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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.Collection;
import proguard.analysis.cpa.interfaces.AbstractDomain;
import proguard.analysis.cpa.interfaces.AbstractState;
import proguard.analysis.cpa.interfaces.Precision;
import proguard.analysis.cpa.interfaces.StopOperator;

/**
 * This {@link StopOperator} returns true if the input state is less or equal than join over the
 * reached set.
 *
 * @author Dmitry Ivanov
 */
public final class StopJoinOperator implements StopOperator {
  private final AbstractDomain abstractDomain;

  /**
   * Create a join operator from the abstract domain defining the join operator.
   *
   * @param abstractDomain abstract domain
   */
  public StopJoinOperator(AbstractDomain abstractDomain) {
    this.abstractDomain = abstractDomain;
  }

  // implementations for StopOperator

  @Override
  public boolean stop(
      AbstractState abstractState,
      Collection reachedAbstractStates,
      Precision precision) {
    if (reachedAbstractStates
        .isEmpty()) // since we may have no bottom in the lattice, we have to process the case of an
    // empty reached set separately
    {
      return false;
    }
    return abstractDomain.isLessOrEqual(
        abstractState,
        reachedAbstractStates.stream()
            .map(state -> (AbstractState) state)
            .reduce(reachedAbstractStates.iterator().next(), abstractDomain::join));
  }
}