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comparison org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/dnd/ByteArrayTransfer.d @ 0:6dd524f61e62

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add dwt win and basic java stuff
author Frank Benoit <benoit@tionex.de>
date Mon, 02 Mar 2009 14:44:16 +0100
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-1:000000000000 0:6dd524f61e62
1 /*******************************************************************************
2 * Copyright (c) 2000, 2008 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13 module org.eclipse.swt.dnd.ByteArrayTransfer;
14
15 import org.eclipse.swt.internal.ole.win32.COM;
16 import org.eclipse.swt.internal.ole.win32.OBJIDL;
17 import org.eclipse.swt.internal.win32.OS;
18
19 import org.eclipse.swt.dnd.DND;
20 import org.eclipse.swt.dnd.Transfer;
21 import org.eclipse.swt.dnd.TransferData;
22
23 import java.lang.all;
24
25 /**
26 * The class <code>ByteArrayTransfer</code> provides a platform specific
27 * mechanism for converting a java <code>byte[]</code> to a platform
28 * specific representation of the byte array and vice versa.
29 *
30 * <p><code>ByteArrayTransfer</code> is never used directly but is sub-classed
31 * by transfer agents that convert between data in a java format such as a
32 * <code>String</code> and a platform specific byte array.
33 *
34 * <p>If the data you are converting <b>does not</b> map to a
35 * <code>byte[]</code>, you should sub-class <code>Transfer</code> directly
36 * and do your own mapping to a platform data type.</p>
37 *
38 * <p>The following snippet shows a subclass of ByteArrayTransfer that transfers
39 * data defined by the class <code>MyType</code>.</p>
40 *
41 * <pre><code>
42 * public class MyType {
43 * public String fileName;
44 * public long fileLength;
45 * public long lastModified;
46 * }
47 * </code></pre>
48 *
49 * <pre><code>
50 * public class MyTypeTransfer extends ByteArrayTransfer {
51 *
52 * private static final String MYTYPENAME = "my_type_name";
53 * private static final int MYTYPEID = registerType(MYTYPENAME);
54 * private static MyTypeTransfer _instance = new MyTypeTransfer();
55 *
56 * private MyTypeTransfer() {}
57 *
58 * public static MyTypeTransfer getInstance () {
59 * return _instance;
60 * }
61 * public void javaToNative (Object object, TransferData transferData) {
62 * if (object is null || !(object instanceof MyType[])) return;
63 *
64 * if (isSupportedType(transferData)) {
65 * MyType[] myTypes = (MyType[]) object;
66 * try {
67 * // write data to a byte array and then ask super to convert to pMedium
68 * ByteArrayOutputStream out = new ByteArrayOutputStream();
69 * DataOutputStream writeOut = new DataOutputStream(out);
70 * for (int i = 0, length = myTypes.length; i &lt; length; i++){
71 * byte[] buffer = myTypes[i].fileName.getBytes();
72 * writeOut.writeInt(buffer.length);
73 * writeOut.write(buffer);
74 * writeOut.writeLong(myTypes[i].fileLength);
75 * writeOut.writeLong(myTypes[i].lastModified);
76 * }
77 * byte[] buffer = out.toByteArray();
78 * writeOut.close();
79 *
80 * super.javaToNative(buffer, transferData);
81 *
82 * } catch (IOException e) {
83 * }
84 * }
85 * }
86 * public Object nativeToJava(TransferData transferData){
87 *
88 * if (isSupportedType(transferData)) {
89 *
90 * byte[] buffer = (byte[])super.nativeToJava(transferData);
91 * if (buffer is null) return null;
92 *
93 * MyType[] myData = new MyType[0];
94 * try {
95 * ByteArrayInputStream in = new ByteArrayInputStream(buffer);
96 * DataInputStream readIn = new DataInputStream(in);
97 * while(readIn.available() > 20) {
98 * MyType datum = new MyType();
99 * int size = readIn.readInt();
100 * byte[] name = new byte[size];
101 * readIn.read(name);
102 * datum.fileName = new String(name);
103 * datum.fileLength = readIn.readLong();
104 * datum.lastModified = readIn.readLong();
105 * MyType[] newMyData = new MyType[myData.length + 1];
106 * System.arraycopy(myData, 0, newMyData, 0, myData.length);
107 * newMyData[myData.length] = datum;
