org.eclipse.scada.ca.ui.exporter.wizard.FileNamePage.java Source code

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Here is the source code for org.eclipse.scada.ca.ui.exporter.wizard.FileNamePage.java

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/*******************************************************************************
 * Copyright (c) 2010, 2011 TH4 SYSTEMS GmbH and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     TH4 SYSTEMS GmbH - initial API and implementation
 *******************************************************************************/
package org.eclipse.scada.ca.ui.exporter.wizard;

import java.io.File;

import org.eclipse.jface.dialogs.IMessageProvider;
import org.eclipse.jface.wizard.WizardPage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;

public class FileNamePage extends WizardPage {

    private Text fileName;

    public FileNamePage() {
        super("fileNamePage"); //$NON-NLS-1$
    }

    public void createControl(final Composite parent) {
        setDescription(Messages.FileNamePage_Description);

        final Composite wrapper = new Composite(parent, SWT.NONE);
        wrapper.setLayout(new GridLayout(3, false));

        Label label;

        label = new Label(wrapper, SWT.NONE);
        label.setText(Messages.FileNamePage_FileLabel);

        this.fileName = new Text(wrapper, SWT.BORDER);
        this.fileName.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
        final String file = getWizard().getDialogSettings().get("fileNamePage.file"); //$NON-NLS-1$
        if (file != null) {
            this.fileName.setText(file);
        }
        this.fileName.addModifyListener(new ModifyListener() {

            public void modifyText(final ModifyEvent e) {
                update();
            }
        });

        final Button selectFile = new Button(wrapper, SWT.PUSH);
        selectFile.setText(Messages.FileNamePage_BrowseLabel);
        selectFile.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(final SelectionEvent e) {
                handleSelectFile();
            }
        });

        setControl(wrapper);

        update();
    }

    protected void update() {
        try {
            validate();
            setMessage(null, IMessageProvider.NONE);
            setPageComplete(true);
        } catch (final Exception e) {
            setMessage(e.getLocalizedMessage(), IMessageProvider.ERROR);
            setPageComplete(false);
        }
    }

    private void validate() throws Exception {
        final String fileName = this.fileName.getText();

        if (fileName.length() == 0) {
            throw new IllegalStateException(Messages.FileNamePage_State_NotFileSelected);
        }

        final File file = new File(fileName);

        if (file.exists() && !file.isFile()) {
            throw new IllegalArgumentException(String.format(Messages.FileNamePage_State_FileNoFile, fileName));
        }
        if (!file.canWrite() && file.exists()) {
            throw new IllegalArgumentException(String.format(Messages.FileNamePage_State_FileCantWrite, fileName));
        }
    }

    protected void handleSelectFile() {
        final FileDialog dlg = new FileDialog(getShell(), SWT.SAVE);
        dlg.setFilterExtensions(new String[] { "*.oscar", "*.*" }); //$NON-NLS-1$ //$NON-NLS-2$ 
        dlg.setFilterNames(new String[] { Messages.FileNamePage_OSCARFileType, Messages.FileNamePage_AllTypes });

        if (this.fileName.getText().length() > 0) {
            dlg.setFileName(this.fileName.getText());
        }
        dlg.setFilterIndex(0);

        final String file = dlg.open();
        if (file != null) {
            this.fileName.setText(file);
            getWizard().getDialogSettings().put("fileNamePage.file", file); //$NON-NLS-1$
        }
    }

    public File getFile() {
        return new File(this.fileName.getText());
    }

}