LinearExpr.java

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// Copyright 2010-2024 Google LLC
// 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 com.google.ortools.modelbuilder;
 
public interface LinearExpr extends LinearArgument {
  int numElements();
 
  int getVariableIndex(int index);
 
  double getCoefficient(int index);
 
  double getOffset();
 
  static LinearExprBuilder newBuilder() {
    return new LinearExprBuilder();
  }
 
  static LinearExpr constant(double value) {
    return newBuilder().add(value).build();
  }
 
  static LinearExpr term(LinearArgument expr, double coeff) {
    return newBuilder().addTerm(expr, coeff).build();
  }
 
  static LinearExpr affine(LinearArgument expr, double coeff, double offset) {
    return newBuilder().addTerm(expr, coeff).add(offset).build();
  }
 
  static LinearExpr sum(LinearArgument[] exprs) {
    return newBuilder().addSum(exprs).build();
  }
 
  static LinearExpr weightedSum(LinearArgument[] exprs, double[] coeffs) {
    return newBuilder().addWeightedSum(exprs, coeffs).build();
  }
}