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annotate dwt/dnd/ByteArrayTransfer.d @ 0:380af2bdd8e5

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Upload of whole dwt tree
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sat, 09 Aug 2008 17:00:02 +0200
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *******************************************************************************/
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11 module dwt.dnd;
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12
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13
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14 /**
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15 * The class <code>ByteArrayTransfer</code> provides a platform specific
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16 * mechanism for converting a java <code>byte[]</code> to a platform
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17 * specific representation of the byte array and vice versa. See
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18 * <code>Transfer</code> for additional information.
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19 *
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20 * <p><code>ByteArrayTransfer</code> is never used directly but is sub-classed
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21 * by transfer agents that convert between data in a java format such as a
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22 * <code>String</code> and a platform specific byte array.
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23 *
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24 * <p>If the data you are converting <b>does not</b> map to a
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25 * <code>byte[]</code>, you should sub-class <code>Transfer</code> directly
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26 * and do your own mapping to a platform data type.</p>
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27 *
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28 * <p>The following snippet shows a subclass of ByteArrayTransfer that transfers
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29 * data defined by the class <code>MyType</code>.</p>
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30 *
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31 * <pre><code>
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32 * public class MyType {
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33 * public String fileName;
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34 * public long fileLength;
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35 * public long lastModified;
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36 * }
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37 * </code></pre>
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38 *
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39 * <pre><code>
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40 * public class MyTypeTransfer : ByteArrayTransfer {
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41 *
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42 * private static final String MYTYPENAME = "my_type_name";
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43 * private static final int MYTYPEID = registerType(MYTYPENAME);
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44 * private static MyTypeTransfer _instance = new MyTypeTransfer();
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45 *
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46 * private MyTypeTransfer() {}
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47 *
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48 * public static MyTypeTransfer getInstance () {
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49 * return _instance;
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50 * }
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51 * public void javaToNative (Object object, TransferData transferData) {
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52 * if (object is null || !(object instanceof MyType[])) return;
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53 *
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54 * if (isSupportedType(transferData)) {
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55 * MyType[] myTypes = (MyType[]) object;
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56 * try {
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57 * // write data to a byte array and then ask super to convert to pMedium
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58 * ByteArrayOutputStream out = new ByteArrayOutputStream();
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59 * DataOutputStream writeOut = new DataOutputStream(out);
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60 * for (int i = 0, length = myTypes.length; i &lt; length; i++){
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61 * byte[] buffer = myTypes[i].fileName.getBytes();
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62 * writeOut.writeInt(buffer.length);
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63 * writeOut.write(buffer);
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64 * writeOut.writeLong(myTypes[i].fileLength);
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65 * writeOut.writeLong(myTypes[i].lastModified);
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66 * }
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67 * byte[] buffer = out.toByteArray();
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68 * writeOut.close();
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69 *
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70 * super.javaToNative(buffer, transferData);
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71 *
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72 * } catch (IOException e) {
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73 * }
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74 * }
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75 * }
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76 * public Object nativeToJava(TransferData transferData){
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77 *
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78 * if (isSupportedType(transferData)) {
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79 *
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80 * byte[] buffer = (byte[])super.nativeToJava(transferData);
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81 * if (buffer is null) return null;
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82 *
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83 * MyType[] myData = new MyType[0];
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84 * try {
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85 * ByteArrayInputStream in = new ByteArrayInputStream(buffer);
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86 * DataInputStream readIn = new DataInputStream(in);
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87 * while(readIn.available() > 20) {
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88 * MyType datum = new MyType();
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89 * int size = readIn.readInt();
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90 * byte[] name = new byte[size];
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91 * readIn.read(name);
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92 * datum.fileName = new String(name);
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93 * datum.fileLength = readIn.readLong();
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94 * datum.lastModified = readIn.readLong();
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95 * MyType[] newMyData = new MyType[myData.length + 1];
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96 * System.arraycopy(myData, 0, newMyData, 0, myData.length);
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97 * newMyData[myData.length] = datum;
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98 * myData = newMyData;
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99 * }
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100 * readIn.close();
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101 * } catch (IOException ex) {
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102 * return null;
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103 * }
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104 * return myData;
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105 * }
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106 *
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107 * return null;
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108 * }
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109 * protected String[] getTypeNames(){
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110 * return new String[]{MYTYPENAME};
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111 * }
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112 * protected int[] getTypeIds(){
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113 * return new int[] {MYTYPEID};
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114 * }
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115 * }
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116 * </code></pre>
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117 */
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118 public abstract class ByteArrayTransfer : Transfer {
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119
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120 public TransferData[] getSupportedTypes() {
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121 int[] types = getTypeIds();
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122 TransferData[] data = new TransferData[types.length];
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123 for (int i = 0; i < types.length; i++) {
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124 data[i] = new TransferData();
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125 data[i].type = types[i];
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126 }
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127 return data;
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128 }
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129
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130 public bool isSupportedType(TransferData transferData){
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131 if (transferData is null) return false;
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132 int[] types = getTypeIds();
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133 for (int i = 0; i < types.length; i++) {
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134 if (transferData.type is types[i]) return true;
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135 }
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136 return false;
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137 }
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138
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139 /**
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140 * This implementation of <code>javaToNative</code> converts a java
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141 * <code>byte[]</code> to a platform specific representation. For additional
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142 * information see <code>Transfer#javaToNative</code>.
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143 *
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144 * @see Transfer#javaToNative
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145 *
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146 * @param object a java <code>byte[]</code> containing the data to be converted
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147 * @param transferData an empty <code>TransferData</code> object; this
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148 * object will be filled in on return with the platform specific format of the data
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149 */
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150 protected void javaToNative (Object object, TransferData transferData) {
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151 if (!checkByteArray(object) && !isSupportedType(transferData)) {
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152 DND.error(DND.ERROR_INVALID_DATA);
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153 }
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154 byte[] orig = (byte[])object;
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155 byte[] buffer = new byte[orig.length];
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156 System.arraycopy(orig, 0, buffer, 0, orig.length);
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157 transferData.data = new byte[1][];
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158 transferData.data[0] = buffer;
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159 transferData.result = 0;
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160 }
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161
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162 /**
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163 * This implementation of <code>nativeToJava</code> converts a platform specific
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164 * representation of a byte array to a java <code>byte[]</code>.
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165 * For additional information see <code>Transfer#nativeToJava</code>.
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166 *
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167 * @see Transfer#nativeToJava
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168 *
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169 * @param transferData the platform specific representation of the data to be
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170 * been converted
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171 * @return a java <code>byte[]</code> containing the converted data if the
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172 * conversion was successful; otherwise null
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173 */
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174 protected Object nativeToJava(TransferData transferData) {
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175 if (!isSupportedType(transferData) || transferData.data is null) return null;
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176 if (transferData.data.length is 0 || transferData.data[0].length is 0) return null;
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177 return transferData.data[0];
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178 }
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179 bool checkByteArray(Object object) {
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180 return (object !is null && object instanceof byte[] && ((byte[])object).length > 0);
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181 }
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182 }