New class PrinterLogicalHelper replacing PrinterHelper
authorgumartinm <gu.martinm@gmail.com>
Sat, 14 Jan 2012 13:52:05 +0000 (14:52 +0100)
committergumartinm <gu.martinm@gmail.com>
Sat, 14 Jan 2012 13:52:05 +0000 (14:52 +0100)
Allgemeines/PrinterHelper/src/printer/helper/PrinterHelper.java [deleted file]
Allgemeines/PrinterHelper/src/printer/helper/PrinterLogicalHelper.java [new file with mode: 0755]

diff --git a/Allgemeines/PrinterHelper/src/printer/helper/PrinterHelper.java b/Allgemeines/PrinterHelper/src/printer/helper/PrinterHelper.java
deleted file mode 100644 (file)
index 6e085ca..0000000
+++ /dev/null
@@ -1,349 +0,0 @@
-/**
- * 
- */
-package printer.helper;
-
-import java.io.BufferedReader;
-import java.io.ByteArrayOutputStream;
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileNotFoundException;
-import java.io.FileOutputStream;
-import java.io.FilenameFilter;
-import java.io.IOException;
-import java.io.InputStreamReader;
-import java.io.OutputStream;
-import java.io.PrintStream;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.ListIterator;
-
-
-/**
- * <p>
- *  First of all some thoughts:
- * </p>
- * <p>
- *  The device wrapper classes lack methods to change themselves the device configuration. 
- * These methods can be found in the Logical layer, so this layer is device-dependent
- * (it just will work with JavaPOS devices)
- * Actually we have two options in order to write specific methods related to the device
- * configuration. We can add these methods to the Logical layer or create a new Helper Class 
- * for them but... What about if we need to add device specific methods? The Logical layer is right
- * now JavaPOS dependent (although it was intended to be a device abstraction...) if we add 
- * device specific methods such as methods related to a specific kind of Printer, the Logical
- * layer will be useless and the code will be a mess (if some day a device is changed we will 
- * have to search the whole code to find out what code is related with that device and 
- * we will have to create new classes in the Logical layer for every device ) 
- * </p>
- * <p>
- *      So this Helper is intended to store methods which do not fit into the Logical layer because
- * they make this layer not just JPOS dependent but completely device-dependent. All of this because
- * of the wrapper classes lack the required methods for these kinds of operations.
- * </p>
- * <p>
- *  To sum up, before adding in this class new methods you should ask yourself two questions:
- * <ul>
- * <li>1. Is your method device independent? If the answer is yes, without doubt write your method in
- * the Logical layer. If the answer is no you have to ask yourself a second question.</li>
- * <br>
- * <li>2. Is this method device or JavaPOS dependent? If the answer is JavaPOS-dependent write 
- * your new method in the Logical layer and if it is device-dependent use this class for them.</li>
- * </ul>
- * </p>
- * <p>
- * Instances of this class are mutable. To use them concurrently, clients must surround each
- * method invocation (or invocation sequence) with external synchronization of the clients' choosing.
- * </p>
- */
-public final class PrinterHelper {
-       private static final Logger logger = Logger.getLogger(PrinterHelper.class);
-       private static final String HOME_ENV_KEY = "HOME";
-       private static final String FORM_PROPERTIES_FILE_RELATIVE_PATH = "etc/"+ FormConfiguration.PROPERTIES_FILE;
-       private static final String TEMPLATE_FILE_EXTENSION = ".frm";
-       private static final String PRINTER_PROPERTY = "MethodToPrintImage";
-       private static final String PRINTER_PROPERTY_VALUE = "ESC/POS";
-       
-        // Prevents instantiation from other classes. Why do you want to extend this class?
-    private PrinterHelper() { }
-
-       
-    /**
-        * This method must try and fetch the model of the currently connected form printer (physically)
-        * on the given port
-        * 
-        * @param      formPrinterPort the printer port.
-        * @return     the model printer as a {@code FormPrinterModel enum} class
-     *             The first <code>char</code> value is at index <code>0</code>.
