core/plugins/org.eclipse.dltk.ui/src/org/eclipse/dltk/internal/ui/wizards/buildpath/VariableBlock.java - dltk/org.eclipse.dltk.core - Git at Google

 /*******************************************************************************
  * Copyright (c) 2000, 2017 IBM Corporation and others.
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
  * http://www.eclipse.org/legal/epl-2.0.
  *
  * SPDX-License-Identifier: EPL-2.0
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.dltk.internal.ui.wizards.buildpath;

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

 import org.eclipse.core.resources.ResourcesPlugin;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IPath;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.OperationCanceledException;
 import org.eclipse.core.runtime.SubProgressMonitor;
 import org.eclipse.dltk.core.DLTKCore;
 import org.eclipse.dltk.core.IBuildpathEntry;
 import org.eclipse.dltk.core.IScriptModel;
 import org.eclipse.dltk.core.IScriptProject;
 import org.eclipse.dltk.core.ModelException;
 import org.eclipse.dltk.internal.ui.util.CoreUtility;
 import org.eclipse.dltk.internal.ui.wizards.NewWizardMessages;
 import org.eclipse.dltk.internal.ui.wizards.dialogfields.DialogField;
 import org.eclipse.dltk.internal.ui.wizards.dialogfields.IDialogFieldListener;
 import org.eclipse.dltk.internal.ui.wizards.dialogfields.IListAdapter;
 import org.eclipse.dltk.internal.ui.wizards.dialogfields.LayoutUtil;
 import org.eclipse.dltk.internal.ui.wizards.dialogfields.ListDialogField;
 import org.eclipse.dltk.ui.DLTKUIPlugin;
 import org.eclipse.dltk.ui.util.ExceptionHandler;
 import org.eclipse.jface.dialogs.IDialogConstants;
 import org.eclipse.jface.dialogs.MessageDialog;
 import org.eclipse.jface.dialogs.ProgressMonitorDialog;
 import org.eclipse.jface.operation.IRunnableWithProgress;
 import org.eclipse.jface.viewers.IDoubleClickListener;
 import org.eclipse.jface.viewers.ISelection;
 import org.eclipse.jface.viewers.ISelectionChangedListener;
 import org.eclipse.jface.viewers.StructuredSelection;
 import org.eclipse.jface.window.Window;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.custom.CLabel;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.swt.widgets.Control;
 import org.eclipse.swt.widgets.Shell;

 public class VariableBlock {

 	private final ListDialogField fVariablesList;
 	private Control fControl;
 	private CLabel fWarning;
 	private boolean fHasChanges;

 	private List fSelectedElements;
 	private boolean fAskToBuild;
 	private final boolean fEditOnDoubleclick;

 	public VariableBlock(boolean inPreferencePage, String initSelection) {

 		fSelectedElements = new ArrayList(0);
 		fEditOnDoubleclick = inPreferencePage;
 		fAskToBuild = true;

 		String[] buttonLabels = new String[] {
 				NewWizardMessages.VariableBlock_vars_add_button,
 				NewWizardMessages.VariableBlock_vars_edit_button,
 				NewWizardMessages.VariableBlock_vars_remove_button };

 		VariablesAdapter adapter = new VariablesAdapter();

 		BPVariableElementLabelProvider labelProvider = new BPVariableElementLabelProvider(
 				inPreferencePage);

 		fVariablesList = new ListDialogField(adapter, buttonLabels,
 				labelProvider);
 		fVariablesList.setDialogFieldListener(adapter);
 		fVariablesList.setLabelText(NewWizardMessages.VariableBlock_vars_label);
 		fVariablesList.setRemoveButtonIndex(2);

 		fVariablesList.enableButton(1, false);

 		// TODO: create a sorter or modify ListDialogField to work with
 		// comparators
 		// fVariablesList.setViewerComparator(new ViewerComparator() {
 		// public int compare(Viewer viewer, Object e1, Object e2) {
 		// if (e1 instanceof BPVariableElement
 		// && e2 instanceof BPVariableElement) {
 		// return getComparator().compare(
 		// ((BPVariableElement) e1).getName(),
 		// ((BPVariableElement) e2).getName());
 		// }
 		// return super.compare(viewer, e1, e2);
 		// }
 		// });
 		refresh(initSelection);
 	}

 	public boolean hasChanges() {
 		return fHasChanges;
 	}

 	public void setChanges(boolean hasChanges) {
 		fHasChanges = hasChanges;
 	}

 	public Control createContents(Composite parent) {
 		Composite composite = new Composite(parent, SWT.NONE);
 		composite.setFont(parent.getFont());

