Simplify BaseTask and subclasses

Change-Id: If06c2be264003ab27090adf0a29804d961d28115
Signed-off-by: Gary Wu <gary.i.wu@huawei.com>

4 files changed, 31 insertions, 85 deletions

diff --git a/bpmn/MSOCoreBPMN/src/main/java/org/openecomp/mso/bpmn/core/BaseTask.java b/bpmn/MSOCoreBPMN/src/main/java/org/openecomp/mso/bpmn/core/BaseTask.java
index 849c8ba4f8..5b43c3fc07 100644
--- a/bpmn/MSOCoreBPMN/src/main/java/org/openecomp/mso/bpmn/core/BaseTask.java
+++ b/bpmn/MSOCoreBPMN/src/main/java/org/openecomp/mso/bpmn/core/BaseTask.java
@@ -20,6 +20,9 @@
 
 package org.openecomp.mso.bpmn.core;
 
+import java.util.Objects;
+
+import org.camunda.bpm.engine.ProcessEngineException;
 import org.camunda.bpm.engine.delegate.DelegateExecution;
 import org.camunda.bpm.engine.delegate.Expression;
 import org.camunda.bpm.engine.delegate.JavaDelegate;
@@ -185,13 +188,7 @@ public abstract class BaseTask implements JavaDelegate {
 	protected String getOptionalStringField(Expression expression,
 			DelegateExecution execution, String fieldName) {
 		Object o = getFieldImpl(expression, execution, fieldName, true);
-		if (o instanceof String) {
-			return (String) o;
-		} else if (o == null) {
-			return null;
-		} else {
-			return o.toString();
-		}
+		return Objects.toString(o, null);
 	}
 	
 	/**
@@ -526,4 +523,15 @@ public abstract class BaseTask implements JavaDelegate {
 	public String getTaskName() {
 		return getClass().getSimpleName();
 	}
+
+
+	/**
+	 * Check if shouldFail variable is set to true.
+	 * @param execution
+	 * @return
+	 */
+    protected boolean shouldFail(DelegateExecution execution) {
+        Boolean shouldFail = (Boolean) execution.getVariable("shouldFail");
+        return shouldFail != null && shouldFail;
+    }
 }
diff --git a/bpmn/MSOCoreBPMN/src/main/java/org/openecomp/mso/bpmn/core/ReadConfigTask.java b/bpmn/MSOCoreBPMN/src/main/java/org/openecomp/mso/bpmn/core/ReadConfigTask.java
index b46ffcd7f7..09288f0cff 100644
--- a/bpmn/MSOCoreBPMN/src/main/java/org/openecomp/mso/bpmn/core/ReadConfigTask.java
+++ b/bpmn/MSOCoreBPMN/src/main/java/org/openecomp/mso/bpmn/core/ReadConfigTask.java
@@ -27,7 +27,6 @@ import java.util.Properties;
 import org.camunda.bpm.engine.ProcessEngineException;
 import org.camunda.bpm.engine.delegate.DelegateExecution;
 import org.camunda.bpm.engine.delegate.Expression;
-
 import org.openecomp.mso.logger.MsoLogger;
 
 /**
@@ -57,38 +56,20 @@ public class ReadConfigTask extends BaseTask {
 			msoLogger.debug("propertiesFile = " + thePropertiesFile);
 		}
 
-		Boolean shouldFail = (Boolean) execution.getVariable("shouldFail");
-
-		if (shouldFail != null && shouldFail) {
-			throw new ProcessEngineException(getClass().getSimpleName() + " Failed");
-		}
+        if (shouldFail(execution)) {
+            throw new ProcessEngineException(getTaskName() + " Failed");
+        }
 
 		synchronized (ReadConfigTask.class) {
 			if (properties == null) {
 				properties = new Properties();
 
-				InputStream stream = null;
-
-				try {
-					stream = getClass().getResourceAsStream(thePropertiesFile);
-
+				try(InputStream stream = getClass().getResourceAsStream(thePropertiesFile)) {
 					if (stream == null) {
 						throw new IOException("Resource not found: " + thePropertiesFile);
 					}
 
 					properties.load(stream);
-
-					stream.close();
-					stream = null;
-
-				} finally {
-					if (stream != null) {
-						try {
-							stream.close();
-						} catch (Exception e) {
-							// Do nothing
-						}
-					}
 				}
 			}
 		}
diff --git a/bpmn/MSOCoreBPMN/src/main/java/org/openecomp/mso/bpmn/core/ReadFileTask.java b/bpmn/MSOCoreBPMN/src/main/java/org/openecomp/mso/bpmn/core/ReadFileTask.java
index 389fdc0518..3adba195ea 100644
--- a/bpmn/MSOCoreBPMN/src/main/java/org/openecomp/mso/bpmn/core/ReadFileTask.java
+++ b/bpmn/MSOCoreBPMN/src/main/java/org/openecomp/mso/bpmn/core/ReadFileTask.java
@@ -24,11 +24,11 @@ import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.util.stream.Collectors;
 
 import org.camunda.bpm.engine.ProcessEngineException;
 import org.camunda.bpm.engine.delegate.DelegateExecution;
 import org.camunda.bpm.engine.delegate.Expression;
-
 import org.openecomp.mso.logger.MsoLogger;
 
