Added pre-canned facets isBlank(value) and isError(value).

git-svn-id: http://google-refine.googlecode.com/svn/trunk@196 7d457c2a-affb-35e4-300a-418c747d4874

src/main/java/com/metaweb/gridworks/gel/ControlFunctionRegistry.java

@@ -57,6 +57,7 @@ import com.metaweb.gridworks.gel.controls.ForEach;
 import com.metaweb.gridworks.gel.controls.ForNonBlank;
 import com.metaweb.gridworks.gel.controls.If;
 import com.metaweb.gridworks.gel.controls.IsBlank;
+import com.metaweb.gridworks.gel.controls.IsError;
 import com.metaweb.gridworks.gel.controls.IsNonBlank;
 import com.metaweb.gridworks.gel.controls.IsNotNull;
 import com.metaweb.gridworks.gel.controls.IsNull;
@@ -169,5 +170,6 @@ public class ControlFunctionRegistry {
         registerControl("isBlank", new IsBlank());
         registerControl("isNonBlank", new IsNonBlank());
         registerControl("isNumeric", new IsNumeric());
+        registerControl("isError", new IsError());
     }
 }

src/main/java/com/metaweb/gridworks/gel/controls/IsError.java

@@ -0,0 +1,15 @@
+package com.metaweb.gridworks.gel.controls;
+
+import com.metaweb.gridworks.expr.ExpressionUtils;
+
+public class IsError extends IsTest {
+    @Override
+    protected String getDescription() {
+        return "Returns whether o is an error";
+    }
+
+    @Override
+    protected boolean test(Object o) {
+        return ExpressionUtils.isError(o);
+    }
+}

src/main/webapp/scripts/views/data-table-column-header-ui.js

@@ -170,6 +170,33 @@ DataTableColumnHeaderUI.prototype._createMenuForColumnHeader = function(elmt) {
                             }
                         );
                     }
+                },
+                {},
+                {
+                    label: "By Error",
+                    click: function() {
+                        ui.browsingEngine.addFacet(
+                            "list", 
+                            {
+                                "name" : self._column.headerLabel + ": Error?",
+                                "columnName" : self._column.headerLabel, 
+                                "expression" : "isError(value)"
+                            }
+                        );
+                    }
+                },
+                {
+                    label: "By Blank",
+                    click: function() {
+                        ui.browsingEngine.addFacet(
+                            "list", 
+                            {
+                                "name" : self._column.headerLabel + ": Blank?",
+                                "columnName" : self._column.headerLabel, 
+                                "expression" : "isBlank(value)"
+                            }
+                        );
+                    }
                 }
             ]
         },