 		LayoutUtil.doDefaultLayout(composite,
 				new DialogField[] { fVariablesList }, true, 0, 0);
 		LayoutUtil.setHorizontalGrabbing(fVariablesList.getListControl(null));

 		fWarning = new CLabel(composite, SWT.NONE);
 		fWarning.setLayoutData(new GridData(SWT.FILL, SWT.TOP, true, false,
 				fVariablesList.getNumberOfControls() - 1, 1));

 		fControl = composite;

 		return composite;
 	}

 	public void addDoubleClickListener(IDoubleClickListener listener) {
 		fVariablesList.getTableViewer().addDoubleClickListener(listener);
 	}

 	public void addSelectionChangedListener(ISelectionChangedListener listener) {
 		fVariablesList.getTableViewer().addSelectionChangedListener(listener);
 	}

 	private Shell getShell() {
 		if (fControl != null) {
 			return fControl.getShell();
 		}
 		return DLTKUIPlugin.getActiveWorkbenchShell();
 	}

 	private class VariablesAdapter implements IDialogFieldListener,
 			IListAdapter {

 		// -------- IListAdapter --------

 		@Override
 		public void customButtonPressed(ListDialogField field, int index) {
 			switch (index) {
 			case 0: /* add */
 				editEntries(null);
 				break;
 			case 1: /* edit */
 				List selected = field.getSelectedElements();
 				editEntries((BPVariableElement) selected.get(0));
 				break;
 			}
 		}

 		@Override
 		public void selectionChanged(ListDialogField field) {
 			doSelectionChanged(field);
 		}

 		@Override
 		public void doubleClicked(ListDialogField field) {
 			if (fEditOnDoubleclick) {
 				List selected = field.getSelectedElements();
 				if (canEdit(selected, containsReadOnly(selected))) {
 					editEntries((BPVariableElement) selected.get(0));
 				}
 			}
 		}

 		// ---------- IDialogFieldListener --------

 		@Override
 		public void dialogFieldChanged(DialogField field) {
 		}

 	}

 	private boolean containsReadOnly(List selected) {
 		for (int i = selected.size() - 1; i >= 0; i--) {
 			if (((BPVariableElement) selected.get(i)).isReadOnly()) {
 				return true;
 			}
 		}
 		return false;
 	}

 	private boolean canEdit(List selected, boolean containsReadOnly) {
 		return selected.size() == 1 && !containsReadOnly;
 	}

 	/**
 	 * @param field
 	 *            the dialog field
 	 */
 	private void doSelectionChanged(DialogField field) {
 		List selected = fVariablesList.getSelectedElements();
 		boolean containsReadOnly = containsReadOnly(selected);

 		// edit
 		fVariablesList.enableButton(1, canEdit(selected, containsReadOnly));
 		// remove button
 		fVariablesList.enableButton(2, !containsReadOnly);

 		fSelectedElements = selected;
 	}

 	private void editEntries(BPVariableElement entry) {
 		List existingEntries = fVariablesList.getElements();

 		VariableCreationDialog dialog = new VariableCreationDialog(getShell(),
 				entry, existingEntries);
 		if (dialog.open() != Window.OK) {
 			return;
 		}
 		BPVariableElement newEntry = dialog.getBuildpathElement();
 		if (entry == null) {
 			fVariablesList.addElement(newEntry);
 			entry = newEntry;
 			fHasChanges = true;
 		} else {
 			boolean hasChanges = !(entry.getName().equals(newEntry.getName()) && entry
 					.getPath().equals(newEntry.getPath()));
 			if (hasChanges) {
 				fHasChanges = true;
 				entry.setName(newEntry.getName());
 				entry.setPath(newEntry.getPath());
 				fVariablesList.refresh();
 			}
 		}
 		fVariablesList.selectElements(new StructuredSelection(entry));
 	}

 	public List getSelectedElements() {
 		return fSelectedElements;
 	}

 	public boolean performOk() {
 		ArrayList removedVariables = new ArrayList();
 		ArrayList changedVariables = new ArrayList();
 		removedVariables.addAll(Arrays.asList(DLTKCore
 				.getBuildpathVariableNames()));

