Add DynamicCall EO to GamUtils

(cherry picked from commit c1be143)

Author: sgrampone

gamutils/pom.xml

@@ -41,6 +41,11 @@
             <artifactId>commons-io</artifactId>
             <version>2.11.0</version>
         </dependency>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>gxcommon</artifactId>
+            <version>${project.version}</version>
+        </dependency>
         <dependency>
             <groupId>commons-codec</groupId>
             <artifactId>commons-codec</artifactId>

gamutils/src/main/java/com/genexus/gam/utils/DynamicCall.java

@@ -0,0 +1,100 @@
+package com.genexus.gam.utils;
+
+import com.genexus.ModelContext;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+@SuppressWarnings("unused")
+public class DynamicCall {
+	private final ModelContext mContext;
+	private final Integer mRemoteHandle;
+	private static final Logger logger = LogManager.getLogger(DynamicCall.class);
+
+	/********EXTERNAL OBJECT PUBLIC METHODS  - BEGIN ********/
+
+	@SuppressWarnings("unused")
+	public DynamicCall(ModelContext context, Integer remoteHandle) {
+		mContext = context;
+		mRemoteHandle = remoteHandle;
+	}
+
+	@SuppressWarnings("unused")
+	public boolean execute(String assembly, String typeName, boolean useContext, String method, String jsonParms, String[] jsonOutput) {
+		logger.debug("execute");
+		return doCall(assembly, typeName, useContext, method, false, "", jsonParms, jsonOutput);
+	}
+
+	@SuppressWarnings("unused")
+	public boolean executeEventHandler(String assembly, String typeName, boolean useContext, String method, String eventType, String jsonInput, String[] jsonOutput) {
+		logger.debug("executeEventHandler");
+		return doCall(assembly, typeName, useContext, method, true, eventType, jsonInput, jsonOutput);
+	}
+
+	/********EXTERNAL OBJECT PUBLIC METHODS  - END ********/
+
+
+	private boolean doCall(String assembly, String typeName, boolean useContext, String method, boolean isEventHandler, String parm1, String parm2, String[] jsonOutput) {
+		logger.debug("doCall");
+		Object[] parms;
+		Class<?>[] parmTypes;
+		if (isEventHandler) {
+			parms = new Object[]{parm1, parm2, new String[]{jsonOutput[0]}};
+			parmTypes = new Class[]{String.class, String.class, String[].class};
+		} else {
+			parms = new Object[]{parm2, new String[]{jsonOutput[0]}};
+			parmTypes = new Class[]{String.class, String[].class};
+		}
+
+		try {
+			Class<?> myClass = Class.forName(typeName);
+			Class<?>[] constructorParms;
+			Constructor<?> constructor;
+			Object instance = null;
+
+			if (useContext && (mContext != null)) {
+				try {
+					constructorParms = new Class[]{int.class, ModelContext.class};
+					constructor = myClass.getConstructor(constructorParms);
+					instance = constructor.newInstance(new Object[]{mRemoteHandle, mContext});
+				} catch (NoSuchMethodException e) {
+					logger.error("doCall", e);
+				}
+			}
+
+			if (instance == null) {
+				constructorParms = new Class[]{int.class};
+				constructor = myClass.getConstructor(constructorParms);
+				instance = constructor.newInstance(new Object[]{-2});
+			}
+
+			myClass.getMethod(method, parmTypes).invoke(instance, parms);
+		} catch (ClassNotFoundException e) {
+			logger.error("doCall", e);
+			jsonOutput[0] = "{\"error\":\"" + " class " + typeName + " not found" + "\"}";
+			return false;
+		} catch (NoSuchMethodException e) {
+			logger.error("doCall", e);
+			jsonOutput[0] = "{\"error\":\"" + " method " + method + " not found" + "\"}";
+			return false;
+		} catch (InstantiationException e) {
+			logger.error("doCall", e);
+			jsonOutput[0] = "{\"error\":\"" + " cannot instantiate type " + typeName + "\"}";
+			return false;
+		} catch (IllegalAccessException e) {
+			logger.error("doCall", e);
+			jsonOutput[0] = "{\"error\":\"" + " cannot access method " + method + "\"}";
+			return false;
+		} catch (InvocationTargetException e) {
+			logger.error("doCall", e);
+			jsonOutput[0] = "{\"error\":\"" + " InvocationTargetException in class " + typeName + "\"}";
+			return false;
+		}
+		String[] result = (String[]) parms[parms.length - 1];
+		jsonOutput[0] = result[0];
+		logger.debug("doCall result {}", result[0]);
+		return true;
+	}
+}