core/plugins/org.eclipse.dltk.ui/src/org/eclipse/dltk/internal/ui/dialogs/MethodSelectionDialog2.java

/*******************************************************************************
 * Copyright (c) 2000, 2017 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
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.ui.dialogs;

import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.SubProgressMonitor;
import org.eclipse.core.runtime.jobs.IJobManager;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.dltk.core.IMethod;
import org.eclipse.dltk.core.IProjectFragment;
import org.eclipse.dltk.core.ISourceModule;
import org.eclipse.dltk.core.ModelException;
import org.eclipse.dltk.core.search.IDLTKSearchConstants;
import org.eclipse.dltk.core.search.IDLTKSearchScope;
import org.eclipse.dltk.core.search.MethodNameMatch;
import org.eclipse.dltk.core.search.NopTypeNameRequestor;
import org.eclipse.dltk.core.search.SearchEngine;
import org.eclipse.dltk.core.search.SearchPattern;
import org.eclipse.dltk.internal.corext.util.Messages;
import org.eclipse.dltk.internal.corext.util.OpenMethodHistory;
import org.eclipse.dltk.internal.ui.DLTKUIMessages;
import org.eclipse.dltk.ui.DLTKUIPlugin;
import org.eclipse.dltk.ui.IDLTKUILanguageToolkit;
import org.eclipse.dltk.ui.ScriptElementLabels;
import org.eclipse.dltk.ui.dialogs.TypeSelectionExtension;
import org.eclipse.dltk.ui.util.ExceptionHandler;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.operation.IRunnableContext;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.dialogs.SelectionStatusDialog;

public class MethodSelectionDialog2 extends SelectionStatusDialog {

	private String fTitle;

	private boolean fMultipleSelection;
	private IRunnableContext fRunnableContext;
	private IDLTKSearchScope fScope;
	private int fElementKind;

	private String fInitialFilter;
	private int fSelectionMode;
	private MethodSelectionComponent fContent;

	public static final int NONE = MethodSelectionComponent.NONE;
	public static final int CARET_BEGINNING = MethodSelectionComponent.CARET_BEGINNING;
	public static final int FULL_SELECTION = MethodSelectionComponent.FULL_SELECTION;

	private static boolean fgFirstTime = true;

	private IDLTKUILanguageToolkit fToolkit;

	private class TitleLabel implements MethodSelectionComponent.ITitleLabel {
		@Override
		public void setText(String text) {
			if (text == null || text.length() == 0) {
				getShell().setText(fTitle);
			} else {
				getShell()
						.setText(
								Messages
										.format(
												DLTKUIMessages.TypeSelectionDialog2_title_format,
												new String[] { fTitle, text }));
			}
		}
	}

	public MethodSelectionDialog2(Shell parent, boolean multi,
			IRunnableContext context, IDLTKSearchScope scope, int elementKinds,
			IDLTKUILanguageToolkit toolkit) {
		this(parent, multi, context, scope, elementKinds, null, toolkit);
	}

	public MethodSelectionDialog2(Shell parent, boolean multi,
			IRunnableContext context, IDLTKSearchScope scope, int elementKinds,
			TypeSelectionExtension extension, IDLTKUILanguageToolkit toolkit) {
		super(parent);
		setShellStyle(getShellStyle() | SWT.RESIZE);
		fMultipleSelection = multi;
		fRunnableContext = context;
		fScope = scope;
		fElementKind = elementKinds;
		fSelectionMode = NONE;
		this.fToolkit = toolkit;
	}

	public void setFilter(String filter) {
		setFilter(filter, FULL_SELECTION);
	}

	public void setFilter(String filter, int selectionMode) {
		fInitialFilter = filter;
		fSelectionMode = selectionMode;
	}

	protected MethodNameMatch[] getSelectedTypes() {
		if (fContent == null || fContent.isDisposed())
			return null;
		return fContent.getSelection();
	}

	@Override
	public void create() {
		super.create();
		fContent.populate(fSelectionMode);
		getOkButton().setEnabled(fContent.getSelection().length > 0);
	}

	@Override
	protected void configureShell(Shell shell) {
		super.configureShell(shell);
		// PlatformUI.getWorkbench().getHelpSystem().setHelp(shell,
		// IJavaHelpContextIds.TYPE_SELECTION_DIALOG2);
	}

	@Override
	protected Control createDialogArea(Composite parent) {
		Composite area = (Composite) super.createDialogArea(parent);
		fContent = new MethodSelectionComponent(area, SWT.NONE, getMessage(),
				fMultipleSelection, fScope, fElementKind, fInitialFilter,
				new TitleLabel(), this.fToolkit);
		GridData gd = new GridData(GridData.FILL_BOTH);
		fContent.setLayoutData(gd);
		fContent.addSelectionListener(new SelectionListener() {
			@Override
			public void widgetDefaultSelected(SelectionEvent e) {
				handleDefaultSelected(fContent.getSelection());
			}

			@Override
			public void widgetSelected(SelectionEvent e) {
				handleWidgetSelected(fContent.getSelection());
			}
		});
		return area;
	}

	protected void handleDefaultSelected(MethodNameMatch[] selection) {
		if (selection.length == 0)
			return;
		okPressed();
	}

	protected void handleWidgetSelected(MethodNameMatch[] selection) {
		IStatus status = null;
		if (selection.length == 0) {
			status = new Status(IStatus.ERROR, DLTKUIPlugin.getPluginId(),
					IStatus.ERROR, "", null); //$NON-NLS-1$
		} else {
			status = new Status(IStatus.OK, DLTKUIPlugin.getPluginId(),
					IStatus.OK, "", null); //$NON-NLS-1$
		}
		updateStatus(status);
	}