 		// remove all unchanged
 		List changedElements = fVariablesList.getElements();
 		for (int i = changedElements.size() - 1; i >= 0; i--) {
 			BPVariableElement curr = (BPVariableElement) changedElements.get(i);
 			if (curr.isReadOnly()) {
 				changedElements.remove(curr);
 			} else {
 				IPath path = curr.getPath();
 				IPath prevPath = DLTKCore.getBuildpathVariable(curr.getName());
 				if (prevPath != null && prevPath.equals(path)) {
 					changedElements.remove(curr);
 				} else {
 					changedVariables.add(curr.getName());
 				}
 			}
 			removedVariables.remove(curr.getName());
 		}
 		int steps = changedElements.size() + removedVariables.size();
 		if (steps > 0) {

 			boolean needsBuild = false;
 			if (fAskToBuild
 					&& doesChangeRequireFullBuild(removedVariables,
 							changedVariables)) {
 				String title = NewWizardMessages.VariableBlock_needsbuild_title;
 				String message = NewWizardMessages.VariableBlock_needsbuild_message;

 				MessageDialog buildDialog = new MessageDialog(getShell(),
 						title, null, message, MessageDialog.QUESTION,
 						new String[] { IDialogConstants.YES_LABEL,
 								IDialogConstants.NO_LABEL,
 								IDialogConstants.CANCEL_LABEL }, 2);
 				int res = buildDialog.open();
 				if (res != 0 && res != 1) {
 					return false;
 				}
 				needsBuild = (res == 0);
 			}

 			final VariableBlockRunnable runnable = new VariableBlockRunnable(
 					removedVariables, changedElements);
 			final ProgressMonitorDialog dialog = new ProgressMonitorDialog(
 					getShell());
 			try {
 				dialog.run(true, true, runnable);
 			} catch (InvocationTargetException e) {
 				ExceptionHandler
 						.handle(
 								new InvocationTargetException(
 										new NullPointerException()),
 								getShell(),
 								NewWizardMessages.VariableBlock_variableSettingError_titel,
 								NewWizardMessages.VariableBlock_variableSettingError_message);
 				return false;
 			} catch (InterruptedException e) {
 				return false;
 			}

 			if (needsBuild) {
 				CoreUtility.getBuildJob(null).schedule();
 			}
 		}
 		return true;
 	}

 	private boolean doesChangeRequireFullBuild(List removed, List changed) {
 		try {
 			IScriptModel model = DLTKCore.create(ResourcesPlugin.getWorkspace()
 					.getRoot());
 			IScriptProject[] projects = model.getScriptProjects();
 			for (int i = 0; i < projects.length; i++) {
 				IBuildpathEntry[] entries = projects[i].getRawBuildpath();
 				for (int k = 0; k < entries.length; k++) {
 					IBuildpathEntry curr = entries[k];
 					if (curr.getEntryKind() == IBuildpathEntry.BPE_VARIABLE) {
 						String var = curr.getPath().segment(0);
 						if (removed.contains(var) || changed.contains(var)) {
 							return true;
 						}
 					}
 				}
 			}
 		} catch (ModelException e) {
 			return true;
 		}
 		return false;
 	}

 	private class VariableBlockRunnable implements IRunnableWithProgress {
 		private final List fToRemove;
 		private final List fToChange;

 		public VariableBlockRunnable(List toRemove, List toChange) {
 			fToRemove = toRemove;
 			fToChange = toChange;
 		}

 		@Override
 		public void run(IProgressMonitor monitor)
 				throws InvocationTargetException, InterruptedException {
 			monitor
 					.beginTask(NewWizardMessages.VariableBlock_operation_desc,
 							1);
 			try {
 				setVariables(monitor);

 			} catch (CoreException e) {
 				throw new InvocationTargetException(e);
 			} catch (OperationCanceledException e) {
 				throw new InterruptedException();
 			} finally {
 				monitor.done();
 			}
 		}

 		public void setVariables(IProgressMonitor monitor)
 				throws ModelException, CoreException {
 			int nVariables = fToChange.size() + fToRemove.size();

