1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.actions.downloadtasks;
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3 |
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4 | import java.util.ArrayList;
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5 | import java.util.List;
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6 |
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7 | import org.openstreetmap.josm.io.XmlWriter;
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8 |
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9 | /**
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10 | * Common abstract implementation of other download tasks.
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11 | * @param <T> The downloaded data type
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12 | * @since 2322
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13 | */
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14 | public abstract class AbstractDownloadTask<T> implements DownloadTask {
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15 | private final List<Object> errorMessages;
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16 | private boolean canceled;
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17 | private boolean failed;
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18 | protected T downloadedData;
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19 |
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20 | /**
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21 | * Constructs a new {@code AbstractDownloadTask}.
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22 | */
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23 | public AbstractDownloadTask() {
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24 | errorMessages = new ArrayList<>();
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25 | }
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26 |
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27 | /**
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28 | * Determines if the download task has been canceled.
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29 | * @return {@code true} if the download task has been canceled
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30 | */
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31 | public boolean isCanceled() {
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32 | return canceled;
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33 | }
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34 |
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35 | /**
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36 | * Marks this download task as canceled.
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37 | * @param canceled {@code true} to mark this download task as canceled
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38 | */
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39 | public void setCanceled(boolean canceled) {
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40 | this.canceled = canceled;
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41 | }
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42 |
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43 | /**
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44 | * Determines if the download task has failed.
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45 | * @return {@code true} if the download task has failed
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46 | */
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47 | public boolean isFailed() {
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48 | return failed;
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49 | }
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50 |
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51 | /**
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52 | * Marks this download task as failed.
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53 | * @param failed {@code true} to mark this download task as failed
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54 | */
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55 | public void setFailed(boolean failed) {
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56 | this.failed = failed;
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57 | }
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58 |
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59 | protected final void rememberErrorMessage(String message) {
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60 | errorMessages.add(message);
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61 | }
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62 |
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63 | protected final void rememberException(Exception exception) {
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64 | errorMessages.add(exception);
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65 | }
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66 |
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67 | protected final void rememberDownloadedData(T data) {
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68 | this.downloadedData = data;
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69 | }
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70 |
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71 | /**
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72 | * Replies the downloaded data.
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73 | * @return The downloaded data.
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74 | */
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75 | public final T getDownloadedData() {
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76 | return downloadedData;
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77 | }
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78 |
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79 | @Override
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80 | public List<Object> getErrorObjects() {
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81 | return errorMessages;
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82 | }
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83 |
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84 | @Override
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85 | public String acceptsDocumentationSummary() {
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86 | StringBuilder buff = new StringBuilder(128)
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87 | .append("<tr><td>")
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88 | .append(getTitle())
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89 | .append(":</td><td>");
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90 | String[] patterns = getPatterns();
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91 | if (patterns.length > 0) {
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92 | buff.append("<ul>");
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93 | for (String pattern: patterns) {
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94 | buff.append("<li>")
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95 | .append(XmlWriter.encode(pattern))
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96 | .append("</li>");
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97 | }
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98 | buff.append("</ul>");
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99 | }
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100 | buff.append("</td></tr>");
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101 | return buff.toString();
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102 | }
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103 |
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104 | /**
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105 | * Determines if the given URL is accepted by {@link #getPatterns}.
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106 | * Can be overridden for more complex checking logic.
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107 | * @param url URL to donwload
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108 | * @return {@code true} if this URL is accepted
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109 | */
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110 | public boolean acceptsUrl(String url) {
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111 | if (url == null)
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112 | return false;
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113 | for (String p: getPatterns()) {
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114 | if (url.matches(p)) {
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115 | return true;
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116 | }
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117 | }
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118 | return false;
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119 | }
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120 |
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121 | /**
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122 | * Check / decide if the task is safe for remotecontrol.
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123 | *
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124 | * Keep in mind that a potential attacker has full control over the content
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125 | * of the file that will be downloaded.
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126 | * If it is possible to run arbitrary code or write to the local file
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127 | * system, then the task is (obviously) not save for remote execution.
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128 | *
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129 | * The default value is false = unsafe. Override in a subclass to
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130 | * allow running the task via remotecontol.
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131 | *
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132 | * @return true if it is safe to download and open any file of the
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133 | * corresponding format, false otherwise
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134 | */
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135 | public boolean isSafeForRemotecontrolRequests() {
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136 | return false;
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137 | }
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138 |
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139 | @Override
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140 | public boolean acceptsUrl(String url, boolean isRemotecontrol) {
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141 | if (isRemotecontrol && !isSafeForRemotecontrolRequests())
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142 | return false;
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143 | return acceptsUrl(url);
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144 | }
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145 |
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146 | // Default name to keep old plugins compatible
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147 | @Override
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148 | public String getTitle() {
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149 | return getClass().getName();
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150 | }
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151 |
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152 | @Override
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153 | public String toString() {
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154 | return this.getTitle();
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155 | }
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156 |
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157 | // Default pattern to keep old plugins compatible
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158 | @Override
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159 | public String[] getPatterns() {
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160 | return new String[]{};
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161 | }
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162 | }
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