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

There is a newer version: 9.1.6

/*
 * 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.Collection;
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) {
    this(Arrays.asList(items));
  }

  /**
   * Create a set abstract state from a collection.
   *
   * @param c a collection of elements
   */
  public SetAbstractState(Collection c) {
    super(c);
  }

  // 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();
  }
}