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/*******************************************************************************
* Copyright (c) 2010-2018, Gabor Bergmann, 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.Collections;
import java.util.Iterator;
import java.util.Set;
/**
* A singleton immutable empty memory.
* @author Gabor Bergmann
* @since 2.0
*
*/
public class EmptyMemory<T> implements IMemoryView<T> {
@SuppressWarnings("rawtypes")
private static final EmptyMemory INSTANCE = new EmptyMemory();
@SuppressWarnings("unchecked")
public static <T> EmptyMemory<T> instance() {
return INSTANCE;
}
/**
* Singleton; hidden constructor
*/
private EmptyMemory() {
super();
}
@Override
public Iterator<T> iterator() {
return Collections.<T>emptySet().iterator();
}
@Override
public int getCount(T value) {
return 0;
}
@Override
public int getCountUnsafe(Object value) {
return 0;
}
@Override
public boolean containsNonZero(T value) {
return false;
}
@Override
public boolean containsNonZeroUnsafe(Object value) {
return false;
}
@Override
public int size() {
return 0;
}
@Override
public boolean isEmpty() {
return true;
}
@Override
public Set<T> distinctValues() {
return Collections.emptySet();
}
@Override
public int hashCode() {
return IMemoryView.hashCode(this);
}
@Override
public boolean equals(Object obj) {
return IMemoryView.equals(this, obj);
}
@Override
public String toString() {
return "{}";
}
}
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