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StateGuard.java
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StateGuard.java
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package nu.tengstrand.stateguard;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public abstract class StateGuard<T> implements Validatable {
private List<Validatable> validators = new ArrayList<Validatable>();
protected abstract T createValidState();
protected void addValidator(Validatable validatable) {
validators.add(validatable);
}
protected void addValidators(Validatable validatable, Validatable... validatables) {
validators.add(validatable);
validators.addAll(Arrays.asList(validatables));
}
public boolean isValid() {
for (Validatable validator : validators) {
if (!validator.isValid()) {
return false;
}
}
return true;
}
public ValidationMessages validationMessages() {
ValidationMessages validationMessages = ValidationMessages.withoutMessage();
for (Validatable validator : validators) {
if (!validator.isValid()) {
validationMessages = validationMessages.mergeMessages(validator.validationMessages());
}
}
return validationMessages;
}
public T asValidState() {
if (!isValid()) {
throw new ValidateException(firstValidationMessage());
}
return createValidState();
}
private String firstValidationMessage() {
return validators.iterator().next().validationMessages().firstUnformattedMessage();
}
}