Added rest endpoint for rule simulation.

Signed-off-by: Sönke Küper <soenkekueper@gmx.de>

bundles/org.openhab.core.automation.rest/src/main/java/org/openhab/core/automation/rest/internal/RuleResource.java

@@ -17,10 +17,12 @@
 import java.io.IOException;
 import java.net.URLEncoder;
 import java.nio.charset.StandardCharsets;
+import java.time.ZonedDateTime;
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 import java.util.function.Predicate;
+import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
 import javax.annotation.security.RolesAllowed;
@@ -47,6 +49,7 @@
 import org.openhab.core.automation.ManagedRuleProvider;
 import org.openhab.core.automation.Module;
 import org.openhab.core.automation.Rule;
+import org.openhab.core.automation.RuleExecution;
 import org.openhab.core.automation.RuleManager;
 import org.openhab.core.automation.RuleRegistry;
 import org.openhab.core.automation.Trigger;
@@ -70,6 +73,7 @@
 import org.openhab.core.io.rest.RESTConstants;
 import org.openhab.core.io.rest.RESTResource;
 import org.openhab.core.io.rest.Stream2JSONInputStream;
+import org.openhab.core.library.types.DateTimeType;
 import org.osgi.service.component.annotations.Activate;
 import org.osgi.service.component.annotations.Component;
 import org.osgi.service.component.annotations.Reference;
@@ -339,6 +343,23 @@ public Response getTriggers(@PathParam("ruleUID") @Parameter(description = "rule
         }
     }
 
+    @GET
+    @Path("/simulation")
+    @Produces(MediaType.APPLICATION_JSON)
+    @Operation(operationId = "getRuleSimulation", summary = "Simulates the executions for the rules within the schedule.", responses = {
+            @ApiResponse(responseCode = "200", description = "OK", content = @Content(array = @ArraySchema(schema = @Schema(implementation = RuleExecution.class)))) })
+    public Response simulateRules(@Parameter(description = "from") String from,
+            @Parameter(description = "from") String until) {
+        final Stream<RuleExecution> ruleExecutions = ruleManager.simulateRuleExecutions(parseTime(from),
+                parseTime(until));
+        return Response.ok(ruleExecutions.collect(Collectors.toList())).build();
+    }
+
+    private static ZonedDateTime parseTime(String sTime) {
+        final DateTimeType dateTime = new DateTimeType(sTime);
+        return dateTime.getZonedDateTime();
+    }
+
     @GET
     @Path("/{ruleUID}/conditions")
     @Produces(MediaType.APPLICATION_JSON)