 /**
@@ -66,45 +66,21 @@ public class ReadFileTask extends BaseTask {
 				+ "file = " + theFile);
 		}
 
-		Boolean shouldFail = (Boolean) execution.getVariable("shouldFail");
-
-		if (shouldFail != null && shouldFail) {
-			throw new ProcessEngineException(getClass().getSimpleName() + " Failed");
-		}
+        if (shouldFail(execution)) {
+            throw new ProcessEngineException(getTaskName() + " Failed");
+        }
 
 		Object value = execution.getVariable(theInputVariable);
 
 		if (value == null) {
-			InputStream xmlStream = null;
-
-			try {
-				xmlStream = getClass().getResourceAsStream(theFile);
+			try(InputStream xmlStream = getClass().getResourceAsStream(theFile)) {
 
 				if (xmlStream == null) {
 					throw new IOException("Resource not found: " + theFile);
 				}
 
 				BufferedReader reader = new BufferedReader(new InputStreamReader(xmlStream));
-				StringBuilder output = new StringBuilder();
-				String line;
-
-				while ((line = reader.readLine()) != null) {
-					output.append(line);
-				}
-
-				xmlStream.close();
-				xmlStream = null;
-
-				value = output.toString();
-
-			} finally {
-				if (xmlStream != null) {
-					try {
-						xmlStream.close();
-					} catch (Exception e) {
-						// Do nothing
-					}
-				}
+				value = reader.lines().collect(Collectors.joining());
 			}
 		}
 		execution.setVariable(theInputVariable, value);
diff --git a/bpmn/MSOCoreBPMN/src/main/java/org/openecomp/mso/bpmn/core/XQueryScriptTask.java b/bpmn/MSOCoreBPMN/src/main/java/org/openecomp/mso/bpmn/core/XQueryScriptTask.java
index 31da7376be..e42806e95e 100644
--- a/bpmn/MSOCoreBPMN/src/main/java/org/openecomp/mso/bpmn/core/XQueryScriptTask.java
+++ b/bpmn/MSOCoreBPMN/src/main/java/org/openecomp/mso/bpmn/core/XQueryScriptTask.java
@@ -25,7 +25,6 @@ import java.io.IOException;
 import java.io.InputStream;

 import java.math.BigDecimal;

 import java.net.URI;

-import java.util.Iterator;

 

 import javax.xml.transform.stream.StreamSource;

 

@@ -33,7 +32,6 @@ import org.camunda.bpm.engine.ProcessEngineException;
 import org.camunda.bpm.engine.delegate.DelegateExecution;

 //import java.util.logging.Logger;

 import org.camunda.bpm.engine.delegate.Expression;

-

 import org.openecomp.mso.logger.MessageEnum;

 import org.openecomp.mso.logger.MsoLogger;

 

@@ -97,11 +95,9 @@ public class XQueryScriptTask extends BaseTask {
 		String[] atomicInputVariableArray = (theAtomicInputVariables == null)

 			? new String[0] : theAtomicInputVariables.split(",[ ]*");

 

-		Boolean shouldFail = (Boolean) execution.getVariable("shouldFail");

-

-		if (shouldFail != null && shouldFail) {

-			throw new ProcessEngineException(getClass().getSimpleName() + " Failed");

-		}

+        if (shouldFail(execution)) {

+            throw new ProcessEngineException(getTaskName() + " Failed");

+        }

 

 		// The script could be compiled once and reused, but we are reading it

 		// and compiling it every time.

@@ -190,9 +186,7 @@ public class XQueryScriptTask extends BaseTask {
 

 		// Evaluate the query and collect the output.

 		StringBuilder output = new StringBuilder();

-		Iterator<XdmItem> xdmItems = evaluator.iterator();

-		while (xdmItems.hasNext()) {

-			XdmItem item = xdmItems.next();

+		for(XdmItem item : evaluator) {

 			

 			if (msoLogger.isDebugEnabled()) {

 				msoLogger.debug("XQuery result item = " + item);

@@ -218,26 +212,13 @@ public class XQueryScriptTask extends BaseTask {
 	 */

 	private XQueryExecutable compile(XQueryCompiler compiler, String resource)

 			throws Exception {

-		InputStream xqStream = null;

-		try {

-			xqStream = getClass().getResourceAsStream(resource);

+		try(InputStream xqStream = getClass().getResourceAsStream(resource)) {

 

 			if (xqStream == null) {

 				throw new IOException("Resource not found: " + resource);

 			}

 

-			XQueryExecutable executable = compiler.compile(xqStream);

-			xqStream.close();

-			xqStream = null;

-			return executable;

-		} finally {

-			if (xqStream != null) {

-				try {

-					xqStream.close();

-				} catch (Exception e) {

-					// Do nothing

-				}

-			}

+			return compiler.compile(xqStream);

 		}

 	}

 }
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