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------------------------------------------------------------
revno: 2497
committer: Lars Helge Overland <larshelge@xxxxxxxxx>
branch nick: dhis2
timestamp: Sun 2011-01-09 18:14:33 +0100
message:
  Impl class PaginatedList
added:
  dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/util/PaginatedList.java
  dhis-2/dhis-support/dhis-support-system/src/test/java/org/hisp/dhis/system/util/PaginatedListTest.java


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=== added file 'dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/util/PaginatedList.java'
--- dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/util/PaginatedList.java	1970-01-01 00:00:00 +0000
+++ dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/util/PaginatedList.java	2011-01-09 17:14:33 +0000
@@ -0,0 +1,72 @@
+package org.hisp.dhis.system.util;
+
+/*
+ * Copyright (c) 2004-2010, University of Oslo
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ * * 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.
+ * * Neither the name of the HISP project 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 COPYRIGHT OWNER 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.
+ */
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+/**
+ * @author Lars Helge Overland
+ */
+public class PaginatedList<T>
+    extends ArrayList<T>
+{
+    private final int pageSize;
+
+    private int fromIndex = 0;
+    
+    public PaginatedList( Collection<? extends T> collection, int pageSize )
+    {
+        super( collection );
+        this.pageSize = pageSize;
+    }
+    
+    /**
+     * Returns the next page in the list. The page size is defined by the argument
+     * given in the constructor. If there is no more pages, null is returned. The
+     * returned page is not guaranteed to have the same size as the page size.
+     */
+    public List<T> getPage()
+    {
+        int size = size();
+        
+        if ( fromIndex >= size )
+        {
+            return null;
+        }
+        
+        int toIndex = Math.min( ( fromIndex + pageSize ), size );
+        
+        List<T> page = subList( fromIndex, toIndex );
+        
+        fromIndex = toIndex;
+        
+        return page;
+    }
+}

=== added file 'dhis-2/dhis-support/dhis-support-system/src/test/java/org/hisp/dhis/system/util/PaginatedListTest.java'
--- dhis-2/dhis-support/dhis-support-system/src/test/java/org/hisp/dhis/system/util/PaginatedListTest.java	1970-01-01 00:00:00 +0000
+++ dhis-2/dhis-support/dhis-support-system/src/test/java/org/hisp/dhis/system/util/PaginatedListTest.java	2011-01-09 17:14:33 +0000
@@ -0,0 +1,75 @@
+package org.hisp.dhis.system.util;
+
+/*
+ * Copyright (c) 2004-2010, University of Oslo
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * * Redistributions of source code must retain the above copyright notice, this
+ *   list of conditions and the following disclaimer.
+ * * 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.
+ * * Neither the name of the HISP project 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 COPYRIGHT OWNER 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.
+ */
+
+import static junit.framework.Assert.*;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.junit.Test;
+
+/**
+ * @author Lars Helge Overland
+ */
+public class PaginatedListTest
+{
+    @Test
+    public void testGetPage()
+    {
+        PaginatedList<String> list = new PaginatedList<String>( Arrays.asList( "A", "B", "C" ), 2 );
+        
+        List<String> page = list.getPage();
+        
+        assertNotNull( page );
+        assertEquals( 2, page.size() );
+        assertTrue( page.contains( "A" ) );
+        assertTrue( page.contains( "B" ) );
+        
+        page = list.getPage();
+        
+        assertNotNull( page );
+        assertEquals( 1, page.size() );
+        assertTrue( page.contains( "C" ) );
+        
+        page = list.getPage();
+        
+        assertNull( page );
+    }
+    
+    @Test
+    public void testGetPageEmpty()
+    {
+        PaginatedList<String> list = new PaginatedList<String>( new ArrayList<String>(), 2 );
+        
+        List<String> page = list.getPage();
+        
+        assertNull( page );
+    }
+}