-        */
-       public static FormPrinterModel autoDetetectFormPrinterModel(final Port formPrinterPort) 
-       {
-               FormPrinterModel formPrinterModelDetected = null;
-               
-               final File scriptAutoDetect = new File(System.getProperty(HOME_ENV_KEY),"tools/detectatm88.sh");
-               if (scriptAutoDetect.exists() && scriptAutoDetect.canExecute()){
-
-
-                       final ByteArrayOutputStream baos = new ByteArrayOutputStream();
-                       final PrintStream output = new PrintStream(baos);
-
-                       final String command = "sh " + scriptAutoDetect.getAbsolutePath() +     " "  + formPrinterPort.getPhysicalPath();
-                       try {
-                               int result;
-
-                               //result field stores exit status of the executed command
-                               result = LauncherProcesses.exec(command,output);
-
-                               if(result==0)
-                               {
-                                       logger.debug("detectatm88 raw output: "+baos.toString());
-                                       //From detectatm88.sh script we receive a string like this one: "RESULT: 2"
-                                       //we must split the String and retrieve the integer value
-                                       final String[] parameters = baos.toString().split(" ");
-                                       final int model = Integer.parseInt(parameters[1].trim());
-                                       switch(model){
-                                       case 0:
-                                               logger.warn("TM88 not physically detected: run again detectatm88.sh script");
-                                               formPrinterModelDetected = null;
-                                               break;
-                                       case 2:
-                                               logger.info("TM-T88II detected");
-                                               formPrinterModelDetected = FormPrinterModel.EPSON_TM_88_II_III;
-                                               PrinterHelper.addFormPrinterProperty(PRINTER_PROPERTY, PRINTER_PROPERTY_VALUE);
-                                               break;
-                                       case 3:
-                                               logger.info("TM-T88III detected");
-                                               formPrinterModelDetected = FormPrinterModel.EPSON_TM_88_II_III;
-                                               PrinterHelper.addFormPrinterProperty(PRINTER_PROPERTY, PRINTER_PROPERTY_VALUE);
-                                               break;
-                                       case 4:
-                                               logger.info("TM-T88IV detected");
-                                               formPrinterModelDetected = FormPrinterModel.EPSON_TM_88_IV;
-                                               PrinterHelper.addFormPrinterProperty(PRINTER_PROPERTY, PRINTER_PROPERTY_VALUE);
-                                               break;
-                                       case 5:
-                                               logger.info("TM-T88V detected");
-                                               formPrinterModelDetected = FormPrinterModel.EPSON_TM_88_V;
-                                               PrinterHelper.removeFormPrinterProperty(PRINTER_PROPERTY);
-                                               break;
-                                       default:
-                                               logger.warn("Code retrieved from detectatm88.sh script does not match.");
-                                               formPrinterModelDetected = null;
-                                               break;
-                                       }               
-                               }
-                               //model not detected
-                               else{
-                                       logger.warn("TM88 not physically detected. Not conected printer or it is not a TM-T88");
-                               }
-                       } catch (Exception e) {
-                               logger.error(e);
-                       } 
-               }
-               else {
-                       logger.warn("Script for tm88 detection not found or not exectuable");
-               }
-
-               return formPrinterModelDetected;
-       }
-
-       /**
-        * This method is intended to add new properties in DtgFormToPrint.properties file used by TM88 printers.
-        * 
-        * @param  property  the property to be added
-        * @param  value     value of property param. Possible values:
-        *                                       <br>
-        *                                       <ul>
-        *                                       <li>printBitmap</li>
-        *                                       <li>printMemoryBitmap</li>
-        *                                       <li>setBitmap</li>
-        *                                       <li>ESC/POS</li>
-        *                                       </ul>
-        * @throws FileNotFoundException 
-        *                 If the file called DtgFormToPrint.properties
-        *         is not found.
-        */
-       public static void addFormPrinterProperty(final String property, final String value) throws FileNotFoundException
-       {
-               //If the property does not exist we do not have to remove it
-               if (FormConfiguration.getConfiguration().getSection().get(property) == null)
-               {
-                       FormConfiguration.getConfiguration().getSection().add(property,value);
-                       OutputStream formConfigurationFile;
-                       formConfigurationFile = new FileOutputStream
-                                       (new File(System.getProperty(HOME_ENV_KEY),FORM_PROPERTIES_FILE_RELATIVE_PATH));
-                       FormConfiguration.getConfiguration().save(formConfigurationFile);
-               }
-       }
-       
-       /**
-        * This method is intended to remove properties in DtgFormToPrint.properties file used by TM88 printers.
