Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2006 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 descent.internal.ui.preferences; import java.lang.reflect.InvocationTargetException; import java.util.Map; import org.eclipse.core.runtime.CoreException; import org.eclipse.core.runtime.IAdaptable; import org.eclipse.core.runtime.IProgressMonitor; import org.eclipse.core.runtime.IStatus; import org.eclipse.core.runtime.OperationCanceledException; import org.eclipse.core.resources.IProject; import org.eclipse.core.resources.IWorkspaceRunnable; import org.eclipse.swt.SWT; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Control; import org.eclipse.swt.widgets.Label; import org.eclipse.jface.dialogs.Dialog; import org.eclipse.jface.dialogs.IDialogSettings; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.dialogs.ProgressMonitorDialog; import org.eclipse.jface.preference.IPreferencePageContainer; import org.eclipse.ui.PlatformUI; import org.eclipse.ui.dialogs.PropertyPage; import org.eclipse.ui.preferences.IWorkbenchPreferenceContainer; import descent.core.IClasspathEntry; import descent.core.IJavaElement; import descent.core.IJavaProject; import descent.core.JavaCore; import descent.internal.ui.IJavaHelpContextIds; import descent.internal.ui.JavaPlugin; import descent.internal.ui.actions.WorkbenchRunnableAdapter; import descent.internal.ui.dialogs.StatusUtil; import descent.internal.ui.util.BusyIndicatorRunnableContext; import descent.internal.ui.util.ExceptionHandler; import descent.internal.ui.wizards.IStatusChangeListener; import descent.internal.ui.wizards.buildpaths.BuildPathsBlock; /** * Property page for configuring the Java build path */ public class BuildPathsPropertyPage extends PropertyPage implements IStatusChangeListener { public static final String PROP_ID = "descent.ui.propertyPages.BuildPathsPropertyPage"; //$NON-NLS-1$ private static final String PAGE_SETTINGS = "BuildPathsPropertyPage"; //$NON-NLS-1$ private static final String INDEX = "pageIndex"; //$NON-NLS-1$ public static final Object DATA_ADD_ENTRY = "add_classpath_entry"; //$NON-NLS-1$ public static final Object DATA_REVEAL_ENTRY = "select_classpath_entry"; //$NON-NLS-1$ public static final Object DATA_REVEAL_ATTRIBUTE_KEY = "select_classpath_attribute_key"; //$NON-NLS-1$ public static final Object DATA_BLOCK = "block_until_buildpath_applied"; //$NON-NLS-1$ private BuildPathsBlock fBuildPathsBlock; private boolean fBlockOnApply = false; /* * @see PreferencePage#createControl(Composite) */ protected Control createContents(Composite parent) { // ensure the page has no special buttons noDefaultAndApplyButton(); IProject project = getProject(); Control result; if (project == null || !isJavaProject(project)) { result = createWithoutJava(parent); } else if (!project.isOpen()) { result = createForClosedProject(parent); } else { result = createWithJava(parent, project); } Dialog.applyDialogFont(result); return result; } /* * @see org.eclipse.jface.dialogs.IDialogPage#createControl(org.eclipse.swt.widgets.Composite) */ public void createControl(Composite parent) { super.createControl(parent); PlatformUI.getWorkbench().getHelpSystem().setHelp(getControl(), IJavaHelpContextIds.BUILD_PATH_PROPERTY_PAGE); } private IDialogSettings getSettings() { IDialogSettings javaSettings = JavaPlugin.getDefault().getDialogSettings(); IDialogSettings pageSettings = javaSettings.getSection(PAGE_SETTINGS); if (pageSettings == null) { pageSettings = javaSettings.addNewSection(PAGE_SETTINGS); pageSettings.put(INDEX, 2); } return pageSettings; } /* (non-Javadoc) * @see org.eclipse.jface.dialogs.IDialogPage#setVisible(boolean) */ public void setVisible(boolean visible) { if (fBuildPathsBlock != null) { if (!visible) { if (fBuildPathsBlock.hasChangesInDialog()) { String title = PreferencesMessages.BuildPathsPropertyPage_unsavedchanges_title; String message = PreferencesMessages.BuildPathsPropertyPage_unsavedchanges_message; String[] buttonLabels = new String[] { PreferencesMessages.BuildPathsPropertyPage_unsavedchanges_button_save, PreferencesMessages.BuildPathsPropertyPage_unsavedchanges_button_discard, PreferencesMessages.BuildPathsPropertyPage_unsavedchanges_button_ignore }; MessageDialog dialog = new MessageDialog(getShell(), title, null, message, MessageDialog.QUESTION, buttonLabels, 0); int res = dialog.open(); if (res == 0) { performOk(); } else if (res == 1) { fBuildPathsBlock.init(JavaCore.create(getProject()), null, null); } else { // keep unsaved } } } else { if (!fBuildPathsBlock.hasChangesInDialog() && fBuildPathsBlock.hasChangesInClasspathFile()) { fBuildPathsBlock.init(JavaCore.create(getProject()), null, null); } } } super.setVisible(visible); } /* * Content for valid projects. */ private Control createWithJava(Composite parent, IProject project) { IWorkbenchPreferenceContainer pageContainer = null; IPreferencePageContainer container = getContainer(); if (container instanceof IWorkbenchPreferenceContainer) { pageContainer = (IWorkbenchPreferenceContainer) container; } fBuildPathsBlock = new BuildPathsBlock(new BusyIndicatorRunnableContext(), this, getSettings().getInt(INDEX), false, pageContainer); fBuildPathsBlock.init(JavaCore.create(project), null, null); return fBuildPathsBlock.createControl(parent); } /* * Content for non-Java projects. */ private Control createWithoutJava(Composite parent) { Label label = new Label(parent, SWT.LEFT); label.setText(PreferencesMessages.BuildPathsPropertyPage_no_java_project_message); fBuildPathsBlock = null; setValid(true); return label; } /* * Content for closed projects. */ private Control createForClosedProject(Composite parent) { Label label = new Label(parent, SWT.LEFT); label.setText(PreferencesMessages.BuildPathsPropertyPage_closed_project_message); fBuildPathsBlock = null; setValid(true); return label; } private IProject getProject() { IAdaptable adaptable = getElement(); if (adaptable != null) { IJavaElement elem = (IJavaElement) adaptable.getAdapter(IJavaElement.class); if (elem instanceof IJavaProject) { return ((IJavaProject) elem).getProject(); } } return null; } private boolean isJavaProject(IProject proj) { try { return proj.hasNature(JavaCore.NATURE_ID); } catch (CoreException e) { JavaPlugin.log(e); } return false; } /* * @see IPreferencePage#performOk */ public boolean performOk() { if (fBuildPathsBlock != null) { getSettings().put(INDEX, fBuildPathsBlock.getPageIndex()); if (fBuildPathsBlock.hasChangesInDialog()) { IWorkspaceRunnable runnable = new IWorkspaceRunnable() { public void run(IProgressMonitor monitor) throws CoreException, OperationCanceledException { fBuildPathsBlock.configureJavaProject(monitor); } }; WorkbenchRunnableAdapter op = new WorkbenchRunnableAdapter(runnable); if (fBlockOnApply) { try { new ProgressMonitorDialog(getShell()).run(true, true, op); } catch (InvocationTargetException e) { ExceptionHandler.handle(e, getShell(), PreferencesMessages.BuildPathsPropertyPage_error_title, PreferencesMessages.BuildPathsPropertyPage_error_message); return false; } catch (InterruptedException e) { return false; } } else { op.runAsUserJob(PreferencesMessages.BuildPathsPropertyPage_job_title, null); } } } return true; } /* (non-Javadoc) * @see IStatusChangeListener#statusChanged */ public void statusChanged(IStatus status) { setValid(!status.matches(IStatus.ERROR)); StatusUtil.applyToStatusLine(this, status); } /* (non-Javadoc) * @see org.eclipse.jface.preference.PreferencePage#applyData(java.lang.Object) */ public void applyData(Object data) { if (data instanceof Map) { Map map = (Map) data; Object selectedLibrary = map.get(DATA_REVEAL_ENTRY); if (selectedLibrary instanceof IClasspathEntry) { IClasspathEntry entry = (IClasspathEntry) selectedLibrary; Object attr = map.get(DATA_REVEAL_ATTRIBUTE_KEY); String attributeKey = attr instanceof String ? (String) attr : null; if (fBuildPathsBlock != null) { fBuildPathsBlock.setElementToReveal(entry, attributeKey); } } Object entryToAdd = map.get(DATA_ADD_ENTRY); if (entryToAdd instanceof IClasspathEntry) { if (fBuildPathsBlock != null) { fBuildPathsBlock.addElement((IClasspathEntry) entryToAdd); } } fBlockOnApply = Boolean.TRUE.equals(map.get(DATA_BLOCK)); } } }