function DataTableCellUI(dataTableView, cell, rowIndex, cellIndex, td) {
    this._dataTableView = dataTableView;
    this._cell = cell;
    this._rowIndex = rowIndex;
    this._cellIndex = cellIndex;
    this._td = td;
    
    this._render();
}

DataTableCellUI.prototype._render = function() {
    var self = this;
    var cell = this._cell;
    
    var divContent = $('<div/>')
        .addClass("data-table-cell-content");
        
    var editLink = $('<a href="javascript:{}">&nbsp;</a>')
        .addClass("data-table-cell-edit")
        .attr("title", "Edit this cell")
        .appendTo(divContent)
        .click(function() { self._startEdit(this); });
        
    $(this._td).empty()
        .unbind()
        .mouseenter(function() { editLink.css("visibility", "visible"); })
        .mouseleave(function() { editLink.css("visibility", "hidden"); });
    
    if (!cell || ("v" in cell && cell.v === null)) {
        $('<span>').html("&nbsp;").appendTo(divContent);
    } else if ("e" in cell) {
        $('<span>').addClass("data-table-error").text(cell.e).appendTo(divContent);
    } else if (!("r" in cell) || !cell.r) {
        if (typeof cell.v !== "string") {
            if (typeof cell.v == "number") {
                divContent.addClass("data-table-cell-content-numeric");
            }
            $('<span>')
                .addClass("data-table-value-nonstring")
                .text(cell.v)
                .appendTo(divContent);
        } else if (URL.looksLikeUrl(cell.v)) {
            $('<a>')
                .text(cell.v)
                .attr("href", cell.v)
                .attr("target", "_blank")
                .appendTo(divContent);
        } else {
            $('<span>')
                .text(cell.v)
                .appendTo(divContent);
        }
    } else {
        var r = cell.r;
        var service = (r.service) ? ReconciliationManager.getServiceFromUrl(r.service) : null;
        
        if (r.j == "new") {
            $('<span>').text(cell.v + " (new topic) ").appendTo(divContent);
            
            $('<a href="javascript:{}"></a>')
                .text("re\u2011match")
                .addClass("data-table-recon-action")
                .appendTo(divContent).click(function(evt) {
                    self._doRematch();
                });
        } else if (r.j == "matched" && "m" in r && r.m !== null) {
            var match = cell.r.m;
            var a = $('<a></a>')
                .text(match.name)
                .attr("target", "_blank")
                .appendTo(divContent);
                
            if (service && (service.view) && (service.view.url)) {
                a.attr("href", service.view.url.replace("{{id}}", match.id));
            } else if (ReconciliationManager.isFreebaseIdOrMid(r.identifierSpace)) {
                a.attr("href", "http://www.freebase.com/view" + match.id);
            }
                
            $('<span> </span>').appendTo(divContent);
            $('<a href="javascript:{}"></a>')
                .text("re\u2011match")
                .addClass("data-table-recon-action")
                .appendTo(divContent)
                .click(function(evt) {
                    self._doRematch();
                });
        } else {
            $('<span>').text(cell.v).appendTo(divContent);
            
            if (this._dataTableView._showRecon) {
                var ul = $('<div></div>').addClass("data-table-recon-candidates").appendTo(divContent);
                if ("c" in r && r.c.length > 0) {
                    var candidates = r.c;
                    var renderCandidate = function(candidate, index) {
                        var li = $('<div></div>').addClass("data-table-recon-candidate").appendTo(ul);
                        
                        $('<a href="javascript:{}">&nbsp;</a>')
                            .addClass("data-table-recon-match-similar")
                            .attr("title", "Match this topic to this cell and other cells with the same content")
                            .appendTo(li).click(function(evt) {
                                self._doMatchTopicToSimilarCells(candidate);
                            });
                            
                        $('<a href="javascript:{}">&nbsp;</a>')
                            .addClass("data-table-recon-match")
                            .attr("title", "Match this topic to this cell")
                            .appendTo(li).click(function(evt) {
                                self._doMatchTopicToOneCell(candidate);
                            });
                            
