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[phpeclipse.git] / 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 }