org.rapidoid.var.impl.ValidatingVar Maven / Gradle / Ivy
/*-
* #%L
* rapidoid-commons
* %%
* Copyright (C) 2014 - 2017 Nikolche Mihajlovski and contributors
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
package org.rapidoid.var.impl;
import org.rapidoid.annotation.Authors;
import org.rapidoid.annotation.Since;
import org.rapidoid.lambda.Lmbd;
import org.rapidoid.lambda.Predicate;
import org.rapidoid.log.Log;
import org.rapidoid.var.Var;
import java.util.Set;
@Authors("Nikolche Mihajlovski")
@Since("5.2.0")
public class ValidatingVar extends DecoratorVar {
private final Predicate isValid;
private final String message;
public ValidatingVar(Var var, Predicate isValid, String message) {
super(var);
this.isValid = isValid;
this.message = message;
validate(get());
}
@Override
public Set errors() {
return super.errors();
}
@Override
protected void doSet(T value) {
var.set(value);
validate(value);
}
private boolean validate(T value) {
boolean valid;
try {
valid = Lmbd.eval(isValid, value);
} catch (Exception e) {
Log.error("Validator failed!", e);
errors().add("Invalid value!");
return false;
}
if (!valid) errors().add(message);
return valid;
}
}