net.bytebuddy.matcher.FailSafeMatcher Maven / Gradle / Ivy
/*
* Copyright 2014 - Present Rafael Winterhalter
*
* 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.
*/
package net.bytebuddy.matcher;
import net.bytebuddy.build.HashCodeAndEqualsPlugin;
import net.bytebuddy.utility.nullability.MaybeNull;
/**
* A fail-safe matcher catches exceptions that are thrown by a delegate matcher and returns an alternative value.
*
* @param The type of the matched entity.
*/
@HashCodeAndEqualsPlugin.Enhance
public class FailSafeMatcher extends ElementMatcher.Junction.AbstractBase {
/**
* The delegate matcher that might throw an exception.
*/
private final ElementMatcher matcher;
/**
* The fallback value in case of an exception.
*/
private final boolean fallback;
/**
* Creates a new fail-safe element matcher.
*
* @param matcher The delegate matcher that might throw an exception.
* @param fallback The fallback value in case of an exception.
*/
public FailSafeMatcher(ElementMatcher matcher, boolean fallback) {
this.matcher = matcher;
this.fallback = fallback;
}
/**
* {@inheritDoc}
*/
public boolean matches(@MaybeNull T target) {
try {
return matcher.matches(target);
} catch (Exception ignored) {
return fallback;
}
}
@Override
public String toString() {
return "failSafe(try(" + matcher + ") or " + fallback + ")";
}
}