/*
* Copyright 2014 Ben Manes. All Rights Reserved.
*
* 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 com.github.benmanes.caffeine.testing;
import java.util.function.Supplier;
import org.hamcrest.Description;
import org.hamcrest.Description.NullDescription;
import org.hamcrest.Matcher;
import org.hamcrest.StringDescription;
import com.google.common.base.Throwables;
/**
* Assists in implementing {@link org.hamcrest.Matcher}s.
*
* @author ben.manes@gmail.com (Ben Manes)
*/
public final class DescriptionBuilder {
private final Description description;
private boolean matches;
public DescriptionBuilder(Description description) {
this.description = (description instanceof NullDescription)
? new StringDescription()
: description;
this.matches = true;
}
public <T> DescriptionBuilder expectThat(Supplier<String> reason, T actual, Matcher<? super T> matcher) {
if (!matcher.matches(actual)) {
addError(reason.get(), actual, matcher);
}
return this;
}
public <T> DescriptionBuilder expectThat(String reason, T actual, Matcher<? super T> matcher) {
if (!matcher.matches(actual)) {
addError(reason, actual, matcher);
}
return this;
}
private <T> void addError(String reason, T actual, Matcher<? super T> matcher) {
description.appendText(reason)
.appendText("\nExpected: ")
.appendDescriptionOf(matcher)
.appendText("\n but: ");
matcher.describeMismatch(actual, description);
description.appendText("\nLocation: ")
.appendText(Throwables.getStackTraceAsString(new Exception()));
matches = false;
}
public <T> DescriptionBuilder expected(String reason) {
description.appendText(reason).appendText("\nExpected to not be reachable");
description.appendText("\nLocation: ").appendText(
Throwables.getStackTraceAsString(new Exception()));
matches = false;
return this;
}
public Description getDescription() {
return description;
}
public boolean matches() {
return matches;
}
}