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// Copyright 2004, 2005 The Apache Software Foundation
//
// 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 org.apache.tapestry.contrib.table.components;

import org.apache.tapestry.BaseComponent;
import org.apache.tapestry.IForm;
import org.apache.tapestry.TapestryUtils;
import org.apache.tapestry.contrib.table.model.ITableAction;
import org.apache.tapestry.contrib.table.model.ITableColumn;
import org.apache.tapestry.contrib.table.model.ITableModel;
import org.apache.tapestry.contrib.table.model.ITableModelSource;

/**
 * The facade component in the Table family. Table allows you to present a
 * sortable and pagable table simply and easily by using only this one
 * component. Please see the Component Reference for details on how to use this
 * component. [ Component
 * Reference ]
 * 
 * @author mindbridge
 */
public abstract class Table extends BaseComponent implements ITableModelSource
{

    public abstract boolean getVolatile();

    /**
     * @see org.apache.tapestry.contrib.table.model.ITableModelSource#getTableModel()
     */
    public ITableModel getTableModel()
    {
        return getTableViewComponent().getTableModel();
    }

    /**
     * Indicates that the table model has changed and it may need to saved. This
     * method has to be invoked if modifications are made to the model.
     * 
     * @see org.apache.tapestry.contrib.table.model.ITableModelSource#fireObservedStateChange()
     */
    public void fireObservedStateChange()
    {
        getTableViewComponent().fireObservedStateChange();
    }

    /**
     * Resets the state of the component and forces it to load a new TableModel
     * from the tableModel binding the next time it renders.
     */
    public void reset()
    {
        getTableViewComponent().reset();
    }

    /**
     * Returns the currently rendered table column. You can call this method to
     * obtain the current column.
     * 
     * @return ITableColumn the current table column
     */
    public ITableColumn getTableColumn()
    {
        Object objCurrentRow = getTableRow();

        // if the current row is null, then we are most likely rendering
        // TableColumns
        if (objCurrentRow == null)
            return getTableColumnsComponent().getTableColumn();

        return getTableValuesComponent().getTableColumn();
    }

    /**
     * Returns the currently rendered table row or null if the rows are not
     * rendered at the moment. You can call this method to obtain the current
     * row.
     * 
     * @return Object the current table row
     */
    public Object getTableRow()
    {
        return getTableRowsComponent().getTableRow();
    }

    protected TableView getTableViewComponent()
    {
        return (TableView) getComponent("tableView");
    }

    protected TableColumns getTableColumnsComponent()
    {
        return (TableColumns) getComponent("tableColumns");
    }

    protected TableRows getTableRowsComponent()
    {
        return (TableRows) getComponent("tableRows");
    }

    protected TableValues getTableValuesComponent()
    {
        return (TableValues) getComponent("tableValues");
    }

    public boolean getShowNormalPages()
    {
        if (getVolatile()) return true;

        IForm form = (IForm) getPage().getRequestCycle().getAttribute(
                TapestryUtils.FORM_ATTRIBUTE);
        return (form == null);
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.tapestry.contrib.table.model.ITableModelSource#storeTableAction(org.apache.tapestry.contrib.table.model.ITableAction)
     */
    public void storeTableAction(ITableAction action)
    {
        getTableViewComponent().storeTableAction(action);
    }
}