spring-projects#282 - Expose 'RenderContext' from 'StatementMapper' to be able to build SQL manually

Author: rchigvintsev

Diff for: src/main/java/org/springframework/data/r2dbc/core/DefaultStatementMapper.java

@@ -226,6 +226,15 @@ public PreparedOperation<Delete> getMappedObject(DeleteSpec deleteSpec) {
 		return getMappedObject(deleteSpec, null);
 	}
 
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.data.r2dbc.function.StatementMapper#getRenderContext()
+	 */
+	@Override
+	public RenderContext getRenderContext() {
+		return renderContext;
+	}
+
 	private PreparedOperation<Delete> getMappedObject(DeleteSpec deleteSpec,
 			@Nullable RelationalPersistentEntity<?> entity) {
 
@@ -375,5 +384,14 @@ public PreparedOperation<?> getMappedObject(UpdateSpec updateSpec) {
 		public PreparedOperation<?> getMappedObject(DeleteSpec deleteSpec) {
 			return DefaultStatementMapper.this.getMappedObject(deleteSpec, this.entity);
 		}
+
+		/*
+		 * (non-Javadoc)
+		 * @see org.springframework.data.r2dbc.function.StatementMapper#getRenderContext()
+		 */
+		@Override
+		public RenderContext getRenderContext() {
+			return DefaultStatementMapper.this.getRenderContext();
+		}
 	}
 }

Diff for: src/main/java/org/springframework/data/r2dbc/core/StatementMapper.java

@@ -34,6 +34,7 @@
 import org.springframework.data.relational.core.sql.Expression;
 import org.springframework.data.relational.core.sql.SqlIdentifier;
 import org.springframework.data.relational.core.sql.Table;
+import org.springframework.data.relational.core.sql.render.RenderContext;
 import org.springframework.lang.Nullable;
 
 /**
@@ -177,6 +178,16 @@ default DeleteSpec createDelete(SqlIdentifier table) {
 		return DeleteSpec.create(table);
 	}
 
+	/**
+	 * Returns {@link RenderContext}.
+	 *
+	 * @return {@link RenderContext} instance or {@literal null} if {@link RenderContext} is not available
+	 */
+	@Nullable
+	default RenderContext getRenderContext() {
+		return null;
+	}
+
 	/**
 	 * {@code SELECT} specification.
 	 */