[Fix #1025] Allow using a different factory for context.

impl/core/src/main/java/io/serverlessworkflow/impl/WorkflowApplication.java

@@ -70,6 +70,7 @@ public class WorkflowApplication implements AutoCloseable {
   private final Collection<EventPublisher> eventPublishers;
   private final boolean lifeCycleCEPublishingEnabled;
   private final WorkflowModelFactory modelFactory;
+  private final WorkflowModelFactory contextFactory;
   private final WorkflowScheduler scheduler;
   private final Map<String, WorkflowAdditionalObject<?>> additionalObjects;
   private final ConfigManager configManager;
@@ -93,6 +94,7 @@ private WorkflowApplication(Builder builder) {
     this.eventPublishers = builder.eventPublishers;
     this.lifeCycleCEPublishingEnabled = builder.lifeCycleCEPublishingEnabled;
     this.modelFactory = builder.modelFactory;
+    this.contextFactory = builder.contextFactory;
     this.scheduler = builder.scheduler;
     this.schedulerListener = builder.schedulerListener;
     this.additionalObjects = builder.additionalObjects;
@@ -175,6 +177,7 @@ public SchemaValidator getValidator(SchemaInline inline) {
         () -> new RuntimeDescriptor("reference impl", "1.0.0_alpha", Collections.emptyMap());
     private boolean lifeCycleCEPublishingEnabled = true;
     private WorkflowModelFactory modelFactory;
+    private WorkflowModelFactory contextFactory;
     private Map<String, WorkflowAdditionalObject<?>> additionalObjects = new HashMap<>();
     private SecretManager secretManager;
     private ConfigManager configManager;
@@ -273,6 +276,11 @@ public Builder withModelFactory(WorkflowModelFactory modelFactory) {
       return this;
     }
 
+    public Builder withContextFactory(WorkflowModelFactory contextFactory) {
+      this.contextFactory = contextFactory;
+      return this;
+    }
+
     public WorkflowApplication build() {
       if (modelFactory == null) {
         modelFactory =
@@ -283,6 +291,9 @@ public WorkflowApplication build() {
                         new IllegalStateException(
                             "WorkflowModelFactory instance has to be set in WorkflowApplication or present in the classpath"));
       }
+      if (contextFactory == null) {
+        contextFactory = modelFactory;
+      }
       ServiceLoader.load(ExpressionFactory.class).forEach(exprFactories::add);
       if (schemaValidatorFactory == null) {
         schemaValidatorFactory =
@@ -373,6 +384,10 @@ public WorkflowModelFactory modelFactory() {
     return modelFactory;
   }
 
+  public WorkflowModelFactory contextFactory() {
+    return contextFactory;
+  }
+
   public RuntimeDescriptorFactory runtimeDescriptorFactory() {
     return runtimeDescriptorFactory;
   }

impl/core/src/main/java/io/serverlessworkflow/impl/WorkflowContext.java

@@ -23,7 +23,7 @@ public class WorkflowContext implements WorkflowContextData {
   WorkflowContext(WorkflowDefinition definition, WorkflowMutableInstance instance) {
     this.definition = definition;
     this.instance = instance;
-    this.context = definition.application().modelFactory().fromNull();
+    this.context = definition.application().contextFactory().fromNull();
   }
 
   @Override

impl/core/src/main/java/io/serverlessworkflow/impl/WorkflowUtils.java

@@ -25,6 +25,7 @@
 import io.serverlessworkflow.api.types.UriTemplate;
 import io.serverlessworkflow.api.types.Workflow;
 import io.serverlessworkflow.impl.expressions.ExpressionDescriptor;
+import io.serverlessworkflow.impl.expressions.ExpressionFactory;
 import io.serverlessworkflow.impl.expressions.ExpressionUtils;
 import io.serverlessworkflow.impl.resources.ResourceLoader;
 import io.serverlessworkflow.impl.schema.SchemaValidator;
@@ -77,7 +78,9 @@ public static Optional<WorkflowFilter> buildWorkflowFilter(WorkflowApplication a
 
   public static Optional<WorkflowFilter> buildWorkflowFilter(WorkflowApplication app, ExportAs as) {
     return as != null
-        ? Optional.of(buildFilterFromStrObject(app, as.getString(), as.getObject()))
+        ? Optional.of(
+            buildFilterFromStrObject(
+                app.expressionFactory(), app.contextFactory(), as.getString(), as.getObject()))
         : Optional.empty();
   }
 
@@ -118,8 +121,12 @@ private static WorkflowValueResolver<String> toString(String literal) {
 
   private static WorkflowFilter buildFilterFromStrObject(
       WorkflowApplication app, String str, Object object) {
-    return app.expressionFactory()
-        .buildFilter(new ExpressionDescriptor(str, object), app.modelFactory());
+    return buildFilterFromStrObject(app.expressionFactory(), app.modelFactory(), str, object);
+  }
+
+  private static WorkflowFilter buildFilterFromStrObject(
+      ExpressionFactory exprFactory, WorkflowModelFactory modelFactory, String str, Object object) {
+    return exprFactory.buildFilter(new ExpressionDescriptor(str, object), modelFactory);
   }
 
   public static WorkflowValueResolver<Map<String, Object>> buildMapResolver(