 			String[] names = new String[nVariables];
 			IPath[] paths = new IPath[nVariables];
 			int k = 0;

 			for (int i = 0; i < fToChange.size(); i++) {
 				BPVariableElement curr = (BPVariableElement) fToChange.get(i);
 				names[k] = curr.getName();
 				paths[k] = curr.getPath();
 				k++;
 			}
 			for (int i = 0; i < fToRemove.size(); i++) {
 				names[k] = (String) fToRemove.get(i);
 				paths[k] = null;
 				k++;
 			}
 			DLTKCore.setBuildpathVariables(names, paths,
 					new SubProgressMonitor(monitor, 1));
 		}
 	}

 	/**
 	 * If set to true, a dialog will ask the user to build on variable changed
 	 *
 	 * @param askToBuild
 	 *            The askToBuild to set
 	 */
 	public void setAskToBuild(boolean askToBuild) {
 		fAskToBuild = askToBuild;
 	}

 	/**
 	 * @param initSelection
 	 *            the initial selection
 	 */
 	public void refresh(String initSelection) {
 		BPVariableElement initSelectedElement = null;

 		String[] entries = DLTKCore.getBuildpathVariableNames();
 		ArrayList elements = new ArrayList(entries.length);
 		for (int i = 0; i < entries.length; i++) {
 			String name = entries[i];
 			BPVariableElement elem;
 			IPath entryPath = DLTKCore.getBuildpathVariable(name);
 			if (entryPath != null) {
 				elem = new BPVariableElement(name, entryPath);
 				elements.add(elem);
 				if (name.equals(initSelection)) {
 					initSelectedElement = elem;
 				}
 			} else {
 				DLTKUIPlugin
 						.logErrorMessage("VariableBlock: Buildpath variable with null value: " + name); //$NON-NLS-1$
 			}
 		}

 		fVariablesList.setElements(elements);

 		if (initSelectedElement != null) {
 			ISelection sel = new StructuredSelection(initSelectedElement);
 			fVariablesList.selectElements(sel);
 		} else {
 			fVariablesList.selectFirstElement();
 		}

 		fHasChanges = false;
 	}

 	public void setSelection(String elementName) {
 		for (int i = 0; i < fVariablesList.getSize(); i++) {
 			BPVariableElement elem = (BPVariableElement) fVariablesList
 					.getElement(i);
 			if (elem.getName().equals(elementName)) {
 				fVariablesList.selectElements(new StructuredSelection(elem));
 				return;
 			}
 		}
 	}

 }
	/*******************************************************************************
	* Copyright (c) 2000, 2017 IBM Corporation and others.
	* This program and the accompanying materials are made available under the
	* terms of the Eclipse Public License v. 2.0 which is available at
	* http://www.eclipse.org/legal/epl-2.0.
	*
	* SPDX-License-Identifier: EPL-2.0
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.dltk.internal.ui.wizards.buildpath;

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

	import org.eclipse.core.resources.ResourcesPlugin;
	import org.eclipse.core.runtime.CoreException;
	import org.eclipse.core.runtime.IPath;
	import org.eclipse.core.runtime.IProgressMonitor;
	import org.eclipse.core.runtime.OperationCanceledException;
	import org.eclipse.core.runtime.SubProgressMonitor;
	import org.eclipse.dltk.core.DLTKCore;
	import org.eclipse.dltk.core.IBuildpathEntry;
	import org.eclipse.dltk.core.IScriptModel;
	import org.eclipse.dltk.core.IScriptProject;
	import org.eclipse.dltk.core.ModelException;
	import org.eclipse.dltk.internal.ui.util.CoreUtility;
	import org.eclipse.dltk.internal.ui.wizards.NewWizardMessages;
	import org.eclipse.dltk.internal.ui.wizards.dialogfields.DialogField;
	import org.eclipse.dltk.internal.ui.wizards.dialogfields.IDialogFieldListener;
	import org.eclipse.dltk.internal.ui.wizards.dialogfields.IListAdapter;
	import org.eclipse.dltk.internal.ui.wizards.dialogfields.LayoutUtil;
	import org.eclipse.dltk.internal.ui.wizards.dialogfields.ListDialogField;
	import org.eclipse.dltk.ui.DLTKUIPlugin;
	import org.eclipse.dltk.ui.util.ExceptionHandler;
	import org.eclipse.jface.dialogs.IDialogConstants;
	import org.eclipse.jface.dialogs.MessageDialog;
	import org.eclipse.jface.dialogs.ProgressMonitorDialog;
	import org.eclipse.jface.operation.IRunnableWithProgress;
	import org.eclipse.jface.viewers.IDoubleClickListener;
	import org.eclipse.jface.viewers.ISelection;
	import org.eclipse.jface.viewers.ISelectionChangedListener;
	import org.eclipse.jface.viewers.StructuredSelection;
	import org.eclipse.jface.window.Window;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.custom.CLabel;
	import org.eclipse.swt.layout.GridData;
	import org.eclipse.swt.widgets.Composite;
	import org.eclipse.swt.widgets.Control;
	import org.eclipse.swt.widgets.Shell;