-        * 
-        * @param  property property to be removed
-        * @throws FileNotFoundException 
-        *                 If the file called DtgFormToPrint.properties
-        *         is not found.
-        */
-       public static void removeFormPrinterProperty(final String property) throws FileNotFoundException
-       {
-               FormConfiguration.getConfiguration().getSection().remove(property);
-               OutputStream formConfigurationFile;
-               formConfigurationFile = new FileOutputStream
-                               (new File(System.getProperty(HOME_ENV_KEY),FORM_PROPERTIES_FILE_RELATIVE_PATH));
-               FormConfiguration.getConfiguration().save(formConfigurationFile);
-
-       }
-       
-       /**
-        * This method returns a {@code List<File>} with the found files.
-        * 
-        * @param  extension the file extension name
-        * @return the found files
-        */
-       public static List<File> findFilebyExtension(final String extension)
-       {
-               final File dir = ConfigurationHelper.getInstance().getFormsFolder();
-               
-               final FilenameFilter filter = new FilenameFilter() {
-                   public boolean accept(final File dir, final String name) {
-                       return name.endsWith(extension);
-                   }
-               };
-               List<File> filesList = new ArrayList<File>();
-
-               for (File file : dir.listFiles(filter))
-               {
-                   filesList.add(file);
-               }
-               
-               return filesList;
-       }
-       
-       /**
-        * Read file line by line and stores the lines in a {@code List<String>}
-        * 
-        * @param file
-        * @param charset the file charset
-        * @return the file lines in a list
-        * @throws IOException
-        *                 If an I/O error occurs while reading or trying to open the file
-        */
-       public static List<String> readFile (final File file, final String charset) throws IOException
-       {
-               final BufferedReader bufferReader = new BufferedReader(new InputStreamReader
-                               (new FileInputStream(file), charset));
-               
-               List<String> contents = new ArrayList<String>();
-               String currentLine = null;
-               
-               try {
-                       currentLine = bufferReader.readLine();
-                       while (currentLine != null)
-                       {
-                               contents.add(currentLine);
-                               currentLine = bufferReader.readLine();
-                       }
-               } finally {
-                       bufferReader.close();
-               }
-
-               return contents;
-               
-       }
-       
-       /**
-        * Write lines to a file.
-        * 
-        * @param contents the lines to be written in a {@code List<String>}
-        * @param charset the file charset
-        * @param fileName the file name. Absolute or abstract pathname, it is your choice
-        * @throws IOException
-        *                 If an I/O error occurs while writing or trying to open the file
-        */
-       public static void writeFile (final List<String> contents, final String fileName, final String charset) throws IOException
-       {
-               final OutputStream outputStream = new FileOutputStream(fileName);
-               final PrintStream output = new PrintStream(outputStream, true, charset);
-               
-               try {
-                       for (String line : contents )
-                       {
-                               output.println(line);
-                       }
-               }
-               finally {
-                    output.close();
-               }
-       }
-       
-       /**
-        * Replace every line (file lines stored in a {@code List<String>})  
-        * with the lineReplacement if the line contains the pattern
-        * 
-        * @param contents the lines to be searched in a {@code List<String>}
-        * @param pattern the pattern to match in a line
-        * @param lineReplacement the whole line to replace in case of some match
-        * @return <b>true</b> if there is a match, otherwise <b>false</b>
-        */
-       public static boolean replaceLine (final List<String> contents, final String pattern, final String lineReplacement)
-       {
-               final ListIterator<String> itr = contents.listIterator();
-               boolean change = false;
-               
-               while (itr.hasNext())
-               {
-                       if (itr.next().trim().contains(pattern)) {
-                   itr.set(lineReplacement);
-                   change = true;
-                       }
-               }
-               
-               return change;
-       }
-       
-       /**
-        * Method intended to be used by the Logical layer. Search the template files
-        * of the form printer, replace the lines in case of match and write on the hard disk the 
-        * new files.
