Add PagedList was part of #96

src/main/java/com/avaje/ebeaninternal/server/query/LimitOffsetPagedList.java

@@ -0,0 +1,110 @@
+package com.avaje.ebeaninternal.server.query;
+
+import java.util.List;
+import java.util.concurrent.Future;
+
+import javax.persistence.PersistenceException;
+
+import com.avaje.ebean.EbeanServer;
+import com.avaje.ebean.PagedList;
+import com.avaje.ebeaninternal.api.Monitor;
+import com.avaje.ebeaninternal.api.SpiQuery;
+
+/**
+ * PagedList implementation based on limit offset types of queries.
+ * 
+ * @param <T>
+ *          the entity bean type
+ */
+public class LimitOffsetPagedList<T> implements PagedList<T> {
+
+  private final transient EbeanServer server;
+
+  private final SpiQuery<T> query;
+
+  private final int pageSize;
+
+  private final int pageIndex;
+
+  private final Monitor monitor = new Monitor();
+
+  private Future<Integer> futureRowCount;
+
+  private List<T> list;
+
+  public LimitOffsetPagedList(EbeanServer server, SpiQuery<T> query, int pageIndex, int pageSize) {
+    this.server = server;
+    this.query = query;
+    this.pageSize = pageSize;
+    this.pageIndex = pageIndex;
+  }
+
+  public void loadRowCount() {
+    getFutureRowCount();
+  }
+  
+  public Future<Integer> getFutureRowCount() {
+    synchronized (monitor) {
+      if (futureRowCount == null) {
+        futureRowCount = server.findFutureRowCount(query, null);
+      }
+      return futureRowCount;
+    }
+  }
+  
+  public List<T> getList() {
+    synchronized (monitor) {
+      if (list == null) {
+        query.setFirstRow(pageIndex * pageSize);
+        query.setMaxRows(pageSize);
+
+        list = server.findList(query, null);
+      }
+      return list;
+    }
+  }
+
+  public int getTotalPageCount() {
+
+    int rowCount = getTotalRowCount();
+    if (rowCount == 0) {
+      return 0;
+    } else {
+      return ((rowCount - 1) / pageSize) + 1;
+    }
+  }
+
+  public int getTotalRowCount() {
+    try {
+      return getFutureRowCount().get();
+    } catch (Exception e) {
+      throw new PersistenceException(e);
+    }
+  }
+
+  public boolean hasNext() {
+    return pageIndex < (getTotalPageCount() - 1);
+  }
+
+  public boolean hasPrev() {
+    return pageIndex > 0;
+  }
+
+  public int getPageIndex() {
+    return pageIndex;
+  }
+
+  public int getPageSize() {
+    return pageSize;
+  }
+
+  public String getDisplayXtoYofZ(String to, String of) {
+
+    int first = pageIndex * pageSize + 1;
+    int last = first + getList().size() - 1;
+    int total = getTotalRowCount();
+
+    return first + to + last + of + total;
+  }
+
+}