TableCreateHandler.java

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * 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.motorolamobility.studio.android.db.core.command;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.datatools.modelbase.sql.tables.Table;
import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.wizard.WizardDialog;
import org.eclipse.osgi.util.NLS;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.PlatformUI;

import com.motorolamobility.studio.android.db.core.DbCoreActivator;
import com.motorolamobility.studio.android.db.core.i18n.DbCoreNLS;
import com.motorolamobility.studio.android.db.core.model.TableModel;
import com.motorolamobility.studio.android.db.core.ui.ITreeNode;
import com.motorolamobility.studio.android.db.core.ui.action.ITableCreatorNode;
import com.motorolamobility.studio.android.db.core.ui.wizards.CreateTableWizard;

public class TableCreateHandler extends AbstractHandler
{
    private ITableCreatorNode tableCreatorNode = null;

    public TableCreateHandler()
    {
    }

    public TableCreateHandler(ITableCreatorNode tableCreatorNode)
    {
        this.tableCreatorNode = tableCreatorNode;
    }

    /* (non-Javadoc)
     * @see org.eclipse.core.commands.IHandler#execute(org.eclipse.core.commands.ExecutionEvent)
     */
    public Object execute(ExecutionEvent event) throws ExecutionException
    {
        if (tableCreatorNode == null)
        {
            tableCreatorNode = getSelectedItem();
        }

        //tableCreatorNode may be null if the action come from toolbar
        //and the selected item is not an ITableCreatorNode
        if (tableCreatorNode != null)
        {
            Shell shell = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell();

            boolean tableAdded = false;

            // loop used to validate the new table name. If it already exists 
            // tell the user and open the table wizard again.
            while (!tableAdded)
            {
                //repeat while table not added and dialog not cancelled 
                CreateTableWizard createTableWizard = new CreateTableWizard();
                Set<String> notAllowedNames = getNotAllowedNames(tableCreatorNode.getTables());
                createTableWizard.setNotAllowedNames(notAllowedNames);
                WizardDialog dialog = new WizardDialog(shell, createTableWizard);
                dialog.open();

                if (dialog.getReturnCode() == Dialog.OK)
                {
                    TableModel newTable = createTableWizard.getTable();
                    if (newTable != null)
                    {
                        boolean tableNameAlreadyExists = false;
                        for (Table table : tableCreatorNode.getTables())
                        {
                            if (table.getName().equalsIgnoreCase(newTable.getName()))
                            {
                                tableNameAlreadyExists = true;
                                break;
                            }
                        }
                        if (!tableNameAlreadyExists)
                        {
                            tableCreatorNode.createTable(newTable);
                            tableCreatorNode = null; //clear selected node to force getSelectedItem to be called when calling via toolbar
                            tableAdded = true;
                        }
                        else
                        {
                            //notify error that table already exists
                            MessageDialog
                                    .openError(
                                            PlatformUI.getWorkbench().getActiveWorkbenchWindow()
                                                    .getShell(),
                                            DbCoreNLS.CreateDatabaseWizardPage_Table_Already_Exists_Title,
                                            NLS.bind(
                                                    DbCoreNLS.CreateDatabaseWizardPage_Table_Already_Exists_Msg,
                                                    newTable.getName()));
                        }
                    }
                }
                else
                {
                    //exit the loop if the user cancel dialog
                    break;
                }
            }

        }

        return null;
    }

    private ITableCreatorNode getSelectedItem()
    {
        ITableCreatorNode selectedNode = null;
        ITreeNode selectedItem =
                DbCoreActivator.getMOTODEVDatabaseExplorerView().getSelectedItemOnTree();

        if (selectedItem instanceof ITableCreatorNode)
        {
            selectedNode = (ITableCreatorNode) selectedItem;
        }

        return selectedNode;
    }

    private Set<String> getNotAllowedNames(List<Table> list)
    {

        Set<String> names = new HashSet<String>();

        for (Table table : list)
        {
            names.add(table.getName().toUpperCase());
        }
        return names;
    }
}