-        * 
-        * @param pattern the pattern to match
-        * @param lineReplacement the whole line to replace in case of some match
-        * @throws IOException
-        *                 If an I/O error occurs while writing or trying to open a file
-        */
-       public static void searchandReplace (final String pattern, final String lineReplacement) throws IOException
-       {
-               final List<File> fileList = PrinterHelper.findFilebyExtension(TEMPLATE_FILE_EXTENSION);
-               for (File file : fileList)
-               {
-                       final List<String> contents = PrinterHelper.readFile(file, FormConfiguration.getCharset());
-                       if (PrinterHelper.replaceLine(contents, pattern, lineReplacement))
-                       {
-                               PrinterHelper.writeFile(contents, file.getAbsolutePath(), FormConfiguration.getCharset());
-                       }
-               }
-       }
-       
-       /**
-        *  Method intended to be used by the Logical layer. It is smart enough to find out
-        *  it there is a new form printer model
-        * 
-        * @param oldModel The previous form printer model
-        * @param newModel The new form printer model
-        * @throws IOException
-        *                 If an I/O error occurs while writing or trying to open a file
-        */
-       public static void changedPrinter (final HardwareModel oldModel, final HardwareModel newModel) throws IOException
-       {
-               if(FormPrinterModel.EPSON_TM_88_V.getXmlDescriptor().equals(newModel.getXmlDescriptor()))
-               {
-                       PrinterHelper.searchandReplace("methodToPrintImage(ESC/POS)", "         COMMENT      \"usePageMode(false)\"");
-                       PrinterHelper.removeFormPrinterProperty(PRINTER_PROPERTY);
-               }
-               else if (FormPrinterModel.EPSON_TM_88_V.getXmlDescriptor().equals(oldModel.getXmlDescriptor()))
-               {       
-                       PrinterHelper.searchandReplace("usePageMode(false)", "         COMMENT      \"usePageMode(false) methodToPrintImage(ESC/POS)\"");
-                       PrinterHelper.addFormPrinterProperty(PRINTER_PROPERTY, PRINTER_PROPERTY_VALUE);
-               }
-       }
-}
\ No newline at end of file
diff --git a/Allgemeines/PrinterHelper/src/printer/helper/PrinterLogicalHelper.java b/Allgemeines/PrinterHelper/src/printer/helper/PrinterLogicalHelper.java
new file mode 100755 (executable)
index 0000000..7d987d7
--- /dev/null
@@ -0,0 +1,430 @@
+package de.printer.helper;
+
+import java.io.BufferedReader;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.FilenameFilter;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.io.UnsupportedEncodingException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.ListIterator;
+import org.apache.log4j.Logger;
+
+
+/**
+ * <p>
+ *  First of all some thoughts:
+ * </p>
+ * <p>
+ *  The device wrapper classes lack methods for changing themselves the device configuration. 
+ * These methods can be found in the Logical layer, so this layer is device-dependent
+ * (it just will work with JavaPOS devices)
+ * Actually we have two options in order to write specific methods related to the device
+ * configuration. We can add these methods to the Logical layer or create a new Helper Class 
+ * for them but... What about if we need to add device specific methods? The Logical layer is right
+ * now JavaPOS dependent (although it was intended to be a device abstraction...) if we add 
+ * device specific methods such as methods related to a specific kind of Printer, the Logical
+ * layer will be useless and the code will be a mess (if some day a device is changed we will 
+ * have to search the whole code to find out what code is related with that device and 
+ * we will have to create new classes in the Logical layer for every device ) 
+ * </p>
+ * <p>
+ *      So this Helper is intended to store methods which do not fit into the Logical layer because
+ * they make this layer not just JPOS dependent but completely device-dependent. All of this because
+ * of the wrapper classes lack the required methods for these kinds of operations.
