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/*******************************************************************************
* Copyright (c) 2010-2017, Zoltan Ujhelyi, IncQuery Labs Ltd.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.matchers.util;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Supplier;
/**
* @author Zoltan Ujhelyi
* @since 1.7
* @noreference This class is not intended to be referenced by clients.
*/
public class PurgableCache implements ICache {
Map<Object, Object> storage = new HashMap<>();
@Override
@SuppressWarnings("unchecked")
public <T> T getValue(Object key, Class<? extends T> clazz, Supplier<T> valueProvider) {
if (storage.containsKey(key)) {
Object value = storage.get(key);
Preconditions.checkState(clazz.isInstance(value), "Cache stores for key %s a value of %s that is incompatible with the requested type %s", key, value, clazz);
return (T) value;
} else {
T value = valueProvider.get();
storage.put(key, value);
return value;
}
}
/**
* Removes all values stored in the cache
*/
public void purge() {
storage.clear();
}
}
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