	public class VariableBlock {

	private final ListDialogField fVariablesList;
	private Control fControl;
	private CLabel fWarning;
	private boolean fHasChanges;

	private List fSelectedElements;
	private boolean fAskToBuild;
	private final boolean fEditOnDoubleclick;

	public VariableBlock(boolean inPreferencePage, String initSelection) {

	fSelectedElements = new ArrayList(0);
	fEditOnDoubleclick = inPreferencePage;
	fAskToBuild = true;

	String[] buttonLabels = new String[] {
	NewWizardMessages.VariableBlock_vars_add_button,
	NewWizardMessages.VariableBlock_vars_edit_button,
	NewWizardMessages.VariableBlock_vars_remove_button };

	VariablesAdapter adapter = new VariablesAdapter();

	BPVariableElementLabelProvider labelProvider = new BPVariableElementLabelProvider(
	inPreferencePage);

	fVariablesList = new ListDialogField(adapter, buttonLabels,
	labelProvider);
	fVariablesList.setDialogFieldListener(adapter);
	fVariablesList.setLabelText(NewWizardMessages.VariableBlock_vars_label);
	fVariablesList.setRemoveButtonIndex(2);

	fVariablesList.enableButton(1, false);

	// TODO: create a sorter or modify ListDialogField to work with
	// comparators
	// fVariablesList.setViewerComparator(new ViewerComparator() {
	// public int compare(Viewer viewer, Object e1, Object e2) {
	// if (e1 instanceof BPVariableElement
	// && e2 instanceof BPVariableElement) {
	// return getComparator().compare(
	// ((BPVariableElement) e1).getName(),
	// ((BPVariableElement) e2).getName());
	// }
	// return super.compare(viewer, e1, e2);
	// }
	// });
	refresh(initSelection);
	}

	public boolean hasChanges() {
	return fHasChanges;
	}

	public void setChanges(boolean hasChanges) {
	fHasChanges = hasChanges;
	}

	public Control createContents(Composite parent) {
	Composite composite = new Composite(parent, SWT.NONE);
	composite.setFont(parent.getFont());

	LayoutUtil.doDefaultLayout(composite,
	new DialogField[] { fVariablesList }, true, 0, 0);
	LayoutUtil.setHorizontalGrabbing(fVariablesList.getListControl(null));

	fWarning = new CLabel(composite, SWT.NONE);
	fWarning.setLayoutData(new GridData(SWT.FILL, SWT.TOP, true, false,
	fVariablesList.getNumberOfControls() - 1, 1));

	fControl = composite;

	return composite;
	}

	public void addDoubleClickListener(IDoubleClickListener listener) {
	fVariablesList.getTableViewer().addDoubleClickListener(listener);
	}

	public void addSelectionChangedListener(ISelectionChangedListener listener) {
	fVariablesList.getTableViewer().addSelectionChangedListener(listener);
	}

	private Shell getShell() {
	if (fControl != null) {
	return fControl.getShell();
	}
	return DLTKUIPlugin.getActiveWorkbenchShell();
	}

	private class VariablesAdapter implements IDialogFieldListener,
	IListAdapter {

	// -------- IListAdapter --------

	@Override
	public void customButtonPressed(ListDialogField field, int index) {
	switch (index) {
	case 0: /* add */
	editEntries(null);
	break;
	case 1: /* edit */
	List selected = field.getSelectedElements();
	editEntries((BPVariableElement) selected.get(0));
	break;
	}
	}

