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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.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* A partial and read-only Map implementation, mapping elements to multiplicities backed by an {@link IMemoryView}.
*
* <p> Not implemented: write methods.
*
* <p> Inefficiently implemented: {@link #containsValue(Object)}, {@link #values()}, {@link #entrySet()}.
*
* @author Gabor Bergmann
* @since 2.0
*/
public class MemoryViewBackedMapView<T> implements Map<T, Integer> {
private static final String READ_ONLY = "Read only";
private final IMemoryView<T> wrapped;
/**
* @param wrapped a memory view whose contents are to be exposed as an element-to-integer map.
*/
protected MemoryViewBackedMapView(IMemoryView<T> wrapped) {
super();
this.wrapped = wrapped;
}
@Override
public int size() {
return wrapped.size();
}
@Override
public boolean isEmpty() {
return wrapped.isEmpty();
}
@Override
public boolean containsKey(Object key) {
return wrapped.containsNonZeroUnsafe(key);
}
@Override
public boolean containsValue(Object value) {
if (value instanceof Integer) {
for (Entry<T, Integer> entry : wrapped.entriesWithMultiplicities()) {
if (entry.getValue().equals(value)) return true;
}
}
return false;
}
@Override
public Integer put(T key, Integer value) {
throw new UnsupportedOperationException(READ_ONLY);
}
@Override
public Integer get(Object key) {
int count = wrapped.getCountUnsafe(key);
if (count == 0) return null; else return count;
}
@Override
public Integer remove(Object key) {
throw new UnsupportedOperationException(READ_ONLY);
}
@Override
public void putAll(Map<? extends T, ? extends Integer> m) {
throw new UnsupportedOperationException(READ_ONLY);
}
@Override
public void clear() {
throw new UnsupportedOperationException(READ_ONLY);
}
@Override
public Set<T> keySet() {
return wrapped.distinctValues();
}
@Override
public Collection<Integer> values() {
Collection<Integer> result = new ArrayList<>();
wrapped.forEachEntryWithMultiplicities((value, count) -> result.add(count));
return result;
}
@Override
public Set<Entry<T, Integer>> entrySet() {
Set<Entry<T, Integer>> result = new HashSet<>();
for (Entry<T, Integer> entry : wrapped.entriesWithMultiplicities()) {
result.add(entry);
}
return result;
}
@Override
public String toString() {
return wrapped.toString();
}
}
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