File extension is in extensions list: Difference between revisions
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}</lang> |
}</lang> |
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It would be one line if not for the dot requirement. <code>FileNameExtensionFilter</code> requires that the extensions have no dots. It also requires that the extensions contain characters (i.e. not the empty string) so that test would need to be removed. |
It would be one line if not for the dot requirement. <code>FileNameExtensionFilter</code> requires that the extensions have no dots. It also requires that the extensions contain characters (i.e. not the empty string) so that test would need to be removed. |
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===Using Lambda Expressions=== |
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{{works with|Java|Current+}} |
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This version is the same as the main version only replace the definition for <code>extIsIn</code> with: |
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<lang java5>public static boolean extIsIn(String test, String... exts) { |
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int lastSlash = Math.max(test.lastIndexOf('/'), test.lastIndexOf('\\')); //whichever one they decide to use today |
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String filename = test.substring(lastSlash + 1);//+1 to get rid of the slash or move to index 0 if there's no slash |
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//end of the name if no dot, last dot index otherwise |
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int lastDot = filename.lastIndexOf('.') == -1 ? filename.length() : filename.lastIndexOf('.'); |
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String ext = filename.substring(lastDot);//everything at the last dot and after is the extension |
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Arrays.sort(exts);//sort for the binary search |
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return Arrays.binarySearch(exts, ext, String::compareToIgnoreCase) >= 0;//binarySearch returns negative numbers when it's not found |
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} |
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}</lang> |
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=={{header|jq}}== |
=={{header|jq}}== |
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