+ * </p>
+ * <p>
+ *  To sum up, before adding in this class new methods you should ask yourself two questions:
+ * <ul>
+ * <li>1. Is your method device independent? If the answer is yes, without doubt write your method in
+ * the Logical layer. If the answer is no you have to ask yourself a second question.</li>
+ * <br>
+ * <li>2. Is this method device or JavaPOS dependent? If the answer is JavaPOS-dependent write 
+ * your new method in the Logical layer and if it is device-dependent use this class for them.</li>
+ * </ul>
+ * </p>
+ * <p>
+ * Instances of this class are mutable. To use them concurrently, clients must surround each
+ * method invocation (or invocation sequence) with external synchronization of the clients choosing.
+ * </p>
+ */
+public class PrinterLogicalHelper {
+       private static final Logger logger = Logger.getLogger(PrinterLogicalHelper.class);
+       private static final String FORM_PROPERTIES_FILE_RELATIVE_PATH = "etc/"+ FormConfiguration.PROPERTIES_FILE;
+       private static final String HOME_ENV_KEY = "HOME";
+       private static final String TEMPLATE_FILE_EXTENSION = ".frm";
+       private static final String PRINTER_PROPERTY = "MethodToPrintImage";
+       private static final String PRINTER_PROPERTY_VALUE = "ESC/POS";
+       private static final String PATTERN_TO_TM88V = "methodToPrintImage(ESC/POS)";
+       private static final String PATTERN_FROM_TM88V = "usePageMode(false)";
+       private static final String LINE_REPLACEMENT_TO_TM88V = "         COMMENT      \"usePageMode(false)\"";
+       private static final String LINE_REPLACEMENT_FROM_TM88V = "         COMMENT      \"usePageMode(false) methodToPrintImage(ESC/POS)\"";
+       
+        // Prevents instantiation from other classes. Why do you want to extend this class?
+    private PrinterLogicalHelper() { }
+
+       
+    /**
+        * This method must try and fetch the model of the currently connected form printer (physically)
+        * on the given port
+        * 
+        * @param      formPrinterPort the printer port.
+        * @return     the model printer as a {@link FormPrinterModel} class
+        * 
+        */
+       public final static FormPrinterModel autoDetetectFormPrinterModel(final Port formPrinterPort) 
+       {
+               FormPrinterModel formPrinterModelDetected = null;
+               
+               final File scriptAutoDetect = new File(System.getProperty(HOME_ENV_KEY),"tools/detectatm88.sh");
+               if (scriptAutoDetect.exists() && scriptAutoDetect.canExecute()){
+
+
+                       final ByteArrayOutputStream baos = new ByteArrayOutputStream();
+                       final PrintStream output = new PrintStream(baos);
+
+                       final String command = "sh " + scriptAutoDetect.getAbsolutePath() +     " "  + formPrinterPort.getPhysicalPath();
+                       try {
+                               int result;
+
+                               //result field stores exit status of the executed command
+                               result = LauncherProcesses.exec(command,output);
+
+                               if(result==0)
+                               {
+                                       logger.debug("detectatm88 raw output: "+baos.toString());
+                                       //From detectatm88.sh script we receive a string like this one: "RESULT: 2"
+                                       //we must split the String and retrieve the integer value
+                                       final String[] parameters = baos.toString().split(" ");
+                                       final int model = Integer.parseInt(parameters[1].trim());
+                                       switch(model){
+                                       case 0:
+                                               logger.warn("TM88 not physically detected: run again detectatm88.sh script");
+                                               formPrinterModelDetected = null;
+                                               break;
+                                       case 2:
+                                               logger.info("TM-T88II detected");
+                                               formPrinterModelDetected = FormPrinterModel.EPSON_TM_88_II_III;
+                                               break;
+                                       case 3:
+                                               logger.info("TM-T88III detected");
+                                               formPrinterModelDetected = FormPrinterModel.EPSON_TM_88_II_III;
+                                               break;
+                                       case 4:
+                                               logger.info("TM-T88IV detected");
+                                               formPrinterModelDetected = FormPrinterModel.EPSON_TM_88_IV;
+                                               break;
+                                       case 5:
+                                               logger.info("TM-T88V detected");
+                                               formPrinterModelDetected = FormPrinterModel.EPSON_TM_88_V;
+                                               break;
+                                       default:
+                                               logger.warn("Code retrieved from detectatm88.sh script does not match.");
+                                               formPrinterModelDetected = null;
+                                               break;
+                                       }               
+                               }
+                               //model not detected
+                               else{
+                                       logger.warn("TM88 not physically detected. Not conected printer or it is not a TM-T88");
+                               }
+                       } catch (Exception e) {
+                               logger.error(e);
+                       } 
+               }
+               else {
+                       logger.warn("Script for tm88 detection not found or not exectuable");
+               }
+
+               return formPrinterModelDetected;
+       }
+
+       /**
+        * This method is intended to add new properties in DtgFormToPrint.properties file used by TM88 printers.
