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annotate dwt/dnd/FileTransfer.d @ 320:da968414c383

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Merge changes SWT 3.4.1
author Frank Benoit <benoit@tionex.de>
date Mon, 03 Nov 2008 21:58:40 +0100
parents fd9c62a2998e
children
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwt.dnd.FileTransfer;
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14
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15 import dwt.internal.ole.win32.COM;
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16 import dwt.internal.ole.win32.OBJIDL;
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17 import dwt.internal.win32.OS;
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18
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19 import dwt.dnd.ByteArrayTransfer;
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20 import dwt.dnd.TransferData;
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21 import dwt.dnd.DND;
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22
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23 import dwt.dwthelper.utils;
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24 static import tango.text.Text;
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25 alias tango.text.Text.Text!(char) StringBuffer;
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26
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27 /**
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28 * The class <code>FileTransfer</code> provides a platform specific mechanism
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29 * for converting a list of files represented as a java <code>String[]</code> to a
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30 * platform specific representation of the data and vice versa.
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31 * Each <code>String</code> in the array contains the absolute path for a single
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32 * file or directory.
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33 *
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34 * <p>An example of a java <code>String[]</code> containing a list of files is shown
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35 * below:</p>
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36 *
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37 * <code><pre>
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38 * File file1 = new File("C:\temp\file1");
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39 * File file2 = new File("C:\temp\file2");
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40 * String[] fileData = new String[2];
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41 * fileData[0] = file1.getAbsolutePath();
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42 * fileData[1] = file2.getAbsolutePath();
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43 * </code></pre>
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44 *
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45 * @see Transfer
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46 */
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47 public class FileTransfer : ByteArrayTransfer {
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48
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49 private static FileTransfer _instance;
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50 private static final String CF_HDROP = "CF_HDROP "; //$NON-NLS-1$
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51 private static final int CF_HDROPID = COM.CF_HDROP;
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52 private static final String CF_HDROP_SEPARATOR = "\0"; //$NON-NLS-1$
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53
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54 private this() {}
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55
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56 /**
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57 * Returns the singleton instance of the FileTransfer class.
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58 *
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59 * @return the singleton instance of the FileTransfer class
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60 */
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61 public static FileTransfer getInstance () {
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62 if( _instance is null ){
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63 synchronized {
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64 if( _instance is null ){
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65 _instance = new FileTransfer();
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66 }
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67 }
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68 }
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69 return _instance;
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70 }
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71
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72 /**
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73 * This implementation of <code>javaToNative</code> converts a list of file names
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74 * represented by a java <code>String[]</code> to a platform specific representation.
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75 * Each <code>String</code> in the array contains the absolute path for a single
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76 * file or directory.
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77 *
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78 * @param object a java <code>String[]</code> containing the file names to be converted
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79 * @param transferData an empty <code>TransferData</code> object that will
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80 * be filled in on return with the platform specific format of the data
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81 *
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82 * @see Transfer#nativeToJava
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83 */
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84 public void javaToNative(Object object, TransferData transferData) {
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85 if (!checkFile(object) || !isSupportedType(transferData)) {
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86 DND.error(DND.ERROR_INVALID_DATA);
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87 }
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88 String[] fileNames;
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89 if( auto strs = cast(ArrayWrapperString2) object ){
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90 fileNames = strs.array;
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91 }
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92 StringBuffer allFiles = new StringBuffer();
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93 for (int i = 0; i < fileNames.length; i++) {
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94 allFiles.append(fileNames[i]);
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95 allFiles.append(CF_HDROP_SEPARATOR); // each name is null terminated
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96 }
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97 TCHAR[] buffer = StrToTCHARs(0, allFiles.toString(), true); // there is an extra null terminator at the very end
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98 DROPFILES dropfiles;
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99 dropfiles.pFiles = DROPFILES.sizeof;
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100 dropfiles.pt.x = dropfiles.pt.y = 0;
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101 dropfiles.fNC = 0;
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102 dropfiles.fWide = OS.IsUnicode ? 1 : 0;
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103 // Allocate the memory because the caller (DropTarget) has not handed it in
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104 // The caller of this method must release the data when it is done with it.
