net.sourceforge.phpeclipse/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
  16 import org.eclipse.core.runtime.IStatus;
  17 import org.eclipse.jface.viewers.ISelection;
  18 import org.eclipse.swt.dnd.ByteArrayTransfer;
  19 import org.eclipse.swt.dnd.TransferData;
  20
  21 public class LocalSelectionTransfer extends ByteArrayTransfer {
  22
  23         // First attempt to create a UUID for the type name to make sure that
  24         // different Eclipse applications use different "types" of
  25         // <code>LocalSelectionTransfer</code>
  26         private static final String TYPE_NAME = "local-selection-transfer-format" + (new Long(System.currentTimeMillis())).toString(); //$NON-NLS-1$;
  27
  28         private static final int TYPEID = registerType(TYPE_NAME);
  29
  30         private static final LocalSelectionTransfer INSTANCE = new LocalSelectionTransfer();
  31
  32         private ISelection fSelection;
  33
  34         private int fSelectionSetTime;
  35
  36         private LocalSelectionTransfer() {
  37         }
  38
  39         /**
  40          * Returns the singleton.
  41          */
  42         public static LocalSelectionTransfer getInstance() {
  43                 return INSTANCE;
  44         }
  45
  46         /**
  47          * Sets the transfer data for local use.
  48          */
  49         public void setSelection(ISelection s) {
  50                 fSelection = s;
  51         }
  52
  53         /**
  54          * Returns the local transfer data.
  55          */
  56         public ISelection getSelection() {
  57                 return fSelection;
  58         }
  59
  60         public void javaToNative(Object object, TransferData transferData) {
  61                 // No encoding needed since this is a hardcoded string read and written
  62                 // in the same process.
  63                 // See nativeToJava below
  64                 byte[] check = TYPE_NAME.getBytes();
  65                 super.javaToNative(check, transferData);
  66         }
  67
  68         public Object nativeToJava(TransferData transferData) {
  69                 Object result = super.nativeToJava(transferData);
  70                 if (isInvalidNativeType(result)) {
  71                         PHPeclipsePlugin.log(IStatus.ERROR, PHPUIMessages
  72                                         .getString("LocalSelectionTransfer.errorMessage")); //$NON-NLS-1$
  73                 }
  74                 return fSelection;
  75         }
  76
  77         private boolean isInvalidNativeType(Object result) {
  78                 // No encoding needed since this is a hardcoded string read and written
  79                 // in the same process.
  80                 // See javaToNative above
  81                 return !(result instanceof byte[])
  82                                 || !TYPE_NAME.equals(new String((byte[]) result));
  83         }
  84
  85         /**
  86          * The type id used to identify this transfer.
  87          */
  88         protected int[] getTypeIds() {
  89                 return new int[] { TYPEID };
  90         }
  91
  92         protected String[] getTypeNames() {
  93                 return new String[] { TYPE_NAME };
  94         }
  95
  96         public int getSelectionSetTime() {
  97                 return fSelectionSetTime;
  98         }
  99
 100         public void setSelectionSetTime(int time) {
 101                 fSelectionSetTime = time;
 102         }
 103
 104 }