net.sourceforge.phpeclipse.ui/src/net/sourceforge/phpdt/internal/ui/dnd/LocalSelectionTransfer.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpdt.internal.ui.dnd;
  12
  13 import net.sourceforge.phpdt.internal.ui.PHPUIMessages;
  14 //import net.sourceforge.phpeclipse.PHPeclipsePlugin;
  15 import net.sourceforge.phpeclipse.ui.WebUI;
  16
  17 import org.eclipse.core.runtime.IStatus;
  18 import org.eclipse.jface.viewers.ISelection;
  19 import org.eclipse.swt.dnd.ByteArrayTransfer;
  20 import org.eclipse.swt.dnd.TransferData;
  21
  22 public class LocalSelectionTransfer extends ByteArrayTransfer {
  23
  24         // First attempt to create a UUID for the type name to make sure that
  25         // different Eclipse applications use different "types" of
  26         // <code>LocalSelectionTransfer</code>
  27         private static final String TYPE_NAME = "local-selection-transfer-format" + (new Long(System.currentTimeMillis())).toString(); //$NON-NLS-1$;
  28
  29         private static final int TYPEID = registerType(TYPE_NAME);
  30
  31         private static final LocalSelectionTransfer INSTANCE = new LocalSelectionTransfer();
  32
  33         private ISelection fSelection;
  34
  35         private int fSelectionSetTime;
  36
  37         private LocalSelectionTransfer() {
  38         }
  39
  40         /**
  41          * Returns the singleton.
  42          */
  43         public static LocalSelectionTransfer getInstance() {
  44                 return INSTANCE;
  45         }
  46
  47         /**
  48          * Sets the transfer data for local use.
  49          */
  50         public void setSelection(ISelection s) {
  51                 fSelection = s;
  52         }
  53
  54         /**
  55          * Returns the local transfer data.
  56          */
  57         public ISelection getSelection() {
  58                 return fSelection;
  59         }
  60
  61         public void javaToNative(Object object, TransferData transferData) {
  62                 // No encoding needed since this is a hardcoded string read and written
  63                 // in the same process.
  64                 // See nativeToJava below
  65                 byte[] check = TYPE_NAME.getBytes();
  66                 super.javaToNative(check, transferData);
  67         }
  68
  69         public Object nativeToJava(TransferData transferData) {
  70                 Object result = super.nativeToJava(transferData);
  71                 if (isInvalidNativeType(result)) {
  72                         WebUI.log(IStatus.ERROR, PHPUIMessages
  73                                         .getString("LocalSelectionTransfer.errorMessage")); //$NON-NLS-1$
  74                 }
  75                 return fSelection;
  76         }
  77
  78         private boolean isInvalidNativeType(Object result) {
  79                 // No encoding needed since this is a hardcoded string read and written
  80                 // in the same process.
  81                 // See javaToNative above
  82                 return !(result instanceof byte[])
  83                                 || !TYPE_NAME.equals(new String((byte[]) result));
  84         }
  85
  86         /**
  87          * The type id used to identify this transfer.
  88          */
  89         protected int[] getTypeIds() {
  90                 return new int[] { TYPEID };
  91         }
  92
  93         protected String[] getTypeNames() {
  94                 return new String[] { TYPE_NAME };
  95         }
  96
  97         public int getSelectionSetTime() {
  98                 return fSelectionSetTime;
  99         }
 100
 101         public void setSelectionSetTime(int time) {
 102                 fSelectionSetTime = time;
 103         }
 104
 105 }