1 files changed, 69 insertions, 0 deletions
diff --git a/das-java/trunk/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/PagerImpl.java b/das-java/trunk/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/PagerImpl.java
new file mode 100644
index 0000000000..27b653763b
--- /dev/null
+++ b/das-java/trunk/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/PagerImpl.java
@@ -0,0 +1,69 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.    
+ */
+package org.apache.tuscany.das.rdb.impl;
+
+import org.apache.tuscany.das.rdb.Command;
+import org.apache.tuscany.das.rdb.Pager;
+
+import commonj.sdo.DataObject;
+
+public class PagerImpl implements Pager {
+
+    private final ReadCommandImpl command;
+
+    private final int size;
+
+    private int idx = 1;
+
+    public PagerImpl(Command command, int size) {
+        this.command = (ReadCommandImpl) command;
+        this.command.enablePaging();
+        this.size = size;
+    }
+
+    public DataObject next() {
+        int start = idx;
+        int end = idx + size;
+        idx += size;
+        command.setStartRow(start);
+        command.setEndRow(end);
+        return command.executeQuery();
+    }
+
+    public DataObject getPage(int page) {
+        int end = (page * size) + 1;
+        int start = end - size;
+        idx = end;
+        command.setStartRow(start);
+        command.setEndRow(end);
+        return command.executeQuery();
+    }
+
+    public DataObject previous() {
+        int start = idx - (2 * size);
+        if (start < 1) {
+            start = 1;
+        }
+        int end = start + size;
+        idx = end;
+        command.setStartRow(start);
+        command.setEndRow(end);
+        return command.executeQuery();
+    }
+}