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/*****************************************************************************
* Copyright (c) 2018 Christian W. Damus and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Christian W. Damus - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.junit.utils.rules;
import java.util.function.BiFunction;
import org.eclipse.jface.preference.IPreferenceStore;
import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;
/**
* A JUnit test rule for ensuring some Eclipse Preference value for the duration
* of a test.
*/
public final class PreferenceRule<T> implements TestRule {
private final IPreferenceStore store;
private final String key;
private final T value;
private T oldValue;
private final BiFunction<IPreferenceStore, String, ? extends T> accessor;
private final TriConsumer<IPreferenceStore, String, ? super T> mutator;
/**
* Initializes me.
*
* @param store
* the preference store on which to operate
* @param key
* the preference key on which to operate
* @param the
* value to set in the preference
*/
private PreferenceRule(IPreferenceStore store, String key, T value,
BiFunction<IPreferenceStore, String, ? extends T> accessor,
TriConsumer<IPreferenceStore, String, ? super T> mutator) {
super();
this.store = store;
this.key = key;
this.value = value;
this.accessor = accessor;
this.mutator = mutator;
}
@Override
public Statement apply(Statement base, Description description) {
return new Statement() {
@Override
public void evaluate() throws Throwable {
setPreference(store, key);
try {
base.evaluate();
} finally {
restorePreference(store, key);
}
}
};
}
protected void setPreference(IPreferenceStore store, String key) {
oldValue = accessor.apply(store, key);
mutator.accept(store, key, value);
}
protected void restorePreference(IPreferenceStore store, String key) {
mutator.accept(store, key, oldValue);
}
/**
* Create a boolean-valued preference rule.
*
* @param store
* the preference store
* @param key
* the preference key
* @param value
* the value to set for the duration of the test
* @return the preference rule
*/
public static final PreferenceRule<Boolean> create(IPreferenceStore store, String key, boolean value) {
return new PreferenceRule<Boolean>(store, key, value,
IPreferenceStore::getBoolean, IPreferenceStore::setValue);
}
/**
* Create a string-valued preference rule.
*
* @param store
* the preference store
* @param key
* the preference key
* @param value
* the value to set for the duration of the test
* @return the preference rule
*/
public static final PreferenceRule<String> create(IPreferenceStore store, String key, String value) {
return new PreferenceRule<String>(store, key, value,
IPreferenceStore::getString, IPreferenceStore::setValue);
}
/**
* Create an integer-valued preference rule.
*
* @param store
* the preference store
* @param key
* the preference key
* @param value
* the value to set for the duration of the test
* @return the preference rule
*/
public static final PreferenceRule<Integer> create(IPreferenceStore store, String key, int value) {
return new PreferenceRule<Integer>(store, key, value,
IPreferenceStore::getInt, IPreferenceStore::setValue);
}
//
// Nested types
//
@FunctionalInterface
private interface TriConsumer<T, U, V> {
void accept(T t, U u, V v);
}
}
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