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
|
/*******************************************************************************
* Copyright (c) 2000, 2007 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.carbon.CFRange;
import org.eclipse.swt.internal.carbon.OS;
/**
* The class <code>TextTransfer</code> provides a platform specific mechanism
* for converting plain text represented as a java <code>String</code>
* to a platform specific representation of the data and vice versa.
*
* <p>An example of a java <code>String</code> containing plain text is shown
* below:</p>
*
* <code><pre>
* String textData = "Hello World";
* </code></pre>
*
* @see Transfer
*/
public class TextTransfer extends ByteArrayTransfer {
static TextTransfer _instance = new TextTransfer();
static final String TEXT = "TEXT"; //$NON-NLS-1$
static final String UTEXT = "utxt"; //$NON-NLS-1$
static final String UTF8 = "utf8"; //$NON-NLS-1$
static final int TEXTID = OS.kScrapFlavorTypeText;
static final int UTEXTID = OS.kScrapFlavorTypeUnicode;
static final int UTF8ID = ('u'<<24) + ('t'<<16) + ('f'<<8) + '8';
TextTransfer() {}
/**
* Returns the singleton instance of the TextTransfer class.
*
* @return the singleton instance of the TextTransfer class
*/
public static TextTransfer getInstance () {
return _instance;
}
/**
* This implementation of <code>javaToNative</code> converts plain text
* represented by a java <code>String</code> to a platform specific representation.
*
* @param object a java <code>String</code> containing text
* @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 (!checkText(object) || !isSupportedType(transferData)) {
DND.error(DND.ERROR_INVALID_DATA);
}
String string = (String)object;
char[] chars = new char[string.length()];
string.getChars (0, chars.length, chars, 0);
transferData.result = -1;
switch (transferData.type) {
case UTF8ID:
case TEXTID: {
int cfstring = OS.CFStringCreateWithCharacters(OS.kCFAllocatorDefault, chars, chars.length);
if (cfstring == 0) return;
byte[] buffer = null;
try {
CFRange range = new CFRange();
range.length = chars.length;
int encoding = transferData.type == UTF8ID ? OS.kCFStringEncodingUTF8 : OS.CFStringGetSystemEncoding();
int[] size = new int[1];
int numChars = OS.CFStringGetBytes(cfstring, range, encoding, (byte)'?', true, null, 0, size);
if (numChars == 0) return;
buffer = new byte[size[0]];
numChars = OS.CFStringGetBytes(cfstring, range, encoding, (byte)'?', true, buffer, size [0], size);
if (numChars == 0) return;
} finally {
OS.CFRelease(cfstring);
}
transferData.data = new byte[1][];
transferData.data[0] = buffer;
transferData.result = OS.noErr;
break;
}
case UTEXTID: {
byte[] buffer = new byte[chars.length * 2];
OS.memmove(buffer, chars, buffer.length);
transferData.data = new byte[1][];
transferData.data[0] = buffer;
transferData.result = OS.noErr;
break;
}
}
}
/**
* This implementation of <code>nativeToJava</code> converts a platform specific
* representation of plain text 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 text if the conversion was successful; otherwise null
*
* @see Transfer#javaToNative
*/
public Object nativeToJava(TransferData transferData){
if (!isSupportedType(transferData) || transferData.data == null) return null;
if (transferData.data.length == 0 || transferData.data[0].length == 0) return null;
byte[] buffer = transferData.data[0];
switch (transferData.type) {
case UTF8ID:
case TEXTID: {
int encoding = transferData.type == UTF8ID ? OS.kCFStringEncodingUTF8 : OS.CFStringGetSystemEncoding();
int cfstring = OS.CFStringCreateWithBytes(OS.kCFAllocatorDefault, buffer, buffer.length, encoding, true);
if (cfstring == 0) return null;
try {
int length = OS.CFStringGetLength(cfstring);
if (length == 0) return null;
char[] chars = new char[length];
CFRange range = new CFRange();
range.length = length;
OS.CFStringGetCharacters(cfstring, range, chars);
return new String(chars);
} finally {
OS.CFRelease(cfstring);
}
}
case UTEXTID: {
char[] chars = new char[(buffer.length + 1) / 2];
OS.memmove(chars, buffer, buffer.length);
return new String(chars);
}
}
return null;
}
protected int[] getTypeIds() {
return new int[] {UTEXTID, UTF8ID, TEXTID};
}
protected String[] getTypeNames() {
return new String[] {UTEXT, UTF8, TEXT};
}
boolean checkText(Object object) {
return (object != null && object instanceof String && ((String)object).length() > 0);
}
protected boolean validate(Object object) {
return checkText(object);
}
}
|