108 * myData = newMyData;
109 * }
110 * readIn.close();
111 * } catch (IOException ex) {
112 * return null;
113 * }
114 * return myData;
115 * }
116 *
117 * return null;
118 * }
119 * protected String[] getTypeNames(){
120 * return new String[]{MYTYPENAME};
121 * }
122 * protected int[] getTypeIds(){
123 * return new int[] {MYTYPEID};
124 * }
125 * }
126 * </code></pre>
127 *
128 * @see Transfer
129 */
130 public abstract class ByteArrayTransfer : Transfer {
131
132 public TransferData[] getSupportedTypes() {
133 int[] types = getTypeIds();
134 TransferData[] data = new TransferData[types.length];
135 for (int i = 0; i < types.length; i++) {
136 data[i] = new TransferData();
137 data[i].type = types[i];
138 data[i].formatetc = new FORMATETC();
139 data[i].formatetc.cfFormat = types[i];
140 data[i].formatetc.dwAspect = COM.DVASPECT_CONTENT;
141 data[i].formatetc.lindex = -1;
142 data[i].formatetc.tymed = COM.TYMED_HGLOBAL;
143 }
144 return data;
145 }
146
147 public bool isSupportedType(TransferData transferData){
148 if (transferData is null) return false;
149 int[] types = getTypeIds();
150 for (int i = 0; i < types.length; i++) {
151 FORMATETC* format = transferData.formatetc;
152 if (format.cfFormat is types[i] &&
153 (format.dwAspect & COM.DVASPECT_CONTENT) is COM.DVASPECT_CONTENT &&
154 (format.tymed & COM.TYMED_HGLOBAL) is COM.TYMED_HGLOBAL )
155 return true;
156 }
157 return false;
158 }
159
160 /**
161 * This implementation of <code>javaToNative</code> converts a java
162 * <code>byte[]</code> to a platform specific representation.
163 *
164 * @param object a java <code>byte[]</code> containing the data to be converted
165 * @param transferData an empty <code>TransferData</code> object that will
166 * be filled in on return with the platform specific format of the data
167 *
168 * @see Transfer#nativeToJava
169 */
170 protected void javaToNative (Object object, TransferData transferData) {
171 if (!checkByteArray(object) || !isSupportedType(transferData)) {
172 DND.error(DND.ERROR_INVALID_DATA);
173 }
174 // Allocate the memory because the caller (DropTarget) has not handed it in
175 // The caller of this method must release the data when it is done with it.
176 byte[] data = (cast(ArrayWrapperByte)object).array;
177 int size = data.length;
178 auto newPtr = OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, size);
179 OS.MoveMemory(newPtr, data.ptr, size);
180 transferData.stgmedium = new STGMEDIUM();
181 transferData.stgmedium.tymed = COM.TYMED_HGLOBAL;
182 transferData.stgmedium.unionField = newPtr;
183 transferData.stgmedium.pUnkForRelease = null;
184 transferData.result = COM.S_OK;
185 }
186
187 /**
188 * This implementation of <code>nativeToJava</code> converts a platform specific
189 * representation of a byte array to a java <code>byte[]</code>.
190 *
191 * @param transferData the platform specific representation of the data to be converted
192 * @return a java <code>byte[]</code> containing the converted data if the conversion was
193 * successful; otherwise null
194 *
195 * @see Transfer#javaToNative
196 */
197 protected Object nativeToJava(TransferData transferData) {
198 if (!isSupportedType(transferData) || transferData.pIDataObject is null) return null;
199
200 IDataObject data = transferData.pIDataObject;
201 data.AddRef();
202 FORMATETC* formatetc = transferData.formatetc;
203 STGMEDIUM* stgmedium = new STGMEDIUM();
204 stgmedium.tymed = COM.TYMED_HGLOBAL;
205 transferData.result = getData(data, formatetc, stgmedium);
206 data.Release();
207 if (transferData.result !is COM.S_OK) return null;
208 auto hMem = stgmedium.unionField;
209 int size = OS.GlobalSize(hMem);
210 byte[] buffer = new byte[size];
211 auto ptr = OS.GlobalLock(hMem);
212 OS.MoveMemory(buffer.ptr, ptr, size);
213 OS.GlobalUnlock(hMem);
214 OS.GlobalFree(hMem);
215 return new ArrayWrapperByte(buffer);
216 }
217
218 bool checkByteArray(Object object) {
219 return (object !is null && ( null !is cast(ArrayWrapperByte)object) && (cast(ArrayWrapperByte)object).array.length > 0);
220 }
221 }