	@Override
	public void selectionChanged(ListDialogField field) {
	doSelectionChanged(field);
	}

	@Override
	public void doubleClicked(ListDialogField field) {
	if (fEditOnDoubleclick) {
	List selected = field.getSelectedElements();
	if (canEdit(selected, containsReadOnly(selected))) {
	editEntries((BPVariableElement) selected.get(0));
	}
	}
	}

	// ---------- IDialogFieldListener --------

	@Override
	public void dialogFieldChanged(DialogField field) {
	}

	}

	private boolean containsReadOnly(List selected) {
	for (int i = selected.size() - 1; i >= 0; i--) {
	if (((BPVariableElement) selected.get(i)).isReadOnly()) {
	return true;
	}
	}
	return false;
	}

	private boolean canEdit(List selected, boolean containsReadOnly) {
	return selected.size() == 1 && !containsReadOnly;
	}

	/**
	* @param field
	* the dialog field
	*/
	private void doSelectionChanged(DialogField field) {
	List selected = fVariablesList.getSelectedElements();
	boolean containsReadOnly = containsReadOnly(selected);

	// edit
	fVariablesList.enableButton(1, canEdit(selected, containsReadOnly));
	// remove button
	fVariablesList.enableButton(2, !containsReadOnly);

	fSelectedElements = selected;
	}

	private void editEntries(BPVariableElement entry) {
	List existingEntries = fVariablesList.getElements();

	VariableCreationDialog dialog = new VariableCreationDialog(getShell(),
	entry, existingEntries);
	if (dialog.open() != Window.OK) {
	return;
	}
	BPVariableElement newEntry = dialog.getBuildpathElement();
	if (entry == null) {
	fVariablesList.addElement(newEntry);
	entry = newEntry;
	fHasChanges = true;
	} else {
	boolean hasChanges = !(entry.getName().equals(newEntry.getName()) && entry
	.getPath().equals(newEntry.getPath()));
	if (hasChanges) {
	fHasChanges = true;
	entry.setName(newEntry.getName());
	entry.setPath(newEntry.getPath());
	fVariablesList.refresh();
	}
	}
	fVariablesList.selectElements(new StructuredSelection(entry));
	}

	public List getSelectedElements() {
	return fSelectedElements;
	}

	public boolean performOk() {
	ArrayList removedVariables = new ArrayList();
	ArrayList changedVariables = new ArrayList();
	removedVariables.addAll(Arrays.asList(DLTKCore
	.getBuildpathVariableNames()));

	// remove all unchanged
	List changedElements = fVariablesList.getElements();
	for (int i = changedElements.size() - 1; i >= 0; i--) {
	BPVariableElement curr = (BPVariableElement) changedElements.get(i);
	if (curr.isReadOnly()) {
	changedElements.remove(curr);
	} else {
	IPath path = curr.getPath();
	IPath prevPath = DLTKCore.getBuildpathVariable(curr.getName());
	if (prevPath != null && prevPath.equals(path)) {
	changedElements.remove(curr);
	} else {
	changedVariables.add(curr.getName());
	}
	}
	removedVariables.remove(curr.getName());
	}
	int steps = changedElements.size() + removedVariables.size();
	if (steps > 0) {

	boolean needsBuild = false;
	if (fAskToBuild
	&& doesChangeRequireFullBuild(removedVariables,
	changedVariables)) {
	String title = NewWizardMessages.VariableBlock_needsbuild_title;
	String message = NewWizardMessages.VariableBlock_needsbuild_message;

	MessageDialog buildDialog = new MessageDialog(getShell(),
	title, null, message, MessageDialog.QUESTION,
	new String[] { IDialogConstants.YES_LABEL,
	IDialogConstants.NO_LABEL,
	IDialogConstants.CANCEL_LABEL }, 2);
	int res = buildDialog.open();
	if (res != 0 && res != 1) {
	return false;
	}
	needsBuild = (res == 0);
	}

	final VariableBlockRunnable runnable = new VariableBlockRunnable(
	removedVariables, changedElements);
	final ProgressMonitorDialog dialog = new ProgressMonitorDialog(
	getShell());
	try {
	dialog.run(true, true, runnable);
	} catch (InvocationTargetException e) {
	ExceptionHandler
	.handle(
	new InvocationTargetException(
	new NullPointerException()),
	getShell(),
	NewWizardMessages.VariableBlock_variableSettingError_titel,
	NewWizardMessages.VariableBlock_variableSettingError_message);
	return false;
	} catch (InterruptedException e) {
	return false;
	}

