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
  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         private static final int TYPEID= registerType(TYPE_NAME);
  29
  30         private static final LocalSelectionTransfer INSTANCE= new LocalSelectionTransfer();
  31
  32         private ISelection fSelection;
  33         private int fSelectionSetTime;
  34
  35         private LocalSelectionTransfer() {
  36         }
  37
  38         /**
  39          * Returns the singleton.
  40          */
  41         public static LocalSelectionTransfer getInstance() {
  42                 return INSTANCE;
  43         }
  44
  45         /**
  46          * Sets the transfer data for local use.
  47          */
  48         public void setSelection(ISelection s) {
  49                 fSelection= s;
  50         }
  51
  52         /**
  53          * Returns the local transfer data.
  54          */
  55         public ISelection getSelection() {
  56                 return fSelection;
  57         }
  58
  59         public void javaToNative(Object object, TransferData transferData) {
  60                 // No encoding needed since this is a hardcoded string read and written in the same process.
  61                 // See nativeToJava below
  62                 byte[] check= TYPE_NAME.getBytes();
  63                 super.javaToNative(check, transferData);
  64         }
  65
  66         public Object nativeToJava(TransferData transferData) {
  67                 Object result= super.nativeToJava(transferData);
  68                 if (isInvalidNativeType(result)) {
  69                         PHPeclipsePlugin.log(IStatus.ERROR, PHPUIMessages.getString("LocalSelectionTransfer.errorMessage")); //$NON-NLS-1$
  70                 }
  71                 return fSelection;
  72         }
  73
  74         private boolean isInvalidNativeType(Object result) {
  75                 // No encoding needed since this is a hardcoded string read and written in the same process.
  76                 // See javaToNative above
  77                 return !(result instanceof byte[]) || !TYPE_NAME.equals(new String((byte[])result));
  78         }
  79
  80         /**
  81          * The type id used to identify this transfer.
  82          */
  83         protected int[] getTypeIds() {
  84                 return new int[] {TYPEID};
  85         }
  86
  87         protected String[] getTypeNames(){
  88                 return new String[] {TYPE_NAME};
  89         }
  90
  91         public int getSelectionSetTime() {
  92                 return fSelectionSetTime;
  93         }
  94
  95         public void setSelectionSetTime(int time) {
  96                 fSelectionSetTime= time;
  97         }
  98
  99 }