                        var a = $('<a></a>')
                            .addClass("data-table-recon-topic")
                            .attr("target", "_blank")
                            .text(candidate.name)
                            .appendTo(li);
                            
                        if ((service) && (service.view) && (service.view.url)) {
                            a.attr("href", service.view.url.replace("{{id}}", candidate.id));
                        } else if (ReconciliationManager.isFreebaseIdOrMid(r.identifierSpace)) {
                            a.attr("href", "http://www.freebase.com/view" + candidate.id);
                        }
                            
                        var preview = null;
                        if ((service) && (service.preview)) {
                            preview = service.preview;
                        } else if (ReconciliationManager.isFreebaseIdOrMid(r.identifierSpace)) {
                            preview = DataTableCellUI.topicBlockPreview;
                        }
                        if (preview) {
                            a.click(function(evt) {
                                if (!evt.metaKey && !evt.ctrlKey) {
                                    self._previewCandidateTopic(candidate, this, preview);
                                    evt.preventDefault();
                                    return false;
                                }
                            });
                        }
                            
                        var score;
                        if (candidate.score < 1) {
                            score = Math.round(candidate.score * 1000) / 1000;
                        } else {
                            score = Math.round(candidate.score);
                        }
                        $('<span></span>').addClass("data-table-recon-score").text("(" + score + ")").appendTo(li);
                    };
                    
                    for (var i = 0; i < candidates.length; i++) {
                        renderCandidate(candidates[i], i);
                    }
                }
                
                var liNew = $('<div></div>').addClass("data-table-recon-candidate").appendTo(ul);
                $('<a href="javascript:{}">&nbsp;</a>')
                    .addClass("data-table-recon-match-similar")
                    .attr("title", "Create a new topic for this cell and other cells with the same content")
                    .appendTo(liNew).click(function(evt) {
                        self._doMatchNewTopicToSimilarCells();
                    });
                    
                $('<a href="javascript:{}">&nbsp;</a>')
                    .addClass("data-table-recon-match")
                    .attr("title", "Create a new topic for this cell")
                    .appendTo(liNew).click(function(evt) {
                        self._doMatchNewTopicToOneCell();
                    });
                    
                $('<span>').text("(New topic)").appendTo(liNew);
                
                var suggestOptions;
                var addSuggest = false;
                if ((service) && (service.suggest) && (service.suggest.entity)) {
                    suggestOptions = service.suggest.entity;
                    addSuggest = true;
                } else if (ReconciliationManager.isFreebaseIdOrMid(r.identifierSpace)) {
                    addSuggest = true;
                }
                    
                if (addSuggest) {
                    $('<a href="javascript:{}"></a>')
                        .addClass("data-table-recon-search")
                        .click(function(evt) {
                            self._searchForMatch(suggestOptions);
                            return false;
                        })
                        .text("search for match")
                        .appendTo($('<div>').appendTo(divContent));
                }
            }
        }
    }
    
    divContent.appendTo(this._td);
};

DataTableCellUI.prototype._doRematch = function() {
    this._doJudgment("none");
};

DataTableCellUI.prototype._doMatchNewTopicToOneCell = function() {
    this._doJudgment("new");
};

DataTableCellUI.prototype._doMatchNewTopicToSimilarCells = function() {
    this._doJudgmentForSimilarCells("new", {}, { shareNewTopics: true }, true);
};

DataTableCellUI.prototype._doMatchTopicToOneCell = function(candidate) {
    this._doJudgment("matched", {}, {
        id : candidate.id,
        name: candidate.name,
        score: candidate.score,
        types: candidate.types.join(",")
   });
};

DataTableCellUI.prototype._doMatchTopicToSimilarCells = function(candidate) {
    this._doJudgmentForSimilarCells("matched", {}, {
        id : candidate.id,
        name: candidate.name,
        score: candidate.score,
        types: candidate.types.join(",")
    }, true);
};

