5979 populate document preview for file discovery

Core/src/org/sleuthkit/autopsy/filequery/DocumentPanel.form

@@ -124,6 +124,9 @@
       </Properties>
     </Component>
     <Container class="javax.swing.JScrollPane" name="previewScrollPane">
+      <Properties>
+        <Property name="verticalScrollBarPolicy" type="int" value="21"/>
+      </Properties>
       <AuxValues>
         <AuxValue name="autoScrollPane" type="java.lang.Boolean" value="true"/>
       </AuxValues>
@@ -135,10 +138,13 @@
             <Property name="editable" type="boolean" value="false"/>
             <Property name="columns" type="int" value="20"/>
             <Property name="lineWrap" type="boolean" value="true"/>
-            <Property name="rows" type="int" value="4"/>
+            <Property name="rows" type="int" value="5"/>
             <Property name="wrapStyleWord" type="boolean" value="true"/>
             <Property name="enabled" type="boolean" value="false"/>
             <Property name="focusable" type="boolean" value="false"/>
+            <Property name="maximumSize" type="java.awt.Dimension" editor="org.netbeans.beaninfo.editors.DimensionEditor">
+              <Dimension value="[164, 94]"/>
+            </Property>
           </Properties>
         </Component>
       </SubComponents>

Core/src/org/sleuthkit/autopsy/filequery/DocumentPanel.java

@@ -89,13 +89,16 @@ public class DocumentPanel extends javax.swing.JPanel implements ListCellRendere
 
         org.openide.awt.Mnemonics.setLocalizedText(documentType, org.openide.util.NbBundle.getMessage(DocumentPanel.class, "DocumentPanel.documentType.text")); // NOI18N
 
+        previewScrollPane.setVerticalScrollBarPolicy(javax.swing.ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER);
+
         previewTextArea.setEditable(false);
         previewTextArea.setColumns(20);
         previewTextArea.setLineWrap(true);
-        previewTextArea.setRows(4);
+        previewTextArea.setRows(5);
         previewTextArea.setWrapStyleWord(true);
         previewTextArea.setEnabled(false);
         previewTextArea.setFocusable(false);
+        previewTextArea.setMaximumSize(new java.awt.Dimension(164, 94));
         previewScrollPane.setViewportView(previewTextArea);
 
         javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
@@ -192,8 +195,9 @@ public class DocumentPanel extends javax.swing.JPanel implements ListCellRendere
     public Component getListCellRendererComponent(JList<? extends DocumentWrapper> list, DocumentWrapper value, int index, boolean isSelected, boolean cellHasFocus) {
         fileSizeLabel.setText(getFileSizeString(value.getResultFile().getFirstInstance().getSize()));
         countLabel.setText(Bundle.ImageThumbnailPanel_countLabel_text(value.getResultFile().getAllInstances().size()));
-        documentType.setText(value.getResultFile().getFileType().name()); //WJS-TODO fill this in with a document type instead of just DOCUMENT
+        documentType.setText("Extension: " + value.getResultFile().getFirstInstance().getNameExtension());  //WJS-TODO fill this in with a document type instead of just DOCUMENT
         previewTextArea.setText(value.getPreview());
+        previewTextArea.setCaretPosition(0);
         if (value.getResultFile().isDeleted()) {
             isDeletedLabel.setIcon(DELETED_ICON);
             isDeletedLabel.setToolTipText(Bundle.ImageThumbnailPanel_isDeleted_text());

Core/src/org/sleuthkit/autopsy/filequery/DocumentWrapper.java

@@ -18,10 +18,20 @@
  */
 package org.sleuthkit.autopsy.filequery;
 
+import java.util.logging.Level;
+import org.sleuthkit.datamodel.AbstractFile;
+import org.apache.commons.lang3.StringUtils;
+import org.sleuthkit.autopsy.coreutils.Logger;
+import org.sleuthkit.autopsy.coreutils.StringExtract;
+import org.sleuthkit.datamodel.TskCoreException;
 
 public class DocumentWrapper {
+
     private String preview;
     private final ResultFile resultFile;
+    private static final Logger logger = Logger.getLogger(DocumentWrapper.class.getName());
+        //string extract utility
+    private final StringExtract stringExtract = new StringExtract();
 
     /**
      * Construct a new ImageThumbnailsWrapper.
@@ -30,10 +40,36 @@ public class DocumentWrapper {
      *             summary is created for.
      */
     DocumentWrapper(ResultFile file) {
-        this.preview = "Preview not currently available";
+        this.preview = createPreview(file.getFirstInstance());
         this.resultFile = file;
     }
 
+    private String createPreview(AbstractFile file) {
+        byte[] data = new byte[256];
+        int bytesRead = 0;
+        if (file.getSize() > 0) {
+            try {
+                bytesRead = file.read(data, 0, 256); // read the data
+            } catch (TskCoreException ex) {
+                logger.log(Level.WARNING, "Error while trying to show the String content.", ex); //NON-NLS
+            }
+        }
+        String text;
+        if (bytesRead > 0) {
+            //text = DataConversion.getString(data, bytesRead, 4);
+            final StringExtract.StringExtractUnicodeTable.SCRIPT selScript = StringExtract.StringExtractUnicodeTable.SCRIPT.LATIN_1;
+            stringExtract.setEnabledScript(selScript);
+            StringExtract.StringExtractResult res = stringExtract.extract(data, bytesRead, 0);
+            text = res.getText();
+            if (StringUtils.isBlank(text)) {
+                text = "No Preview available.";
+            }
+        } else {
+            text = "No bytes read for preview.";
+        }
+        return text;
+    }
+
     /**
      * Set the preview summary which exists.
      *
@@ -44,8 +80,8 @@ public class DocumentWrapper {
     }
 
     /**
-     * Get the ResultFile which represents the document the preview summary
+     * Get the ResultFile which represents the document the preview summary was
-     * was created for.
+     * created for.
      *
      * @return The ResultFile which represents the image file which the
      *         thumbnail was created for.