	@Override
	public int open() {
		try {
			ensureConsistency();
		} catch (InvocationTargetException e) {
			ExceptionHandler.handle(e,
					DLTKUIMessages.TypeSelectionDialog_error3Title,
					DLTKUIMessages.TypeSelectionDialog_error3Message);
			return CANCEL;
		} catch (InterruptedException e) {
			// cancelled by user
			return CANCEL;
		}
		if (fInitialFilter == null) {
			IWorkbenchWindow window = DLTKUIPlugin.getActiveWorkbenchWindow();
			if (window != null) {
				ISelection selection = window.getSelectionService()
						.getSelection();
				if (selection instanceof ITextSelection) {
					String text = ((ITextSelection) selection).getText();
					if (text != null) {
						text = text.trim();
						if (text.length() > 0) {
							/*
							 * TODO: Add validate source type call
							 */
							fInitialFilter = text;
							fSelectionMode = FULL_SELECTION;
						}
					}
				}
			}
		}
		return super.open();
	}

	@Override
	public boolean close() {
		boolean result;
		try {
			if (getReturnCode() == OK) {
				OpenMethodHistory.getInstance(this.fToolkit).save();
			}
		} finally {
			result = super.close();
		}
		return result;
	}

	@Override
	public void setTitle(String title) {
		super.setTitle(title);
		fTitle = title;
	}

	@Override
	protected void computeResult() {
		MethodNameMatch[] selected = fContent.getSelection();
		if (selected == null || selected.length == 0) {
			setResult(null);
			return;
		}

		// If the scope is null then it got computed by the type selection
		// component.
		if (fScope == null) {
			fScope = fContent.getScope();
		}

		OpenMethodHistory history = OpenMethodHistory
				.getInstance(this.fToolkit);
		List result = new ArrayList(selected.length);
		for (int i = 0; i < selected.length; i++) {
			MethodNameMatch typeInfo = selected[i];
			IMethod type = typeInfo.getMethod();
			if (!type.exists()) {
				ISourceModule module = type.getSourceModule();
				if (module.exists()) {
					result.add(module);
				} else {
					String title = DLTKUIMessages.TypeSelectionDialog_errorTitle;
					IProjectFragment root = typeInfo.getProjectFragment();
					ScriptElementLabels labels = this.fToolkit
							.getScriptElementLabels();
					String containerName = labels.getElementLabel(root,
							ScriptElementLabels.ROOT_QUALIFIED);
					String message = Messages.format(
							DLTKUIMessages.TypeSelectionDialog_dialogMessage,
							new String[] { typeInfo.getFullyQualifiedName(),
									containerName });
					MessageDialog.openError(getShell(), title, message);
					history.remove(typeInfo);
					setResult(null);
				}
			} else {
				history.accessed(typeInfo);
				result.add(type);
			}
		}
		setResult(result);
	}

	private void ensureConsistency() throws InvocationTargetException,
			InterruptedException {
		// we only have to ensure history consistency here since the search
		// engine
		// takes care of working copies.
		class ConsistencyRunnable implements IRunnableWithProgress {
			@Override
			public void run(IProgressMonitor monitor)
					throws InvocationTargetException, InterruptedException {
				if (fgFirstTime) {
					// Join the initialize after load job.
					IJobManager manager = Job.getJobManager();
					manager.join(DLTKUIPlugin.PLUGIN_ID, monitor);
				}
				OpenMethodHistory history = OpenMethodHistory
						.getInstance(fToolkit);
				if (fgFirstTime || history.isEmpty()) {
					monitor
							.beginTask(
									DLTKUIMessages.TypeSelectionDialog_progress_consistency,
									100);
					if (history.needConsistencyCheck()) {
						refreshSearchIndices(new SubProgressMonitor(monitor, 90));
						history.checkConsistency(new SubProgressMonitor(
								monitor, 10));
					} else {
						refreshSearchIndices(monitor);
					}
					monitor.done();
					fgFirstTime = false;
				} else {
					history.checkConsistency(monitor);
				}
			}

			public boolean needsExecution() {
				OpenMethodHistory history = OpenMethodHistory
						.getInstance(fToolkit);
				return fgFirstTime || history.isEmpty()
						|| history.needConsistencyCheck();
			}

			private void refreshSearchIndices(IProgressMonitor monitor)
					throws InvocationTargetException {
				try {
					new SearchEngine().searchAllTypeNames(
							null,
							0, // make sure we search a concrete name. This is
							// faster according to Kent
							"_______________".toCharArray(), //$NON-NLS-1$
							SearchPattern.R_EXACT_MATCH
									| SearchPattern.R_CASE_SENSITIVE,
							IDLTKSearchConstants.FIELD, SearchEngine
									.createWorkspaceScope(fToolkit
											.getCoreToolkit()),
							new NopTypeNameRequestor(),
							IDLTKSearchConstants.WAIT_UNTIL_READY_TO_SEARCH,
							monitor);
				} catch (ModelException e) {
					throw new InvocationTargetException(e);
				}
			}
		}
		ConsistencyRunnable runnable = new ConsistencyRunnable();
		if (!runnable.needsExecution())
			return;
		IRunnableContext context = fRunnableContext != null ? fRunnableContext
				: PlatformUI.getWorkbench().getProgressService();
		context.run(true, true, runnable);
	}
}