#115 - Mapping - Add support for @ElementCollection enhancement

Initial support - simple List.

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

@@ -0,0 +1,86 @@
+package io.ebeaninternal.server.query;
+
+import io.ebeaninternal.server.deploy.DbReadContext;
+import io.ebeaninternal.server.deploy.DbSqlContext;
+import io.ebeaninternal.server.type.ScalarType;
+
+import java.util.List;
+
+/**
+ * A property in the SQL Tree.
+ * <p>
+ * A BeanProperty or a dynamically created property based on formula.
+ */
+public interface STreeProperty {
+
+  /**
+   * Return the property name.
+   */
+  String getName();
+
+  /**
+   * Return the full property name (for error messages).
+   */
+  String getFullBeanName();
+
+  /**
+   * Return true if the property is the Id.
+   */
+  boolean isId();
+
+  /**
+   * Return true if the property is an embedded type.
+   */
+  boolean isEmbedded();
+
+  /**
+   * Return true if the property is an aggregation.
+   */
+  boolean isAggregation();
+
+  /**
+   * Return true if the property is a formula.
+   */
+  boolean isFormula();
+
+  /**
+   * Return the encryption key as a string value (when the property is encrypted).
+   */
+  String getEncryptKeyAsString();
+
+  /**
+   * Return the Expression language prefix (join path).
+   */
+  String getElPrefix();
+
+  /**
+   * Return the underlying scalar type for the property (for findSingleAttribute).
+   */
+  ScalarType<?> getScalarType();
+
+  /**
+   * For RawSql build the select chain.
+   */
+  void buildRawSqlSelectChain(String prefix, List<String> selectChain);
+
+  /**
+   * Load into the bean (from the DataReader/ResultSet).
+   */
+  void load(SqlBeanLoad sqlBeanLoad);
+
+  /**
+   * Ignore the property (moving the column index position without reading).
+   */
+  void loadIgnore(DbReadContext ctx);
+
+  /**
+   * Append to the select clause.
+   */
+  void appendSelect(DbSqlContext ctx, boolean subQuery);
+
+  /**
+   * Append to the from clause.
+   */
+  void appendFrom(DbSqlContext ctx, SqlJoinType joinType);
+
+}