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14 lines
254 B
Dart
14 lines
254 B
Dart
4 years ago
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abstract class StringValidator {
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bool isValid(String value);
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}
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class NonEmptyStringValidator implements StringValidator {
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@override
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bool isValid(String value) {
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if (value == null) {
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return false;
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}
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return value.isNotEmpty;
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}
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}
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