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

There is a newer version: 9.1.7

/*
 * 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.Arrays;
import java.util.HashSet;

/**
 * This {@link SetAbstractState} represents a set with the subset ordering.
 *
 * @author Dmitry Ivanov
 */
public class SetAbstractState
    extends HashSet
    implements LatticeAbstractState>
{

    public static SetAbstractState bottom = new SetAbstractState();

    /**
     * Create a set abstract state from its elements.
     *
     * @param items an array of elements
     */
    public SetAbstractState(T... items)
    {
        addAll(Arrays.asList(items));
    }

    // implementations for LatticeAbstractState

    @Override
    public SetAbstractState join(SetAbstractState abstractState)
    {
        SetAbstractState result = abstractState.copy();
        result.addAll(this);
        return result.isLessOrEqual(this)
               ? this
               : result.isLessOrEqual(abstractState)
                 ? abstractState
                 : result;
    }

    @Override
    public boolean isLessOrEqual(SetAbstractState abstractState)
    {
        return abstractState.containsAll(this);
    }

    // implementations for AbstractState

    @Override
    public SetAbstractState copy()
    {
        return (SetAbstractState) super.clone();
    }
}