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Amol/Proteus_Lib_Jar/Framework6M/DocumentViewerServiceUtility.java

+package ibase.webitm.utility;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.rmi.RemoteException;
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.Statement;
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.xml.parsers.DocumentBuilderFactory;
+
+import ibase.system.config.ConnDriver;
+import ibase.utility.BaseLogger;
+import ibase.utility.UserInfoBean;
+import org.json.JSONArray;
+import org.json.JSONObject;
+import org.json.JSONException;
+import java.io.StringReader;
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.ParserConfigurationException;
+import org.xml.sax.SAXException;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+import org.xml.sax.InputSource;
+
+
+public class DocumentViewerServiceUtility extends RestAPIServiceUtility {
+
+	/*
+	 * Params: objName refID This will contain logic to first get doc ID's against
+	 * the objName and refID via getDocumentData's method
+	 * 
+	 */
+	public byte[] getPreviewImage(String objName, String refId, String tokenIDfromHeader) {
+		BaseLogger.log("3", null, null, " getPreviewImage method call: ");
+
+		UserInfoBean userInfo = null;
+
+		if (userInfo == null)
+		{
+			APIUtility apiUtility = new APIUtility();
+			userInfo = apiUtility.createUserInfoFromJWTToken(tokenIDfromHeader);
+			BaseLogger.log("3", null, null, "USER_INFO created from TOKEN: [" + userInfo + "]");
+		}
+
+		DocumentHandlerServiceUtility documentHandlerServiceUtility = new DocumentHandlerServiceUtility();
+		String responseData = null;
+		String refCol = "";
+		String dataFormat = "xml";
+		byte[] byteArray = null; 
+		try {
+			
+			responseData = new String(documentHandlerServiceUtility.documentGetData(objName, refId, refCol, dataFormat, tokenIDfromHeader));
+			BaseLogger.log("3", null, null, "responseData ==> " + responseData);
+
+			List<String> docIds = new ArrayList<>();
+
+			try {
+			    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
+			    DocumentBuilder builder = factory.newDocumentBuilder();
+			    InputSource is = new InputSource(new StringReader(responseData));
+			    Document doc = builder.parse(is);
+			    NodeList docIdNodes = doc.getElementsByTagName("Document_Id");
+			    // Extract Document_Id values
+			    for (int i = 0; i < docIdNodes.getLength(); i++) 
+			    {
+			        Node docIdNode = docIdNodes.item(i);
+			        if (docIdNode.getNodeType() == Node.ELEMENT_NODE) {
+			            Element docIdElement = (Element) docIdNode;
+			            String docId = docIdElement.getTextContent();
+			            docIds.add(docId);
+			            BaseLogger.log("3", null, null, "DocumentViewerServlet docIDs : [" + docIds + "]");
+			        }
+			    }
+			} 
+			catch (ParserConfigurationException | SAXException | IOException e) 
+			{
+			    BaseLogger.log("3", null, null, "Error parsing XML response: " + e.getMessage());
+			    e.printStackTrace();
+			}
+
+			for (String docId : docIds) {
+				try {
+					BaseLogger.log("3", null, null, "DocumentViewerServlet :: docID [" + docId + "]");
+					byteArray = getPreviewImageAgainstDocId(docId, userInfo);
+				} catch (Exception ex) {
+					BaseLogger.log("3", null, null, "Exception in DocumentViewerServlet :: handleDocument() : " + ex);
+					ex.printStackTrace();
+				}
+			}
+		} catch (Exception e) {
+			BaseLogger.log("3", null, null, "Exception :: " + e);
+
+			e.printStackTrace();
+		}
+
+		return byteArray;
+	}
+
+	private byte[] getPreviewImageAgainstDocId(String docId, UserInfoBean userInfo) {
+		BaseLogger.log("3", null, null, "getPreviewImageAgainstDocId Service Called");
+
+		byte[] byteArray = null;
+
+		try {
+			BaseLogger.log("3", null, null,
+					"DocumentViewerServlet :: handleDocument() : GET_VIDEO_FRAME : docID [" + docId + "]");
+
+			if (docId == null || "".equals(docId.trim()))
+				byteArray = new byte[] { 0 };
+			else {
+				byteArray = getVideoFrame(docId, userInfo);
+				byteArray = (byteArray == null) ? new byte[] { 0 } : byteArray;
+			}
+		} catch (Exception ex) {
+			BaseLogger.log("3", null, null, "Exception in DocumentViewerServlet :: handleDocument() : " + ex);
+			ex.printStackTrace();
+		}
+		BaseLogger.log("3", null, null, "byteArray:: " + byteArray);
+
+		return byteArray;
+	}
+
+	// getPreviewImageAgainstDocId(List docId's)
+	private byte[] getVideoFrame(String docId, UserInfoBean userInfo) {
+		BaseLogger.log("3", null, null, "getVideoFrame() Called");
+
+		Connection conn = null;
+		Statement st = null;
+		ResultSet rs = null;
+		InputStream inputStream = null;
+		byte[] iconByteArray = { 0 };
+		BaseLogger.log("3", null, null, " getVideoFrame method call: ");
+
+		try {
+			String sql = "SELECT ICON FROM DOC_CONTENTS WHERE DOC_ID = " + docId;
+			BaseLogger.log("3", userInfo, null, "DocumentViewerServlet :: getVideoFrame() : sql [" + sql + "]");
+			String transDB = userInfo.getTransDB();
+			conn = new ConnDriver().getConnectDB(transDB);
+			st = conn.createStatement();
+
+			rs = st.executeQuery(sql);
+
+			if (rs.next()) {
+				inputStream = rs.getBinaryStream(1);
+
+				if (inputStream != null) {
+					ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+					int i = 0;
+
+					while ((i = inputStream.read()) != -1)
+						byteArrayOutputStream.write(i);
+
+					iconByteArray = byteArrayOutputStream.toByteArray();
+				}
+			}
+		} catch (Exception ex) {
+			BaseLogger.log("3", userInfo, null, "Exception in DocumentViewerServlet :: getVideoFrame() : " + ex);
+		} finally {
+			try {
+				if (conn != null)
+					conn.close();
+				if (st != null)
+					st.close();
+				if (rs != null)
+					rs.close();
+			} catch (Exception ex) {
+			}
+		}
+
+		return iconByteArray;
+	}
+}