core/plugins/org.eclipse.dltk.ui/src/org/eclipse/dltk/internal/ui/wizards/buildpath/newsourcepage/AddSelectedLibraryToBuildpathAction.java

/*******************************************************************************
 * 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
 *
 *******************************************************************************/
package org.eclipse.dltk.internal.ui.wizards.buildpath.newsourcepage;

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

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.SubProgressMonitor;
import org.eclipse.dltk.core.DLTKCore;
import org.eclipse.dltk.core.IBuildpathEntry;
import org.eclipse.dltk.core.IModelElement;
import org.eclipse.dltk.core.IScriptProject;
import org.eclipse.dltk.internal.corext.buildpath.BuildpathModifier;
import org.eclipse.dltk.internal.ui.wizards.NewWizardMessages;
import org.eclipse.dltk.internal.ui.wizards.buildpath.BPListElement;
import org.eclipse.dltk.ui.DLTKPluginImages;
import org.eclipse.dltk.ui.DLTKUIPlugin;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchPartReference;
import org.eclipse.ui.IWorkbenchSite;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.part.ISetSelectionTarget;


public class AddSelectedLibraryToBuildpathAction extends Action implements ISelectionChangedListener {

	private final IWorkbenchSite fSite;
	private IFile[] fSelectedElements;

	public AddSelectedLibraryToBuildpathAction(IWorkbenchSite site) {
		super(NewWizardMessages.NewSourceContainerWorkbookPage_ToolBar_AddSelLibToCP_label, DLTKPluginImages.DESC_OBJS_EXTJAR);
		setToolTipText(NewWizardMessages.NewSourceContainerWorkbookPage_ToolBar_AddSelLibToCP_tooltip);
		fSite= site;
		fSelectedElements= null;
	}

	@Override
	public void run() {
		try {
			final IFile[] files= fSelectedElements;
			if (files == null) {
				return;
			}

			final IRunnableWithProgress runnable = monitor -> {
				try {
					IScriptProject project = DLTKCore
							.create(files[0].getProject());
					List result = addLibraryEntries(files, project, monitor);
					selectAndReveal(new StructuredSelection(result));
				} catch (CoreException e) {
					throw new InvocationTargetException(e);
				}
			};
			PlatformUI.getWorkbench().getProgressService().run(true, false, runnable);
		} catch (final InvocationTargetException e) {
			if (e.getCause() instanceof CoreException) {
				showExceptionDialog((CoreException)e.getCause());
			} else {
				DLTKUIPlugin.log(e);
			}
		} catch (final InterruptedException e) {
		}
	}

	private List addLibraryEntries(IFile[] resources, IScriptProject project, IProgressMonitor monitor) throws CoreException {
		List addedEntries= new ArrayList();
		try {
			monitor.beginTask(NewWizardMessages.BuildpathModifier_Monitor_AddToBuildpath, 4);
			for (int i= 0; i < resources.length; i++) {
				IResource res= resources[i];
				addedEntries.add(new BPListElement(project, IBuildpathEntry.BPE_LIBRARY, res.getFullPath(), res, false));
			}
			monitor.worked(1);

			List existingEntries= BuildpathModifier.getExistingEntries(project);
			BuildpathModifier.setNewEntry(existingEntries, addedEntries, project, new SubProgressMonitor(monitor, 1));
			BuildpathModifier.commitBuildPath(existingEntries, project, new SubProgressMonitor(monitor, 1));

			List result= new ArrayList(addedEntries.size());
			for (int i= 0; i < resources.length; i++) {
				IResource res= resources[i];
				IModelElement elem= project.getProjectFragment(res);
				if (elem != null) {
					result.add(elem);
				}
			}

			monitor.worked(1);
			return result;
		} finally {
			monitor.done();
		}
	}

	@Override
	public void selectionChanged(final SelectionChangedEvent event) {
		final ISelection selection = event.getSelection();
		if (selection instanceof IStructuredSelection) {
			setEnabled(canHandle((IStructuredSelection) selection));
		} else {
			setEnabled(canHandle(StructuredSelection.EMPTY));
		}
	}

	private boolean canHandle(IStructuredSelection elements) {
		fSelectedElements= getSelectedResources(elements);
		return fSelectedElements != null;
	}

	private IFile[] getSelectedResources(IStructuredSelection elements) {
		if (elements.size() == 0)
			return null;

		ArrayList res= new ArrayList();
		try {
			for (Iterator iter= elements.iterator(); iter.hasNext();) {
				Object element= iter.next();
				if (element instanceof IFile) {
					IFile file= (IFile)element;
					IScriptProject project= DLTKCore.create(file.getProject());
					if (project == null)
						return null;

					if (!BuildpathModifier.isArchive(file, project))
						return null;
				} else {
					return null;
				}
				res.add(element);
			}
			return (IFile[]) res.toArray(new IFile[res.size()]);
		} catch (CoreException e) {
		}
		return null;
	}


	private void showExceptionDialog(CoreException exception) {
		showError(exception, fSite.getShell(), NewWizardMessages.AddSelectedLibraryToBuildpathAction_ErrorTitle, exception.getMessage());
	}

	private void showError(CoreException e, Shell shell, String title, String message) {
		IStatus status= e.getStatus();
		if (status != null) {
			ErrorDialog.openError(shell, message, title, status);
		} else {
			MessageDialog.openError(shell, title, message);
		}
	}

	private void selectAndReveal(final ISelection selection) {
		// validate the input
		IWorkbenchPage page= fSite.getPage();
		if (page == null)
			return;

		// get all the view and editor parts
		List parts= new ArrayList();
		IWorkbenchPartReference refs[]= page.getViewReferences();
		for (int i= 0; i < refs.length; i++) {
			IWorkbenchPart part= refs[i].getPart(false);
			if (part != null)
				parts.add(part);
		}
		refs= page.getEditorReferences();
		for (int i= 0; i < refs.length; i++) {
			if (refs[i].getPart(false) != null)
				parts.add(refs[i].getPart(false));
		}

		Iterator itr= parts.iterator();
		while (itr.hasNext()) {
			IWorkbenchPart part= (IWorkbenchPart) itr.next();

			// get the part's ISetSelectionTarget implementation
			ISetSelectionTarget target= null;
			if (part instanceof ISetSelectionTarget)
				target= (ISetSelectionTarget) part;
			else
				target = part.getAdapter(ISetSelectionTarget.class);

			if (target != null) {
				// select and reveal resource
				final ISetSelectionTarget finalTarget= target;
				page.getWorkbenchWindow().getShell().getDisplay()
						.asyncExec(() -> finalTarget.selectReveal(selection));
			}
		}
	}

}