bpmn/MSOCoreBPMN/src/main/java/org/openecomp/mso/bpmn/core/ReadFileTask.java

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  * ONAP - SO
   4  * ================================================================================
   5  * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
   6  * Copyright (C) 2017 Huawei Technologies Co., Ltd. All rights reserved.
   7  * ================================================================================
   8  * Licensed under the Apache License, Version 2.0 (the "License");
   9  * you may not use this file except in compliance with the License.
  10  * You may obtain a copy of the License at
  11  *
  12  *      http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  * ============LICENSE_END=========================================================
  20  */
  21
  22 package org.openecomp.mso.bpmn.core;
  23
  24 import java.io.BufferedReader;
  25 import java.io.IOException;
  26 import java.io.InputStream;
  27 import java.io.InputStreamReader;
  28
  29 import org.camunda.bpm.engine.ProcessEngineException;
  30 import org.camunda.bpm.engine.delegate.DelegateExecution;
  31 import org.camunda.bpm.engine.delegate.Expression;
  32
  33 import org.openecomp.mso.logger.MsoLogger;
  34
  35 /**
  36  * Conditionally reads the contents of a resource file as a string and stores it
  37  * in an execution variable.  The file is read only if the value of the input
  38  * variable is null.
  39  * <p>
  40  * Required fields:<br/><br/>
  41  * &nbsp;&nbsp;&nbsp;&nbsp;file: the resource file path<br/>
  42  * &nbsp;&nbsp;&nbsp;&nbsp;inputVariable: the input variable name<br/>
  43  * &nbsp;&nbsp;&nbsp;&nbsp;outputVariable: the output variable name<br/>
  44  */
  45 public class ReadFileTask extends BaseTask {
  46
  47         private Expression file;
  48         private Expression inputVariable;
  49         private Expression outputVariable;
  50
  51         private static MsoLogger msoLogger = MsoLogger.getMsoLogger(MsoLogger.Catalog.BPEL);
  52
  53         public void execute(DelegateExecution execution) throws Exception {
  54                 if (msoLogger.isDebugEnabled()) {
  55                         msoLogger.debug("Started Executing " + getTaskName());
  56                 }
  57
  58                 String theInputVariable =
  59                         getStringField(inputVariable, execution, "inputVariable");
  60                 String theOutputVariable =
  61                         getOutputField(outputVariable, execution, "outputVariable");
  62                 String theFile =getStringField(file, execution, "file");
  63
  64                 if (msoLogger.isDebugEnabled()) {
  65                         msoLogger.debug("inputVariable = " + theInputVariable
  66                                 + " outputVariable = " + theOutputVariable
  67                                 + "file = " + theFile);
  68                 }
  69
  70                 Boolean shouldFail = (Boolean) execution.getVariable("shouldFail");
  71
  72                 if (shouldFail != null && shouldFail) {
  73                         throw new ProcessEngineException(getClass().getSimpleName() + " Failed");
  74                 }
  75
  76                 Object value = execution.getVariable(theInputVariable);
  77
  78                 if (value == null) {
  79                         try (InputStream xmlStream = getClass().getResourceAsStream(theFile);
  80                                 BufferedReader reader = new BufferedReader(new InputStreamReader(xmlStream))) {
  81                                 StringBuilder output = new StringBuilder();
  82                                 String line;
  83
  84                                 while ((line = reader.readLine()) != null) {
  85                                         output.append(line);
  86                                 }
  87                                 value = output.toString();
  88
  89                         } catch (Exception e) {
  90                                 msoLogger.debug("Exception at readResourceFile stream: " + e);
  91                         }
  92                 }
  93                 execution.setVariable(theInputVariable, value);
  94                 execution.setVariable(theOutputVariable, value);
  95                 msoLogger.debug ("ServiceInput - " + execution.getVariable("gServiceInput"));
  96                 if (msoLogger.isDebugEnabled()) {
  97                         msoLogger.debug("Done Executing " + getTaskName());
  98                 }
  99         }
 100 }