#1297 - ENH: Add DtoQuery ... such that we can map native SQL queries automatically into "DTO beans"

src/main/java/io/ebeaninternal/server/dto/DtoBeanDescriptor.java

@@ -0,0 +1,45 @@
+package io.ebeaninternal.server.dto;
+
+import io.ebeaninternal.metric.QueryPlanCollector;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Manages the query plans for a given DTO bean type.
+ */
+public class DtoBeanDescriptor<T> {
+
+  private final Map<String, DtoQueryPlan> plans = new ConcurrentHashMap<>();
+
+  private final Class<T> dtoType;
+
+  private final DtoMeta meta;
+
+  DtoBeanDescriptor(Class<T> dtoType, DtoMeta meta) {
+    this.dtoType = dtoType;
+    this.meta = meta;
+  }
+
+  public Class<T> getType() {
+    return dtoType;
+  }
+
+  public DtoQueryPlan getQueryPlan(String planKey) {
+    return plans.get(planKey);
+  }
+
+  public DtoQueryPlan buildPlan(DtoMappingRequest request) {
+    return meta.match(request);
+  }
+
+  public void putQueryPlan(String planKey, DtoQueryPlan plan) {
+    plans.put(planKey, plan);
+  }
+
+  public void collectStats(QueryPlanCollector collector) {
+    for (DtoQueryPlan plan : plans.values()) {
+      plan.collectStats(collector);
+    }
+  }
+}