start implementing paging and server side sorting for users, groups and repositories

scm-core/src/main/java/sonia/scm/Manager.java

@@ -81,4 +81,20 @@ public interface Manager<T extends ModelObject, E extends Exception>
    * @return
    */
   public Collection<T> getAll();
+
+  /**
+   * Method description
+   *
+   *
+   *
+   * @param sortby
+   * @param desc
+   * @param start
+   * @param limit
+   *
+   * @return
+   * @since 1.4
+   */
+  public Collection<T> getAll(String sortby, boolean desc, int start,
+                              int limit);
 }

scm-core/src/main/java/sonia/scm/util/AssertUtil.java

@@ -119,4 +119,19 @@ public class AssertUtil
       throw new IllegalStateException("object is not valid");
     }
   }
+
+  /**
+   * throws an IllegalArgumentException if the value is smaller then 0
+   *
+   *
+   * @param value
+   * @since 1.4
+   */
+  public static void assertPositive(int value)
+  {
+    if (value < 0)
+    {
+      throw new IllegalArgumentException("value is smaller then 0");
+    }
+  }
 }

scm-core/src/main/java/sonia/scm/util/CollectionAppender.java

@@ -0,0 +1,58 @@
+/**
+ * Copyright (c) 2010, Sebastian Sdorra
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of SCM-Manager; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://bitbucket.org/sdorra/scm-manager
+ *
+ */
+
+
+
+package sonia.scm.util;
+
+//~--- JDK imports ------------------------------------------------------------
+
+import java.util.Collection;
+
+/**
+ *
+ * @author Sebastian Sdorra
+ *
+ * @param <T>
+ * @since 1.4
+ */
+public interface CollectionAppender<T>
+{
+
+  /**
+   * Method description
+   *
+   *
+   * @param collection
+   * @param item
+   */
+  public void append(Collection<T> collection, T item);
+}

scm-core/src/main/java/sonia/scm/util/Util.java

@@ -38,9 +38,13 @@ package sonia.scm.util;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 
+import java.util.ArrayList;
 import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
 import java.util.Date;
 import java.util.Iterator;
+import java.util.List;
 import java.util.Map;
 import java.util.TimeZone;
 
@@ -177,6 +181,117 @@ public class Util
     return time;
   }
 
+  /**
+   * Method description
+   *
+   *
+   * @param values
+   * @param comparator
+   * @param start
+   * @param limit
+   * @param <T>
+   *
+   * @return
+   * @since 1.4
+   */
+  public static <T> Collection<T> createSubCollection(Collection<T> values,
+          Comparator<T> comparator, int start, int limit)
+  {
+    return createSubCollection(values, comparator, null, start, limit);
+  }
+
+  /**
+   * Method description
+   *
+   *
+   * @param values
+   * @param start
+   * @param limit
+   * @param <T>
+   *
+   * @return
+   * @since 1.4
+   */
+  public static <T> Collection<T> createSubCollection(Collection<T> values,
+          int start, int limit)
+  {
+    return createSubCollection(values, null, null, start, limit);
+  }
+
+  /**
+   * Method description
+   *
+   *
+   * @param values
+   * @param appender
+   * @param start
+   * @param limit
+   * @param <T>
+   *
+   * @return
+   * @since 1.4
+   */
+  public static <T> Collection<T> createSubCollection(Collection<T> values,
+          CollectionAppender<T> appender, int start, int limit)
+  {
+    return createSubCollection(values, null, appender, start, limit);
+  }
+
+  /**
+   * Method description
+   *
+   *
+   *
+   * @param values
+   * @param comparator
+   * @param appender
+   * @param start
+   * @param limit
+   * @param <T>
+   *
+   * @return
+   * @since 1.4
+   */
+  public static <T> Collection<T> createSubCollection(Collection<T> values,
+          Comparator<T> comparator, CollectionAppender<T> appender, int start,
+          int limit)
+  {
+    List<T> result = new ArrayList<T>();
+    List<T> valueList = new ArrayList(values);
+
+    if (comparator != null)
+    {
+      Collections.sort(valueList, comparator);
+    }
+
+    int length = valueList.size();
+    int end = start + limit;
+
+    if (length > start)
+    {
+      if (length < end)
+      {
+        end = length;
+      }
+
+      valueList = valueList.subList(start, end);
+
+      if (appender == null)
+      {
+        result = valueList;
+      }
+      else
+      {
+        for (T v : valueList)
+        {
+          appender.append(result, v);
+        }
+      }
+    }
+
+    return result;
+  }
+
   /**
    * Method description
    *