+        * 
+        * @param  property  the property to be added
+        * @param  value     value of property param. Possible values:
+        *                                       <br>
+        *                                       <ul>
+        *                                       <li>printBitmap</li>
+        *                                       <li>printMemoryBitmap</li>
+        *                                       <li>setBitmap</li>
+        *                                       <li>ESC/POS</li>
+        *                                       </ul>
+        * @throws FileNotFoundException if the file called DtgFormToPrint.properties
+        * is not found while writing or reading.
+        * @throws SecurityException if a security manager exists and its
+     * <code>checkWrite</code> method denies write access.
+        * @throws IOException while flushing or closing the DtgFormToPrint.properties file.
+     * @throws NullPointerException if <code>property or value</code> is <code>null</code>
+        */
+       public final static void addFormPrinterProperty(final String property, 
+                                                                               final String value) throws FileNotFoundException, IOException
+       {
+               if (property != null && value != null) {
+                       //If the property does exist we do not have to add it again
+                       if (FormConfiguration.getConfiguration().getSection().get(property) == null)
+                       {
+                               FormConfiguration.getConfiguration().getSection().add(property,value);                  
+                               OutputStream dtgFormConfigurationFile;
+                               dtgFormConfigurationFile = new FileOutputStream
+                                               (new File(System.getProperty(HOME_ENV_KEY),FORM_PROPERTIES_FILE_RELATIVE_PATH));
+                               FormConfiguration.getConfiguration().save(dtgFormConfigurationFile);
+                               dtgFormConfigurationFile.flush();
+                               dtgFormConfigurationFile.close();
+                               
+                               //We have to reload again the configuration.
+                               FormConfiguration.reload();
+                       }
+               }
+               else {
+                       throw new NullPointerException("Input parameters in addFormPrinterProperty: " +
+                                       "invalid null. Object is required. First parameter, property: " + 
+                                       property + " Second parameter, value: " + value);
+               }
+       }
+       
+       /**
+        * This method is intended to remove properties in DtgFormToPrint.properties file used by TM88 printers.
+        * 
+        * @param  property property to be removed
+        * @throws FileNotFoundException if the file called DtgFormToPrint.properties is not found.
+        * @throws SecurityException if a security manager exists and its
+     * <code>checkWrite</code> method denies write access.
+        * @throws IOException while flushing or closing the DtgFormToPrint.properties file.
+     * @throws NullPointerException if <code>property</code> is <code>null</code>
+        */
+       public final static void removeFormPrinterProperty(final String property) throws FileNotFoundException, IOException
+       {
+               if (property != null) {
+                       //If the property does not exist we do not have to remove it
+                       if (FormConfiguration.getConfiguration().getSection().get(property) != null)
+                       {
+                               FormConfiguration.getConfiguration().getSection().remove(property);
+                               OutputStream dtgFormConfigurationFile;
+                               dtgFormConfigurationFile = new FileOutputStream
+                                               (new File(System.getProperty(HOME_ENV_KEY),FORM_PROPERTIES_FILE_RELATIVE_PATH));
+                               FormConfiguration.getConfiguration().save(dtgFormConfigurationFile);
+                               dtgFormConfigurationFile.flush();
+                               dtgFormConfigurationFile.close();
+                               
+                               //We have to reload again the configuration.
+                               FormConfiguration.reload();
+                       }       
+               }
+               else {
+                       throw new NullPointerException("Input parameter in removeFormPrinterProperty: " +
+                                                                                                               "invalid null. Object is required.");
+               }
+       }
+       
+       /**
+        * This method returns a {@code List<File>} with the found files.
