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/*
* Copyright 2000-2014 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.client.widget.grid;
import com.google.gwt.dom.client.TableCellElement;
import com.vaadin.client.widgets.Grid;
/**
* A data class which contains information which identifies a cell in a
* {@link Grid}.
* <p>
* Since this class follows the <code>Flyweight</code>-pattern any instance of
* this object is subject to change without the user knowing it and so should
* not be stored anywhere outside of the method providing these instances.
*
* @author Vaadin Ltd
* @param <T>
* the type of the row object containing this cell
* @since 7.4
*/
public class CellReference<T> {
private int columnIndex;
private Grid.Column<?, T> column;
private final RowReference<T> rowReference;
public CellReference(RowReference<T> rowReference) {
this.rowReference = rowReference;
}
/**
* Sets the identifying information for this cell.
*
* @param columnIndex
* the index of the column
* @param column
* the column object
*/
public void set(int columnIndex, Grid.Column<?, T> column) {
this.columnIndex = columnIndex;
this.column = column;
}
/**
* Gets the grid that contains the referenced cell.
*
* @return the grid that contains referenced cell
*/
public Grid<T> getGrid() {
return rowReference.getGrid();
}
/**
* Gets the row index of the row.
*
* @return the index of the row
*/
public int getRowIndex() {
return rowReference.getRowIndex();
}
/**
* Gets the row data object.
*
* @return the row object
*/
public T getRow() {
return rowReference.getRow();
}
/**
* Gets the index of the column.
*
* @return the index of the column
*/
public int getColumnIndex() {
return columnIndex;
}
/**
* Gets the column objects.
*
* @return the column object
*/
public Grid.Column<?, T> getColumn() {
return column;
}
/**
* Gets the value of the cell.
*
* @return the value of the cell
*/
public Object getValue() {
return getColumn().getValue(getRow());
}
/**
* Get the element of the cell.
*
* @return the element of the cell
*/
public TableCellElement getElement() {
return rowReference.getElement().getCells().getItem(columnIndex);
}
/**
* Gets the RowReference for this CellReference.
*
* @return the row reference
*/
protected RowReference<T> getRowReference() {
return rowReference;
}
}
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