Fix issue gephi#566 by creating a Self-Loop Filter

FiltersPlugin/src/org/gephi/filters/plugin/edge/Bundle.properties

@@ -1,2 +1,4 @@
 EdgeWeightBuilder.name = Edge Weight
-EdgeWeightBuilder.description = Keep edges within a particular weight range
+EdgeWeightBuilder.description = Keep edges within a particular weight range
+SelfLoopFilterBuilder.name = Self-Loop
+SelfLoopFilterBuilder.description = Removes self-loops

FiltersPlugin/src/org/gephi/filters/plugin/edge/SelfLoopFilterBuilder.java

@@ -0,0 +1,108 @@
+/*
+Copyright 2008-2012 Gephi
+Authors : Luiz Ribeiro <luizribeiro@gmail.com>
+Website : http://www.gephi.org
+
+This file is part of Gephi.
+
+DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+
+Copyright 2011 Gephi Consortium. All rights reserved.
+
+The contents of this file are subject to the terms of either the GNU
+General Public License Version 3 only ("GPL") or the Common
+Development and Distribution License("CDDL") (collectively, the
+"License"). You may not use this file except in compliance with the
+License. You can obtain a copy of the License at
+http://gephi.org/about/legal/license-notice/
+or /cddl-1.0.txt and /gpl-3.0.txt. See the License for the
+specific language governing permissions and limitations under the
+License.  When distributing the software, include this License Header
+Notice in each file and include the License files at
+/cddl-1.0.txt and /gpl-3.0.txt. If applicable, add the following below the
+License Header, with the fields enclosed by brackets [] replaced by
+your own identifying information:
+"Portions Copyrighted [year] [name of copyright owner]"
+
+If you wish your version of this file to be governed by only the CDDL
+or only the GPL Version 3, indicate your decision by adding
+"[Contributor] elects to include this software in this distribution
+under the [CDDL or GPL Version 3] license." If you do not indicate a
+single choice of license, a recipient has the option to distribute
+your version of this file under either the CDDL, the GPL Version 3 or
+to extend the choice of license to its licensees as provided above.
+However, if you add GPL Version 3 code and therefore, elected the GPL
+Version 3 license, then the option applies only if the new code is
+made subject to such option by the copyright holder.
+
+Contributor(s):
+
+Portions Copyrighted 2011 Gephi Consortium.
+ */
+package org.gephi.filters.plugin.edge;
+
+import javax.swing.Icon;
+import javax.swing.JPanel;
+import org.gephi.filters.api.FilterLibrary;
+import org.gephi.filters.spi.*;
+import org.gephi.graph.api.Edge;
+import org.gephi.graph.api.Graph;
+import org.openide.util.NbBundle;
+import org.openide.util.lookup.ServiceProvider;
+
+/**
+ *
+ * @author Luiz Ribeiro
+ */
+@ServiceProvider(service = FilterBuilder.class)
+public class SelfLoopFilterBuilder implements FilterBuilder {
+
+    public Category getCategory() {
+        return FilterLibrary.EDGE;
+    }
+
+    public String getName() {
+        return NbBundle.getMessage(SelfLoopFilterBuilder.class, "SelfLoopFilterBuilder.name");
+    }
+
+    public Icon getIcon() {
+        return null;
+    }
+
+    public String getDescription() {
+        return NbBundle.getMessage(SelfLoopFilterBuilder.class, "SelfLoopFilterBuilder.description");
+    }
+
+    public Filter getFilter() {
+        return new SelfLoopFilter();
+    }
+
+    public JPanel getPanel(Filter filter) {
+        return null;
+    }
+
+    public void destroy(Filter filter) {
+    }
+
+    public static class SelfLoopFilter implements EdgeFilter {
+
+        public boolean init(Graph graph) {
+            return true;
+        }
+
+        public String getName() {
+            return NbBundle.getMessage(SelfLoopFilterBuilder.class, "SelfLoopFilterBuilder.name");
+        }
+
+        public boolean evaluate(Graph graph, Edge edge) {
+            return !edge.isSelfLoop();
+        }
+
+        public void finish() {
+        }
+
+        public FilterProperty[] getProperties() {
+            return null;
+        }
+    }
+}