+        * 
+        * @param  extension the file extension name
+        * @return the found files
+     * @throws  SecurityException if a security manager exists and its <code>{@link 
+     * java.lang.SecurityManager#checkRead(java.lang.String)}</code>
+     * method denies read access to the directory       
+     */
+       public final static List<File> findFilebyExtension(final String extension)
+       {
+               final File dir = ConfigurationHelper.getInstance().getFormsFolder();
+               
+               final FilenameFilter filter = new FilenameFilter() {
+                       public boolean accept(final File dir, final String name) {
+                               return name.endsWith(extension);
+                       }       
+               };
+               List<File> filesList = new ArrayList<File>();
+
+               for (File file : dir.listFiles(filter)) {
+                       filesList.add(file);
+               }
+                       
+               return filesList;
+       }
+       
+       /**
+        * Read file line by line and stores the lines in a {@link List}
+        * <br>
+        * <b>This method is intended to be as fast as possible, so we are not checking 
+        * the input parameters, it is under your responsability to pass the right 
+        * values to this method. What basically means, you are not allowed to use null
+        * an Object is always required for every input parameter. Otherwise you can expect a
+        * nice exception or something worse.</b>
+        * 
+        * @param file
+        * @param charset the file charset
+        * @return the file lines in a {@link List}
+        * @throws FileNotFoundException if the file does not exist, is a directory 
+        * rather than a regular file, or for some other reason cannot be opened for
+     * reading.
+        * @throws UnsupportedEncodingException if the named charset is not supported
+        * @throws SecurityException if a security manager exists and its
+     * <code>checkRead</code> method denies read access to the file.
+        * @throws IOException if an I/O error occurs while reading the file
+        */
+       public final static List<String> readFile (final File file, final String charset) 
+                                                               throws UnsupportedEncodingException, FileNotFoundException, IOException
+       {
+               final BufferedReader bufferReader = new BufferedReader(new InputStreamReader
+                                                                                                         (new FileInputStream(file), charset));
+               
+               List<String> contents = new ArrayList<String>();
+               String currentLine = null;
+               
+               try {
+                       currentLine = bufferReader.readLine();
+                       while (currentLine != null)
+                       {
+                               contents.add(currentLine);
+                               currentLine = bufferReader.readLine();
+                       }
+               } finally {
+                       bufferReader.close();
+               }
+
+               return contents;
+       }
+       
+       /**
+        * Write lines to file.
+        * <br>
+        * <b>This method is intended to be as fast as possible, so we are not checking 
+        * the input parameters, it is under your responsability to pass the right 
+        * values to this method. What basically means, you are not allowed to use null;
+        * an Object is always required for every input parameter. Otherwise you can expect a
+        * nice exception or something worse.</b>
+        * 
+        * @param contents the lines to be written in a {@link List}
+        * @param charset the file charset
+        * @param fileName the file name. Absolute or abstract pathname, it is your choice
+        * @throws FileNotFoundException if the file exists but is a directory rather 
+        * than a regular file, does not exist but cannot be created, or cannot be 
+        * opened for any other reason
+        * @throws UnsupportedEncodingException if the named encoding is not supported
+        * @throws SecurityException if a security manager exists and its
+     * <code>checkWrite</code> method denies write access.
+        */
+       public final static void writeFile (final List<String> contents, 
+                       final String fileName, final String charset) throws FileNotFoundException, UnsupportedEncodingException 
+       {
+               final OutputStream outputStream = new FileOutputStream(fileName);
+               final PrintStream output = new PrintStream(outputStream, true, FormConfiguration.getCharset());
+               
+               try {
+                       for (String line : contents )
+                       {
+                               output.println(line);
+                       }
+               }
+               finally {
+                    output.close();
+               }
+       }
+       
+       /**
+        * Replace every line (file lines stored in a {@link List})  
+        * with the lineReplacement if the line contains the pattern
+        * <br>
+        * <b>This method is intended to be as fast as possible, so we are not checking 
+        * the input parameters, it is under your responsability to pass the right 
+        * values to this method. What basically means, you are not allowed to use null;
+        * an Object is always required for every input parameter. Otherwise you can expect a
+        * nice exception or something worse.</b>
+        * 
+        * @param contents the lines to be searched in a {@link List}
+        * @param pattern the pattern to match in a line
+        * @param lineReplacement the whole line to replace in case of some match
+        * @return <b><tt>true</tt></b> if there is a match, otherwise <b><tt>false</tt></b>
+     * @throws NullPointerException if <code>pattern</code> is <code>null</code>
+        */
+       public final static boolean replaceLine (final List<String> contents, final String pattern, final String lineReplacement)
+       {
+               final ListIterator<String> itr = contents.listIterator();
+               boolean change = false;
+               
+               while (itr.hasNext())
+               {
+                       if (itr.next().trim().contains(pattern)) {
+                   itr.set(lineReplacement);
+                   change = true;
+                       }
+               }
+               
+               return change;
+       }
+       
+       /**
+        * Method intended to be used by the Logical layer. Search the template files
+        * of the form printer, replace the lines in case of match and write on the hard disk the 
+        * new files.
