1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
/*******************************************************************************
* Copyright (c) 2000, 20007 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 org.eclipse.swt.dnd;
import org.eclipse.swt.internal.ole.win32.*;
import org.eclipse.swt.internal.win32.*;
/**
* The class <code>URLTransfer</code> provides a platform specific mechanism
* for converting text in URL format represented as a java <code>String</code>
* to a platform specific representation of the data and vice versa. The string
* must contain a fully specified url.
*
* <p>An example of a java <code>String</code> containing a URL is shown below:</p>
*
* <code><pre>
* String url = "http://www.eclipse.org";
* </code></pre>
*
* @see Transfer
* @since 3.4
*/
public class URLTransfer extends ByteArrayTransfer {
static URLTransfer _instance = new URLTransfer();
static final String CFSTR_INETURLW = "UniformResourceLocatorW"; //$NON-NLS-1$
static final int CFSTR_INETURLIDW = registerType(CFSTR_INETURLW);
static final String CFSTR_INETURL = "UniformResourceLocator"; //$NON-NLS-1$
static final int CFSTR_INETURLID = registerType(CFSTR_INETURL);
private URLTransfer() {}
/**
* Returns the singleton instance of the URLTransfer class.
*
* @return the singleton instance of the URLTransfer class
*/
public static URLTransfer getInstance () {
return _instance;
}
/**
* This implementation of <code>javaToNative</code> converts a URL
* represented by a java <code>String</code> to a platform specific representation.
*
* @param object a java <code>String</code> containing a URL
* @param transferData an empty <code>TransferData</code> object that will
* be filled in on return with the platform specific format of the data
*
* @see Transfer#nativeToJava
*/
public void javaToNative (Object object, TransferData transferData){
if (!checkURL(object) || !isSupportedType(transferData)) {
DND.error(DND.ERROR_INVALID_DATA);
}
transferData.result = COM.E_FAIL;
// URL is stored as a null terminated byte array
String url = ((String)object);
if (transferData.type == CFSTR_INETURLIDW) {
int charCount = url.length ();
char[] chars = new char[charCount+1];
url.getChars (0, charCount, chars, 0);
int byteCount = chars.length * 2;
long /*int*/ newPtr = OS.GlobalAlloc(COM.GMEM_FIXED | COM.GMEM_ZEROINIT, byteCount);
OS.MoveMemory(newPtr, chars, byteCount);
transferData.stgmedium = new STGMEDIUM();
transferData.stgmedium.tymed = COM.TYMED_HGLOBAL;
transferData.stgmedium.unionField = newPtr;
transferData.stgmedium.pUnkForRelease = 0;
transferData.result = COM.S_OK;
} else if (transferData.type == CFSTR_INETURLID) {
int count = url.length();
char[] chars = new char[count + 1];
url.getChars(0, count, chars, 0);
int codePage = OS.GetACP();
int cchMultiByte = OS.WideCharToMultiByte(codePage, 0, chars, -1, null, 0, null, null);
if (cchMultiByte == 0) {
transferData.stgmedium = new STGMEDIUM();
transferData.result = COM.DV_E_STGMEDIUM;
return;
}
long /*int*/ lpMultiByteStr = OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, cchMultiByte);
OS.WideCharToMultiByte(codePage, 0, chars, -1, lpMultiByteStr, cchMultiByte, null, null);
transferData.stgmedium = new STGMEDIUM();
transferData.stgmedium.tymed = COM.TYMED_HGLOBAL;
transferData.stgmedium.unionField = lpMultiByteStr;
transferData.stgmedium.pUnkForRelease = 0;
transferData.result = COM.S_OK;
}
}
/**
* This implementation of <code>nativeToJava</code> converts a platform
* specific representation of a URL to a java <code>String</code>.
*
* @param transferData the platform specific representation of the data to be converted
* @return a java <code>String</code> containing a URL if the conversion was successful;
* otherwise null
*
* @see Transfer#javaToNative
*/
public Object nativeToJava(TransferData transferData){
if (!isSupportedType(transferData) || transferData.pIDataObject == 0) return null;
IDataObject data = new IDataObject(transferData.pIDataObject);
data.AddRef();
STGMEDIUM stgmedium = new STGMEDIUM();
FORMATETC formatetc = transferData.formatetc;
stgmedium.tymed = COM.TYMED_HGLOBAL;
transferData.result = getData(data, formatetc, stgmedium);
data.Release();
if (transferData.result != COM.S_OK) return null;
long /*int*/ hMem = stgmedium.unionField;
try {
if (transferData.type == CFSTR_INETURLIDW) {
/* Ensure byteCount is a multiple of 2 bytes */
int size = OS.GlobalSize(hMem) / 2 * 2;
if (size == 0) return null;
char[] chars = new char[size/2];
long /*int*/ ptr = OS.GlobalLock(hMem);
if (ptr == 0) return null;
try {
OS.MoveMemory(chars, ptr, size);
int length = chars.length;
for (int i=0; i<chars.length; i++) {
if (chars [i] == '\0') {
length = i;
break;
}
}
return new String (chars, 0, length);
} finally {
OS.GlobalUnlock(hMem);
}
} else if (transferData.type == CFSTR_INETURLID) {
long /*int*/ lpMultiByteStr = OS.GlobalLock(hMem);
if (lpMultiByteStr == 0) return null;
try {
int codePage = OS.GetACP();
int cchWideChar = OS.MultiByteToWideChar (codePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, null, 0);
if (cchWideChar == 0) return null;
char[] lpWideCharStr = new char [cchWideChar - 1];
OS.MultiByteToWideChar (codePage, OS.MB_PRECOMPOSED, lpMultiByteStr, -1, lpWideCharStr, lpWideCharStr.length);
return new String(lpWideCharStr);
} finally {
OS.GlobalUnlock(hMem);
}
}
} finally {
OS.GlobalFree(hMem);
}
return null;
}
protected int[] getTypeIds(){
return new int[] {CFSTR_INETURLIDW, CFSTR_INETURLID};
}
protected String[] getTypeNames(){
return new String[] {CFSTR_INETURLW, CFSTR_INETURL};
}
boolean checkURL(Object object) {
return object != null && (object instanceof String) && ((String)object).length() > 0;
}
protected boolean validate(Object object) {
return checkURL(object);
}
}
|
