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ProGuardCORE is a free library to read, analyze, modify, and write Java class files.

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/*
 * ProGuardCORE -- library to process Java bytecode.
 *
 * Copyright (c) 2002-2022 Guardsquare NV
 *
 * 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 proguard.analysis.cpa.defaults;

import java.util.HashMap;

/**
 * This {@link MapAbstractState} represents a map to {@link LatticeAbstractState}s with the semilattice operators lifted to the map.
 *
 * @author Dmitry Ivanov
 */
public class MapAbstractState>
    extends HashMap
    implements LatticeAbstractState>
{

    public MapAbstractState()
    {
        super();
    }


    public MapAbstractState(int initialCapacity)
    {
        super(initialCapacity);
    }

    // implementations for LatticeAbstractState

    @Override
    public MapAbstractState join(MapAbstractState abstractState)
    {
        if (this == abstractState)
        {
            return this;
        }
        MapAbstractState joinResult = new MapAbstractState<>();
        joinResult.putAll(this);
        joinResult.putAll(abstractState);
        // compute the join for the domain intersection
        forEach((keyL, valueL) -> joinResult.computeIfPresent(keyL, (keyR, valueR) -> valueL.join(valueR)));
        if (equals(joinResult))
        {
            return this;
        }
        if (abstractState.equals(joinResult))
        {
            return abstractState;
        }
        return joinResult;
    }

    @Override
    public boolean isLessOrEqual(MapAbstractState abstractState)
    {
        if (!abstractState.keySet().containsAll(keySet()))
        {
            return false;
        }
        return entrySet().stream()
                         .allMatch(entry -> entry.getValue()
                                                 .isLessOrEqual(abstractState.get(entry.getKey())));
    }

    @Override
    public MapAbstractState copy()
    {
        MapAbstractState copy = new MapAbstractState<>();
        copy.putAll(this);
        return copy;
    }

}