DataSourceProcessor;
+import org.sleuthkit.autopsy.corecomponentinterfaces.WizardPathValidator;
 import org.sleuthkit.autopsy.coreutils.Logger;
 
 /**
@@ -55,6 +56,8 @@ final class AddImageWizardChooseDataSourceVisual extends JPanel {
 
     private Map<String, DataSourceProcessor> datasourceProcessorsMap = new HashMap<>();
 
+    List<WizardPathValidator> pathValidatorList = new ArrayList<>();
+    
     List<String> coreDSPTypes = new ArrayList<>();
 
     /**
@@ -75,6 +78,8 @@ final class AddImageWizardChooseDataSourceVisual extends JPanel {
         typePanel.setLayout(new BorderLayout());
 
         discoverDataSourceProcessors();
+        
+        discoverWizardPathValidators();
 
         // set up the DSP type combobox
         typeComboBox.removeAllItems();
@@ -128,6 +133,12 @@ final class AddImageWizardChooseDataSourceVisual extends JPanel {
             }
         }
     }
+    
+    private void discoverWizardPathValidators() {
+        for (WizardPathValidator pathValidator : Lookup.getDefault().lookupAll(WizardPathValidator.class)) {
+            pathValidatorList.add(pathValidator);
+        }
+    }    
 
     private void dspSelectionChanged() {
         // update the current panel to selection

Core/src/org/sleuthkit/autopsy/corecomponentinterfaces/WizardPathValidator.java

@@ -0,0 +1,52 @@
+/*
+ * Autopsy Forensic Browser
+ *
+ * Copyright 2011-2014 Basis Technology Corp.
+ * Contact: carrier <at> sleuthkit <dot> org
+ *
+ * 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.sleuthkit.autopsy.corecomponentinterfaces;
+
+/*
+ * Defines an interface used by the Add DataSource wizard to validate path for selected
+ * case and/or data source. 
+ * 
+ * Different Autopsy implementations and modes may have its unique attributes and 
+ * may need to be processed differently.
+ * 
+ * The WizardPathValidator interface defines a uniform mechanism for the Autopsy UI
+ * to:
+ *  - Validate path for selected case.
+ *  - Validate path for selected data source.
+ */
+public interface WizardPathValidator {
+
+    /**
+     * Validates case path.
+     *
+     * @param path Absolute path to case file.
+     * @return String Error message if path is invalid, empty string otherwise.
+     *
+     */
+    String validateCasePath(String path);
+
+    /**
+     * Validates data source path.
+     *
+     * @param path Absolute path to data source file.
+     * @return String Error message if path is invalid, empty string otherwise.
+     *
+     */
+    String validateDataSourcePath(String path);
+}