Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2008 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 com.synflow.ngDesign.ui.internal.navigator.actions; import java.util.List; import org.eclipse.core.resources.IContainer; import org.eclipse.core.resources.IResource; import org.eclipse.core.runtime.Assert; import org.eclipse.core.runtime.IPath; import org.eclipse.jface.dialogs.MessageDialog; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.swt.SWTError; import org.eclipse.swt.dnd.Clipboard; import org.eclipse.swt.dnd.DND; import org.eclipse.swt.dnd.FileTransfer; import org.eclipse.swt.dnd.TextTransfer; import org.eclipse.swt.dnd.Transfer; import org.eclipse.swt.widgets.Shell; import org.eclipse.ui.PlatformUI; import org.eclipse.ui.actions.SelectionListenerAction; import org.eclipse.ui.part.ResourceTransfer; /** * Standard action for copying the currently selected resources to the clipboard. * <p> * This class may be instantiated; it is not intended to be subclassed. * </p> * * @since 2.0 */ @SuppressWarnings("unchecked") public class CopyAction extends SelectionListenerAction { /** * The id of this action. */ public static final String ID = PlatformUI.PLUGIN_ID + ".CopyAction"; //$NON-NLS-1$ /** * System clipboard */ private Clipboard clipboard; /** * Associated paste action. May be <code>null</code> */ private PasteAction pasteAction; /** * The shell in which to show any dialogs. */ private Shell shell; /** * Creates a new action. * * @param shell * the shell for any dialogs * @param clipboard * a platform clipboard */ public CopyAction(Shell shell, Clipboard clipboard) { super("Copy"); Assert.isNotNull(shell); Assert.isNotNull(clipboard); this.shell = shell; this.clipboard = clipboard; setToolTipText("Copy selected resource(s)"); setId(CopyAction.ID); PlatformUI.getWorkbench().getHelpSystem().setHelp(this, "CopyHelpId"); //$NON-NLS-1$ } /** * Creates a new action. * * @param shell * the shell for any dialogs * @param clipboard * a platform clipboard * @param pasteAction * a paste action * * @since 2.0 */ public CopyAction(Shell shell, Clipboard clipboard, PasteAction pasteAction) { this(shell, clipboard); this.pasteAction = pasteAction; } /** * The <code>CopyAction</code> implementation of this method defined on <code>IAction</code> * copies the selected resources to the clipboard. */ @Override public void run() { List<IResource> selectedResources = getSelectedResources(); // cannot copy packages/source folder SelectionUtil.discardTreeElements(selectedResources, getStructuredSelection()); IResource[] resources = selectedResources.toArray(new IResource[selectedResources.size()]); // Get the file names and a string representation final int length = resources.length; int actualLength = 0; String[] fileNames = new String[length]; StringBuffer buf = new StringBuffer(); for (int i = 0; i < length; i++) { IPath location = resources[i].getLocation(); // location may be null. See bug 29491. if (location != null) { fileNames[actualLength++] = location.toOSString(); } if (i > 0) { buf.append("\n"); //$NON-NLS-1$ } buf.append(resources[i].getName()); } // was one or more of the locations null? if (actualLength < length) { String[] tempFileNames = fileNames; fileNames = new String[actualLength]; for (int i = 0; i < actualLength; i++) { fileNames[i] = tempFileNames[i]; } } if (resources.length > 0 && fileNames.length > 0) { setClipboard(resources, fileNames, buf.toString()); } else { clipboard.clearContents(); } // update the enablement of the paste action // workaround since the clipboard does not suppot callbacks if (pasteAction != null && pasteAction.getStructuredSelection() != null) { pasteAction.selectionChanged(pasteAction.getStructuredSelection()); } } /** * Set the clipboard contents. Prompt to retry if clipboard is busy. * * @param resources * the resources to copy to the clipboard * @param fileNames * file names of the resources to copy to the clipboard * @param names * string representation of all names */ private void setClipboard(IResource[] resources, String[] fileNames, String names) { try { // set the clipboard contents if (fileNames.length > 0) { clipboard.setContents(new Object[] { resources, fileNames, names }, new Transfer[] { ResourceTransfer.getInstance(), FileTransfer.getInstance(), TextTransfer.getInstance() }); } else { clipboard.setContents(new Object[] { resources, names }, new Transfer[] { ResourceTransfer.getInstance(), TextTransfer.getInstance() }); } } catch (SWTError e) { if (e.code != DND.ERROR_CANNOT_SET_CLIPBOARD) { throw e; } if (MessageDialog.openQuestion(shell, "Problem with copy title", // TODO ResourceNavigatorMessages.CopyToClipboardProblemDialog_title, //$NON-NLS-1$ "Problem with copy.")) { //$NON-NLS-1$ setClipboard(resources, fileNames, names); } } } /** * The <code>CopyAction</code> implementation of this <code>SelectionListenerAction</code> * method enables this action if one or more resources of compatible types are selected. */ @Override protected boolean updateSelection(IStructuredSelection selection) { if (!super.updateSelection(selection)) { return false; } if (getSelectedNonResources().size() > 0) { return false; } List<IResource> selectedResources = getSelectedResources(); if (selectedResources.size() == 0) { return false; } boolean projSelected = selectionIsOfType(IResource.PROJECT); boolean fileFoldersSelected = selectionIsOfType(IResource.FILE | IResource.FOLDER); if (!projSelected && !fileFoldersSelected) { return false; } // selection must be homogeneous if (projSelected && fileFoldersSelected) { return false; } // must have a common parent IContainer firstParent = selectedResources.get(0).getParent(); if (firstParent == null) { return false; } for (IResource currentResource : selectedResources) { if (!currentResource.getParent().equals(firstParent)) { return false; } // resource location must exist if (currentResource.getLocationURI() == null) { return false; } } return true; } }