#919 - io.ebean package initial

src/main/java/io/ebeaninternal/server/query/CQueryOrderBy.java

@@ -0,0 +1,77 @@
+package io.ebeaninternal.server.query;
+
+import io.ebean.OrderBy;
+import io.ebean.OrderBy.Property;
+import io.ebeaninternal.api.SpiQuery;
+import io.ebeaninternal.server.deploy.BeanDescriptor;
+import io.ebeaninternal.server.deploy.BeanProperty;
+import io.ebeaninternal.server.deploy.BeanPropertyAssoc;
+import io.ebeaninternal.server.deploy.id.IdBinder;
+import io.ebeaninternal.server.el.ElPropertyValue;
+
+import java.util.List;
+
+/**
+ * Creates the order by expression clause.
+ */
+class CQueryOrderBy {
+
+  private final BeanDescriptor<?> desc;
+
+  private final SpiQuery<?> query;
+
+  /**
+   * Create the logical order by clause.
+   */
+  public static String parse(BeanDescriptor<?> desc, SpiQuery<?> query) {
+    return new CQueryOrderBy(desc, query).parseInternal();
+  }
+
+  private CQueryOrderBy(BeanDescriptor<?> desc, SpiQuery<?> query) {
+    this.desc = desc;
+    this.query = query;
+  }
+
+  private String parseInternal() {
+
+    OrderBy<?> orderBy = query.getOrderBy();
+    if (orderBy == null) {
+      return null;
+    }
+
+    StringBuilder sb = new StringBuilder();
+
+    List<Property> properties = orderBy.getProperties();
+    if (properties.isEmpty()) {
+      // order by clause removed by filterMany()
+      return null;
+    }
+    for (int i = 0; i < properties.size(); i++) {
+      if (i > 0) {
+        sb.append(", ");
+      }
+      Property p = properties.get(i);
+      String expression = parseProperty(p);
+      sb.append(expression);
+    }
+    return sb.toString();
+  }
+
+  private String parseProperty(Property p) {
+
+    String propName = p.getProperty();
+    ElPropertyValue el = desc.getElGetValue(propName);
+    if (el == null) {
+      return p.toStringFormat();
+    }
+
+    BeanProperty beanProperty = el.getBeanProperty();
+    if (beanProperty instanceof BeanPropertyAssoc<?>) {
+      BeanPropertyAssoc<?> ap = (BeanPropertyAssoc<?>) beanProperty;
+      IdBinder idBinder = ap.getTargetDescriptor().getIdBinder();
+      return idBinder.getOrderBy(el.getElName(), p.isAscending());
+    }
+
+    return p.toStringFormat();
+  }
+}