added new system task type 23

src/main/java/es/uv/saic/service/InstanciaTascaService.java

@@ -15,6 +15,9 @@ import org.springframework.beans.factory.annotation.Value;
 import org.springframework.stereotype.Service;
 import org.springframework.util.StringUtils;
 
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
 import es.uv.saic.shared.domain.Document;
 import es.uv.saic.shared.domain.Email;
 import es.uv.saic.shared.domain.EvidenciaTransfer;
@@ -314,9 +317,85 @@ public class InstanciaTascaService {
 			it.setEstat("E");
 			this.saveChanges(user, it);
 		}
+		else if(tipus == 23){ /* Generate final evidence */
+
+			/* 
+				JSON de ejemplo para el campo opcions
+				{
+					"accions": [
+						{ "select_from": [1, 3] },
+						{ "select_from": [2, 4] },
+						{ "select_from": [5] },
+						{ "combine": true }
+					]
+				}
+			*/
+
+			ObjectMapper mapper = new ObjectMapper();
+
+			JsonNode root = mapper.readTree(it.getTasca().getOpcions());
+			JsonNode actions = root.get("accions");
+
+			List<String> selectedPaths = new ArrayList<>();
+			String outputFile = this.filePath + it.getIdInstanciaTasca().toString() + ".pdf";
+			boolean success = false;
+
+			for (JsonNode action : actions) {
+				if (action.has("select_from")) {
+					List<Integer> values = new ArrayList<>();
+					for (JsonNode value : action.get("select_from")) {
+						values.add(value.asInt());
+					}
+					InstanciaTasca itaux = instanciaTascaRepository.getValidFromIdTascaps(values);
+					String selectedPath = itaux.getEvidencia();
+					if (selectedPath != null && !selectedPath.isEmpty()) {
+						selectedPaths.add(this.filePath + selectedPath);
+					}
+				}
+
+				else if (action.has("combine") && action.get("combine").asBoolean()) {
+					success = combineDocuments(selectedPaths, outputFile);
+				}
+			}
+
+			if(success){
+				it.setEvidencia(outputFile);
+				it.setEstat("E");
+				this.saveChanges(user, it);
+			}
+		}
 		
 		return it;
 	}
+
+	public boolean combineDocuments(List<String> inputPaths, String outputPath){
+		List<String> cmd = new ArrayList<String>();
+		cmd.add("pdfunite");
+		for(String path : inputPaths) {
+			cmd.add(path);
+		}
+		cmd.add(outputPath);
+		
+		ProcessBuilder builder = new ProcessBuilder();
+		builder.command(cmd.toArray(new String[]{}));
+		try {
+			Process process = builder.start();
+			process.waitFor();
+			return true;
+		}
+		catch (IOException e) {
+			e.printStackTrace();
+		} 
+		catch (InterruptedException e) {
+			e.printStackTrace();
+			if (Thread.interrupted()) {
+				Thread.currentThread().interrupt();
+			}
+		}
+
+		return false;
+	}
+
 	
 	public void saveChanges(Usuari user, InstanciaTasca it) {