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105 int byteCount = buffer.length * TCHAR.sizeof;
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106 auto newPtr = OS.GlobalAlloc(COM.GMEM_FIXED | COM.GMEM_ZEROINIT, DROPFILES.sizeof + byteCount);
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107 OS.MoveMemory(newPtr, &dropfiles, DROPFILES.sizeof);
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108 OS.MoveMemory(newPtr + DROPFILES.sizeof, buffer.ptr, byteCount);
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109 transferData.stgmedium = new STGMEDIUM();
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110 transferData.stgmedium.tymed = COM.TYMED_HGLOBAL;
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111 transferData.stgmedium.unionField = newPtr;
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112 transferData.stgmedium.pUnkForRelease = null;
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113 transferData.result = COM.S_OK;
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114 }
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115
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116 /**
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117 * This implementation of <code>nativeToJava</code> converts a platform specific
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118 * representation of a list of file names to a java <code>String[]</code>.
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119 * Each String in the array contains the absolute path for a single file or directory.
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120 *
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121 * @param transferData the platform specific representation of the data to be converted
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122 * @return a java <code>String[]</code> containing a list of file names if the conversion
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123 * was successful; otherwise null
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124 *
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125 * @see Transfer#javaToNative
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126 */
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127 public Object nativeToJava(TransferData transferData) {
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128 if (!isSupportedType(transferData) || transferData.pIDataObject is null) return null;
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129
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130 // get file names from IDataObject
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131 IDataObject dataObject = transferData.pIDataObject;
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132 dataObject.AddRef();
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133 FORMATETC* formatetc = new FORMATETC();
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134 formatetc.cfFormat = COM.CF_HDROP;
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135 formatetc.ptd = null;
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136 formatetc.dwAspect = COM.DVASPECT_CONTENT;
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137 formatetc.lindex = -1;
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138 formatetc.tymed = COM.TYMED_HGLOBAL;
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139 STGMEDIUM* stgmedium = new STGMEDIUM();
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140 stgmedium.tymed = COM.TYMED_HGLOBAL;
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141 transferData.result = getData(dataObject, formatetc, stgmedium);
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142 dataObject.Release();
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143 if (transferData.result !is COM.S_OK) return null;
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144 // How many files are there?
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145 int count = OS.DragQueryFile(stgmedium.unionField, 0xFFFFFFFF, null, 0);
212
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146 String[] fileNames = new String[](count);
135
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147 for (int i = 0; i < count; i++) {
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148 // How long is the name ?
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149 int size = OS.DragQueryFile(stgmedium.unionField, i, null, 0) + 1;
138
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150 TCHAR[] lpszFile = NewTCHARs(0, size);
135
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151 // Get file name and append it to string
138
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152 OS.DragQueryFile(stgmedium.unionField, i, lpszFile.ptr, size);
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153 fileNames[i] = TCHARzToStr(lpszFile.ptr);
135
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154 }
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155 OS.DragFinish(stgmedium.unionField); // frees data associated with HDROP data
138
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156 return new ArrayWrapperString2(fileNames);
135
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157 }
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158
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159 protected int[] getTypeIds(){
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160 return [CF_HDROPID];
135
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161 }
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162
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163 protected String[] getTypeNames(){
138
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164 return [CF_HDROP];
135
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165 }
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166 bool checkFile(Object object) {
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167 String[] strings;
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168 if( auto strs = cast(ArrayWrapperString2)object ){
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169 strings = strs.array;
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170 }
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171 if (!strings) return false;
135
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172 for (int i = 0; i < strings.length; i++) {
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173 if (strings[i] is null || strings[i].length is 0) return false;
135
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174 }
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175 return true;
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176 }
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177
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178 protected bool validate(Object object) {
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179 return checkFile(object);
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180 }
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181 }