+        * 
+        * @param pattern the pattern to match
+        * @param lineReplacement the whole line to replace in case of some match
+        * @throws FileNotFoundException while writing or reading a file 
+        * @throws UnsupportedEncodingException  while writing or reading a file 
+        * if the named charset is not supported
+        * @throws IOException if an I/O error occurs while writing or trying to open a file
+     * @throws NullPointerException if <code>pattern or lineReplacement</code> is <code>null</code>
+        */
+       public final static void searchandReplace (final String pattern, 
+                       final String lineReplacement) throws UnsupportedEncodingException, FileNotFoundException, IOException
+       {
+               if (pattern != null && lineReplacement != null) {
+                       final List<File> fileList = PrinterLogicalHelper.findFilebyExtension(TEMPLATE_FILE_EXTENSION);
+                       for (File file : fileList)
+                       {
+                               final List<String> contents = PrinterLogicalHelper.readFile(file, FormConfiguration.getCharset());
+                               if (PrinterLogicalHelper.replaceLine(contents, pattern, lineReplacement))
+                               {
+                                       PrinterLogicalHelper.writeFile(contents, file.getAbsolutePath(), FormConfiguration.getCharset());
+                               }
+                       }
+               }
+               else {
+                       throw new NullPointerException("Input parameters in searchandReplace: " +
+                                       "invalid null. Object is required. First parameter, pattern: " + 
+                                       pattern + " Second parameter, lineReplacement: " + lineReplacement);
+               }
+       }
+       
+       /**
+        * <p>
+        *  This method is smart enough to find out if there is a new form printer model 
+        *  and write the new configuration in the right files. <br>
+        *  It will change the templates and the dtg configuration file if it is required
+        *  (right now while switching from TM-T88V to TM-T88X and vice versa) 
+        *  </p>
+        *  <p>It is intended to hide the ins and outs of the whole nasty process.</p>
+        * 
+        * @param oldModel The previous form printer model
+        * @param newModel The new form printer model
+        * @throws FileNotFoundException 
+        * @throws UnsupportedEncodingException 
+        * @throws IOException
+        *                 If an I/O error occurs while writing or trying to open a file
+        */
+       public final static void changedPrinter (final HardwareModel oldModel, 
+                       final HardwareModel newModel) throws UnsupportedEncodingException, FileNotFoundException, IOException
+       {
+               if(FormPrinterModel.EPSON_TM_88_V.getXmlDescriptor().equals(newModel.getXmlDescriptor()))
+               {
+                       PrinterLogicalHelper.searchandReplace(PATTERN_TO_TM88V, LINE_REPLACEMENT_TO_TM88V);
+                       PrinterLogicalHelper.removeFormPrinterProperty(PRINTER_PROPERTY);
+               }
+               else if (FormPrinterModel.EPSON_TM_88_V.getXmlDescriptor().equals(oldModel.getXmlDescriptor()))
+               {       
+                       PrinterLogicalHelper.searchandReplace(PATTERN_FROM_TM88V, LINE_REPLACEMENT_FROM_TM88V);
+                       PrinterLogicalHelper.addFormPrinterProperty(PRINTER_PROPERTY, PRINTER_PROPERTY_VALUE);
+               }
+       }
+}
\ No newline at end of file