MtextNewFileWizardPage.java

/**
 * <copyright>
 * </copyright>
 *
 * 
 */
package org.feature.multi.perspective.mapping.viewmapping.resource.mtext.ui;

/**
 * The NewFileWizardPage allows setting the container for the new file, as well as
 * the file name. The page will only accept file names without extension OR with
 * an extension that matches the expected one.
 */
public class MtextNewFileWizardPage extends org.eclipse.jface.wizard.WizardPage {
	
	private final String fileExtension;
	private org.eclipse.swt.widgets.Text containerText;
	private org.eclipse.swt.widgets.Text fileText;
	private org.eclipse.jface.viewers.ISelection selection;
	
	/**
	 * Constructor for the NewFileWizardPage.
	 */
	public MtextNewFileWizardPage(org.eclipse.jface.viewers.ISelection selection, String fileExtension) {
		super("wizardPage");
		setTitle("Create new mtext file");
		setDescription("This wizard creates a new file with *." + fileExtension + " extension that can be opened with the EMFText editor.");
		this.selection = selection;
		this.fileExtension = fileExtension;
	}
	
	/**
	 * 
	 * @see IDialogPage#createControl(org.eclipse.swt.widgets.Composite)
	 */
	public void createControl(org.eclipse.swt.widgets.Composite parent) {
		org.eclipse.swt.widgets.Composite container = new org.eclipse.swt.widgets.Composite(parent, org.eclipse.swt.SWT.NULL);
		org.eclipse.swt.layout.GridLayout layout = new org.eclipse.swt.layout.GridLayout();
		container.setLayout(layout);
		layout.numColumns = 3;
		layout.verticalSpacing = 9;
		org.eclipse.swt.widgets.Label label = new org.eclipse.swt.widgets.Label(container, org.eclipse.swt.SWT.NULL);
		label.setText("&Container:");
		
		containerText = new org.eclipse.swt.widgets.Text(container, org.eclipse.swt.SWT.BORDER | org.eclipse.swt.SWT.SINGLE);
		org.eclipse.swt.layout.GridData gd = new org.eclipse.swt.layout.GridData(org.eclipse.swt.layout.GridData.FILL_HORIZONTAL);
		containerText.setLayoutData(gd);
		containerText.addModifyListener(new org.eclipse.swt.events.ModifyListener() {
			public void modifyText(org.eclipse.swt.events.ModifyEvent e) {
				dialogChanged();
			}
		});
		
		org.eclipse.swt.widgets.Button button = new org.eclipse.swt.widgets.Button(container, org.eclipse.swt.SWT.PUSH);
		button.setText("Browse...");
		button.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
			public void widgetSelected(org.eclipse.swt.events.SelectionEvent e) {
				handleBrowse();
			}
		});
		label = new org.eclipse.swt.widgets.Label(container, org.eclipse.swt.SWT.NULL);
		label.setText("&File name:");
		
		fileText = new org.eclipse.swt.widgets.Text(container, org.eclipse.swt.SWT.BORDER | org.eclipse.swt.SWT.SINGLE);
		gd = new org.eclipse.swt.layout.GridData(org.eclipse.swt.layout.GridData.FILL_HORIZONTAL);
		fileText.setLayoutData(gd);
		fileText.addModifyListener(new org.eclipse.swt.events.ModifyListener() {
			public void modifyText(org.eclipse.swt.events.ModifyEvent e) {
				dialogChanged();
			}
		});
		initialize();
		dialogChanged();
		setControl(container);
	}
	
	/**
	 * Tests if the current workbench selection is a suitable container to use.
	 */
	private void initialize() {
		String name = "new_file";
		if (selection != null && selection.isEmpty() == false		&& selection instanceof org.eclipse.jface.viewers.IStructuredSelection) {
			org.eclipse.jface.viewers.IStructuredSelection ssel = (org.eclipse.jface.viewers.IStructuredSelection) selection;
			if (ssel.size() > 1)			return;
			Object obj = ssel.getFirstElement();
			// test for IAdaptable
			if ((! (obj instanceof org.eclipse.core.resources.IResource)) && (obj instanceof org.eclipse.core.runtime.IAdaptable)) {
				obj = (org.eclipse.core.resources.IResource) ((org.eclipse.core.runtime.IAdaptable) obj).getAdapter(org.eclipse.core.resources.IResource.class);
			}
			if (obj instanceof org.eclipse.core.resources.IResource) {
				org.eclipse.core.resources.IContainer container;
				if (obj instanceof org.eclipse.core.resources.IContainer) {
					container = (org.eclipse.core.resources.IContainer) obj;
				} else {
					org.eclipse.core.resources.IResource resource = (org.eclipse.core.resources.IResource) obj;
					container = resource.getParent();
					// we use the name of the currently selected file instead of 'new_file'.
					name = resource.getFullPath().removeFileExtension().lastSegment();
				}
				org.eclipse.core.runtime.IPath fullPath = container.getFullPath();
				containerText.setText(fullPath.toString());
			}
		}
		fileText.setText(name + "." + fileExtension);
	}
	
	/**
	 * Uses the standard container selection dialog to choose the new value for the
	 * container field.
	 */
	private void handleBrowse() {
		org.eclipse.ui.dialogs.ContainerSelectionDialog dialog = new org.eclipse.ui.dialogs.ContainerSelectionDialog(		getShell(), org.eclipse.core.resources.ResourcesPlugin.getWorkspace().getRoot(), false,
		"Select new file container");
		if (dialog.open() == org.eclipse.ui.dialogs.ContainerSelectionDialog.OK) {
			Object[] result = dialog.getResult();
			if (result.length == 1) {
				containerText.setText(((org.eclipse.core.runtime.Path) result[0]).toString());
			}
		}
	}
	
	/**
	 * Ensures that both text fields are set.
	 */
	private void dialogChanged() {
		org.eclipse.core.resources.IResource container = org.eclipse.core.resources.ResourcesPlugin.getWorkspace().getRoot().findMember(new org.eclipse.core.runtime.Path(getContainerName()));
		String fileName = getFileName();
		
		if (getContainerName().length() == 0) {
			updateStatus("File container must be specified");
			return;
		}
		if (container == null || (container.getType() & (org.eclipse.core.resources.IResource.PROJECT | org.eclipse.core.resources.IResource.FOLDER)) == 0) {
			updateStatus("File container must exist");
			return;
		}
		if (!container.isAccessible()) {
			updateStatus("Project must be writable");
			return;
		}
		if (fileName.length() == 0) {
			updateStatus("File name must be specified");
			return;
		}
		if (fileName.replace('\\', '/').indexOf('/', 1) > 0) {
			updateStatus("File name must be valid");
			return;
		}
		if (!fileName.endsWith("." + fileExtension)) {
			updateStatus("File extension must be \"" + fileExtension + "\"");
			return;
		}
		updateStatus(null);
	}
	
	private void updateStatus(String message) {
		setErrorMessage(message);
		setPageComplete(message == null);
	}
	
	public String getContainerName() {
		return containerText.getText();
	}
	
	public String getFileName() {
		return fileText.getText();
	}
}