added regular expression

Issue #177

imixs-archive-exporter/README.md

@@ -16,11 +16,20 @@ The Imixs-Archive-Exporter is controlled by corresponding [EventLog Entries](htt
 	<timeout>60000</timeout>
         <document>
              <path>my-documents/</path>
+             <filter>\.pdf$</filter>
         </document>
  </eventlog>
 ```
 
-On each corresponding worklfow event a new event log entry `file.export` will be created. The Imixs-Archive-Exporter periodically check this event log entries and exports the corresponding files into a configured data space.
+On each corresponding workflow event a new event log entry `file.export` will be created. The Imixs-Archive-Exporter periodically check this event log entries and exports the corresponding files into a configured data space.
+
+## Path
+
+The optional event parameter `path` can be used to specify the target path for the file to be exported.
+
+## Filter
+
+The optional event parameter `filter` can be used to specify a regular expression to match the file name. This option can be used to export only a part of file from a workitem. For example the regular expression `\.pdf$` exports only files with the suffix '.pdf'.
 
 # Configuration
 

imixs-archive-exporter/src/main/java/org/imixs/archive/export/services/SchedulerService.java

@@ -26,6 +26,8 @@
 import java.util.Map;
 import java.util.Optional;
 import java.util.logging.Logger;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 import org.eclipse.microprofile.config.inject.ConfigProperty;
 import org.eclipse.microprofile.metrics.MetricRegistry;
@@ -232,11 +234,17 @@ public void onTimeout(jakarta.ejb.Timer _timer) {
                 id = eventLogEntry.getItemValueString("id");
                 ref = eventLogEntry.getItemValueString("ref");
                 String path = "";
+                String filter = "";
+                Pattern pattern = null;
                 // test if we have a data structure with a path information
                 List<Map> dataList = eventLogEntry.getItemValue("data");
                 if (dataList != null && dataList.size() > 0) {
                     ItemCollection dataItemCol = new ItemCollection(dataList.get(0));
                     path = dataItemCol.getItemValueString("path");
+                    filter = dataItemCol.getItemValueString("filter");
+                    if (!filter.isEmpty()) {
+                        pattern = Pattern.compile(filter);
+                    }
                 }
 
                 try {
@@ -247,6 +255,15 @@ public void onTimeout(jakarta.ejb.Timer _timer) {
 
                     // iterate over all Files and export it
                     for (FileData fileData : fileDataList) {
+                        // in case of a exiting filter, we test if the file name matches the filter
+                        // criteria
+                        if (pattern != null) {
+                            Matcher matcher = pattern.matcher(fileData.getName());
+                            if (!matcher.find()) {
+                                // no match!
+                                continue;
+                            }
+                        }
                         fileService.writeFileData(fileData, path);
                         success++;
                     }

imixs-archive-exporter/src/test/java/org/imixs/archive/exporter/TestFilter.java

@@ -0,0 +1,38 @@
+package org.imixs.archive.exporter;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * Test the Optional expression
+ * 
+ * @author rsoika
+ * 
+ */
+public class TestFilter {
+
+    /**
+     * Test filter regex
+     * 
+     */
+    @Test
+    public void testOptional() {
+        String name = "example.pdf";
+
+        String filter = "(\\.pdf$)";
+
+        Pattern pattern = Pattern.compile(filter);
+        Matcher matcher = pattern.matcher(name);
+
+        if (!matcher.find()) {
+            Assert.fail();
+        }
+
+        // Assert.assertTrue(name.matches(filter));
+
+    }
+
+}