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/****************************************************************************
* Sangria *
* Copyright (C) 2014 Tavian Barnes <tavianator@tavianator.com> *
* *
* 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.tavianator.sangria.test;
import com.google.inject.CreationException;
import com.google.inject.Guice;
import com.google.inject.Module;
import com.google.inject.spi.Elements;
import org.hamcrest.Description;
import org.hamcrest.TypeSafeDiagnosingMatcher;
/**
* Matcher that checks whether a {@link Module} can be installed multiple times.
*
* @author Tavian Barnes (tavianator@tavianator.com)
* @version 1.2
* @since 1.2
*/
final class AtomicMatcher extends TypeSafeDiagnosingMatcher<Module> {
@Override
protected boolean matchesSafely(Module item, Description mismatchDescription) {
// Pass through the SPI to make sure the Module is atomic regardless of its equals() implementation
// This ensures atomicity even through Modules.override(), for example
Module copy1 = Elements.getModule(Elements.getElements(item));
Module copy2 = Elements.getModule(Elements.getElements(item));
try {
Guice.createInjector(copy1, copy2);
return true;
} catch (CreationException e) {
mismatchDescription.appendValue(e);
return false;
}
}
@Override
public void describeTo(Description description) {
description.appendText("an atomic Module");
}
}
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