Java tutorial
/******************************************************************************* * Copyright (c) 2005, 2009 IBM Corporation 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: * IBM Corporation - initial API and implementation *******************************************************************************/ package org.eclipse.ui.internal.wizards.preferences; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import org.eclipse.core.runtime.CoreException; import org.eclipse.core.runtime.Platform; import org.eclipse.core.runtime.preferences.IExportedPreferences; import org.eclipse.core.runtime.preferences.IPreferenceFilter; import org.eclipse.core.runtime.preferences.IPreferencesService; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.swt.SWT; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Event; import org.eclipse.ui.internal.WorkbenchPlugin; import org.eclipse.ui.internal.preferences.PreferenceTransferElement; /** * Page 1 of the base preference import Wizard * * * @since 3.1 */ public class WizardPreferencesImportPage1 extends WizardPreferencesPage { /** * Create a new instance of the receiver with name pageName. * @param pageName */ protected WizardPreferencesImportPage1(String pageName) { super(pageName); setTitle(PreferencesMessages.WizardPreferencesImportPage1_importTitle); setDescription(PreferencesMessages.WizardPreferencesImportPage1_importDescription); } /** * Create an instance of this class */ public WizardPreferencesImportPage1() { this("preferencesImportPage1");//$NON-NLS-1$ } /* (non-Javadoc) * @see org.eclipse.ui.internal.wizards.preferences.WizardPreferencesPage#getAllButtonText() */ protected String getAllButtonText() { return PreferencesMessages.WizardPreferencesImportPage1_all; } /* (non-Javadoc) * @see org.eclipse.ui.internal.wizards.preferences.WizardPreferencesPage#getChooseButtonText() */ protected String getChooseButtonText() { return PreferencesMessages.WizardPreferencesImportPage1_choose; } /* (non-Javadoc) * @see org.eclipse.ui.internal.wizards.preferences.WizardPreferencesPage#getTransfers() */ protected PreferenceTransferElement[] getTransfers() { if (validFromFile()) { FileInputStream fis; try { fis = new FileInputStream(getDestinationValue()); } catch (FileNotFoundException e) { WorkbenchPlugin.log(e.getMessage(), e); return new PreferenceTransferElement[0]; } IPreferencesService service = Platform.getPreferencesService(); try { IExportedPreferences prefs; prefs = service.readPreferences(fis); PreferenceTransferElement[] transfers = super.getTransfers(); IPreferenceFilter[] filters = new IPreferenceFilter[transfers.length]; for (int i = 0; i < transfers.length; i++) { PreferenceTransferElement transfer = transfers[i]; filters[i] = transfer.getFilter(); } IPreferenceFilter[] matches = service.matches(prefs, filters); PreferenceTransferElement[] returnTransfers = new PreferenceTransferElement[matches.length]; int index = 0; for (int i = 0; i < matches.length; i++) { IPreferenceFilter filter = matches[i]; for (int j = 0; j < transfers.length; j++) { PreferenceTransferElement element = transfers[j]; if (element.getFilter().equals(filter)) { returnTransfers[index++] = element; } } } PreferenceTransferElement[] destTransfers = new PreferenceTransferElement[index]; System.arraycopy(returnTransfers, 0, destTransfers, 0, index); return destTransfers; } catch (CoreException e) { //Do not log core exceptions, they indicate the chosen file is not valid //WorkbenchPlugin.log(e.getMessage(), e); } finally { try { fis.close(); } catch (IOException e) { WorkbenchPlugin.log(e.getMessage(), e); } } } return new PreferenceTransferElement[0]; } /** * Return whether or not the file is valid. * @return <code>true</code> of the file is an existing * file and not a directory */ private boolean validFromFile() { File fromFile = new File(getDestinationValue()); return fromFile.exists() && !fromFile.isDirectory(); } protected void setPreferenceTransfers() { super.setPreferenceTransfers(); if (validFromFile() && (transfersTree.getViewer().getTree().getItemCount() == 0)) { descText.setText(PreferencesMessages.WizardPreferences_noSpecificPreferenceDescription); } else { descText.setText(""); //$NON-NLS-1$ } } /* (non-Javadoc) * @see org.eclipse.ui.internal.wizards.preferences.WizardPreferencesPage#createTransferArea(org.eclipse.swt.widgets.Composite) */ protected void createTransferArea(Composite composite) { createDestinationGroup(composite); createTransfersList(composite); } /** * Answer the string to display in self as the destination type * * @return java.lang.String */ protected String getDestinationLabel() { return PreferencesMessages.WizardPreferencesImportPage1_file; } /** * @param filters * @return <code>true</code> if the transfer was succesful, and * <code>false</code> otherwise */ protected boolean transfer(IPreferenceFilter[] filters) { File importFile = new File(getDestinationValue()); FileInputStream fis = null; try { if (filters.length > 0) { try { fis = new FileInputStream(importFile); } catch (FileNotFoundException e) { WorkbenchPlugin.log(e.getMessage(), e); MessageDialog.open(MessageDialog.ERROR, getControl().getShell(), new String(), e.getLocalizedMessage(), SWT.SHEET); return false; } IPreferencesService service = Platform.getPreferencesService(); try { IExportedPreferences prefs = service.readPreferences(fis); service.applyPreferences(prefs, filters); } catch (CoreException e) { WorkbenchPlugin.log(e.getMessage(), e); MessageDialog.open(MessageDialog.ERROR, getControl().getShell(), new String(), e.getLocalizedMessage(), SWT.SHEET); return false; } } } finally { if (fis != null) { try { fis.close(); } catch (IOException e) { WorkbenchPlugin.log(e.getMessage(), e); MessageDialog.open(MessageDialog.ERROR, getControl().getShell(), new String(), e.getLocalizedMessage(), SWT.SHEET); } } } return true; } /** * Handle events and enablements for widgets in this page * * @param e * Event */ public void handleEvent(Event e) { if (e.widget == destinationNameField) { setPreferenceTransfers(); } super.handleEvent(e); } /* (non-Javadoc) * @see org.eclipse.ui.internal.wizards.preferences.WizardPreferencesPage#getFileDialogTitle() */ protected String getFileDialogTitle() { return PreferencesMessages.WizardPreferencesImportPage1_title; } /* (non-Javadoc) * @see org.eclipse.ui.internal.wizards.preferences.WizardPreferencesPage#getFileDialogStyle() */ protected int getFileDialogStyle() { return SWT.OPEN | SWT.SHEET; } /* (non-Javadoc) * @see org.eclipse.ui.internal.wizards.preferences.WizardPreferencesPage#validDestination() */ protected boolean validDestination() { return super.validDestination() && validFromFile(); } /* (non-Javadoc) * @see org.eclipse.ui.internal.wizards.preferences.WizardPreferencesPage#getInvalidDestinationMessage() */ protected String getInvalidDestinationMessage() { return PreferencesMessages.WizardPreferencesImportPage1_invalidPrefFile; } /* * (non-Javadoc) * * @seeorg.eclipse.ui.internal.wizards.preferences.WizardPreferencesPage# * shouldSaveTransferAll() */ protected boolean shouldSaveTransferAll() { return false; } }