/*
 *  JavaSMT is an API wrapper for a collection of SMT solvers.
 *  This file is part of JavaSMT.
 *
 *  Copyright (C) 2007-2015  Dirk Beyer
 *  All rights reserved.
 *
 *  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 org.sosy_lab.solver.api;

import com.google.common.base.Optional;

import org.sosy_lab.common.rationals.Rational;
import org.sosy_lab.solver.Model;
import org.sosy_lab.solver.SolverException;

/**
 * Interface for optimization modulo SMT.
 */
public interface OptEnvironment extends BasicProverEnvironment<Void>, AutoCloseable {

  /**
   * Add constraint to the context.
   */
  void addConstraint(BooleanFormula constraint);

  /**
   * Add the maximization <code>objective</code>.
   *
   * <b>Note: {@code push/pop} may be used for switching objectives</b>
   *
   * @return Objective handle, to be used for retrieving the value.
   */
  int maximize(Formula objective);

  /**
   * Add minimization <code>objective</code>.
   *
   * <b>Note: {@code push/pop} may be used for switching objectives</b>
   *
   * @return Objective handle, to be used for retrieving the value.
   */
  int minimize(Formula objective);

  /**
   * Optimize the objective function subject to the previously
   * imposed constraints.
   *
   * @return Status of the optimization problem.
   */
  OptStatus check() throws InterruptedException, SolverException;

  /**
   * Create backtracking point.
   */
  void push();

  /**
   * Backtrack one level.
   */
  void pop();

  /**
   * @param epsilon Value to substitute for the {@code epsilon}.
   * @return Upper approximation of the optimized value, or
   *  absent optional if the objective is unbounded.
   */
  Optional<Rational> upper(int handle, Rational epsilon);

  /**
   * @param epsilon Value to substitute for the {@code epsilon}.
   * @return Lower approximation of the optimized value, or
   *  absent optional if the objective is unbounded.
   */
  Optional<Rational> lower(int handle, Rational epsilon);

  Model getModel() throws SolverException;

  /**
   * Evaluate the formula with the previously generated model.
   * Assumes that the previous call was {@link #getModel}.
   */
  <T extends Formula> T evaluate(T f);

  /**
   * Status of the optimization problem.
   */
  enum OptStatus {
    OPT, // All good, the solution was found (may be unbounded).
    UNSAT, // SMT problem is unsatisfiable.
    UNDEF // The result is unknown.
  }

  String dump();

  @Override
  void close();
}

@@ -858,42 +858,8 @@
 al;%0A
-import org.sosy_lab.solver.Model;%0A
 impo
@@ -898,16 +898,16 @@
 eption;%0A
+
 %0A/**%0A * 
@@ -1040,106 +1040,8 @@
  %7B%0A%0A
-  /**%0A   * Add constraint to the context.%0A   */%0A  void addConstraint(BooleanFormula constraint);%0A%0A
   /*
@@ -1754,121 +1754,8 @@
 n;%0A%0A
-  /**%0A   * Create backtracking point.%0A   */%0A  void push();%0A%0A  /**%0A   * Backtrack one level.%0A   */%0A  void pop();%0A%0A
   /*
@@ -2252,52 +2252,8 @@
 );%0A%0A
-  Model getModel() throws SolverException;%0A%0A
   /*
@@ -2644,16 +2644,16 @@
 n.%0A  %7D%0A%0A
+
   String
@@ -2664,36 +2664,7 @@
 p();
-%0A%0A  @Override%0A  void close();
 %0A%7D%0A

Remove redundant methods from OptEnvironment.