DataTableCellUI.prototype._doJudgment = function(judgment, params, bodyParams) {
    this._postProcessOneCell(
        "recon-judge-one-cell",
        params || {},
        $.extend(bodyParams || {}, {
            row: this._rowIndex,
            cell: this._cellIndex,
            judgment: judgment,
            identifierSpace: (this._cell.r) ? this._cell.r.identifierSpace : null,
            schemaSpace: (this._cell.r) ? this._cell.r.schemaSpace : null
        }),
        true
    );
};

DataTableCellUI.prototype._doJudgmentForSimilarCells = function(judgment, params, bodyParams) {
    this._postProcessSeveralCells(
        "recon-judge-similar-cells",
        params || {},
        $.extend(bodyParams || {}, {
            columnName: Refine.cellIndexToColumn(this._cellIndex).name,
            similarValue: this._cell.v,
            judgment: judgment,
            identifierSpace: (this._cell.r) ? this._cell.r.identifierSpace : null,
            schemaSpace: (this._cell.r) ? this._cell.r.schemaSpace : null
        }),
        true
    );
};

DataTableCellUI.prototype._searchForMatch = function(suggestOptions) {
    var self = this;
    var frame = $(DOM.loadHTML("core", "scripts/views/data-table/cell-recon-search-for-match.html"));
    var elmts = DOM.bind(frame);
    
    var level = DialogSystem.showDialog(frame);
    var dismiss = function() {
        DialogSystem.dismissUntil(level - 1);
    };
    
    elmts.cellTextSpan.text(this._cell.v);
    
    var match = null;
    var commit = function() {
        if (match !== null) {
            var params = {
                judgment: "matched",
                id: match.id,
                name: match.name,
                types: $.map(match.type, function(elmt) {
                    return typeof elmt == "string" ? elmt : elmt.id; 
                }).join(",")
            };
            
            if (elmts.radioSimilar[0].checked) {
                params.similarValue = self._cell.v;
                params.columnName = Refine.cellIndexToColumn(self._cellIndex).name;

                self._postProcessSeveralCells("recon-judge-similar-cells", {}, params, true);
            } else {
                params.row = self._rowIndex;
                params.cell = self._cellIndex;

                self._postProcessOneCell("recon-judge-one-cell", {}, params, true);
            }
            
            dismiss();
        }
    };
    var commitNew = function() {
        if (elmts.radioSimilar[0].checked) {
            self._doMatchNewTopicToSimilarCells();
        } else {
            self._doMatchNewTopicToOneCell();
        }
        dismiss();
    };
    
    elmts.okButton.click(commit);
    elmts.newButton.click(commitNew);
    elmts.cancelButton.click(dismiss);
    
    var suggestOptions2 = $.extend({ align: "left" }, suggestOptions || { all_types: true });
    elmts.input
        .attr("value", this._cell.v)
        .suggest(suggestOptions2)
        .bind("fb-select", function(e, data) {
            match = data;
            commit();
        })
        .focus()
        .data("suggest").textchange();
};

DataTableCellUI.prototype._postProcessOneCell = function(command, params, bodyParams, columnStatsChanged) {
    var self = this;

    Refine.postCoreProcess(
        command, 
        params, 
        bodyParams,
        { columnStatsChanged: columnStatsChanged },
        {
            onDone: function(o) {
                Refine.preparePool(o.pool);
                if (o.cell.r) {
                    o.cell.r = o.pool.recons[o.cell.r];
                }
                
                self._cell = o.cell;
                self._dataTableView._updateCell(self._rowIndex, self._cellIndex, self._cell);
                self._render();
            }
        }
    );
};

DataTableCellUI.prototype._postProcessSeveralCells = function(command, params, bodyParams, columnStatsChanged) {
    Refine.postCoreProcess(
        command, 
        params, 
        bodyParams,
        { cellsChanged: true, columnStatsChanged: columnStatsChanged }
    );
};

DataTableCellUI.topicBlockPreview = {
    url: 'http://www.freebase.com/widget/topic{{id}}?mode=content&blocks=[{"block":"full_info"},{"block":"article_props"}]',
    width: 430,
    height: 300
};