	if (needsBuild) {
	CoreUtility.getBuildJob(null).schedule();
	}
	}
	return true;
	}

	private boolean doesChangeRequireFullBuild(List removed, List changed) {
	try {
	IScriptModel model = DLTKCore.create(ResourcesPlugin.getWorkspace()
	.getRoot());
	IScriptProject[] projects = model.getScriptProjects();
	for (int i = 0; i < projects.length; i++) {
	IBuildpathEntry[] entries = projects[i].getRawBuildpath();
	for (int k = 0; k < entries.length; k++) {
	IBuildpathEntry curr = entries[k];
	if (curr.getEntryKind() == IBuildpathEntry.BPE_VARIABLE) {
	String var = curr.getPath().segment(0);
	if (removed.contains(var) \|\| changed.contains(var)) {
	return true;
	}
	}
	}
	}
	} catch (ModelException e) {
	return true;
	}
	return false;
	}

	private class VariableBlockRunnable implements IRunnableWithProgress {
	private final List fToRemove;
	private final List fToChange;

	public VariableBlockRunnable(List toRemove, List toChange) {
	fToRemove = toRemove;
	fToChange = toChange;
	}

	@Override
	public void run(IProgressMonitor monitor)
	throws InvocationTargetException, InterruptedException {
	monitor
	.beginTask(NewWizardMessages.VariableBlock_operation_desc,
	1);
	try {
	setVariables(monitor);

	} catch (CoreException e) {
	throw new InvocationTargetException(e);
	} catch (OperationCanceledException e) {
	throw new InterruptedException();
	} finally {
	monitor.done();
	}
	}

	public void setVariables(IProgressMonitor monitor)
	throws ModelException, CoreException {
	int nVariables = fToChange.size() + fToRemove.size();

	String[] names = new String[nVariables];
	IPath[] paths = new IPath[nVariables];
	int k = 0;

	for (int i = 0; i < fToChange.size(); i++) {
	BPVariableElement curr = (BPVariableElement) fToChange.get(i);
	names[k] = curr.getName();
	paths[k] = curr.getPath();
	k++;
	}
	for (int i = 0; i < fToRemove.size(); i++) {
	names[k] = (String) fToRemove.get(i);
	paths[k] = null;
	k++;
	}
	DLTKCore.setBuildpathVariables(names, paths,
	new SubProgressMonitor(monitor, 1));
	}
	}

	/**
	* If set to true, a dialog will ask the user to build on variable changed
	*
	* @param askToBuild
	* The askToBuild to set
	*/
	public void setAskToBuild(boolean askToBuild) {
	fAskToBuild = askToBuild;
	}

	/**
	* @param initSelection
	* the initial selection
	*/
	public void refresh(String initSelection) {
	BPVariableElement initSelectedElement = null;

	String[] entries = DLTKCore.getBuildpathVariableNames();
	ArrayList elements = new ArrayList(entries.length);
	for (int i = 0; i < entries.length; i++) {
	String name = entries[i];
	BPVariableElement elem;
	IPath entryPath = DLTKCore.getBuildpathVariable(name);
	if (entryPath != null) {
	elem = new BPVariableElement(name, entryPath);
	elements.add(elem);
	if (name.equals(initSelection)) {
	initSelectedElement = elem;
	}
	} else {
	DLTKUIPlugin
	.logErrorMessage("VariableBlock: Buildpath variable with null value: " + name); //$NON-NLS-1$
	}
	}

	fVariablesList.setElements(elements);

	if (initSelectedElement != null) {
	ISelection sel = new StructuredSelection(initSelectedElement);
	fVariablesList.selectElements(sel);
	} else {
	fVariablesList.selectFirstElement();
	}

	fHasChanges = false;
	}

	public void setSelection(String elementName) {
	for (int i = 0; i < fVariablesList.getSize(); i++) {
	BPVariableElement elem = (BPVariableElement) fVariablesList
	.getElement(i);
	if (elem.getName().equals(elementName)) {
	fVariablesList.selectElements(new StructuredSelection(elem));
	return;
	}
	}
	}

	}