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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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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 org.eclipse.jface.resource.URLImageDescriptor;
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14
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15 import org.eclipse.jface.resource.ImageDescriptor;
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16
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17 // import java.io.BufferedInputStream;
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18 // import java.io.IOException;
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19 // import java.io.InputStream;
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20 import tango.net.Uri;
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21
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22 import org.eclipse.swt.SWT;
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23 import org.eclipse.swt.SWTException;
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24 import org.eclipse.swt.graphics.Device;
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25 import org.eclipse.swt.graphics.Image;
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26 import org.eclipse.swt.graphics.ImageData;
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27 import org.eclipse.core.runtime.IStatus;
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28 import org.eclipse.core.runtime.Status;
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29 import org.eclipse.jface.util.Policy;
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30
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31 import java.lang.all;
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32 import java.io.BufferedInputStream;
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33 import java.io.InputStream;
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34
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35 /**
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36 * An ImageDescriptor that gets its information from a URL. This class is not
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37 * public API. Use ImageDescriptor#createFromURL to create a descriptor that
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38 * uses a URL.
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39 */
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40 class URLImageDescriptor : ImageDescriptor {
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41 /**
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42 * Constant for the file protocol for optimized loading
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43 */
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44 private static final String FILE_PROTOCOL = "file"; //$NON-NLS-1$
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45 private Uri url;
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46
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47 /**
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48 * Creates a new URLImageDescriptor.
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49 *
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50 * @param url
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51 * The URL to load the image from. Must be non-null.
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52 */
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53 this(Uri url) {
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54 this.url = url;
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55 }
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56
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57 /*
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58 * (non-Javadoc) Method declared on Object.
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59 */
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60 public override int opEquals(Object o) {
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61 if (!(cast(URLImageDescriptor)o )) {
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62 return false;
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63 }
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64 return (cast(URLImageDescriptor) o).url.opEquals(this.url) !is 0;
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65 }
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66
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67 /*
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68 * (non-Javadoc) Method declared on ImageDesciptor. Returns null if the
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69 * image data cannot be read.
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70 */
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71 public override ImageData getImageData() {
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72 ImageData result = null;
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73 InputStream in_ = getStream();
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74 if (in_ !is null) {
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75 scope(exit)
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76 in_.close();
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77 try {
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78 result = new ImageData(in_);
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79 } catch (SWTException e) {
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80 if (e.code !is SWT.ERROR_INVALID_IMAGE) {
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81 throw e;
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82 // fall through otherwise
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83 }
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84 }
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85 }
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86 return result;
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87 }
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88
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89 /**
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90 * Returns a stream on the image contents. Returns null if a stream could
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91 * not be opened.
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92 *
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93 * @return the stream for loading the data
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94 */
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95 protected InputStream getStream() {
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96 implMissing( __FILE__, __LINE__ );
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97 return null;
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98 //FIXME
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99 /+
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100 try {
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101 return new BufferedInputStream(url.openStream());
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102 } catch (IOException e) {
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103 return null;
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104 }
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105 +/
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106 }
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107
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108 /*
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109 * (non-Javadoc) Method declared on Object.
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110 */
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111 public override hash_t toHash() {
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112 return url.toHash();
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113 }
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114
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115 /*
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116 * (non-Javadoc) Method declared on Object.
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117 */
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118 /**
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119 * The <code>URLImageDescriptor</code> implementation of this
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120 * <code>Object</code> method returns a string representation of this
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121 * object which is suitable only for debugging.
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122 */
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123 public override String toString() {
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124 return "URLImageDescriptor(" ~ url.toString ~ ")"; //$NON-NLS-1$ //$NON-NLS-2$
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125 }
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126
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127 /**
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128 * Returns the filename for the ImageData.
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129 *
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130 * @return {@link String} or <code>null</code> if the file cannot be found
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131 */
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132 private String getFilePath() {
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133 // try {
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134 // if (JFaceActivator.getBundleContext() is null) {
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135 // if (FILE_PROTOCOL.equalsIgnoreCase(url.getProtocol()))
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136 // return new Path(url.getFile()).toOSString();
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137 // return null;
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138 // }
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139 //
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140 // URL locatedURL = FileLocator.toFileURL(url);
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141 // if (FILE_PROTOCOL.equalsIgnoreCase(locatedURL.getProtocol()))
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142 // return new Path(locatedURL.getPath()).toOSString();
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143 // return null;
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144 //
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145 // } catch (IOException e) {
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146 // Policy.logException(e);
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147 // return null;
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148 // }
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149 return null;
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150 }
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151
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152 /*
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153 * (non-Javadoc)
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154 *
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155 * @see org.eclipse.jface.resource.ImageDescriptor#createImage(bool,
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156 * org.eclipse.swt.graphics.Device)
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157 */
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158 public override Image createImage(bool returnMissingImageOnError, Device device) {
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159
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160 // Try to see if we can optimize using SWTs file based image support.
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161 String path = getFilePath();
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162 if (path is null)
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163 return super.createImage(returnMissingImageOnError, device);
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164
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165 try {
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166 return new Image(device, path);
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167 } catch (SWTException exception) {
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168 // If we fail fall back to the slower input stream method.
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169 }
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170 return super.createImage(returnMissingImageOnError, device);
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171 }
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172
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173 }