DataTableCellUI.prototype._previewCandidateTopic = function(candidate, elmt, preview) {
    var self = this;
    var id = candidate.id;
    var url = preview.url.replace("{{id}}", id);

    var fakeMenu = MenuSystem.createMenu();
    fakeMenu
        .width(preview.width)
        .css("background", "none")
        .css("border", "none")
        .html(DOM.loadHTML("core", "scripts/views/data-table/cell-recon-preview-popup-header.html"));

    var iframe = $('<iframe></iframe>')
        .addClass("data-table-topic-popup-iframe")
        .width(preview.width)
        .height(preview.height)
        .attr("src", url)
        .appendTo(fakeMenu);

    MenuSystem.showMenu(fakeMenu, function(){});
    MenuSystem.positionMenuLeftRight(fakeMenu, $(elmt));
    
    var elmts = DOM.bind(fakeMenu);
    elmts.matchButton.click(function() {
        self._doMatchTopicToOneCell(candidate);
        MenuSystem.dismissAll();
    });
    elmts.matchSimilarButton.click(function() {
        self._doMatchTopicToSimilarCells(candidate);
        MenuSystem.dismissAll();
    });
};

DataTableCellUI.prototype._startEdit = function(elmt) {
    self = this;
    
    var originalContent = !this._cell || ("v" in this._cell && this._cell.v === null) ? "" : this._cell.v;
    
    var menu = MenuSystem.createMenu().addClass("data-table-cell-editor").width("400px");
    menu.html(DOM.loadHTML("core", "scripts/views/data-table/cell-editor.html"));
    var elmts = DOM.bind(menu);
    
    MenuSystem.showMenu(menu, function(){});
    MenuSystem.positionMenuLeftRight(menu, $(this._td));
    
    var commit = function() {
        var type = elmts.typeSelect[0].value;
        var applyOthers = elmts.applyOthersCheckbox[0].checked;
        
        var text = elmts.textarea[0].value;
        var value = text;
        
        if (type == "number") {
            value = parseFloat(text);
            if (isNaN(value)) {
                alert("Not a valid number.");
                return;
            }
        } else if (type == "boolean") {
            value = ("true" == text);
        } else if (type == "date") {
            value = Date.parse(text);
            if (!value) {
                alert("Not a valid date.");
                return;
            }
            value = value.toString("yyyy-MM-ddTHH:mm:ssZ");
        }
        
        MenuSystem.dismissAll();
        
        if (applyOthers) {
            Refine.postCoreProcess(
                "mass-edit",
                {},
                {
                    columnName: Refine.cellIndexToColumn(self._cellIndex).name,
                    expression: "value",
                    edits: JSON.stringify([{
                        from: [ originalContent ],
                        to: value,
                        type: type
                    }])
                },
                { cellsChanged: true }
            );            
        } else {
            Refine.postCoreProcess(
                "edit-one-cell", 
                {},
                {
                    row: self._rowIndex,
                    cell: self._cellIndex,
                    value: value,
                    type: type
                },
                {},
                {
                    onDone: function(o) {
                        Refine.preparePool(o.pool);
                        if (o.cell.r) {
                            o.cell.r = o.pool.recons[o.cell.r];
                        }
                        
                        self._cell = o.cell;
                        self._dataTableView._updateCell(self._rowIndex, self._cellIndex, self._cell);
                        self._render();
                    }
                }
            );
        }
    };
    
    elmts.okButton.click(commit);
    elmts.textarea
        .text(originalContent)
        .keydown(function(evt) {
            if (!evt.shiftKey) {
                if (evt.keyCode == 13) {
                    if (evt.ctrlKey) {
                        elmts.applyOthersCheckbox[0].checked = true;
                    }
                    commit();
                } else if (evt.keyCode == 27) {
                    MenuSystem.dismissAll();
                }
            }
        })
        .select()
        .focus();
        
    elmts.cancelButton.click(function() {
        MenuSystem.dismissAll();
    });
};