package org.erlide.ui.handlers;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.commands.IHandler;
import org.eclipse.core.commands.IHandlerListener;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.ListenerList;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.IDialogConstants;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.ide.IDE;
import org.erlide.ui.dialogs.OpenModuleDialog;
import org.erlide.ui.editors.erl.IErlangHelpContextIds;
import org.erlide.util.ErlLogger;
public final class OpenModuleHandler extends Action implements IHandler,
IWorkbenchWindowActionDelegate {
/**
* The identifier of the parameter storing the file path.
*/
private static final String PARAM_ID_FILE_PATH = "filePath"; //$NON-NLS-1$
/**
* A collection of objects listening to changes to this manager. This
* collection is <code>null</code> if there are no listeners.
*/
private transient ListenerList listenerList = null;
/**
* Creates a new instance of the class.
*/
public OpenModuleHandler() {
super();
PlatformUI.getWorkbench().getHelpSystem()
.setHelp(this, IErlangHelpContextIds.OPEN_MODULE_ACTION);
}
@Override
public final void addHandlerListener(final IHandlerListener listener) {
if (listenerList == null) {
listenerList = new ListenerList(ListenerList.IDENTITY);
}
listenerList.add(listener);
}
@Override
public final void dispose() {
listenerList = null;
}
@Override
public final Object execute(final ExecutionEvent event) throws ExecutionException {
final List<IFile> files = new ArrayList<IFile>();
if (event.getParameter(PARAM_ID_FILE_PATH) == null) {
// Prompt the user for the resource to open.
final Object[] result = queryFileResource();
promptForFiles(files, result);
} else {
// Use the given parameter.
final IResource resource = (IResource) event
.getObjectParameterForExecution(PARAM_ID_FILE_PATH);
if (!(resource instanceof IFile)) {
throw new ExecutionException("filePath parameter must identify a file"); //$NON-NLS-1$
}
files.add((IFile) resource);
}
if (!files.isEmpty()) {
final IWorkbenchWindow window = PlatformUI.getWorkbench()
.getActiveWorkbenchWindow();
if (window == null) {
throw new ExecutionException("no active workbench window"); //$NON-NLS-1$
}
final IWorkbenchPage page = window.getActivePage();
if (page == null) {
throw new ExecutionException("no active workbench page"); //$NON-NLS-1$
}
try {
for (final IFile file : files) {
IDE.openEditor(page, file, true);
}
} catch (final PartInitException e) {
throw new ExecutionException("error opening file in editor", e); //$NON-NLS-1$
}
}
return null;
}
private void promptForFiles(final List<IFile> files, final Object[] result) {
if (result != null) {
for (final Object o : result) {
if (o instanceof IFile) {
files.add((IFile) o);
} else if (o instanceof String) {
try {
final String path = (String) o;
final IFile[] cons = ResourcesPlugin.getWorkspace().getRoot()
.findFilesForLocationURI(new URI(path));
for (final IFile con : cons) {
if (cons.length == 1) {
files.add(con);
}
}
if (files.isEmpty()) {
// final IFile file =
// ErlangEngine.getInstance().getModelUtilService().openExternal(null,
// path);
// files.add(file);
}
// } catch (final CoreException e) {
} catch (final URISyntaxException e) {
ErlLogger.error(e);
}
}
}
}
}
@Override
public final void init(final IWorkbenchWindow window) {
// Do nothing.
}
/**
* Query the user for the resources that should be opened
*
* @return the resource that should be opened.
*/
private final Object[] queryFileResource() {
final IWorkbenchWindow window = PlatformUI.getWorkbench()
.getActiveWorkbenchWindow();
if (window == null) {
return null;
}
final OpenModuleDialog dialog = new OpenModuleDialog(window.getShell());
final int resultCode = dialog.open();
if (resultCode != IDialogConstants.OK_ID) {
return null;
}
final Object[] result = dialog.getResult();
return result;
}
@Override
public final void removeHandlerListener(final IHandlerListener listener) {
if (listenerList != null) {
listenerList.remove(listener);
if (listenerList.isEmpty()) {
listenerList = null;
}
}
}
@Override
public final void run(final IAction action) {
try {
execute(new ExecutionEvent());
} catch (final ExecutionException e) {
// Do nothing. Maybe show error message?
}
}
@Override
public final void selectionChanged(final IAction action, final ISelection selection) {
// Do nothing.
}
}